system design description for an tank farm primary
TRANSCRIPT
RPP-15121 Rev. 4
SYSTEM DESIGN DESCRIPTION FOR AW TANK FARM VENTILATION TANK
PRIMARY SYSTEM
RPP-15121 Rev. 4
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ABSTRACT
This system design description of the AW Tank Farm Ventilation Tank Primary system is
intended to be a living compendium of design requirements, design bases, and system
descriptions. The system design description includes references to relevant procedures,
drawings, calculations, and supporting documents. It is written to the outline provided in
DOE-STD-3024-2011, Content of System Design Descriptions. All section headings from
DOE-STD-3024-2011 are included. If no information is available or relevant for a section
heading, the heading is included as a place holder, and the statement “information not readily
available” is inserted. If the information becomes available or required at a later time, it will be
included to the extent possible.
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CONTENTS
1.0 INTRODUCTION ........................................................................................................... 1-1 1.1 SYSTEM IDENTIFICATION ............................................................................. 1-1
1.2 LIMITATIONS OF THIS SYSTEM DESIGN DESCRIPTION ........................ 1-1 1.3 OWNERSHIP OF THIS SYSTEM DESIGN DESCRIPTION ........................... 1-2 1.4 DEFINITIONS/GLOSSARY .............................................................................. 1-2 1.5 ACRONYMS ....................................................................................................... 1-5
2.0 GENERAL OVERVIEW ................................................................................................. 2-1
2.1 SYSTEM FUNCTIONS/SAFETY FUNCTIONS ............................................... 2-1 2.2 SYSTEM CLASSIFICATION ............................................................................ 2-1
2.3 BASIC OPERATIONAL OVERVIEW .............................................................. 2-2
3.0 REQUIREMENTS AND BASES.................................................................................... 3-1 3.1 REQUIREMENTS ............................................................................................... 3-1 3.2 BASES ................................................................................................................. 3-5
3.3 REFERENCES .................................................................................................... 3-6 3.4 GENERAL REQUIREMENTS ........................................................................... 3-6
3.4.1 System Functional Requirements ............................................................ 3-6 3.4.2 Subsystems and Major Components ........................................................ 3-9 3.4.3 Boundaries and Interfaces ...................................................................... 3-12
3.4.4 Codes, Standards, and Regulations ........................................................ 3-12 3.4.5 Operability ............................................................................................. 3-14
3.4.6 Performance Criteria .............................................................................. 3-15
3.5 SPECIFIC REQUIREMENTS........................................................................... 3-18
3.5.1 Radiation and Other Hazards ................................................................. 3-18 3.5.2 As Low As Reasonably Achievable (ALARA) ..................................... 3-18
3.5.3 Nuclear Criticality Safety ...................................................................... 3-19 3.5.4 Industrial Hazards .................................................................................. 3-19 3.5.5 Operating Environment and Natural Phenomena .................................. 3-20
3.5.6 Human Interface Requirements ............................................................. 3-21 3.5.7 Specific Commitments ........................................................................... 3-21
3.6 ENGINEERING DISCIPLINARY REQUIREMENTS .................................... 3-22 3.6.1 Civil and Structural ................................................................................ 3-22
3.6.2 Mechanical and Materials ...................................................................... 3-22 3.6.3 Chemical and Process ............................................................................ 3-22
3.6.4 Electrical Power ..................................................................................... 3-22 3.6.5 Instrumentation and Control .................................................................. 3-23 3.6.6 Computer Hardware and Software......................................................... 3-25 3.6.7 Fire Protection ........................................................................................ 3-26
3.7 TESTING AND MAINTENANCE REQUIREMENTS ................................... 3-26
3.7.1 Testability .............................................................................................. 3-26 3.7.2 TSR-Required Surveillances .................................................................. 3-27 3.7.3 Non-TSR Inspections and Testing ......................................................... 3-27
3.7.4 Maintenance ........................................................................................... 3-29
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3.8 OTHER REQUIREMENTS .............................................................................. 3-31
3.8.1 Security and Special Nuclear Material Protection ................................. 3-31 3.8.2 Special Installation Requirements .......................................................... 3-31
3.8.3 Reliability, Availability, and Preferred Failure Modes .......................... 3-31 3.8.4 Quality Assurance .................................................................................. 3-32 3.8.5 Miscellaneous Requirements ................................................................. 3-32
4.0 SYSTEM DESCRIPTION ............................................................................................... 4-1 4.1 CONFIGURATION INFORMATION ................................................................ 4-1
4.1.1 Description of System, Subsystems, and Major Components ................. 4-1 4.1.2 Boundaries and Interfaces ...................................................................... 4-12 4.1.3 Physical Layout and Location ................................................................ 4-16 4.1.4 Principles of Operation .......................................................................... 4-17 4.1.5 System Reliability Features ................................................................... 4-18
4.1.6 System Control Features ........................................................................ 4-19
4.2 OPERATIONS ................................................................................................... 4-20 4.2.1 Initial Configuration (Prestartup) ........................................................... 4-20
4.2.2 System Startup ....................................................................................... 4-20 4.2.3 Normal Operations ................................................................................. 4-21 4.2.4 Off-Normal Operations .......................................................................... 4-21
4.2.5 System Shutdown................................................................................... 4-21 4.2.6 Safety Management Programs and Administrative Controls................. 4-22
4.3 TESTING AND MAINTENANCE ................................................................... 4-22 4.3.1 Temporary Configurations ..................................................................... 4-22 4.3.2 TSR-Required Surveillances .................................................................. 4-22
4.3.3 Non-TSR Inspections and Testing ......................................................... 4-22
4.3.4 Maintenance ........................................................................................... 4-23 4.4 SUPPLEMENTAL INFORMATION ............................................................... 4-26
5.0 REFERENCES ................................................................................................................ 5-1
APPENDICES
A SOURCE DOCUMENTS ................................................................................................ A-i
B SYSTEM DRAWINGS AND LISTS .............................................................................. B-i
C SYSTEM PROCEDURES ............................................................................................... C-i
D SYSTEM HISTORY ...................................................................................................... D-i
E AW TANK FARM VTP SYSTEM FAN CURVE ......................................................... E-i
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FIGURES
Figure 1. AW Tank Farm Ventilation Tank Primary System Flow Diagram. ............................ 2-4
Figure 2. AW Tank Farm Inlet Air-Control Station. .................................................................. 4-3
Figure 3. AW Tank Farm Ventilation Tank Primary System Exhaust Train. ............................ 4-7
Figure 4. AW Tank Farm Ventilation Tank Primary Exhaust Stacks. ..................................... 4-10
Figure 5. AW Tank Farm Ventilation Tank Primary System Boundary Drawing. .................. 4-15
Figure 6. Aerial View of the AW Tank Farm. .......................................................................... 4-16
Figure 7. Aerial View of the AW Tank Farm Central Exhaust Station. ................................... 4-17
TABLES
Table 1. Summary of AW Tank Farm VTP System Requirements. (2 sheets) ......................... 3-4
Table 2. WAC 246-247 Codes, Standards, and Regulations (2 sheets) ................................... 3-16
Table 3. Summary of Environmental Conditions for the AW Tank Farm Site. ....................... 3-21
Table 4. AW Ventilation Tank Primary System Ductwork Materials Specifications. ............... 4-4
Table 5. AW Tank Farm Waste Tank Riser Identification for VTP Interface. ........................ 4-16
Table 6. ANSI/HPS N13.1 Maintenance, Calibration and Field Check. .................................. 4-24
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1.0 INTRODUCTION
1.1 SYSTEM IDENTIFICATION
This system design description (SDD) addresses the Ventilation Tank Primary (VTP) system for
the AW Tank Farm double-shell tanks (DST). The six DSTs in the AW Tank Farm are
ventilated by a common exhaust system. The following interfacing systems are not covered by
this SDD:
Waste Storage Tank (WST) System
- RPP-15131, System Design Description for AW Tank Farm Double-Shell Tank
Waste Storage System
Electrical Distribution System (EDS)
- RPP-15144, System Design Description of Electrical Distribution System for AW
Tank Farm
Waste Transfer (WT) System
- RPP-15137, System Design Description for 200 Area Double-Shell Tank Waste
Transfer System
Raw Water (RW) System
- RPP-15131
Ventilation Tank Annulus (VTA) System
- RPP-15120, System Design Description for AW Tank Farm Ventilation Tank
Annulus System
A simplified system diagram for the AW Tank Farm VTP system is shown in Figure 1. This
ventilation system is comprised of two exhauster trains [A train (stack 296-A-46) and B train
(stack 296-A-47)] designed to be operated simultaneously or independently. Current plans are
for the operation of one train while the other is in standby.
The old AW Tank Farm VTP system described in Revision 2 of this document has been
decommissioned and removed. System boundaries are identified on Figure 5 in Chapter 4.0.
1.2 LIMITATIONS OF THIS SYSTEM DESIGN DESCRIPTION
The SDD is a central coordinating link among the engineering design documents, the facility
safety basis, and the implementing procedures. The SDD is a compilation of information
intended primarily for use by facility operation, maintenance, and technical support personnel.
This SDD is a part of the Tank Farm Safety Basis and shall be kept current in accordance with
10 CFR 830.3, Nuclear Safety Management-Definitions, and the Office of River Protection
(ORP) approved Tank Farm Unreviewed Safety Question (USQ) Procedures. A USQ evaluation
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shall be performed on any changes to this Documented Safety Analysis (DSA) supporting
document prior to release.
The SDD is formatted to be consistent with DOE-STD-3024-2011, Content of System Design
Descriptions, and is based on the best available information, including interviews with
knowledgeable personnel. It necessarily relies on historic information. Where information was
not available or was judged too difficult or impossible to recover or recreate, the following
statement is included in the standard format as a placeholder: (Information not readily
available.) If a future user of the SDD discovers, recovers, or recreates the missing information,
that user should forward that information to the SDD owner for incorporation.
This SDD includes all structures, systems, and/or components (SSCs) for the system that are
actually installed in the field, whether or not they are or were ever in operation. Designed or
planned facility modifications and additions for on-going projects were not included in the SDD.
The intent is to update or replace this SDD with new project information as part of the project
turnover to Operations personnel for beneficial use.
1.3 OWNERSHIP OF THIS SYSTEM DESIGN DESCRIPTION
The owner of this document is the Responsible Engineer for the system described herein who has
been formally assigned responsibility by the Engineering Management of the Tank Farm
Contractor. Any changes to this SDD document shall be approved by the assigned Responsible
Engineer.
1.4 DEFINITIONS/GLOSSARY
As Low As Reasonably Achievable (ALARA). The philosophy of making every reasonable
effort to maintain exposures to radiation as low as reasonably achievable. (WAC 246-247,
Radiation Protection – Air Emissions)
As Low As Reasonably Achievable Control Technology (ALARACT). The use of
radionuclide emission as low as reasonably achievable control technology that achieves emission
levels that are consistent with the philosophy of ALARA. (WAC 246-247)
Best Available Radionuclide Control Technology (BARCT). The use of the best available
radionuclide control technology that will result in a radionuclide emission limitation based on the
maximum degree of reduction for radionuclides from any proposed newly constructed or
significantly modified emission units that is achievable. (WAC 246-247)
Computerized History and Maintenance Planning Software (CHAMPS). The corrective and
preventive maintenance system used to control and coordinate all maintenance activities on the
Hanford Site tank farms. CHAMPS is a commercial off-the-shelf computerized maintenance
management system used in several U.S. Department of Energy (DOE) sites as well as many
other international commercial and government facilities.
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Confinement. Engineered barriers (e.g., ventilation systems) designed to prevent or minimize
the spread of radioactive and other hazardous materials contained within a nuclear facility or
within the normal or off-normal facility effluents.
Confinement Ventilation. In a facility that contains radioactive or other hazardous materials,
negative pressure is maintained by a ventilation system. A controlled, continuous airflow pattern
is thus maintained from the environment into the facility and out through a filtered exhaust
system that traps any entrained radioactive particulate.
Continuous Air Monitor (CAM). An instrument that monitors the radioactivity level in the
exhaust air stream. A small vacuum pump draws a representative sample of the exhaust air
stream through the CAM detection chamber, where particulates are captured on a filter, and the
radioactivity on the filter is measured.
Derived requirement. A requirement that is further refined from a primary source requirement
or from a higher level derived requirement, or a requirement that results from choosing a specific
implementation for a system element.
Designated Stack. A radioactive air emission stack is designated in accordance with
40 CFR 61, Protection of Environment-National Emission Standards for Hazardous Air
Pollutants, Subpart H, if it has a potential to emit that could cause an off-site dose that exceeds
0.1 mrem/yr., and it is non-designated if it does not have that potential. These stacks also are
referred to as major and minor stacks, respectively.
Double-Shell Tank (DST). A tank designed for storage of the highly radioactive and hazardous
waste produced at the Hanford Site. The primary tank shell contains the waste and is surrounded
by a secondary shell to provide waste containment if the primary shell develops a leak.
FF-01. The DOE Hanford Site Radioactive Air Emissions License FF-01.
Flammable Gas. Primarily hydrogen and ammonia gas that may be released from the tank
waste into the tank headspace. See RPP-6664, The Chemistry of Flammable Gas Generation, for
more details.
Fugitive Emissions. Radioactive air emissions that do not and could not reasonably pass
through a stack, vent, or other functionally equivalent structure and that are not feasible to
directly measure and quantify.
Hanford Site. A 1518 km2 (586 mi
2) nuclear processing site located in south-central
Washington State and operated by the DOE. The current primary mission of the Hanford Site is
environmental restoration and remediation.
Headspace. The vapor-containing portion of a waste tank from the top of the waste surface to
the top of the tank dome.
High-Efficiency Particulate Air (HEPA) Filters. A throwaway, extended-media dry type filter
with a rigid casing enclosing the full depth of the pleats. The filter shall exhibit a minimum
efficiency of 99.97% when tested with an aerosol of essentially monodispersed 0.3 micrometer
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diameter test aerosol particles. (Quoted from ASME AG-1, Code on Nuclear Air and Gas
Treatment, Section FC-1130.)
Lower Flammability Limit (LFL). The minimum flammable gas concentration at which
deflagration could occur.
Major stack/minor stack. See definition for designated stack.
Programmable Logic Controller (PLC). A monitoring and control device capable of
providing signal processing, data acquisition, and alarming and interlocking functions.
Record Sampler. A device for measuring radioactive particulate in gaseous effluents. A small
vacuum pump draws a representative sample of the exhaust air stream through a small filter,
which traps particulate. The filter can be removed periodically and analyzed for radioactive
content.
Safety Basis. The DSA and hazard controls that provide reasonable assurance that a DOE
nuclear facility can be operated safely in a manner that adequately protects workers, the public,
and the environment. (10 CFR 830.3) The tank farms Safety Basis is documented in RPP-
13033, Tank Farms Documented Safety Analysis.
Seal Pot. An engineered feature of the condensate collection subsystem that prevents vapor
from the tank headspace from bypassing the high-efficiency particulate air filters through the
condensate drain lines. Condensate drains into the seal pot below the liquid level in the seal pot.
The liquid seals the drain lines to air flow.
Toxic Best Available Control Technology (T-BACT). The use of the best available control
technology for toxins, that will result in an emission limitation based on the maximum degree of
reduction for each air pollutant emitted from, or that results from, any new or modified stationary
source that the permitting authority, on a case-by-case basis and taking into account energy,
environmental, and economic impacts and other costs, determines is achievable for such source
or modification, through application of production processes and available methods, systems,
and techniques for control of each such pollutant. This applies to each toxic air pollutant
discharged or mixture of toxic air pollutant, taking into account the potency quantity and toxicity
of each toxic air pollutant or mixture of toxic air pollutants discharged (WAC-173-460, Controls
for New Sources of Toxic Air Pollutants, and WAC 173-400, General Regulations for Air
Pollution Sources).
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1.5 ACRONYMS
ABB Asea Brown Boveri
AC administrative control
acfm actual cubic feet per minute
ACGIH American Conference of Government Industrial Hygienists
ALARA as low as reasonably achievable
ALARACT as low as reasonably achievable control technology
ANSI American National Standards Institute
AOP Air Operating Permit
ASIL Acceptable Source Impact Level
ASME American Society of Mechanical Engineers
ASTM American Society for Testing and Materials
BARCT best available radionuclide control technology
CAM continuous air monitor
cfm cubic feet per minute
CFR Code of Federal Regulations
CHAMPS Computerized History and Maintenance Planning Software
CPM counts per minute
DCS Distributed Control System
DID defense-in-depth
DOE U.S. Department of Energy
dP differential pressure
DPM disintegrations per minute
DSA Documented Safety Analysis
DST double-shell tank
EDS Electrical Distribution System
ENV environmental (requirement)
GEN general (requirement)
GRE gas release event
GS General Service
HDCS Hanford Document Control System
HEPA high-efficiency particulate air (filter)
HMI human machine interface
HPS Health Physics Society
HVAC heating, ventilation, and air conditioning
I/O input/output
LCO limiting condition for operation
LFL lower flammability limit
MC Mission Critical (requirement)
MCS Monitoring and Control System
MOV motor-operated valve
mrem millirem
NCPM nominal counts per minute
NOC Notice of Construction
ORP Office of River Protection
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OSD Operating Specifications Document
P&ID piping & instrumentation diagram
PLC programmable logic controller
PM/S preventive maintenance/surveillance
rem roentgen equivalent man
RW Raw Water
SAC specific administrative control
SC Safety Class
scfm standard cubic feet per minute
SDD System Design Description
SS Safety Significant
SSC structure, system, and/or component
STP standard temperature and pressure
TAP toxic air pollutant
T-BACT Toxic Best Available Control Technology
TFMCS Tank Farm Monitoring and Control System
TSR technical safety requirement
USQ unreviewed safety question
VFD variable frequency drive
VI vendor information
VTA Ventilation Tank Annulus
VTP ventilation tank primary
WAC Washington Administrative Code
WDOH Washington State Department of Health
WST Waste Storage Tank
WT Waste Transfer
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2.0 GENERAL OVERVIEW
2.1 SYSTEM FUNCTIONS/SAFETY FUNCTIONS
The main functions of the AW Tank Farm VTP are as follows.
Safety Functions
Provide ventilation to ensure the concentration of flammable gases from operations
induced gas release events (GRE) are maintained below the lower flammability limit
(LFL) in the DST headspace. (HNF-SD-WM-TSR-006, Tank Farms Technical Safety
Requirements)
Provide a layer of defense-in-depth (DID) against a steady-state flammable gas
deflagration in a DST. (RPP-13033, Tank Farms Documented Safety Analysis, Table
3.3.2.3.2-2)
Environmental Functions
Maintain the primary tank headspace pressure negative with respect to atmospheric
pressure to confine potential airborne radioactive particulates.
Remove entrained moisture from the exhaust air stream and prevent condensation by
heating the exhaust air stream to protect HEPA filters.
Maintain DST primary exhaust gaseous discharge within limits.
Monitor radiological and non-radiological air emissions to verify that emissions are
within allowable limits.
Process Functions
Remove heat to maintain the DSTs within applicable temperature limits.
2.2 SYSTEM CLASSIFICATION
The AW Tank Farm VTP system is currently classified as “Important to Safety” and is a DID
safety feature against a steady-state flammable gas deflagration in a DST and provides protection
during an operations induced GRE.
The DOE, ORP provided direction to elevate the safety importance of maintaining active
primary ventilation at all times (see letter 11-AMD-054, Contract Number DE-AC27-
08RV14800 – Transmittal of Contract Modification 094 and Request for Proposal to Upgrade
the Double-Shell Tank Primary Ventilation Systems to Safety-Significant, dated March 1, 2011).
This letter directed that the DST VTP systems be designated as safety significant (SS) and that a
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gap analysis be performed to identify differences between the functional/performance
requirements of the SS DST VTP systems to perform their safety function and the existing
system designs. RPP-49949, Safety Design Strategy for the Safety-Significant DST Primary
Tank Ventilation Systems Upgrade Project, supports implementation of DOE-STD-1189-2008,
Integration of Safety into the Design Process, for the Safety Significant DST Primary Tank
Ventilation Systems Upgrade Project, which implements the ORP direction that designates the
existing, general service (GS) DST VTP systems as SS. RPP-RPT-49447, Safety-Significant
DST Primary Tank Ventilation Systems – Functions and Requirements Evaluation Document,
provides the system evaluations of the DST VTP systems, including the results of the gap
analysis, and identifies planned improvements that are required to enable the existing DST VTP
systems to perform their safety functions.
2.3 BASIC OPERATIONAL OVERVIEW
The six DSTs in the AW Tank Farm are ventilated by a common exhaust system. All of the
DSTs contain hazardous and radioactive waste that is harmful to the environment and to human
health.
Flammable gas is generated in the primary tank by chemical reactions and radiological affects
and is released into the DST headspace either gradually in a steady state fashion or rapidly in a
GRE. The VTP system maintains consistent flow through the primary headspace and controls
the concentration of flammable gas that accumulates in the headspace. The VTP system will
also purge the headspace to remove flammable gas following a GRE.
Radioactive decay heat can cause increasing tank waste temperatures. Ventilation airflow
through the tank headspace removes some of this decay heat through convective and evaporative
cooling of the tank waste.
The VTP system also serves as a means of waste confinement by physical barriers and
confinement ventilation. Physical barriers, such as ductwork and housings, confine
contaminated gases within the system boundaries. HEPA filters extract radioactive particulate
from the exhaust air stream. The fan provides confinement ventilation by maintaining a negative
pressure on the tanks with respect to the outside atmosphere. This maintains a controlled,
continuous airflow pattern from the environment into the tank and then out through the exhaust
filter system, thus preventing fugitive emissions.
Air enters the DST through the inlet air-control stations and through infiltration pathways such as
process pits. The inlet air-control stations for each tank contain a prefilter and a HEPA filter.
The HEPA filter prevents the release of radioactive particulate in the event of a positive pressure
in the waste tank. A vacuum relief valve, installed on 241-AW-104 and 241-AW-106, prevents
excessive negative pressure in the tank headspace.
The air then flows through the DST headspace and out through an exhaust duct connected to the
DST. The air outlet ducts from all the DSTs join in a header that is connected to two redundant
and parallel de-entrainers and then to two redundant and parallel exhaust trains. Each exhaust
train consists of a glycol heater, a prefilter, two stages of HEPA filters, an exhaust fan with
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variable frequency drive (VFD), exhaust stack, stack monitoring system, seal pot, programmable
logic controller (PLC), electrical distribution system and inlet and outlet isolation valves.
Under normal conditions, one exhaust-train unit operates while the other unit is in a standby
mode. Under normal conditions, operation of the exhaust trains is periodically switched from
one unit to the other to balance wear, allow for change of filters or accommodate required
maintenance and inspection (ANSI/HPS N13.1, Sampling and Monitoring Releases of Airborne
Radioactive Substances from the Stacks and Ducts of Nuclear Facilities) of equipment. When or
if required, high flow mode may be achieved by operating both exhaust trains for an extended
period of time. Special supervisory authorization is required in order to operate in high flow
mode. See RPP-12722, Software Requirements Specification for AN/AW Farm HVAC
Exhausters, for more details.
Gases exiting through the exhaust stack are sampled and analyzed by a continuous air monitor
(CAM). The CAM monitors the air stream to ensure that the levels of radionuclides released to
the atmosphere are below acceptable levels, and it provides rapid indication of increasing levels
of radiation. A composite record sample system also continuously withdraws a sample from the
exhaust air to provide gross measurement of the radioactive particulate discharged to the
environment over time. A simplified flow diagram of the VTP system is shown in Figure 1.
RP
P-1
5121 R
ev. 4
Rev
. 3
D
2-4
Figure 1. AW Tank Farm Ventilation Tank Primary System Flow Diagram.
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3.0 REQUIREMENTS AND BASES
In this section, all the requirements imposed on the VTP system are identified, as well as the
bases for those requirements and a brief summary of how the requirements are met. Engineering
design requirements, functional and operability requirements, programmatic requirements, and
testing and maintenance requirements are included. Basis information is provided from the
source documentation when available. The source documentation for the bases of many of the
requirements is incomplete or unavailable. The intent of this document is not to recreate these
bases where they are incomplete, but to compile existing information on the bases.
3.1 REQUIREMENTS
System requirements in this section build on and logically support the system functions. The
requirements in this section are assigned classifications with regard to their importance according
to the following hierarchy.
Safety Requirements
Safety classifications for SSCs are defined in DOE-STD-3009-94, Preparation Guide for
U.S. Department of Energy Nonreactor Nuclear Facility Documented Safety Analyses. These
safety classifications are then assigned to the requirements imposed on the SSCs as described in
this SDD. The specific safety classification of the AW Tank Farm VTP system is presented in
Section 2.2.
SC – Safety Class: SSCs including portions of process systems, whose preventive and
mitigative function is necessary to limit radioactive hazardous material exposure to the
public, as determined from the safety analysis. No SC SSCs or requirements are
identified for the AW Tank Farm VTP system.
SS – Safety Significant: SSCs which are not designated as SC SSCs, but whose
preventive or mitigative function is a major contributor to defense in depth and/or worker
safety as determined from the safety analysis. No SS SSCs or requirements are currently
identified for the AW Tank Farm VTP system.
Other Safety Requirements
TSR – Technical Safety Requirement: The TSRs are defined in HNF-SD-WM-TSR-
006 and identify those criteria that define the envelope within which the facility is to
be operated. They define operability criteria and operational limits for SC or SS
SSCs to mitigate or prevent postulated accident scenarios or to protect assumptions in
the accident analyses.
DID – Defense-in-Depth: DID features include safety SSCs, TSRs, and other design
and administrative features that provide multiple layers of defense to prevent or
mitigate potential hazardous conditions and postulated accidents. The DID features
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provide layers of defense against a release of hazardous materials so that no one layer
by itself, no matter how dependable, is relied upon totally. The DID philosophy in
RPP-13033 typically takes credit for programs that may implement hardware
requirements, but does not necessarily identify the specific attributes of the hardware
that are utilized as DID features. This SDD, therefore, does not identify any DID
design features or requirements that are driven by the environmental management
program. See RPP-13033, Section 3.3.2.3.2 for more details.
Environmental Requirements
ENV - Environmental:
Washington Administrative Code (WAC): The State of Washington has codified
environmental regulations applicable to nuclear facilities; the WAC is the
implementation of those regulations. The VTP system is the main discharge pathway
to the environment for all gaseous emissions from the six AW tanks and, therefore, is
subject to the requirements of WAC 173-400, WAC 173-460, WAC 173-401,
Operating Permit Regulation, and WAC 246-247.
Hanford Site Air Operating Permit (00-05-006) : The Hanford Air Operating Permit
(AOP) contains all regulatory requirements from all involved governmental agencies
including the U.S. Environmental Protection Agency, the Washington State
Department of Ecology, the Washington State Department of Health (WDOH), and
the Benton County Clean Air Authority. Attachment 2 of the AOP (FF-01) identifies
applicable requirements from the WAC and from applicable notices of construction
(NOCs) for radioactive air emissions specific to the AW Tank Farm VTP system,
including required abatement technology and all conditions on system operation.
Attachment 1 identifies requirements for non-radioactive air emissions. The AOP is
owned by the Washington Department of Ecology. The AOP identifies the AW Tank
Farm VTP stacks as discharge points “Ventilation systems for 241-AN and 241-AW
Tank Farms”.
DOE Hanford Site Radioactive Air Emission License (FF-01): The Hanford Site
Radiological Air Emission License identifies the AW Tank Farm VTP stacks as
Emission Unit IDs 855 and 856. The stacks are also commonly referred to as 296-A-
46 (A train) and 296-A-47 (B train). The emission control equipment and monitoring
requirements for radiological emissions are identical for both stacks and are detailed
in the FF-01 under the stack number.
RPP-16922, Environmental Specification Requirements: Requirements based on
compliance with federal and state regulations are identified in RPP-16922. The AW
Tank Farm VTP stacks are currently designated as major stacks (potential impact
category 1 per ANSI/HPS N13.1), based on its expected emissions, in accordance
with 40 CFR 61, Subpart H (RPP-16922, Table 2-1).
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Process Requirements
MC – Mission Critical: The mission of the tank farm facilities is to safely store mixed
radioactive and hazardous waste, to retrieve the waste, and to deliver it to the Waste
Treatment Plant. Any requirements of the ventilation system that support this mission
other than safety basis or environmental regulatory requirements are classified as MC.
RPP-SPEC-45605, Double-Shell Tank Ventilation Subsystem Specification:
Establishes the performance, design development and test requirements, and provides
references to the requisite codes and standards to be applied during the design of the
DST ventilation subsystem in support of waste storage and waste feed delivery to the
treatment facility and identifies MC requirements applicable to this new mission.
However, RPP-SPEC-45605 is intended to be the basis for new projects/installations.
It is not intended to retroactively affect previously established project design criteria
without specific direction by the program. RPP-SPEC-45605 replaced HNF-5196,
Double-Shell Tank Ventilation Subsystem Specification, which had previously
provided the DST ventilation system requirements until it was cancelled in 2005.
OSD – Operating Specifications Document: OSD’s are comprised of the specifications
that maintain processes/operations within acceptable limits to protect equipment from
damage, ensure product/service quality, increase efficiency, and prevent mission
interruption. (TFC-ENG-CHEM-P-14, Operating Specification Documents)
OSD-T-151-00007, Operating Specifications for the Double-Shell Storage Tanks:
Establishes the applicable DST pressure limits.
GEN – General: This classification includes all other requirements for this system
including contractual requirements between the DOE and the operations contractor, and
codes and standards that are required not by regulation but at the option of the DOE or its
contractor. This classification includes requirements from project documents for the
original design and installation of the tank farm, as well as requirements documented for
Project W-314, Tank Farm Restoration and Safe Operations. Project W-314 was a tank
farm upgrades project which covered installations and upgrades of equipment in several
tank farms including extensive replacements to primary DST ventilation systems in AW
tank farm. The initial or original requirements were specified in the following
documents:
ARH-CD-304, Functional Design Criteria – Additional High-Level Waste
Storage and Handling Facilities
SD-402-FDC-001, Functional Design Criteria 241-AW Ventilation Upgrade
Project B-402
WHC-SD-WM-DB-032, Design Basis for Tank Inlet Air Control Stations in the
241-AN Tank Farm
Requirements for AW VTP upgrades under W-314 project are presented in the following
documents:
RPP-15121 Rev. 4
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HNF-SD-W314-DRD-001, Preliminary Design Requirements Document for
Project W-314 Tank Farm Restorations and Safe Operations
HNF-6779, Project Development Specification for HVAC
RPP-11731, Thermal Hydraulic Analysis for 241-AW Tank Farm Primary
Ventilation System
RPP-12722, Software Requirements Specification for AN/AW Farm HVAC
Exhausters
W-314-C20, Construction Specification W-314 Phase 2 AW Tank Farm Upgrades
Operating limits are established for ventilation system components in the following
document:
RPP-11413, Ventilation System In-Service Requirements
Table 1. Summary of AW Tank Farm VTP System Requirements. (2 sheets)
Requirement Class Section
Active Ventilation
TSR
3.4.1.1 DID
ENV
DST Primary Ventilation Systems, LCO 3.4 TSR 3.4.5.1
Flammable Gas Controls for Inactive/Miscellaneous
Tanks/Facilities, SAC 5.8.3 TSR 3.5.5.1
Ignition Controls, AC 5.9.2 TSR 3.5.5.2
Tank Pressure, SR 3.4.1 TSR
3.6.5.1 ENV
LCO 3.4 Surveillance Requirement, SR 3.4.1 TSR 3.7.2.1.1
Exhaust Stream Filtration ENV 3.4.1.2
Emissions Monitoring ENV 3.4.1.3
Inlet HEPA Filters ENV 3.4.2.1
De-entrainer ENV 3.4.2.3
Exhaust Heater ENV 3.4.2.4
Exhaust Prefilter ENV 3.4.2.5
Exhaust HEPA Filters ENV 3.4.2.6
Exhaust Fan ENV 3.4.2.7
Radiological Emissions Monitoring ENV 3.4.2.8
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Table 1. Summary of AW Tank Farm VTP System Requirements. (2 sheets)
Requirement Class Section
Exhaust Ductwork and Filter Housings ENV 3.4.2.9
Hanford Site Radioactive Air Emissions License FF-01 ENV 3.4.4.1
Hanford Site Non-Radioactive Air Emissions License ENV 3.4.4.2
ALARACT Technology Standards ENV 3.4.4.3
Radioactive Air Emissions ENV 3.5.2.1
ALARACT 16.1 ENV 3.5.2.2
CAM Sample Flow Rate ENV 3.6.5.2
Record Sampler Flow Rate ENV 3.6.5.3
CAM Alarm ENV 3.6.5.4
CAM Interlock ENV 3.6.5.5
Radiological Emission Measurement System Interlock with
Exhaust Fan ENV 3.6.5.6
Exhaust Stack Flow ENV 3.6.5.7
HEPA Filter In-Place Leak Test Ports ENV 3.7.1.1
Stack Flow Rate Measurement Ports ENV 3.7.1.2
HEPA Filter In-Place Leak Testing ENV 3.7.3.1
Stack Flow Rate Measurement ENV 3.7.3.2
Process Parameters Monitoring and Trending ENV 3.7.3.3
HEPA Filter Replacement ENV 3.7.4.1
HEPA Filter dP Transmitter Calibration ENV 3.7.4.2
Emissions Monitoring/Sampling Maintenance ENV 3.7.4.3
CAM/Record Calibration ENV 3.7.4.4
Emission Measurement System Flow-Rate Adjustments and
Calibration ENV 3.7.4.5
Tank Vacuum Relief OSD 3.4.2.2
Heat Removal MC 3.4.1.4
3.2 BASES
A major function of this SDD is not only to state the engineering requirements of the system, but
also to provide the basis for those requirements. The basis explains why a requirement exists
and why it has been specified in a particular manner. Basis information is delineated in design
input information, design constraints, and intermediate outputs, such as design studies, analyses,
and calculations.
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3.3 REFERENCES
Specific references are essential to understanding and using the SDD. Reference to source
documents from which requirements and basis information have been extracted adds traceability
to the SDD and improves its credibility. To the extent that such reference documents are
available, the source documents that contain the cited requirements or the bases information are
referenced in the SDD. If the requirement or basis information is not recorded in a separate
document, the documentation no longer exists, or retrieval of such a document is not feasible, the
basis notes that a documented reference is not available.
3.4 GENERAL REQUIREMENTS
The functional and operability requirements are identified in this section, along with the bases
that are necessary for the VTP system to fulfill the system function statements of Section 2.1.
Interface requirements with adjacent systems and applicable codes and standards are also
identified in this section.
3.4.1 System Functional Requirements
The system functional requirements identified in this section directly support the system
functions identified in Section 2.1. Table 1 summarizes the safety, environmental and OSD
requirements imposed on the VTP system that is identified in this section.
3.4.1.1 Active Ventilation
Requirement: The DST primary ventilation system shall maintain the concentration of
flammable gas that accumulates in the headspace below the LFL.
Class: TSR
Basis: The DST primary ventilation system ensures the concentration of flammable gases from
an operation induced GRE are maintained below the LFL in the DST headspace. (HNF-SD-
WM-TSR-006)
Class: DID
Basis: The DST primary ventilation system provides an additional layer of DID against a
steady-state flammable gas deflagration in a DST. (RPP-13033, Table 3.3.2.3.2-2)
How Requirement is Met: Operation of the DST primary ventilation system reduces the
concentration of flammable gas that accumulates in the headspace. Limiting condition for
operation (LCO) 3.4 (HNF-SD-WM-TSR-006) requires that the active primary tank ventilation
system be operable during, and for 7 days following completion of, water additions, chemical
additions, and waste transfers into DSTs when required by administrative control (AC) 5.8.1,
“DST Induced Gas Release Event Evaluation” (see Section 3.4.5.1 ).
RPP-15121 Rev. 4
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Requirement: The system shall maintain the primary tank headspace pressure negative, with
respect to atmospheric pressure.
Class: ENV
Basis: Operation of the DST primary ventilation system prevents tank vapors from escaping the
tanks and thus releasing radionuclides to the atmosphere in excess of limits. Negative pressure
within the tank headspace maintains a controlled, continuous airflow pattern from the
environment into the tank, then out through the exhaust filter system. If the internal tank
pressure were allowed to become positive, contaminated vapor might seep out of the tank and be
released uncontrolled into the outside environment. Example causes of vapor releases include
radiolytic heat converting water to steam, by displacement of air through natural breathing of the
tank with changes in atmospheric pressure or by displacement of air from waste transfers.
(Hanford AOP)
How Requirement is Met: The ventilation system operates in conjunction with physical barriers
to form a confinement system. The fan maintains a negative pressure on the receiver tank with
respect to the outside atmosphere. Primary tank pressures are monitored daily in accordance
with TF-OR-DR-EV, EV Daily Rounds, and alarms will activate upon indication that the tank
pressures are outside their normal operational range. (H-14-020102, Ventilation Tank Primary
System (VTP) O&M System P&ID)
3.4.1.2 Exhaust Stream Filtration
Requirement: Radioactive particulates shall be removed from the exhaust air stream to meet the
emission standards defined in the regulations identified in Section 3.4.4.
Class: ENV
Basis: Emissions of radionuclides to the ambient air from DOE facilities shall not exceed those
amounts that would cause any member of the public to receive in any year an effective dose
equivalent of 10 mrem/yr. The two stages of HEPA filters, in series, are required abatement
technology, in accordance with FF-01, to maintain emissions below this limit. Refer to Section
3.4.4 for information relative to radioactive emission limits. (Hanford AOP)
How Requirement is Met: Two stages of HEPA filters, in series, are installed on each exhaust
train. These filters have a factory rated particulate removal efficiency of 99.97% for particles as
small as 0.3 m. HEPA filter life-cycle activities from design and procurement to removal and
disposal are managed at tank farms in accordance with TFC-ENG-STD-07, Ventilation System
Design Standard. HEPA filter dP and temperature operating limits are defined in RPP-11413.
(H-14-020102)
3.4.1.3 Emissions Monitoring
Requirement: Gaseous discharge through the stack shall have continuous radioactive emissions
monitoring.
Class: ENV
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Basis: Provides an indication of the amount of radioactive releases and ensures that these
releases are maintained below acceptable levels. Specific monitoring needs are required to meet
ANSI/HPS N13.1 including continuous sampling for a record of emissions and in-line, real-time
monitoring with alarm capability. This is based on the stacks potential impact category of 1.
Continuous record sample monitoring is required in accordance with FF-01. (Hanford AOP and
RPP-16922).
How Requirement is Met: Continuous operation of the CAM and record sampler installed on the
exhaust stacks provide the required monitoring capability. The emissions monitoring system
draws a representative sample stream from each operating exhaust stack and passes it through a
CAM and a record sample filter. The CAM function initiates interlocks and alarms if the
gaseous discharge exceeds operating limits for allowable radioactive releases. The record
sample filter is periodically removed and analyzed for radioactive material in accordance with
TF-OPS-006, Air Sample Filter Exchange and Inspections for Record Samplers, Stack and
Annulus CAMs, and the equipment is inspected per TF-OPS-005, Daily CAM and Record
Sampler Inspections. (H-14-020102)
Requirement: Gaseous discharge through the stack shall be monitored for non-radioactive
emissions.
Class: ENV
Basis: The DST primary ventilation system shall meet the non-radioactive airborne emission
requirements in accordance with WAC 173-400 as implemented by the Hanford AOP. Refer to
Section 3.4.4 for information relative to non-radioactive emission limits. (Hanford AOP)
How Requirement is Met: Periodic monitoring of the exhaust stack gaseous discharge is used to
ensure emissions are maintained below the limits defined in the Hanford AOP. Refer to Section
3.4.4.2 for information pertaining to compliance with this requirement.
3.4.1.4 Heat Removal
Requirement: Primary ventilation subsystems shall be capable of providing an individual tank
flow rate of 500 scfm when the mixer pumps are operating.
Class: MC
Basis: DST waste temperature can increase as a result of waste feed delivery operations and by
radioactive decay heat from the stored waste. The primary ventilation systems are needed to
remove heat to maintain the DSTs within their applicable operating temperature limits, identified
in OSD-T-151-00007, when the mixer pumps are operating in support of waste feed delivery
operations. (RPP-SPEC-45605)
How Requirement is Met: Continuous operation of the VTP system removes heat through
convection and evaporation at the waste surface. A detailed evaluation which includes
discussion of the recommended system configuration necessary to achieve 500 scfm ventilation
flow through the tank with mixer pumps operating is included in RPP-11731, Thermal Hydraulic
Evaluation for 241-AW Tank Farm Primary Ventilation System.
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3.4.2 Subsystems and Major Components
The VTP system is divided into a number of subsystems and major components, identified in
Section 4.1.1, with unique functional requirements that directly support the system functions
identified in Section 2.1. The safety, environmental, and OSD requirements that apply to
subsystems or major components of the VTP system are included in the section and are
summarized in Table 1. Refer to Section 3.1, under “Process Requirements”, for a list of
documentation that defines the design, procurement, fabrication and acceptance testing
requirements for the AW Tank Farm VTP System. RPP-7336, Requirements Verification Report
for AW Tank Farm Upgrades, documents how each of the Project W-314 development
specification requirements have been met.
3.4.2.1 Inlet HEPA Filters
Requirement: Radioactive particulate shall be confined at the inlet air control stations.
Class: ENV
Basis: This requirement is derived from the need to maintain radioactive air emissions ALARA
(see Section 3.5.2). The inlet HEPA filters reduce the potential for the unfiltered release of
radioactive particles to the environment from unexpected tank pressurization, especially during
ventilation system downtime. (WAC 246-247-130)
How Requirement is Met: HEPA filters are installed in the inlet air-control station for all six
waste tanks. These filters have a factory rated particulate removal efficiency of 99.97% for
particles as small as 0.3 m. HEPA filter life-cycle activities from design and procurement to
removal and disposal are managed at tank farms in accordance with TFC-ENG-STD-07 and
RPP-11413. (H-14-020102)
3.4.2.2 Tank Vacuum Relief
Requirement: The system shall maintain the primary tank headspace pressure –6.0 in.w.g.
Class: OSD
Basis: The low pressure limit is established to protect the primary tank pressure minimum
design allowable value of –6.0 in. w.g. which is set to prevent high stress to and possible
uplifting of the tank bottom or buckling of the primary tank wall, jeopardizing tank integrity.
(OSD-T-151-00007)
How Requirement is Met: Primary tank pressures are monitored daily in accordance with TF-
OR-DR-EV and continuously by the primary exhauster PLCs; including alarms which will
activate upon indication that the tank pressures are outside their normal operational range. As an
added level of protection, vacuum relief valves (Anderson Greenwood, 9200 series) are installed
on tanks 241-AW-104 and 241-AW-106 inlet air-control stations. These vacuum relief valves
provide independent and automatic vacuum relief for the entire 241-AW Tank Farm. The 241-
AW-104 and 241-AW-106 primary tank outlet valves are verified to be physically configured
RPP-15121 Rev. 4
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and maintained in the fully open position to ensure tank vacuum protection is available for all of
the 241-AW tanks. (H-14-020102)
3.4.2.3 De-entrainer
Requirement: Moisture particles shall be removed from the air stream prior to the HEPA filters.
Class: ENV
Basis: Waste aerosols generated within the tank headspace and entrained in the exhaust air
stream must be removed to protect downstream components. Moisture on the HEPA filters can
cause degradation of the filter media as well as premature failure from high dP. Removal of this
moisture limits the amount of moisture collecting on the filters and protects the filters from
premature failure, thus increasing the reliability of the filters to perform their function. The de-
entrainers are required abatement technology as specified in FF-01. One de-entrainer must be in
service at all times when the exhauster is in use. De-entrainer performance is based on
compliance with Table FA-4200-1 of ASME AG-1, Code on Nuclear Air and Gas Treatment.
(Hanford AOP)
How Requirement is Met: Two de-entrainers with 99% removal efficiency for particles size 5 to
10 m are installed upstream of the exhaust trains, each with 100% system capacity. The system
is operated with one de-entrainer valved in and the other on standby. (W-314-P50, Procurement
Specification W-314 Phase 2 AW Tank Farm Moisture Separator Primary Ventilation System)
3.4.2.4 Exhaust Heater
Requirement: The relative humidity of the exhaust air shall be maintained below 70% along the
entire filter train.
Class: ENV
Basis: Condensation on the cooler surfaces of the exhaust train caused by moisture in the
exhaust air stream must be mitigated to protect exhaust train components. The heater raises the
temperature and thus reduces the relative humidity of the air exhausted from the storage tank.
This prevents condensed moisture from plugging the downstream HEPA filters. Condensation
occurring on the HEPA filters can cause degradation of the filter media as well as premature
failure from high dP. The heater limits the amount of condensation collecting on the filters and
protects the filters from premature failure, thus increasing the reliability of the filters to perform
their function. The heaters are required abatement technology, as specified in FF-01, and
differential temperature monitoring is required, per RPP-16922, in lieu of relative humidity
monitoring. The heater on each exhaust train must be in service at all times when the exhauster
is in use. ANSI/ASME N509, Nuclear Power Plant Air Cleaning Units and Components,
establishes the 70% relative humidity requirement. (Hanford AOP)
How Requirement is Met: A liquid to stainless steel air heating coil or heat exchanger,
controlled by a PLC, is used to control the heater. A temperature switch is installed at the outlet
of the heater to thermostatically control the outlet air temperature. Temperature elements are
installed before and after the heat exchanger that resides within the airstream. The heat
RPP-15121 Rev. 4
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exchanger is a glycol to air unit. The glycol is heated outside of the airstream by an electrical
immersion element that is thermostatically controlled. The heat exchangers outlet air
temperature is controlled to approximately 20F above the temperature of the air entering the
heat exchanger. This reduces the relative humidity to ≤ 70% to reduce condensation on the
potentially cooler surfaces of the HEPA filters. The exhauster will initiate an alarm at a heat
exchanger differential air temperature outside of its normal operating temperature range. (H-14-
020102 and RPP-16977, W314 DST Primary Exhauster System Supporting Calculations)
3.4.2.5 Exhaust Prefilter
Requirement: Large particulates shall be removed prior to the primary filtration components.
Class: ENV
Basis: The prefilter protects the HEPA filters from premature loading caused by larger
particulate. The prefilter is required abatement technology in accordance with FF-01. (Hanford
AOP)
How Requirement is Met: A single stage of prefilters is installed in each filter train immediately
upstream of the HEPA filters. (H-14-020102)
3.4.2.6 Exhaust HEPA Filters
Requirement: Radioactive particulates shall be removed from the exhaust air stream to meet the
emission standards defined in the regulations identified in Section 3.4.4.
Class: ENV
Basis: Two stages of HEPA filtration are required abatement technology in accordance with FF-
01. Refer to Section 3.4.1.2 for basis information.
How Requirement is Met: Refer to Section 3.4.1.2 for compliance information.
3.4.2.7 Exhaust Fan
Requirement: The AW Tank Farm VTP System shall include an exhaust fan.
Class: ENV
Basis: The exhaust fan is required abatement technology in accordance with FF-01. Refer to
Section 3.4.1.1 for additional basis information.
How Requirement is Met: Refer to Section 3.4.1.1 for compliance information.
3.4.2.8 Radiological Emissions Monitoring System
Requirement: Gaseous discharge through the stack shall have continuous emissions monitoring.
Class: ENV
RPP-15121 Rev. 4
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Basis: Refer to Section 3.4.1.3 for basis information.
How Requirement is Met: Refer to Section 3.4.1.3 for compliance information.
3.4.2.9 Exhaust Ductwork and Filter Housings
Requirement: The ductwork between the de-entrainer and heater, along with the filter housings
shall be insulated.
Class: ENV
Basis: Condensation on the cooler surfaces of the exhaust train must be mitigated to protect
exhaust train components as directed by FF-01. (Hanford AOP)
How Requirement is Met: The ductwork routing between the system de-entrainers and heaters,
including the filter housings, is insulated as illustrated on the system P&ID. (H-14-020102)
3.4.3 Boundaries and Interfaces
The VTP system interfaces with the following systems.
WST System
EDS
Monitoring and Control System (MCS)
WT System
RW System
The specific boundary definitions for these systems and the boundary drawing are included in
Section 4.1.2. Electrical power requirements are identified in Section 3.6.4. No other interfacing
requirements are imposed on the VTP system.
3.4.4 Codes, Standards, and Regulations
This section identifies codes, standards, and regulations that currently apply to the VTP system
or that were in effect at the time of construction. RPP-SPEC-45605 establishes the performance
requirements and provides references to the requisite codes and standards to be applied during
the design of the DST ventilation subsystem that support the first phase of waste feed delivery to
the waste treatment plant. TFC-ENG-STD-07 identifies the codes and standards to be used for
ventilation system design and procurement when modifying existing ventilation systems.
3.4.4.1 Hanford Site Radioactive Air Emissions License FF-01
Requirement: The system shall meet the regulatory requirements and radionuclide air emission
limits (2.6 mrem per year) contained in FF-01.
Class: ENV
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Basis: FF-01 contains the regulatory requirements (WAC 246-247) from WDOH. (Hanford
AOP)
How Requirement is Met: The required abatement technologies per FF-01 are installed in the
AW Tank Farm VTP system exhaust trains. This abatement technology includes a de-entrainer,
heater, prefilter, two stages of HEPA filtration and an exhaust fan. (H-14-020102)
3.4.4.2 Hanford Site Non-Radioactive Air Emissions License
Requirement: Visible emissions from each stack shall not exceed five (5) percent.
Class: ENV
Basis: Hanford AOP contains the regulatory requirements from Washington Department of
Ecology. (Hanford AOP)
How Requirement is Met: Compliance and monitoring for this requirement is met by Tier 3
Visible Emissions Survey requirements of the Hanford AOP, Section 2.1, which states “Maintain
abatement control technology as required in Attachment 2 for that particular emission unit”. The
required abatement technologies, per FF-01, are installed in the AW Tank Farm VTP system
exhaust trains (see 3.4.4.1 ) demonstrating compliance with this visible emissions requirement.
Requirement: Primary tank ventilation exhauster systems shall not exceed 4,000 cfm (at
standard temperature and pressure).
Class: ENV
Basis: Hanford AOP contains the regulatory requirements from Washington Department of
Ecology. (Hanford AOP)
How Requirement is Met: Compliance of this system flow requirement is demonstrated by daily
monitoring of the system stack flow and temperature in accordance with TF-OR-DR-EV.
Requirement: All Toxic Air Pollutants (TAPs), as shown in Table 2 of Approval Order
DE05NWP-001, Rev 1, Approval of Non-Radioactive Air Emissions Notice of Construction
(NOC) for Operation of New Ventilation Systems in AN and AW Tank Farms, shall be below
their respective Acceptable Source Impact Level (ASIL) or Screening Level of Table 1 of
Approval Order DE05NWP-001, Rev 1.
Class: ENV
Basis: Hanford AOP contains the regulatory requirements from Washington Department of
Ecology. (Hanford AOP)
How Requirement is Met: Compliance and monitoring for this requirement is met by operating
the exhauster systems in accordance with Toxic Best Available Control Technology (T-BACT)
emission controls for the project which includes maintaining stack flow ≤ 4000 scfm with
moisture de-entrainment, pre-heater and HEPA filtration. (H-14-020102)
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Requirement: Emissions of ammonia shall not exceed 0.22 pounds per hour from either primary
tank ventilation exhauster system. The term ‘either exhauster system’ shall mean each individual
primary tank ventilation exhauster system within the 241-AW Tank Farm, where an exhauster
system may be operated in single-train or dual-train modes.
Class: ENV
Basis: Hanford AOP contains the regulatory requirements from Washington Department of
Ecology. (Hanford AOP)
How Requirement is Met: Bi-annual assessment of ammonia stack emissions per TF-OPS-IHT-
004, Preparation and Field Use of iTx Multi-Gas Monitor, demonstrate compliance with this
requirement.
3.4.4.3 ALARACT Technology Standards
Requirement: All existing emission units (including the AW Tank Farm VTP system) and
nonsignificant modifications shall utilize ALARACT (WAC 246-247-040).
Class: ENV
Basis: The ALARACT philosophy provides greater assurance that the system is capable of
meeting the emission standards set forth in WAC 246-247-040. The ALARACT demonstration
and the emission unit design and construction must meet, as applicable, the technology standards
given that the AW Tank Farm VTP is designated a Major emission unit (the unit's potential-to-
emit exceeds 0.1 mrem/yr total effective dose equivalent to the maximally exposed individual).
(RPP-16922)
How Requirement is Met: Table 2 identifies the codes, standards and regulations, as required by
WAC 246-247-130, that currently apply to the AW Tank Farm VTP system. RPP-20278,
Project W-314, 241-AN and 241-AW Primary Ventilation Systems ASME AG-1 Code and WAC
246-247 Technology Standards Compliance Matrix, identifies compliance data for this
requirement. PNNL-10938, Evaluation of the Eberline AMS-3A and AMS-4 Beta Continuous Air
Monitors, and RPP-RPT-26393, High Temperature AMS-4 CAM ANSI N42.18 Qualification Test
Report, test the CAM against the criteria set forth in ANSI/IEEE N42.18, Specification and
Performance of On-Site Instrumentation for Continuously Monitoring Radioactivity in Effluents.
The technology standards to which the system was built are identified, when available, in this
SDD. A complete list of the standards required at the time of construction can be found in RPP-
7336. The intent of Table 2 is to provide a baseline that the current system can be measured
against.
3.4.5 Operability
Operability criteria, as defined by RPP-13033, are imposed on the ventilation system to provide
protection during an operation induced GRE. The TSRs (HNF-SD-WM-TSR-006) identify those
criteria that define the operating envelope within which the facility is to be operated. The TSRs
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define operability as when a system, subsystem, train, component, or device is capable of
performing its specified safety function(s) and (a) setpoints are within limits; (b) operating
parameters necessary for operability are within limits; and (c) when all necessary attendant
instrumentation, controls, electrical power, cooling or seal water, lubrication, or other auxiliary
equipment that are required for the system, subsystem, train, component, or device to perform its
safety function(s) also are capable of performing their related safety support function(s).
3.4.5.1 DST Primary Ventilation Systems, LCO 3.4
Requirement: The DST primary tank ventilation system shall be operating during, and for 7 days
following the completion of, water additions, chemical additions, and waste transfers into DSTs
when required by AC 5.8.1, “DST Induced Gas Release Event Evaluation.”
Class: TSR
Basis: Flammable gas has been identified as a hazard in tank farm facilities. One of the key
elements of the flammable gas control strategy is the use of currently installed active ventilation
systems on the primary tanks to dilute and remove flammable gases that are released from stored
waste. This LCO ensures the concentration of flammable gases from operations induced GREs
are maintained below the LFL in the DST headspace. A more detailed basis description is
provided in HNF-SD-WM-TSR-006, Section B 3.4.
How Requirement is Met: The surveillance activity that ensures that the above operability
criteria are met are verification that the headspace in the tank is < 0 in. w.g. relative to
atmospheric pressure. The frequency is prior to water additions, chemical additions, or waste
transfers; and once per 12-hour shift thereafter. See Section 3.7.2.1 for a complete description
of these surveillance activities. See LCO 3.4 for recovery actions if the system becomes
inoperable.
3.4.6 Performance Criteria
The AW Tank Farm VTP System performance criteria design and construction requirements are
included in Project W-314 design criteria documentation and the AW Tank Farm functional
design criteria. Section 3.1, Process Requirements, provides a list of the relevant design
documents.
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Table 2. WAC 246-247 Codes, Standards, and Regulations (2 sheets)
Requirement Class Basis
WAC 246-247
“Radiation Protection – Air
Emissions”
ENV Reference RPP-20278, Project W-314, 241-AN and 241-AW Primary Ventilation Systems
ASME AG-1 Code and WAC 246-247 Technology Standards Compliance Matrix for the bases.
ASME AG-1
Code on Nuclear Air and Gas
Treatment
ENV
ANSI/ASME N509
Nuclear Power Plant Air-
Cleaning Units and
Components
ENV
ANSI/ASME N510
Testing of Nuclear Air
Treatment Systems
ENV
ANSI/ASME NQA-1,
Quality Assurance Program
Requirements for Nuclear
Facilities
ENV
40 CFR 60, “Standards of
Performance for New
Stationary Sources”
Appendix A
ENV
RP
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Table 2. WAC 246-247 Codes, Standards, and Regulations (2 sheets)
Requirement Class Basis
40 CFR 61, “National
Emission Standards for
Hazardous Air Pollutants,”
Subparts H and I
ENV
ANSI/HPS N13.1 (1999)
Sampling and Monitoring
Releases of Airborne
Radioactive Substances from
the Stacks and Ducts of
Nuclear Facilities
ENV
ANSI/IEEE N42.18
Specification and Performance
of On-Site Instrumentation for
Continuously Monitoring
Radioactivity in Effluents
ENV
Notes:
The following codes and standards are recommended for guidance only in WAC 246-247 and are included here for information.
ACGIH, Industrial Ventilation, A Manual of Recommended Practice.
ANSI/ASME NQA-2, Quality Assurance Requirements for Nuclear Facilities.
DOE/EV/1830-T5, A Guide To Reducing Radiation Exposure To As Low As Reasonably Achievable (ALARA). Revised 1988 and issued as
PNL-6577 (below).
DOE-HDBK-1169-2003, Nuclear Air Cleaning Handbook.
PNL-6577, Health Physics Manual of Good Practice for Reducing Radiation Exposure to Levels that are As Low As Reasonably Achievable
(ALARA).
WHC-SA-0484-FP, A Practical Method Of Performing Cost-Benefit Analysis Of Occupational And Environmental Protective Measures.
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3.5 SPECIFIC REQUIREMENTS
Requirements that do not directly support the system functions, but that provides for worker
safety, protect the system from environmental conditions and natural events, and enhance the
ease of system operation are identified in this section.
3.5.1 Radiation and Other Hazards
RPP-13033, RPP-16922 and environmental regulations determine the specific radiological safety
and environmental requirements that must be met to comply with radiation exposure limits. The
specific requirements for radiation protection are identified in other sections and are summarized
below. See Table 1 for a summary of the safety and environmental requirements. Additional
safety features provided that go above and beyond the radiation protection specified in
RPP-13033, RPP-16922 and environmental regulations generally are referred to as ALARA and
are described in the next section.
The waste tanks have the potential to produce flammable gas. Ignition of this gas would result in
a significant release of radioactive and toxic materials. The ventilation of the tank headspace
provided by the VTP system helps maintain flammable gas concentrations below the LFL.
The VTP system is the primary discharge pathway for gaseous effluents from the waste tanks.
The potential for radioactive particulate in the exhaust air stream is mitigated by the HEPA
filters. HEPA filter efficiency testing, housing and ductwork pressure testing, and welded
ductwork are all features that ensure confinement of radioactive material. The exhaust stack is
monitored to detect any abnormal release of radiation. The confinement ventilation function of
the VTP system prevents the uncontrolled release of radioactive contaminants through fugitive
emission pathways.
3.5.2 As Low As Reasonably Achievable (ALARA)
Specific radiation exposure levels are established, and system requirements designed to meet
those exposure levels are established by safety analysis and environmental regulations.
Additional requirements are imposed on the VTP system to ensure that worker exposure to
radiation is kept ALARA. TFC-ESHQ-RP_RWP-C-03, ALARA Work Planning, establishes
ALARA program details for maintenance work planning.
3.5.2.1 Radioactive Air Emissions
Requirement: Radioactive air emissions to the environment shall be kept ALARA.
Class: ENV
Basis: Protects facility workers and the environment from undue exposure to radiation. (TFC-
ESHQ-ENV-STD-03, Air Quality – Radioactive Emissions, and WAC 246-247)
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How Requirement is Met: This requirement is met through system design features that are in
addition to required abatement controls and are described in the following sections:
Section 3.4.1.1 , Active Ventilation
Section 3.4.2.1 , Inlet HEPA Filters
Section 3.6.5.5 , CAM Interlock
3.5.2.2 ALARACT 16.1
Requirement: Maintenance work on the ventilation system components shall comply with the
provisions of ALARACT 16.1, Work on Potentially Contaminated Ventilation System
Components, in FF-01.
Class: ENV
Basis: The ALARACT demonstrations were agreed to between the WDOH, DOE, and the Tank
Farm Contractor to document environmental regulatory requirements for frequently performed
work activities conducted by DOE contractors within the tank farm facility. The applicable
sections of an ALARACT are the methods of radiological control, monitoring, and
records/documentation that will be followed when conducting an activity. ALARACT 16.1
applies to work on potentially contaminated ventilation system components, including repair or
replacement of ductwork, dampers, valves, recirculation fans, flexible boots, heaters,
instrumentation, or other ventilation system components. (Hanford AOP and TFC-ESHQ-ENV-
STD-06, Environmental Requirements Standard)
How the Requirement is Met: Environmental review of all work packages in accordance with
TFC-OPS-MAINT-C-01, Tank Operations Contractor Work Control, includes determination
that appropriate exhauster or emissions monitoring/detection requirements are identified and
implemented. Additionally, ALARACT 16.1 references other administrative documents to be
complied with during the work planning process.
3.5.3 Nuclear Criticality Safety
No requirements for nuclear criticality safety are imposed on the VTP system. Under current
operating conditions, a nuclear criticality accident is not credible in any of the DSTs at the
Hanford Site. RPP-13033, Chapter 6.0 provides a summary of the criticality safety program and
the technical basis for criticality safety at the tank farms.
3.5.4 Industrial Hazards
Industrial safety requirements, including fan shaft guard requirements, are included in system
design and construction requirement documents including HNF-6779 and RPP-7881,
Specification for a Primary Exhauster System for Waste Tank Ventilation.
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3.5.5 Operating Environment and Natural
Phenomena
3.5.5.1 Flammable Gas Controls for Inactive/Miscellaneous Tanks/Facilities, SAC 5.8.3
Requirement: Manned work activities involving inactive/miscellaneous tanks/facilities shall
require documented verification prior to the manned work activity that the steady-state
flammable gas concentration is < 100% of the LFL and the spontaneous release of flammable
gases is insufficient to achieve 100% of the LFL or ignition controls shall be implemented during
the manned work activity.
Class: TSR
Basis: This specific administrative control (SAC) protects the facility worker from a flammable
gas deflagration due to the release and accumulation of flammable gases in the ventilation
system condensate seal pots and collection tanks where the potential volume of flammable gas ≥
100% of the LFL is > 10 L. (HNF-SD-WM-TSR-006)
How Requirement is Met: The AC program is implemented in HNF-IP-1266.
3.5.5.2 Ignition Controls, AC 5.9.2
Requirement: Equipment and work activities in the tank farm facility headspace and connected
ventilation system ducting shall meet AC 5.9.2, Administrative Control Key Elements.
Class: TSR
Basis: Eliminates potential flammable gas ignition sources by establishing the basis for ignition
source control requirements and the requirements for their implementation. (HNF-SD-WM-
TSR-006)
How Requirement is Met: The AC program is implemented in HNF-IP-1266.
3.5.5.3 Natural Environment
The VTP system is designed to withstand the natural operating environment in which it is
located. The VTP system is located outside and above and below ground. It is expected to
operate continuously under all environmental conditions. Table 3 summarizes the operating
environment and natural phenomena conditions in the AW Tank Farm as described in Chapter 1
of RPP-13033.
The operating environment and natural phenomena design requirements that apply are found in
TFC-ENG-STD-02, Environmental/Seasonal Requirements for TOC Systems, Structures, and
Components; and TFC-ENG-STD-06, Design Loads for Tank Farm Facilities. RPP-7336
provides details regarding compliance to these requirements. RPP-7881 specifies environmental
requirements for design of the exhauster units. These requirements are similar to, but not exact
to those presented here and in RPP-13033; the environmental requirements and induced loads
required by the procurement specification are more conservative.
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Table 3. Summary of Environmental Conditions for the AW Tank Farm Site.
Condition Range
Ambient air temperature -33 oC to 46
oC (-27
oF to 115
oF) (extreme limits)
Relative humidity 0% to 100%
Rain 2.921 in. per month
Snow
(The site is subject to blowing and
drifting snow.)
10.2 in. max. in 24 hours
36 cm (14 in.) max. accumulation
Sleet/hail and glaze Sleet and hail account for less than 1% of frozen
precipitation. Maximum hailstone diameter is 1 cm
(3/8 in.). Glaze occurs approximately 6 days a year
Blowing dust Visibility is restricted to 6 mi or less
Solar radiation 838 Langley (from HNF-SD-GN-ER-501)
Wind 129 km/h (80 mi/h) gusts max.
Latitude 46o 34’ N
Longitude 119o 36’ W
Altitude 733 ft
Note:
Compiled from information in RPP-13033, Chapter 1.0.
3.5.6 Human Interface Requirements
Human interface requirements, including Human Machine Interface (HMI) requirements, are
included in design requirement documents including HNF-6779 and RPP-7881.
3.5.7 Specific Commitments
3.5.7.1 ALARACT Demonstrations
The ALARACT demonstrations were agreed to among the WDOH, DOE, and the Tank Farm
Contractor to document environmental regulatory requirements for frequently performed work
activities conducted by DOE contractors within the Tank Farm facility. See Section 3.5.2.2 for
more details.
3.5.7.2 Process Parameters Monitoring and Trending
The WDOH requires monitoring, trending and evaluation of system parameters to detect
changing conditions that may indicate that abatement controls are not operating as designed. See
Section 3.7.3.3 for more information.
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3.6 ENGINEERING DISCIPLINARY REQUIREMENTS
This section identifies design requirements that typically are related to particular disciplines of
engineering.
3.6.1 Civil and Structural
The general and functional AW Tank Farm VTP System civil and structural design and
construction requirements are included in Project W-314 design criteria documentation and the
AW Tank Farm functional design criteria. Section 3.1, Process Requirements, provides a list of
the relevant design documents.
The VTP system is located in an area that occasionally experiences seismic activity and strong
winds and is designed and analyzed in accordance with TFC-ENG-STD-06. Design and
construction of the system to these requirements provides assurance that the system can perform
its intended functions under the loads from natural forces. Structural requirements are met for
the inlet piping and drain piping as documented in calculations W314-P-201, HVAC Duct System
Piping Stress Analysis, and W314-P-203, Drain System Piping Stress Analysis, and for the
support slab and foundations in calculation W314-C-204, HVAC Skid & De-entrainer
Foundations Structural Analysis. The structural requirements were passed on to the exhauster
skid vendor in Procurement Specification RPP-7881, and were verified as part of definitive
design. A complete list of the standards required at the time of construction can be found in
RPP-7336. Design analysis for the air inlet stations can be found in WHC-SD-WM-DA-210,
241AW Air Intake System Analysis.
3.6.2 Mechanical and Materials
The general and functional AW Tank Farm VTP System mechanical and materials design and
construction requirements are included in Project W-314 design criteria documentation and the
AW Tank Farm functional design criteria. Section 3.1, Process Requirements, provides a list of
the relevant design documents.
3.6.3 Chemical and Process
The VTP system has no chemical or process requirements.
3.6.4 Electrical Power
The general and functional AW Tank Farm VTP System electrical power design and
construction requirements are included in Project W-314 design criteria documentation and the
AW Tank Farm functional design criteria. Section 3.1, Process Requirements, provides a list of
the relevant design documents.
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3.6.5 Instrumentation and Control
The general and functional AW Tank Farm VTP System instrumentation and control design and
construction requirements are included in Project W-314 design criteria documentation and the
AW Tank Farm functional design criteria. Section 3.1, Process Requirements, provides a list of
the relevant design documents. The instrumentation and control setpoints for alarms and
interlocks are identified on the system P&ID, H-14-020102, and the setpoint values are
calculated in RPP-15034, Project W-314 Primary Ventilation System Setpoint Determination.
3.6.5.1 Tank Pressure
Requirement: The tank dP, relative to atmospheric pressure, shall be monitored.
Class: TSR & ENV
Basis: The pressure within each tank must be monitored to allow surveillance to verify
ventilation system operability in accordance with LCO 3.4. Surveillance requirement SR 3.4.1
requires verification that the headspace in the tank is < 0 in. w.g. relative to atmospheric pressure
(See Section 3.7.2.1.1 ). Tank dP, relative to atmospheric pressure, indicates that an exhaust fan
is running and is moving air through the tank headspaces. While verification of this parameter
does not provide a direct measurement of airflow, the available airflow is considered to be
sufficient to meet the safety function when a negative pressure, relative to atmospheric pressure,
is measured in the tank. (HNF-SD-WM-TSR-006)
How Requirement is Met: Transmitters which measure the dP between the tank pressure and
atmospheric pressure are installed on each of the tanks (H-14-020102). The instrumentation
used to verify a negative pressure is calibrated in accordance with the requirements of TFC-PLN-
02, Quality Assurance Program Description.
3.6.5.2 CAM Sample Flow Rate
Requirement: An alarm shall activate upon detection of an offnormal CAM sample flow rate.
Class: ENV
Basis: Provides timely warnings that the required flow rate to the CAM is outside of required
parameters. The CAM is an environmental requirement; the set points are determined by
engineering in accordance with ANSI/HPS N13.1. (TFC-ESHQ-ENV-STD-03)
How Requirement is Met: The system includes CAM sample flow alarms as identified on the
system P&ID. (H-14-020102)
3.6.5.3 Record Sampler Flow Rate
Requirement: An alarm shall activate upon detection of an offnormal record sample flow rate.
Class: ENV
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Basis: Provides timely warning that the required flow rate to the Record Sampler is outside of
required parameters. The Record Sampler is an environmental requirement; the set points are
determined by engineering in accordance with ANSI/HPS N13.1. (TFC-ESHQ-ENV-STD-03)
How Requirement is Met: The system includes record sample flow alarms as identified on the
system P&ID. (H-14-020102)
3.6.5.4 CAM Alarm
Requirement: An alarm shall activate upon high radiation in the ventilation stack emissions.
Class: ENV
Basis: Provides timely warnings that the radionuclide content in the emissions has increased
significantly because of off-normal or upset conditions, requiring corrective actions to prevent
emissions from exceeding applicable standards. The need for the alarm is environmentally
required while set points are determined by engineering. (TFC-ESHQ-ENV-STD-03)
How Requirement is Met: The system includes CAM alarms as identified on the system P&ID.
(H-14-020102)
3.6.5.5 CAM Interlock
Requirement: The exhaust fan shall be automatically shut down when high radioactive-
particulate activity is detected by the CAM.
Class: ENV
Basis: This requirement is derived from the regulatory requirement to maintain radioactive air
emissions ALARA (see Section 3.5.2.1 ). High radiation in the exhaust stack indicates upset
conditions such as failure of the HEPA filters. Shut down of the exhaust fan is required to limit
the unfiltered release. The set-point is determined by engineering.
How Requirement is Met: A vacuum pump draws a continuous sample from the exhaust stack
and passes it through the CAM. The CAM detects beta and gamma activity in the air stream.
The CAM interlock system is operated continuously to ensure automatic shutdown of the
exhaust fan upon detection of a high radiation level. (H-14-020102)
3.6.5.6 Radiological Emission Measurement System Interlock with Exhaust Fan
Requirement: The radiological emission measurement system (Record Sampler) shall shut
down, when the exhaust fan shuts down.
Class: ENV
Basis: This requirement is derived from the requirement for accurate sampling of particulate
radionuclides in the exhaust air stream. Continued operation of the record sampler pump after
the shutdown of the exhaust fan would result in sampling of air that is not being discharged from
the VTP system and, therefore, would cause an inaccurate measurement of the gross radioactive
RPP-15121 Rev. 4
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particulate emitted from the operating ventilation system. The reverse is also true if the fans
continue to operate when the record sampler is shutdown the emissions measurement will not be
representative. The intent of continuous radiological emission measurement would be
compromised. (TFC-ESHQ-ENV-STD-05)
How Requirement is Met: The stack sampling system shuts down when the exhaust fan shuts
down. (H-14-020102)
3.6.5.7 Exhaust Stack Flow
Requirement: An alarm shall activate upon abnormal stack airflow conditions.
Class: ENV
Basis: Provides timely warnings that stack airflow requirements are out of specifications. The
need for the alarm is environmentally required while set points are determined by engineering.
How Requirement is Met: System alarms, including shutdown of exhaust fan, are activated upon
detection of abnormal stack airflows. (H-14-020102)
3.6.6 Computer Hardware and Software
The existing AW Farm Tank Farm HVAC control system was upgraded to an Asea Brown
Boveri (ABB) System 800xA control system with Process Portal HMI, non-redundant AC800M
controllers, and S800 IO modules. This system will be integrated into the Tank Farm wide
Distributed Control System (DCS) known as the Tank Farm Monitoring and Control System
(TFMCS).
Configuration for each train will reside in separate ABB System 800xA AC800M controllers,
providing independent control. The field input/output (I/O) devices will connect to the AC800M
controller with S800 I/O modules. Profibus communication modules will be used to relay I/O
signals between the AC800M and the S800 modules. Each process unit will have a dedicated
NEMA I/O enclosure located near the unit. Extended termination units will be used for
connection to S800 modules.
The 800xA HMI system utilizes a client/server architecture. The server functional applications
(Aspect and Connectivity) will be shared with the TFMCS and reside in rack-mounted redundant
servers. The client software will reside on industrial computers installed at each exhauster train.
The HMI provides the interface between the user and the control system by displaying
data/information from the controller and accepting operator commands/inputs. The on-skid HMI
allows the user to interact/control the HVAC system while remote access (i.e., without making a
radiological zone entry) is also available via any TFMCS HMI.
The original exhauster PLC, which was replaced by the ABB system described above, utilized
Citect Software controls. Validation and verification of the original exhauster software can be
found in RPP-21625, Software Validation Report for HVAC - Project W-314, and RPP-21082,
Software Configuration Management Plan for Base Operations Process Control Systems.
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3.6.7 Fire Protection
No fixed fire protection features are identified in the DSTs. The hazards in these tanks are such
that no fire protection system exists that can reasonably be expected to mitigate the event once
initiated. No fire protection requirements are related to the DST ventilation tank primary
systems (HNF-SD-WM-FHA-020, Tank Farm Fire Hazards Analysis).
3.7 TESTING AND MAINTENANCE REQUIREMENTS
3.7.1 Testability
3.7.1.1 HEPA Filter In-Place Leak Test Ports
Requirement: Capability of in-place testing of the HEPA filters shall be included in the design
as outlined in ASME AG-1, ANSI/ASME N509, and ANSI/ASME N510.
Class: ENV
Basis: HEPA filter test sections with aerosol injection and sampling ports, qualified in
accordance with ASME AG-1, ANSI/ASME N509, and ANSI/ASME N510, ensure that aerosol
mixing, flow characteristics, and sampling methods allow for accurate determination of installed
HEPA filter leak tightness and efficiency. This also allows for HEPA filter in-place leak testing
to be performed from outside the system using apparatus and devices, which are supplied as
integral parts of the test sections. This requirement is derived from the requirement for HEPA
filter in-place leak testing described in Section 3.7.3.1 .
How Requirement is Met: Both A and B exhaust trains and the inlet filters have flow test ports
or test sections before and after all HEPA filters that allow access into the air stream for filter
testing. Hanford Site Drawing H-14-020102 illustrates these test ports. The installed test
apparatus meets the specified ASME codes and standards. See Section 3.4.4 for details on code
compliance.
3.7.1.2 Stack Flow-Rate Measurement Ports
Requirement: Test ports shall be located on the exhaust stack to allow insertion of test probes
for flow-rate measurement.
Class: ENV
Basis: Location of the stack flow test ports shall meet ANSI/HPS N13.1. The need for the
sample ports is derived from the stack flow rate measurement requirement described in Section
3.7.3.2 .
How Requirement is Met: Several test ports to accommodate flow rate measurement are located
on the system stack as illustrated on H-14-020102.
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3.7.2 TSR-Required Surveillances
The purpose of the required surveillances is to confirm the availability, operability, and quality
of safety-related SSCs or to verify that specific plant conditions exist that are required to
maintain the facility’s operations within operational limits. The surveillances ensure that safety-
related SSCs will function when required or that parameters are within limits to preserve the
validity of the safety analysis and the resulting safety envelope. Operation of the facility within
the LCO associated with the VTP system is confirmed with the following required surveillances.
3.7.2.1 DST Primary Ventilation Systems, LCO 3.4
LCO 3.4 requires that the DST primary tank ventilation system be operating during, and for 7
days following the completion of, water additions, chemical additions, and waste transfers into
DSTs when required by AC 5.8.1 (HNF-SD-WM-TSR-006). The following surveillance ensures
compliance with this LCO.
3.7.2.1.1 LCO 3.2.1 Surveillance Requirement, SR 3.4.1
Requirement: The tank headspace shall be verified to be < 0 in. w.g., relative to atmospheric
pressure, prior to the water addition, chemical addition, or waste transfer; and once per 12-hour
shift thereafter.
Class: TSR
Basis: Verification of a tank headspace negative pressure provides reasonable assurance that the
DST primary tank ventilation system is operating. Active ventilation provided by the DST
primary tank ventilation system is qualitatively determined adequate to maintain the flammable
gas concentration in the tank headspace ≤ 25% of the LFL. A more detailed basis description is
provided in HNF-SD-WM-TSR-006, Section B 3.4.
How Requirement is Met: The ability of the system to perform its safety function is confirmed
prior to the water addition, chemical addition, or waste transfer; and once per 12-hour shift
thereafter through monitoring of the tank dP during operator surveillance rounds (TF-OR-DR-
EV). The instrumentation used to verify a negative pressure is calibrated in accordance with the
requirements of TFC-PLN-02.
3.7.3 Non-TSR Inspections and Testing
3.7.3.1 HEPA Filter In-Place Leak Testing
Requirement: All HEPA filters shall be aerosol tested upon installation, after each filter change
and at least annually. The penetration shall be within the limit of 0.05% by a DOE approved
challenge aerosol.
Class: ENV
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Basis: The HEPA filters function as abatement technology for effluent releases. The in-place
leak test ensures that the HEPA filters are capable of limiting radioactive releases to the
environment by verifying that the nominal particulate removal efficiency is >99.95% for
polydisperse particles as small as 0.3 m. Maintaining the specified efficiency enables the
ventilation system to meet federal, state, and DOE regulatory requirements for releases.
(Hanford AOP, TFC-ESHQ-ENV-STD-03, RPP-16922 and RPP-11413)
How Requirement is Met: The filters are entered in the CHAMPS Preventive
Maintenance/Surveillance (PM/S) system with recall frequencies for in-place leak testing to meet
the stated requirement. The concentration of challenge aerosol that is injected upstream of the
filter is compared to the measured concentration downstream of the filter to determine the
penetration of aerosol particles. Verification of the HEPA filter performance criteria is
conducted using maintenance procedure 3-VBP-156, Exhauster-Related HEPA Filter In-Place
Leak Test (Aerosol Test), in conjunction with location-specific datasheets; 3-VB-156CC,
AW241-VTP-EF-009 (A-Train) Tank Exhauster 296-A-46 HEPA Filter Aerosol Test Data
Sheets, 3-VB-156CD, AW241-VTP-EF-010 (B-Train) Tank Exhauster 296-A-47 HEPA Filter
Aerosol Test Data Sheets and 3-VB-156TW, 241-AW Tank Inlet Filter Aerosol Test Data Sheets.
The test is designed to be in accordance with the guidance in ANSI/ASME N510 and DOE-
HDBK-1169-2003. The system meets the test qualification requirements of ANSI/ASME N509,
ANSI/ASME N510 and ASME AG-1. The test demonstrates filter particulate removal
efficiency to be ≥ m at the design airflow
rate.
3.7.3.2 Stack Flow Rate Measurement
Requirement: The stack volumetric flow rate shall be measured at least annually using methods
specified in Reference Method 2 of 40 CFR 60, Appendix A.
Class: ENV
Basis: In combination with emissions measurement data, stack volumetric flow-rate
measurements provide a measurement of gross radioactive emissions. Stack flow and sampling
data, including flow-rate calculations, are required by WAC 246-247-080. (TFC-ESHQ-ENV-
STD-03, TFC-ESHQ-ENV-STD-05, WAC 246-247-080 and RPP-16922)
How Requirement is Met: Stack flow measurements are performed using procedure 3-VBP-155,
Air Flow Test for Tank Farm Stacks and Ducts, in conjunction with location specific data sheets;
3-VB-155ZC, 241-AW Exhauster Stack 296-A-46 Air Flow Test Data Sheets & 3-VB-155ZD,
241-AW Exhauster Stack 296-A-47 Air Flow Test Data Sheets.
3.7.3.3 Process Parameters Monitoring and Trending
Requirement: The following parameters shall be monitored and trended:
System exhaust flow rate
Pre-filter dP
HEPA filter1 dP
HEPA filter 2 dP
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Combined HEPA dP
241-AW-101, 102, 103, 104, 105, and 106 headspace pressure
Exhauster seal pot level
Glycol heat exchanger air dT
Glycol expansion tank level
Glycol pump pressure
De-entrainer seal pot level
CAM sample flow rate
Record sample flow rate
Exhauster PLC cabinet air temperature
De-entrainer dP
CAM radiation readings
Record sampler data
Class: ENV
Basis: The ventilation system must use ALARACT standards to minimize the spread of
radioactive materials. The WDOH requires monitoring, trending, and evaluation of these
parameters to detect changing conditions that may indicate that abatement controls are not
operating as designed. (WAC-246-247-040 and letter AIR-01-505, Air Emissions Inspection
Report Concerning the 296-P-23 Emission Unit)
How Requirement is Met: Process variable data is recorded on the daily operator round sheets,
TF-OR-DR-EV and by the exhauster PLC. CAM data are recorded on the daily health physics
technician datasheets, TF-OPS-005 and record sampler filters are removed for analysis in
accordance with TF-OPS-006. Trend sheets are generated by Tank Surveillance and Data
Acquisition. The data and trend sheets are reviewed by the Shift Manager, the first line
Radiological Control Manager, and Environmental Compliance for values that are out of
specification. The data are analyzed for adverse trends by the system engineer. See TFC-ENG-
FACSUP-P-01, Conduct of System Engineering and TFC-ENG-CHEM-D-21, Process
Engineering Waste Surveillance Data Review, for more information.
3.7.4 Maintenance
3.7.4.1 HEPA Filter Replacement
Requirement: The HEPA filters shall be replaced, typically at a filter housing radiation level of
100 mrem/h, or if the filter fails its annual (365 day) challenge test.
Class: ENV
Basis: Limits the dose rate to workers in the vicinity of the filter housings caused by
accumulated radioactive particulate on the filters. Also, prevents the need to increase
radiological controls around the exhaust trains. Filters must be maintained with a nominal
particulate removal efficiency >99.95% for polydisperse particles as small as 0.3 m. (TFC-
ESHQ-ENV-STD-03)
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How Requirement is Met: The filters are entered in the PM/S system for the annual challenge
test and the periodic filter housing radiation surveys are incorporated in scheduled Radiation
Control Technician tasks. The HEPA and prefilter housing radiation level is measured weekly as
required by TFC-ESHQ-RP_MON-P-10, Required Radiological Surveillances. The HEPA
filters typically are replaced when the measured dose rate at the filter housing reaches
100 mrem/h for ALARA purposes. HEPA filter life-cycle activities from design and
procurement to removal and disposal are managed at tank farms in accordance with TFC-ENG-
STD-07, RPP-11413 and the CHAMPS system.
3.7.4.2 HEPA Filter dP Transmitter Calibration
Requirement: The dP transmitters for the exhaust HEPA filters shall be calibrated at least
annually.
Class: ENV
Basis: Ensures accurate dP monitoring for an indication of filter loading and trending of
changing conditions (also see Section 3.7.3.3 ). (RPP-16922)
How Requirement is Met: The HEPA filter dP gauges are calibrated at least every 330 days in
accordance with 6-PCD-613, AW and AN HVAC Foundation Fieldbus Pressure Transmitters.
3.7.4.3 Emissions Monitoring During Maintenance
Requirement: The system shall provide the capability for temporary emissions monitoring
during system downtime.
Class: ENV
Basis: Responsive indication of abnormal releases must be achieved at all times, including times
when the main monitoring system is down because of maintenance, equipment replacement, or
malfunction. Records documenting periods of malfunction are required by WAC 246-247-080.
(TFC-ESHQ-ENV-STD-03 and WAC 246-247-080)
How Requirement is Met: Environmental review of all work packages, in accordance withTFC-
OPS-MAINT-C-01, includes determination that appropriate exhauster or emissions
monitoring/detection requirements are identified and implemented. Typically, the record
sampler filter paper is checked for an increase in radioactivity every 2 hours as an alternate
monitoring method when the CAM is out of service.
3.7.4.4 CAM Calibration
Requirement: The CAM shall be calibrated and maintained according to the requirements of
DOE/EH-0173T, Environmental Regulatory Guide for Radiological Effluent Monitoring and
Environmental Surveillance, before use and any time the system is subject to maintenance or
modification that might affect equipment calibration.
Class: ENV
RPP-15121 Rev. 4
3-31
Basis: Ensures accurate monitoring of radioactive emissions. Equipment calibration records are
required by WAC 246-247-080. (TFC-ESHQ-ENV-STD-03, WAC 246-247-080 and
RPP-16922)
How Requirement is Met: The calibration demonstrates that the CAM responds as required
when compared with a known standard and is performed in accordance with 6-RM-622, Perform
Functional Check for AW-Farm Primary Exhaust Stack Continuous Air Monitor.
3.7.4.5 Emission Measurement System Flow-Rate Adjustments and Calibration
Requirement: Emission measurement system sample flow instrumentation shall be inspected,
cleaned, adjusted, and calibrated to meet the requirements of ANSI/HPS N13.1, Table 5A, TFC-
ESHQ-ENV-STD-03 and TFC-ESHQ-ENV-STD-05.
Class: ENV
Basis: Achieves optimum sampling conditions for the measurement of radioactive emissions.
Equipment calibration records are required by WAC 246-247-080. (TFC-ESHQ-ENV-STD-03,
TFC-ESHQ-ENV-STD-05, WAC 246-247-080, RPP-16922 and Hanford AOP)
How Requirement is Met: Daily inspections of the record sampler are performed with the
procedure TF-OPS-005. Instructions for calibration of the CAM and record sampler vacuum
gauges and flow switches and the functional testing of the rotometers, totalizer, and timer are
contained in 6-FCD-077, Stack Sampling, Monitoring and Annulus CAM Enclosure Systems.
3.8 OTHER REQUIREMENTS
3.8.1 Security and Special Nuclear Material
Protection
No special nuclear material is located in or associated with the VTP system. The VTP system
has no security features.
3.8.2 Special Installation Requirements
There are no special installation requirements. The VTP system was installed in accordance with
standard construction practices.
3.8.3 Reliability, Availability, and Preferred Failure
Modes
With exception to redundant exhaust trains and de-entrainers there are no requirements
associated with reliability, availability and preferred failure modes.
RPP-15121 Rev. 4
3-32
3.8.4 Quality Assurance
The system quality assurance/control program is based on the safety classification of the SSC.
This SDD does not detail the quality assurance requirements enforced during past ventilation
projects, but modifications, additions, and operations of the existing VTP system shall be
evaluated in accordance with TFC-ENG-DESIGN-P-28, Ventilation System Quality Assurance
Level Determination. A graded approach is used to determine the level of quality control placed
on changes and additions to the VTP system.
3.8.5 Miscellaneous Requirements
Section is not applicable.
RPP-15121 Rev. 4
4-1
4.0 SYSTEM DESCRIPTION
4.1 CONFIGURATION INFORMATION
4.1.1 Description of System, Subsystems, and Major Components
This section describes the overall system and components. The VTP system is divided into the
subsystems and major components listed below. The system diagram is shown in Figure 1 in
Section 2.3. The VTP system includes redundant exhaust trains and de-entrainers that that each
provide for 100% system capacity. This redundancy in confinement system equipment is
required in the event of a confinement system failure or downtime for maintenance. One exhaust
train is in operation with the other in standby. This provides the assurance of a controlled,
continuous airflow pattern from the environment into the tank and then out through the exhaust
filter system.
The AW Tank Farm VTP system consists of the following subsystems:
Tank inlet air-control stations subsystem
Tank exhaust ductwork and header subsystem
De-entrainers/moisture removal subsystem
Exhaust train subsystems
Exhaust stack sampling and monitoring subsystem
Condensate collection subsystem
Major components of the above subsystems include the following:
Tank vacuum relief valves
Tank inlet and outlet butterfly valves
Various isolation valves
Prefilters
HEPA filters
Filter housings
Heaters
Exhaust fan assemblies, including motor and VFD
Stacks and process monitoring instrumentation
Heater controllers and interlocks
Exhaust system PLC.
More detailed equipment information can be found in the Tank Farm Master Equipment List in
the CHAMPS database.
4.1.1.1 Tank Inlet Air-Control Stations Subsystem
Each DST located in the AW Tank Farm is equipped with an inlet air-control station (Figure 2).
Negative pressure created by the ventilation system exhaust fan pulls outside air into the DST
tank dome space through the inlet air-control station. The inlet air-control stations are connected
RPP-15121 Rev. 4
4-2
to the tank risers by below-grade ductwork. Each inlet air-control station consists of an inlet
screen, a constant flow device, a flow relief device, a filter housing containing a prefilter and a
HEPA filter, an isolation butterfly valve, an inlet air-control station bypass valve and on 241-
AW-104 and 241-AW-106, a tank vacuum relief valve. Differential pressure instrumentation
provides local indication of dP across the HEPA filter, prefilter, and flow controller. Functional
and design requirements are provided in WHC-SD-WM-DB-032.
The Inlet Air-Control Station filter housing design includes ports to accommodate in-place
HEPA filter testing, isolation capability from tank headspace to facilitate filter replacement and
provisions for an alternate flow path into the tank headspace during filter change-out. The inlet
filter assemblies are constructed and installed in accordance with Hanford Site Drawing H-2-
85614, HEPA Filtered Inlet. No vendor information files are associated with the components of
this assembly, as stated in HNF-SD-WM-ABU-017, Acceptance of 241-AW Tank Inlet Air Filter
and Control Stations for Beneficial Use.
The constant-flow device is a mechanical passive component with a floating orifice plate that
moves up or down in response to changing pressures. Movement of this orifice plate reduces or
enlarges the opening for air flow, thus maintaining constant air flow regardless of the upstream
or downstream pressure. Because the device is passive, with no reliance on electrical power or
manual manipulation, it is a very stable and reliable component. The device operates over flow
ranges of 35 to 500 cfm, maintains air flow through the tank headspace within 10% of the set
value, allows headspace pressure to remain within the range of –0.5 to -4 in. w.g. and provides
an alternate flow path (vacuum breaker-type valve) in the event of flow device failure. See
WHC-SD-WM-ES-287, Methods of Limiting Waste Tank Vacuum Level– ETN-94-0107, and
WHC-SD-WM-TRP-234, Development and Testing of a Passively-Operated Air Flow Control
Device for more information concerning the need for better tank flow control.
Tank pressures can be adjusted by changing the orifice plate in the constant-flow device or by
changing the amount of infiltration air by adding or removing tape from the cracks around the pit
cover blocks. Increasing the area available for air flow through the orifice plate and/or through
infiltration would decrease the vacuum on the tank and decreasing the area available for air flow
would increase the vacuum. Tank pressures are not controlled by manipulation of tank inlet or
outlet butterfly valves.
The flow relief device consists of a ¼ in. thick lexan plate that covers an opening in the flow
controller assembly. This plate is sized to flex and allow flow controller bypass at a nominal
pressure of -3.7 in.w.g. This pressure is upstream of the inlet filters, so the actual tank vacuum at
which this device will actuate is slightly higher. Construction and installation of these devices
are shown in Hanford Site Drawings H-2-85614 and H-2-85608, Airflow Controller.
Verification of flow and pressure parameters is documented in test report
WHC-SD-WM-TRP-247, Test Report of Constant Air Flow Control Device for Tank Farm
Ventilation Systems.
The air inlet stations on tanks 241-AW-104 and 241-AW-106 are equipped with vacuum relief
valves (see Figure 2). The purpose of these valves is to ensure that excessive vacuum conditions
due not arise within the tanks in 241-AW Tank Farm. Placement of the vacuum relief valves on
241-AW-104 and 241-AW-106 provide protection to the entire tank farm. These tanks are
RPP-15121 Rev. 4
4-3
New Vacuum Relief
Valves
closest to the exhausters and thus excessive vacuum produced by the exhausters would be
relieved by these valves.
Figure 2. AW Tank Farm Inlet Air-Control Station.
4.1.1.2 Tank Exhaust Ductwork and Header Subsystem
Tank exhaust ductwork provides the flow path and maintains confinement of tank headspace
effluents before passing through the HEPA filters. From the inlet air-control station riser, the
ventilation air passes through the tank headspace, leaves through the exhaust riser, and enters the
tank exhaust ductwork. The exhaust ductwork is welded to the tank riser. A tank outlet butterfly
valve located in an associated ventilation instrumentation pit allows for tank isolation. The tank
outlet butterfly valves for 241-AW-104 (VTP-V-254/V-104) and 241-AW-106 (VTP-V-256/V-
106) are verified to be physically configured and maintained in the fully open position to ensure
tank vacuum protection is available for all of the 241-AW tanks. The exhaust ductwork for each
tank joins to a common exhaust header. The ventilation air passes through the header and enters
first the de-entrainers and then the exhaust filter trains. All of the exhaust ductwork and header
is below-grade, 12 in. pipe. The ductwork is of welded and flanged construction to ensure
confinement.
Ductwork entering the tank from the inlet air-control stations and the tank exhaust ductwork
before the de-entrainers was installed under Project B-120. Most of this ductwork is
underground and includes the inlet and outlet risers (excluding the spool pieces through the tank
dome) and tank outlet butterfly isolation valves (in instrumentation pits 1, 2, 3, and 4) for each of
the six waste tanks.
Existing ductwork (Pre W-314) was installed in accordance with Hanford Site Drawings H-2-
70337, HVAC/Piping Vent Piping Plan 241-AW Tank Farm; H-2-70338, HVAC/Piping Vent
Piping and Support Plan 241-AW Tanks and construction specification B-120-C7, Construction
RPP-15121 Rev. 4
4-4
Specification for the 241-AW Tank Farm Completion Project B-120. Pipe codes are detailed in
Table 4. These codes, M-40 thru M-42, are suffixed to the duct size listed on the above drawings
and on H-14-020102. Ductwork installed by W-314 was installed in accordance with W-314-
C20, W-314-P-201 and W-314-P-202, HVAC Duct/Pipe Supports Analysis. RPP-20278
provides code compliance information.
Table 4. AW Ventilation Tank Primary System Ductwork Materials Specifications.
Size Material Nominal Wall
Thickness Fittings Flanges Gaskets
4 in. thru 12
in.
Pipe Code
M40
Black steel
ASTM A135,
Grade A
0.133 in Wrought steel
buttwelding per
ANSI B16.9 and
ASTM A234, Grade
WPB, Schedule 20
150-lb steel per
ANSI B16.5, slip-
on, per
ASTM A181,
Grade 2
Neoprene,
1/8 in. thick,
55/65
durometer
14 in. and
16 in.
Pipe Code
M41
Black steel
ASTM A53,
Type S,
Grade A or B, or
ASTM A106,
Grade B
Schedule 10 Wrought steel ASTM
A234, Grade WPB,
Butt-welding per
ANSI B16.9
150-lb steel per
ANSI B16.5, slip-
on, per
ASTM A181,
Grade 1, or
ASTM A105
Neoprene,
1/8 in. thick,
55/65
durometer
12 in. and 14
in.
Pipe Code
M42
Black steel
ASTM A53,
Type S,
Grade A or B, or
ASTM A106,
Grade B
Schedule 20 Wrought steel ASTM
A234, Grade WPB,
Butt-welding per
ANSI B16.9,
Sched. 20
150 lb forged
steel per ASTM
A181, ANSI
B16.5, slip-on,
Grade 1, or
ASTM A105
Neoprene,
1/8 in. thick,
55/65
durometer
Notes:
ANSI B16.5, 1977, Steel Pipe Flanges, Flanged Valves, and Fitting
ANSI B16.9, 1978, Factory-Made Wrought Steel Butt-welding Fittings
ASTM A53-79, 1979, Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and
Seamless
ASTM A105-79, 1979, Standard Specification for Carbon Steel Forgings for Piping Applications
ASTM A106-79b, 1979, Standard Specification for Seamless Carbon Steel Pipe for High-Temperature Service
ASTM A135-73a, 1973, Standard Specification for Electric-Resistance-Welded Steel Pipe
ASTM A181-77, 1977, Standard Specification for Carbon Steel Forgings, for General-Purpose Piping
ASTM A234-79a, 1979, Standard Specification for Pipe Fittings of Wrought Carbon Steel and Alloy Steel for
Moderate and High Temperature Service
4.1.1.3 De-entrainers/Moisture Removal Subsystem
Each of the two de-entrainers servicing the VTP system has its own connection to the tank
exhaust collection header. The de-entrainers may be isolated from the exhaust header by
butterfly valves located upstream and downstream of the de-entrainers. Under normal operating
conditions, one de-entrainer is operational and the other is in standby. However, both de-
entrainers may be used in parallel if desired.
The de-entrainers are designed and constructed to meet ASME AG-1a requirements of Table
FA-4200-1. The de-entrainers protect the downstream HEPA filters from water aerosols that can
lead to HEPA filter plugging and failure. HEPA filter protection and longevity ensures
operability and extended continuous functionality.
RPP-15121 Rev. 4
4-5
The de-entrainers are located above-grade. The de-entrainers are Hayward Industrial Products,
Inc 36L-CLC Gas/Liquid Separators. These de-entrainers consist of a flow device in
combination with a wire-mesh pad that separates heavy entrained moisture particles from the air
stream. The wire mesh removes smaller moisture particles from the air. The guaranteed
performance of this system is a minimum 99% of all entrained moisture and a minimum 99% of
particles 5 to 10 m.
The exiting ductwork and each de-entrainer combines to form a common header to enter the
primary exhaust trains, which are arranged in parallel. The design of each de-entrainer includes
flushing and/or replacement of the internal mesh pad capability when necessary. The need to
provide shielding around the de-entrainers is evaluated by calculation W-314-P-200, HVAC
Duct/Demister Shielding Analysis, which concludes that no shielding is required. The ductwork
between the de-entrainers and the exhaust train heaters is insulated, as required by the Hanford
AOP (See Section 3.4.2.9 ).
Hanford Site Drawing H-14-105336, Piping AW Farm TK Exhauster Plan, details the de-entrainer
assembly with mist eliminator and wire mesh pad units as well as the flush system. VI 50316,
W-314 241-AW Phase II, presents information on the de-entrainer. See RPP-11731 for
evaluations of the removal efficiencies of the de-entrainers, RPP-7881 for procurement
requirements and RPP-20278 for code compliance documentation.
4.1.1.4 Primary Exhaust Train Subsystems
Each primary exhaust train (Figure 3) consists of an inlet motor-operated isolation valve, a
heater, a prefilter, HEPA Bank filter test sections before each HEPA filter stage, two HEPA
filters stages in series with each stage consisting of two HEPA filters, an outlet motor-operated
isolation valve, an exhaust fan and an exhaust stack equipped with stack gas monitoring
equipment. The prefilter, test sections, heater and HEPA filters are contained in a filter housing
made from stainless steel sheet metal with 2 in. of insulation on the outside surface that is
encased with an outer stainless steel sheet metal layer. No maintenance of the insulation is
required. Hanford Site Drawings H-14-105705, AW241-VTP (W-314) Equipment Schedules &
General Notes, H-14-105679, AW-241-VTP (W-314) Exhauster Train “A” Assembly, and H-14-
105693, AW-241-VTP (W-314) Exhauster Train “B” Assembly, shows details of the filter
housings, ductwork, butterfly valves, and stack. Vendor Information (VI) 50316, 241-AW
Primary Ventilation System, has information on all components within the AW VTP system and
RPP-20278 provides code compliance information.
The filter housings and ductwork provide the flow path and the confinement of tank headspace
effluents before the HEPA filters. Filter housings are fabricated and tested in accordance with
ANSI/ASME N509, ASME AG-1 and ANSI/ASME N510 specifications. Filter housing and
ductwork is seal welded and sloped to drain in a manner to entirely eliminate puddling.
Procurement specification RPP-7881 and Construction specification B-120-C7 provide details of
material types and fabrication methods.
Motor-operated isolation valves are used to automatically direct the airflow through one of the
two independent exhaust trains. The valve opens when the fan is started and closes when the fan
is stopped. This prevents backflow of air through the exhaust train that is shut down. Under
RPP-15121 Rev. 4
4-6
normal operation, one exhaust train is running and the other is on standby. The motor-operated
isolation valves are used for train switchover and train isolation for maintenance activities. The
isolation valves are used to completely isolate the filter train from the ventilation system during
filter element replacement and without interrupting continuous operations. Because the filter
housings are open during filter removal, isolating the filter train will reduce the risk of workers
being exposed to additional radiation from the DST headspace gases and allows continued
operation of the other exhaust train. Each exhaust train has an inlet valve [AW241-VTP-MOV-
352 (A-Train) and AW241-VTP-MOV-452 (B-Train)] and an outlet valve [AW241-VTP-MOV-
361 (A-Train) and AW241-VTP-MOV-461 (B-Train)].
The Glycol heat exchanger is located in the “heater plenum” upstream of the prefilter. The heat
exchanger decreases the relative humidity of the air by increasing the air temperature. The
heater reduces the opportunity for condensation to occur inside the filter housing and on the
downstream filters protecting the HEPA filters from potential plugging caused by air stream
moisture condensing on the filter media surface. HEPA filter protection and longevity ensures
operability and extended continuous functionality. The Glycol heater provides up to 24 kW of
heat to the air stream. This is accomplished by heating the glycol in a glycol expansion tank
(external to the heater plenum) with an electric immersion heater. The heated glycol is then
circulated via a recirculation pump to the heat exchanger within the heater housing. The glycol
electric heater is controlled electronically (via the PLC) with inputs from temperature sensors
located in the air stream upstream and downstream of the heat exchanger within the heater
housing. These sensors monitor the temperature of the air across the heat exchanger and adjust
the glycol electric heater to maintain the heater outlet air temperature 20 F above the heater inlet
temperature.
The heaters are sized to prevent condensation on downstream components over the air flow
conditions of 1000 cfm to 2000 cfm and 50 to 150 F measured at the entrance to the exhausters
and during outside ambient air temperatures down to -32 F. The heaters are capable of lowering
air flow relative humidity to less than 70%, and maintaining air temperature downstream of both
HEPA filters above the dew point at all times. The heaters are replaceable and designed to heat
the entire cross section of the air flow with less than 5% bypass factor. Design analysis verifying
that the heaters satisfy downstream air temperature and relative humidity requirements is found
in RPP-16977, Appendix C and RPP-20278.
RPP-15121 Rev. 4
4-7
Figure 3. AW Tank Farm Ventilation Tank Primary System Exhaust Train.
The exhaust train filtration is capable of operating over the airflow range of 500 to 3000 cfm and
withstanding temperatures up to 200F. Prefilters and HEPA filters are required abatement
controls as identified in Section 3.4.2.5 and 3.4.2.6 . The filters must be capable of filtering the
tank headspace emissions under anticipated conditions, including upstream heater effects.
HEPA filters are procured per the direction of specification HNF-S-0552, Procurement
Specification for Standard, Nuclear Grade, High Efficiency Particulate Air (HEPA) Filters (For
ASME AG-1 Section FC Compliant Filters), and the filter schedule of H-14-105705.
Specification HNF-S-0552 lists requirements specifically defined in ASME AG-1 and mandated
by WAC 246-247. The requirements are met when the HEPA filters are purchased in
accordance with HNF-S-0552.
Downstream of the heater is a single stage of prefilters. The prefilter stage includes two (2), 24”
x 24” x 2” UL Class I filters with a minimum efficiency of 30-35% in accordance with
ANSI/ASHRAE 52.1, Gravimetric and Dust-Spot Procedures for Testing Air-Cleaning Devices
Used in General Ventilation for Removing Particulate Matter. The prefilter increases the
effective life of the downstream HEPA filters by trapping larger airborne particles. The prefilter
allows for a more economical operating system, and ALARA concepts are applied through less
frequent replacement of the HEPA filters. The dP across the prefilter is measured, with local
296-A-47 (B-Train)
296-A-46 (A-Train)
De-entrainers
RPP-15121 Rev. 4
4-8
indication and remote alarm actuation, and the filter is replaced when the dP becomes high,
indicating excessive loading of the filter.
Downstream of the prefilter are two stages of nuclear-grade HEPA filters. Each stage consists of
two HEPA filters. The HEPA filters provide primary control of radioactive particulate emission
to the outside air. The HEPA filters are rated to remove particles as small as 0.3 m with an
efficiency of no less than 99.97%. The filters used in the AW Tank Farm ventilation systems
have face dimensions of 24 in. x 24 in., and are 11 ½ in. in depth. The filters are rated for a
clean filter pressure drop of 1.0 in. w.g. at 1,500 cfm and a maximum pressure drop of 10 in.
w.g. at 1,500 cfm.
To ensure proper operability, the filters are in-place leak tested on an annual basis. Test
manifolds are installed to allow injection of test aerosol upstream of each HEPA filter and
detection of downstream aerosol penetration.
The allowable leakage for the in-place leak test is different than that of the rated efficiency of a
new filter. A new filter is rated at 99.97% efficient, which is based on a penetration efficiency
test performed at the factory. In the field, a leak test is performed that determines whether there
is leakage either around or through the filter. The acceptance criteria used for the in-place
testing is 99.95% and is based on criteria from ASME AG-1 and DOE-HDBK-1169-2003, DOE
Nuclear Air Cleaning Handbook, Chapter 8.
The HEPA filter are typically replaced before the filter housing radiation level reaches 100
mrem/h, or if the filter fails its annual challenge test. This limits the dose rate to workers in the
vicinity of the filter housings caused by accumulated radioactive particulate on the filters. This
also prevents the need to increase radiological controls around the exhaust trains. The filters are
entered in the PM/S system and the periodic filter housing radiation surveys are incorporated in
scheduled radiation tasks. The HEPA and prefilter housing radiation level is measured weekly
as required by TFC-ESHQ-RP_MON-P-10.
The dP across each exhaust HEPA filter is measured, monitored, and trended by the exhauster
PLC to ensure that the filters continue to perform their particulate removal function. High dP
indicates that the filter is becoming heavily loaded with particulate, and low dP indicates that the
filter has been breached. High dP across the first HEPA filter will result in shutdown of the fan
to ensure that the HEPA filter will not fail as a result of excessive loading. Low dP across the
second HEPA filter also will result in shutdown of the fan to prevent an unfiltered release after a
breach of the HEPA filter. After leaving the last HEPA filter, the air passes through a manual
isolation valve that is used for train isolation and for maintenance activities.
Downstream of the filter housing is the centrifugal exhaust fan, manufactured by Industrial Air
Technologies Corporation, model TROH 24a, class 100, arrangement 8. Each fan is driven by a
20 Hp TEFC electric motor and Allen-Bradley PowerFlex 700 adjustable frequency AC drive
(referred to herein as a variable frequency drive (VFD)). Each fan is unique to its own particular
exhaust train. The discharge of each fan leads to its own exhaust stack. The exhaust fans have
rotating parts that, if not guarded, are exposed to contact by employees. Therefore, the fans are
equipped with shaft guards that protect the employees from the moving parts (TFC-ESHQ-S-
STD-21, Machine Guarding).
RPP-15121 Rev. 4
4-9
The exhaust fans are capable of producing 2000 scfm over its entire range of operating
conditions per RPP-7881. Each tank air inlet station is capable of being manually adjusted for an
individual tank flowrate up to 500 cfm (RPP-11731). See Drawing H-2-85614 for details of the
air inlet stations. VI-50316 lists fan/motor order specifications of 2000 scfm at 22.7 in. static
pressure with a 20 hp motor. Fan performance curves at different fan speeds and airstream
conditions (temperature and relative humidity) are included in the VI file and in Appendix E.
The high capacity (static pressure) fan was chosen to allow for simultaneous operations (open
riser, mixer pump operation, etc) to occur within 241-AW. The PLC receives feedback
information from stack volumetric air flow rate instrumentation. It compares this data to the
desired set point and signals the VFD to change the speed of the fan accordingly.
The VFD environmental operating temperature is greater than 32°F and less than 122°F and the
relative humidity is between 5% and 95%. The VFD is mounted in a conditioned NEMA 3R
enclosure with an 800 Watt heater with over-temperature switch, a 530 BTUH “Peltier” electric
cooler, a temperature indicator and an integrated enclosure fan with thermostat and interlock
rated for 160 cfm. The heat load is calculated in RPP-16977, Appendix L.
The air exits the VTP system through either 296-A-46 or 296-A-47 exhaust stack. The
10-in.-diameter stack contains a flow-indicating device consisting of a Verabar Flow Sensor with
integral RTD temperature sensor. This device ultimately provides input to the exhauster PLC.
Stack velocity and volumetric flow rate measurements are taken annually from two ports located
90 degrees apart and which are 18 in. below the sample probe assembly. The bottom of the stack
has a valved drain connection which routes rain water back to the exhauster seal pot. Figure 4
shows the stack, sample lines and radiation monitoring enclosure.
The VTP system exhaust trains are located with adequate clearance on all sides to operate and
maintain the equipment. The filter unit and fan are located to accommodate the equipment
footprint, personnel egress and required maintenance.
RPP-15121 Rev. 4
4-10
Figure 4. AW Tank Farm Ventilation Tank Primary Exhaust Stacks.
VTP Stacks
296-A-46 (A-Train)
296-A-47 (B-Train)
RPP-15121 Rev. 4
4-11
4.1.1.5 Exhaust Stack Sampling and Monitoring Subsystem
The Stack Sample system consists of two separate identical sampling probes with shrouded
nozzles on each of these probes. These probes sample the air stream as it exits the stack.
Shrouded probes allow for representative samples from the stack at varying airflow rates.
Verification of this design can be found in RPP-46436, Generic Effluent Monitoring System
Qualification 3000 CFM Exhaust Stack, AN, AW, POR126 and POR127. One probe is routed to
a record sampler. The other probe is routed to a high temperature Eberline AMS-4 CAM.1
These high temperature CAMs are rated for a maximum air stream temperature of 167° F.
Performance qualification testing for the high temperature CAM, per ANSI/IEEE N42.18, was
completed and is documented in RPP-RPT-26393, High Temperature AMS-4 CAM ANSI N42.18
Qualification Test Report.
The record sampler consists of a sample filter, flow and pressure instrumentation, a flow
regulator to maintain a constant flow rate, and a sample pump. Particulates entrained in the
exhaust air stream are continuously collected on the sample filter. Periodic removal of the filter
and laboratory analysis provides a measurement of gross radioactive particulate emission.
The CAM provides continuous and responsive radioactive emission monitoring of the exhaust air
stream. This portion of the subsystem also contains flow and pressure instrumentation, a flow
control valve to maintain a constant flow rate, and a sample pump. A filter paper in the sampled
air stream removes radioactive particulates, which then are sensed by the CAM detector head.
The CAM provides alarm capability to indicate high radiation in the exhaust air stream and an
input into the CAM interlock system to shut down the exhaust fan on detection of high radiation.
The CAM sample data is stored in the PLC located on each exhauster. A CAM alarm is indicated
on the AW241-VTP-CP-110/111 HMI computer screen and on the MCS system computer
screen. These alarms and can be acknowledged from each computer screen.
System alarms and interlocks, including setpoints, associated with the Stack Sampling and
Monitoring Subsystem are identified on the system P&ID (H-14-020102).
4.1.1.6 Condensate Collection System
A condensate collection system is in place at the AW Tank Farm. The AW VTP System
includes seal pots that act as an engineered confinement barrier to ensure that no ventilation air is
allowed to bypass any of the system components; primarily the HEPA filters which are required
abatement controls. The system includes a seal pot on each exhaust train and a single seal pot
that supports operation of the de-entrainers. Condensate and moisture removed from the air
passing through the VTP system is routed (gravity drained) to seal pots by a network of 1-in. and
2-in. drain lines. The seal pots allow drainage while sealing this path to air passage. To ensure
that sufficient liquid is present in the seal pot to prevent bypass of a component, the liquid level
is constantly monitored by the exhaust train PLC with information sent to the MCS system.
Refer to the system P&ID (H-14-020102) for alarm and interlock setpoints associated with the
Condensate Collection System.
1 Eberline AMS-4 is a trademark of ThermoEberline, Santa Fe, New Mexico.
RPP-15121 Rev. 4
4-12
Each de-entrainer has three 1-in. drain lines which combine into a single 2-in drain line. This 2-
in drain line routes to seal pot AW241-VTP-SP-170. The seal pot has a 3-in. line that returns
condensate to Tank 241-AW-106. The de-entrainers can be flushed with water when necessary.
The flush water drains through the drain lines described above.
Drain lines also remove condensate that may form in the heater plenum, Pre-Filter plenum, Test
Section 1, HEPA Filter 1 plenum, Test Section 2, HEPA Filter 2 plenum and the exhaust fan of
the primary exhaust trains. These drain lines consist of 1 -in lines that drain to each of the
primary exhaust train seal pots (AW241-VTP-SP-380/480). These seal pots each use a 1-in. line
that feeds into the de-entrainers seal pot, AW241-VTP-SP-170. The overflow from the de-
entrainer seal pot returns moisture to Tank 241-AW-106, Riser 017.
The aboveground condensate drain lines are heat-traced and insulated, to preclude freezing,
while the below grade condensate lines are double contained. All the condensate lines are
gravity drained back through a seal pot to Tank 241-AW-106.
4.1.1.7 CAM and HEPA Filter Differential-Pressure Interlocks
The CAM high-radiation interlock shuts the exhaust fan down on the detection of high radiation
levels exiting the stack, thus terminating an unfiltered release. High radiation levels are defined
as those resulting in >3,000 counts/min in the sampled air stream, as detected by the CAM
detector head.
A high-pressure drop across the HEPA filters indicates excessive filter loading, which could
ultimately result in degradation of performance caused by moisture loading or filter failure
caused by moisture and particulate loading. A low-pressure drop across the HEPA filters
indicates the possibility of a breach in the filters. Additionally, a plugged condition in the first
HEPA filter may be indicated as a low-pressure drop across the second HEPA filter as a result of
the reduction in air flow. Differential-pressure transmitters monitor the pressure drop across the
HEPA filters and sends an input to a PLC (AW241-VTP-YYC-350/450). The PLC then
provides the interlock function to shut down the fan and provide local and remote alarms for high
pressure, low pressure, and instrument failure conditions. Reaching a high dP setpoint of 5.80
in. w.g. across the first HEPA filter or a low dP setpoint of 0.20 in. w.g. across the second
HEPA filter will initiate the interlock and shuts down the exhauster. PLC hardware and software
allow for ease of future system modifications. The modular design of the PLC allows various
configurations of inputs and outputs, and the software provides flexibility in alarm setpoints,
signal processing, and data acquisition.
4.1.2 Boundaries and Interfaces
Figure 5 identifies the boundaries with systems that interface with the VTP system as described
below.
4.1.2.1 Waste Storage Tank System
The ventilation system interfaces with risers located on each of the DSTs in the AW Tank Farm.
The inlet air-control station for each tank is connected to the tank inlet air riser. The exhaust-air
RPP-15121 Rev. 4
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ductwork is connected the tank outlet riser. The specific risers are different for each tank and are
identified in Table 5. All risers are 12 in. in diameter. The boundary is defined as the point
where the VTP ductwork is welded to the tank riser.
4.1.2.2 Electrical Distribution System
Electrical power to the ventilation system is supplied by the AW Tank Farm electrical
distribution system. Power for the AW ventilation system is supplied from AW241-EDS-DP-
130 Breakers 1 and 4 at a voltage of 480 VAC. The boundary is located at the exhausters 100
amp transfer switch (AW241-VTP-MTS-350/450) on the supply side. Low voltage (120VAC) is
supplied by transformers located on the exhausters.
Electrical power is supplied to the VTP system to meet the load requirements. The components
of the VTP system that require 480 V, 3-phase electrical power are as follows:
20 hp motor (M-009) and VFD for fan AW241-VTP-EF-009
20 hp motor (M-010) and VFD for fan AW241-VTP-EF-010
Heater AW241-VTP-HTR-372, 24 kW
Heater AW241-VTP-HTR-472, 24 kW
The components of the VTP system that require 120 V, single-phase electrical power are as
follows:
Motor-operated valves
Programmable logic controller (PLC)
Stack sampling and monitoring equipment
Environmental control devices (e.g., fans, heaters, lights, heat trace)
Heater controllers
Glycol pump
Currently, RPP-13033 does not identify the electrical distribution system as an SS supporting
SSC, and, therefore, emergency power is not required. If the ventilation system is not operating
due to an interruption of electrical power from the electrical power distribution system, actions
can be taken to restore electrical power (e.g., bypass routing or temporary generators) before
tank conditions reach a level of concern. Provisions exist on the exhausters to connect a portable
generator to allow normal exhauster operations. Normal Power is provided by the EDS as
identified on Figure 5. Refer to RPP-15144 for more specific information pertaining to the AW
Tank Farm EDS.
4.1.2.3 Condensate Drain System
Condensed moisture removed from the air by the de-entrainers and de-entrainer flush water is
collected in seal pot AW241-VTP-SP-170. Condensation in the exhaust trains is collected in
seal pots AW241-VTP-SP-380/480. Seal pot AW241-VTP-SP-170 returns the moisture to Tank
241-AW-106 by a single 3-in. drain line. The return line is connected to riser AW241-WST-
RISER-017 on Tank 241-AW-106. The boundary between the VTP system and the drain system
is defined as the point where the return line to Tank 241-AW-106 leaves the seal pot.
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4.1.2.4 Monitoring & Control System (MCS)
The Monitoring & Control System provides instruments values for the 241-AW VTP in to
PCSACS and the W-314 system. The boundary is located at the exhauster PLC located in
enclosures AW241-VTP-CP-110/111.
4.1.2.5 Raw Water System
Raw water is supplied to the de-entrainers by the AW Tank Farm auxiliary raw water system and
is delivered by truck. Raw water is used to flush the de-entrainer, reducing solids buildup. Each
de-entrainer has one hose connection for the water supply hook-up. The water supply also may
be isolated from the supply side by VTP system isolation valves (AW241-VTP-V-151 and
AW241-VTP-V-161). The boundary between the VTP system and the raw water supply system
is defined as the hose connections for each de-entrainer.
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Figure 5. AW Tank Farm Ventilation Tank Primary System Boundary Drawing.
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Table 5. AW Tank Farm Waste Tank Riser Identification for VTP Interface.
Tank Inlet Riser Number Outlet Riser Number Drawing Number*
241-AW-101 AW101-WST-RISER-010 AW101-WST-RISER-009 H-14-010502 sh.1
241-AW-102 AW102-WST-RISER-010 AW102-WST-RISER-024 H-14-010502 sh.2
241-AW-103 AW103-WST-RISER-009 AW103-WST-RISER-010 H-14-010502 sh.3
241-AW-104 AW104-WST-RISER-010 AW104-WST-RISER-009 H-14-010502 sh.4
241-AW-105 AW105-WST-RISER-009 AW105-WST-RISER-010 H-14-010502 sh.5
241-AW-106 AW106-WST-RISER-009 AW106-WST-RISER-010 H-14-010502 sh.6
Note:
*H-14-010502, Sheets 1-7, Dome Penetration Schedules (WST/WSTA) Tank 241-AW- [101 – 106].
4.1.3 Physical Layout and Location
The U.S. Department of Energy Hanford Site is located northwest of Richland, Washington. The
DSTs are located on the Hanford Site in areas identified as the 200 East Area and 200 West
Area. The AW Tank Farm is located in the 200 East Area. Figures 6 and 7 provide aerial views
of the AW Tank Farm and the ventilation system equipment.
Figure 6. Aerial View of the AW Tank Farm.
AW-101
AW-102
AW-103
AW-104
AW-105
AW-106
N
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Figure 7. Aerial View of the AW Tank Farm Central Exhaust Station.
4.1.4 Principles of Operation
Air inflow through the inlet-air control station is the primary source of ventilation air credited
with performing the safety function of flammable gas removal. Additional air inflow occurs
through infiltration pathways. The fresh air mixes with and dilutes the flammable gas within the
tank headspace and is removed through the exhaust ductwork by the exhaust fan. This dilution
and removal maintains the flammable gas concentration 25% of the LFL. The negative
pressure in the tank headspace created by the exhaust fan confines contaminated vapors by
maintaining a controlled flow from the outside environment, into the tank headspace, and out
through the filtered exhaust system. The inlet HEPA filter prevents release of contamination
VTA Stack
VTP Stacks
VTP Exhausters
De-entrainers
VTP Ductwork
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during periods of ventilation system shutdown. Welded and flanged exhaust ductwork maintains
confinement of the exhaust air.
The de-entrainer removes entrained moisture particles and the exhaust air heater lowers the
relative humidity of the exhaust air stream through sensible heating. This removes moisture and
helps limit condensation on the potentially cooler surfaces of the HEPA filters and housings.
Moisture on the HEPA filters could cause HEPA filter performance degradation or premature
failure. The prefilters capture large particulates to extend the life of the HEPA filters by
preventing premature loading. The HEPA filters provide primary confinement of radioactive
particulates with installed removal efficiencies of greater than 99.95% for polydisperse particles
as small as 0.3 m.
An adjustable speed drive (VFD) and motor for the exhaust fans was chosen to accommodate all
four modes of operation considered in the system design (RPP-11731, Rev. 1):
1. Normal waste storage (700 acfm exhaust at 81°F)
2. Waste tank retrieval (2200 acfm exhaust at 79°F)
3. Waste tank retrieval with mixer pump operating (2700 acfm exhaust at 140°F; inlet
air through a 12-inch riser)
4. Waste tank retrieval with mixer pump operating (3000 acfm exhaust at 145°F; inlet
air through a 12-inch riser)
As the ventilation system pressure changes, such as from progressive filter loading or when
operational requirements change, the exhaust stack flow instrument will sense the change in flow
through the PLC, that will signal the VFD to increase the speed of the motor. Subsequently the
exhaust fan speed will increase to maintain a constant stack airflow.
The stack sampling and monitoring subsystem monitors the stack for release of radioactive
particulates. Vacuum pumps sample the exhaust air stream through separate sample probes and
pass the sampled air stream through filters. The CAM continuously monitors a sample filter to
provide real time monitoring and alarm functions to notify operations personnel of the release of
elevated levels of radioactive particulates. The record sampler continuously collects the
radioactive particulates in the sampled air stream on another sample filter. Subsequent
laboratory analysis of this filter paper provides a measurement of the gross radioactive
particulate emissions from the stack.
4.1.5 System Reliability Features
The system consists of several passive components, thus lowering the potential for failure. The
inlet air flow controller, the filters and de-entrainers are all passive requiring no external support
systems for their operation.
The system is designed for reliability through redundancy. The first example of this occurs at
the inlet of the tank. Air is allowed into the tank through two different methods. An inlet filter is
installed on each tank, which is to serve as a controlled inlet flow path. In parallel with the inlet
filter there are various air in-leakage pathways, such as gaps in cover blocks and risers and
transfer routes from other tanks and farms. While steps have been taken to seal these other
RPP-15121 Rev. 4
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pathways as tight as possible, 100% sealing has not been fully achieved. Although it would be
optimal to have the other inlet paths sealed, it does provide for a parallel path in the event that
the inlet filter becomes blocked.
Component redundancy also provides increased reliability for the de-entrainers, exhaust trains,
and fans in the ventilation system. Two de-entrainers and two exhaust trains are located in
parallel to each other. The configuration of the system does not allow crossover of components
to the other train, except for the de-entrainers. Either de-entrainer can be used with either
exhaust train. The current configuration allows for complete redundancy of the main active
components (heaters, automatic dampers, and fans).
The isolation valves are interlocked with the fan start circuitry to automatically open when the
fan is started and to close when the fan is stopped.
4.1.6 System Control Features
The VTP system is fully automatic system with appropriate alarms and interlocks that are
associated with component functions. The instrumentation and control alarms and interlocks,
including setpoints, are identified on the system P&ID, H-14-020102, and the setpoint values are
calculated in RPP-15034.
Automated interlocks are used by the primary exhaust system to protect equipment from damage,
ensure proper functioning of the system and protect both on-site and off-site personnel. Software
Time-delays are used to allow for proper start-up of the system. The HEPA filter dP interlock
system uses software time delays. The time-delay relays allow the various operating parameters,
such as pressures, flow, and temperature, to be established and/or to reach equilibrium. Once the
time limit on the relay is reached, the interlock will engage if the operating parameter is not
within the correct range.
Instrumentation installed on the VTP system is used to monitor the ventilation system parameters
which include the following:
Tank Headspace Pressure
Tank Inlet Air-Control Station Filter dp
Exhaust System Filter dp
De-entrainer and Exhaust Train Seal Pot Level
Exhaust System Airflow
Exhaust Train Air Temperature
Glycol Tank Level
Glycol Tank Temperature
Glycol Pump Pressure
CAM Radiation Level
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CAM Sample Flow
Record Sample Flow
PLC Cabinet Temperature and Humidity
This monitoring program indicates when parameters are outside of the expected range so that
corrective actions can be taken, if required. Validation of software used for the VTP system can
be found in RPP-14957, Qualification Test Procedure for AN Farm HVAC System, and RPP-
14903, Qualification Test Report for AN Farm HVAC System. These test report also apply to
the 241-AW VTP.
4.2 OPERATIONS
This section summarizes the operating procedure for the VTP system, TO-060-107 (Operate
AW-241 Primary Ventilation Systems (VTP)). Response procedures for alarms, abnormal
operating conditions, and emergencies also are identified in this section.
4.2.1 Initial Configuration (Prestartup)
Prestartup verifications ensure that the following requirements are met.
If the exhauster has been shutdown for greater than 30 days, verify differential pressure
gauges and temperature gauges have been calibrated within the last 365 days
The HEPA filter housing aerosol test has been accomplished within the last 12 months.
The liquid levels in all tanks are 6 in.
The annual CAM calibration and quarterly CAM interlock functional tests have been
performed.
All maintenance or other activities are complete
o ANSI/HPS N13.1, Annual inspection testing completed.
4.2.2 System Startup
Startup of the A Train or B Train AW Tank Farm VTP system is performed as follows. Only
one of these systems is intended to be operating at any given time.
Perform Exhauster Valve Line up
Perform Exhauster Electrical Line up
Perform De-entrainer Valve Line up
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The CAM is inspected in accordance with TF-OPS-005
Open one of the exhauster isolation valves (AN241-VTP-MOV-352/361, AN241-VTP-
MOV-452/461)
Initiate glycol system heating until the glycol temperature is 110 F
Start the exhauster from AW241-VTP-CP-110/111 HMI display or MCS
Adjust stack flow as required from AW241-VTP-CP-110/111 HMI display
Operating parameters are verified to be within normal operating range or MCS
4.2.3 Normal Operations
The VTP system has only one normal operating mode in which one exhaust train is operating
and the other exhaust train is in standby. Daily operations consist primarily of performance of
surveillance activities in accordance with TF-OR-DR-EV and health physics technician checks
of the CAM, record sampler, and housing radiation levels. In addition to operator rounds, TO-
060-107, Operate AW-241 Primary Ventilation Systems, contains instructions for other data
collection.
Seal-pot level is checked weekly, and addition of 1 to 2 gal of water to the seal pots may be
required.
4.2.4 Off-Normal Operations
The emergency and abnormal operating procedures identified in Appendix C, Table C-3, may
contain actions involving the AW Tank Farm VTP system. The alarm response procedures
identified in Appendix C, Table C-3, specify automatic actions in the event of an alarm and
operator actions necessary to restore normal system operation. See the specific procedures for
details.
Temporary power provisions have been provided that allow for the exhausters to be powered by
a portable generator. Transfer switch AW241-VTP-MTS-350/450 is placed into the generator
position and a generator can be connected to connection AW241-VTP-WR-101/102 to supply
power to the exhausters. This configuration is currently not approved to operate.
4.2.5 System Shutdown
Shutdown of the A Train or B Train AW Tank Farm VTP system is performed as follows.
Stop the exhauster from AW241-VTP-CP-110/111 HMI display or MCS.
De-energize the exhauster per TO-060-107.
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Open exhauster main electrical disconnect switch, AW241-VTP-MTS-350/450.
4.2.6 Safety Management Programs and
Administrative Controls
The following Safety Management Programs and Administrative Controls (ACs) specified in
HNF-SD-WM-TSR-006 may apply to the equipment described in this SDD:
SAC 5.8.3, “Flammable Gas Controls for Inactive/Miscellaneous Tanks/Facilities”
AC 5.9.2, “Ignition Controls”
4.3 TESTING AND MAINTENANCE
Design features that enable temporary configurations to support corrective maintenance or
modifications are described in this section, as well as required testing and preventive
maintenance activities.
4.3.1 Temporary Configurations
The only temporary configuration that would be used for the ventilation is connection of a
portable HEGA filter skid. This skid would be connected to a flange connection located at the
outlet of the filter train before the exhaust fan. This allows for the HEPA filtered air to be routed
to a skid containing HEGA abatement filters and exhaust fan. The outlet from this skid would be
routed back to the exhauster stack and CAM monitoring. To accomplish this, the lower stack
section of the exhaust stack would be removed and a connection made to the upper stack section
via a flanged connection.
4.3.2 TSR-Required Surveillances
See the following sections for a complete description of the required surveillances and how the
surveillances are performed.
Section 3.7.2.1 , DST Primary Ventilation Systems, LCO 3.4
4.3.3 Non-TSR Inspections and Testing
4.3.3.1 HEPA Filter In-Place Leak Testing
The annual aerosol test of the HEPA filters is performed in accordance with 3-VBP-156 to verify
that the filter removal efficiency is 99.95%. This test is an in-place leak test to verify the
overall efficiency of the HEPA filter system. This test is different from the original factory test,
which is a penetration test that tests the efficiency of the filter medium only. The in-place leak
RPP-15121 Rev. 4
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test verifies the efficiency of the entire filter assembly as installed, including the mating surface
of the filter inside the housing.
Duct air velocity and volumetric flow rate are measured with a pitot tube traverse, and the
baseline concentration of a DOE-approved challenge aerosol is determined. The aerosol is then
injected upstream of the HEPA filter to be tested, and the concentration of aerosol downstream
of the filter is measured. The filter efficiency then is calculated as the ratio of the penetration
concentration to the baseline concentration, usually expressed as a percentage.
The HEPA filter in-place leak test is an environmental requirement as described in Section
3.7.3.1 .
4.3.3.2 Stack Flow-Rate Measurement
Stack velocity and volumetric flow-rate measurements are performed at least annually in
accordance with 3-VBP-155, along with site-specific datasheets. A pretest leak test is performed
on the measurement equipment. The relative humidity and static pressure of the air stream are
measured, and then the temperature and velocity pressure at each point on a pitot tube traverse
are measured. The velocity and volumetric flow rate are calculated from these data. The pitot
tube performance is verified by demonstrating repeatability of measurements. A posttest leak
test is performed on the measurement equipment.
The stack flow-rate measurement is an environmental requirement as described in Section
3.7.3.2 .
4.3.3.3 Continuous Air Monitor and Record Sampler Inspections
CAM and record sampler inspections are performed daily in accordance with TF-OPS-005 and
monthly in accordance with TF-OPS-021, Inspections and Source Checks of Primary Tank
Exhauster, Annulus Exhauster AMS-4 CAMs and Effluent Record Samplers. The inspection
includes checks of set points and sampler flow rates.
4.3.4 Maintenance
Periodic preventive maintenance specified in the preventive maintenance/surveillance system is
summarized in this section.
4.3.4.1 Continuous Air Monitor and Record Sampler Instrument Calibration
Calibration of vacuum gauges and flow switches and functional testing of the flow totalizer are
performed at least every 330 days in accordance with 6-FCD-728, ANSI N13.1 Compliance for
AW Exhausters. In addition to calibration, the flow switches and flow totalizer are inspected for
mechanical integrity.
The flow rate adjustments are an environmental requirement as described in ANSI/HPS N13.1,
Table 5 below.
RPP-15121 Rev. 4
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4.3.4.2 Continuous Air Monitor Calibration
The CAM is calibrated at least every 330 days in accordance with 6-RM-637, AW and AW
HVAC AMS-4 Continuous Air Monitor Calibration. The installed CAM is replaced with a CAM
that was calibrated in the shop, thus minimizing system downtime. The removed CAM then can
be calibrated for future installation.
Table 6. ANSI/HPS N13.1 Maintenance, Calibration and Field Check.
ANSI/HPS N13.1, Table 5 -Summary of Maintenance, Calibration and Field Check
Requirements
Cleaning of thermal anemometer elements. As required by application
lnspect pitot tubes for contaminant deposits. At least annually
lnspect pitot tube systems for leaks. At least annually
lnspect sharp-edged nozzles for damage. At least annually or after maintenance that could
cause damage
Check nozzles for alignment, presence of deposits,
or by
other potentially degrading factors.
Annually
Check transport lines of HEPA-filtered applications
to determine if cleaning is required.
Annually
Clean transport lines, Visible deposits for HEPA-filtered applications.
Surface density of 1 glcm3for other applications
Inspect or test the sample transport system for
leaks. At least annually
Check mass flow meters of sampling systems with
a secondary or transfer standard.
At least quarterly
Check sampling flow rate through critical flow At the start of each sampling period
Inspect rotameters of sampling systems for
presence of foreign matter. At the start of each sampling period
Check response of stack Row rate systems. At least quarterly
Calibration of flow meters of sampling systems. At least annually
Calibration of effluent flow measurement devices At least annually
Calibration of timing devices, At least annually
RPP-15121 Rev. 4
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4.3.4.3 Heater Temperature Switch Calibration
The heater outlet temperature switches are calibrated at least every 182 days in accordance with
6-TCD-603, Exhauster HVAC RTD Functional Check.
4.3.4.4 Vacuum Relief Valve Calibration
Vacuum relief valves located on 241-AW-104/106 air inlet stations are to be calibrated at least
every 330 days in accordance with 6-PCD-686, Anderson Greenwood-Set Pressure Verification
and Adjustment for Pilot Operated Vacuum Relief Valves.
4.3.4.5 Differential-Pressure Instrument Calibration
dP transmitters are calibrated at least every 330 days in accordance with 6-PCD-613. This
calibration is an environmental requirement as described in Section 3.7.4.2 .
Inlet air-control station dP indicators are calibrated at least every 182 days in accordance with
6-PCD-511, Dwyer Magnehelic Differential Pressure Series 2000 and Capsehelic Differential
Pressure Series 4000.2
4.3.4.6 Filter Replacement
Prefilters and HEPA filters are replaced using preventive maintenance/surveillance datasheets
when the dP across the filter exceeds the established limit, if a HEPA filter fails the in-place leak
test, or if the radioactive material loading on the filter exceeds limits. Replacement of the
prefilters and HEPA filters based on housing radiation level is an ALARA requirement as
described in Section 3.7.4.1 .
4.3.4.7 Variable Frequency Drive
There will be no routine maintenance required for the VFD. The VFD is readily available,
relatively small, installed in a conditioned cabinet and will operate on a regular basis; therefore,
routine maintenance is not deemed to be cost effective.
4.3.4.8 Post maintenance Testing
The post maintenance testing program for tank farms is implemented in TFC-ENG-STD-08, Post
Maintenance Testing, and applies to corrective and preventive maintenance and modification
work. A graded approach is used to determine the rigor of post maintenance testing so that the
testing is consistent with the equipment’s safety categorization. Post maintenance testing
provides reverification of a component’s functional capability, verification that corrective
maintenance has satisfactorily corrected the deficiency, and verification that no new deficiencies
or abnormal conditions have been created by the maintenance or testing activities.
Specific post maintenance testing called out on the preventive maintenance/surveillance
datasheets for periodic preventive maintenance on the VTP system includes the following:
2 Dwyer is a trademark of Dwyer Instruments, Inc., Michigan City, Indiana.
RPP-15121 Rev. 4
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HEPA filters must undergo aerosol in-place leak testing after filter replacement to verify
installed penetration efficiency.
4.3.4.9 Post modification Testing
General requirements for testing activities are identified in TFC-ENG-DESIGN-C-18, Testing
Practices, including development testing, acceptance testing, qualification testing, preoperational
testing, and operational testing. The extent and rigor of the test program is based on a graded
approach as appropriate to the size, complexity, and risks associated with the project or SSCs
involved. ASME AG-1 includes specific testing requirements for newly installed ventilation
systems such as duct and housing leak testing and HEPA filter penetration efficiency testing
requirements.
4.4 SUPPLEMENTAL INFORMATION
Section is not applicable.
RPP-15121 Rev. 4
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5.0 REFERENCES
00-05-006, 2010, Hanford Site Air Operating Permit Renewal 1, Rev. F, Benton County Clean
Air Authority, Washington State Department of Ecology, Washington State Department
of Health.
3-VB-155ZC, Appendix ZC, 241-AW Exhauster Stack 296-A-46 Air Flow Test Data Sheets,
Tank Farm Maintenance Procedures, Washington River Protection Solutions LLC,
Richland, Washington.
3-VB-155ZD, Appendix ZD, 241-AW Exhauster Stack 296-A-47 Air Flow Test Data Sheets,
Tank Farm Maintenance Procedures, Washington River Protection Solutions LLC,
Richland, Washington.
3-VBP-155, Air Flow Test for Tank Farm Stack and Ducts, Tank Farm Maintenance Procedures,
Washington River Protection Solutions LLC, Richland, Washington.
3-VB-156CC, Appendix CC, AW241-VTP-EF-009 (A-Train) Tank Exhauster 296-A-46 HEPA
Filter Aerosol Test Data Sheets, Tank Farm Maintenance Procedure, Washington River
Protection Solutions LLC, Richland, Washington.
3-VB-156CD, Appendix CD, AW241-VTP-EF-010 (B-Train) Tank Exhauster 296-A-47 HEPA
Filter Aerosol Test Data Sheets, Tank Farm Maintenance Procedure, Washington River
Protection Solutions LLC, Richland, Washington.
3-VB-156TW, Appendix TW, 241-AW Tank Inlet Filter Aerosol Test Data Sheets, Tank Farm
Maintenance Procedure, Washington River Protection Solutions LLC, Richland,
Washington.
3-VBP-156, Exhauster-Related HEPA Filter In-Place Leak Test (Aerosol Test), Tank Farm
Maintenance Procedures, Washington River Protection Solutions LLC, Richland,
Washington.
6-FCD-077, Stack Sampling, Monitoring and Annulus CAM Enclosure Systems, Tank Farm
Maintenance Procedures, Flow Controller/Indicator Device, Washington River Protection
Solutions LLC, Richland, Washington.
6-FCD-029, ANSI N13.1 Compliance for AW Exhausters, Tank Farm Maintenance Procedures,
Flow Controller/Indicator Device, Washington River Protection Solutions LLC,
Richland, Washington.
6-PCD-511, Dwyer Magnehelic Differential Pressure Series 2000 and Capsehelic Differential
Pressure Series 4000, Tank Farm Maintenance Procedures, Pressure Control/Indicating
Devices, Washington River Protection Solutions LLC, Richland, Washington.
RPP-15121 Rev. 4
5-2
6-PCD-613, AW and AN HVAC Foundation Fieldbus Pressure Transmitters, Tank Farm
Maintenance Procedures, Pressure Control/Indicating Devices , Washington River
Protection Solutions LLC, Richland, Washington.
6-PCD-686, Anderson Greenwood-Set Pressure Verification and Adjustment for Pilot Operated
Vacuum Relief Valves, Tank Farm Maintenance Procedures, Pressure Control/Indicating
Devices, Washington River Protection Solutions LLC, Richland, Washington.
6-RM-617, Perform Functional Check for AN-Farm Primary Exhaust Stack Continuous Air
Monitor, Tank Farm Maintenance Procedures, Radiation Monitoring, Washington River
Protection Solutions LLC, Richland, Washington.
6-RM-637, AN and AW HVAC AMS-4 Continuous Air Monitor Calibration, Tank Farm
Maintenance Procedures, Radiation Monitoring, Washington River Protection Solutions
LLC, Richland, Washington.
6-TCD-603, Exhauster HVAC RTD Functional Check, Tank Farm Maintenance Procedures,
Temperature Control/Indicating Devices, Washington River Protection Solutions LLC,
Richland, Washington.
10 CFR 830.3, 2008, “Nuclear Safety Management-Definitions,” Title 10, Code of Federal
Regulations, Part 830.3, as amended.
11-AMD-054, 2011, Contract Number DE-AC27-08RV14800 – Transmittal of Contract
Modification 094 and Request for Proposal to Upgrade the Double-Shell Tank Primary
Ventilation Systems to Safety-Significant, U.S. Department of Energy, Office of River
Protection, Richland, Washington.
40 CFR 60, 2008, “Protection of Environment-Standards of Performance for New Stationary
Sources,” Title 40, Code of Federal Regulations, Part 60, as amended.
40 CFR 61, 2008, “Protection of Environment-National Emission Standards for Hazardous Air
Pollutants,” Title 40, Code of Federal Regulations, Part 61, as amended.
ACGIH, 1988, Industrial Ventilation: A Manual of Recommended Practice, American
Conference of Governmental Industrial Hygienists, Cincinnati, Ohio.
AIR-01-505, 2001, “Air Emissions Inspection Report Concerning the 296-P-23 Emission Unit,”
(letter from Allen W. Conklin to Walter J. Pasciak, ORP, May 11, with attachment “Air
Emissions Inspection Report,” Audit Number 243), Washington State Department of
Health, Olympia, Washington.
ANSI/ASHRAE 52.1, 1992, Gravimetric and Dust-Spot Procedures for Testing Air-Cleaning
Devices Used in General Ventilation for Removing Particulate Matter, American
National Standards Institute/American Society of Heating, Refrigerating and Air-
Conditioning Engineers, Inc., Atlanta, Georgia.
RPP-15121 Rev. 4
5-3
ANSI B16.5, 1977, Steel Pipe Flanges, Flanged Valves, and Fittings, American National
Standards Institute/American Society of Mechanical Engineers, New York, New York.
ANSI B16.9, 1978, Factory-Made Wrought Steel Butt-welding Fittings, American National
Standards Institute, New York, New York.
ANSI/HPS N13.1, 1999, Sampling and Monitoring Releases of Airborne Radioactive Substances
from the Stacks and Ducts of Nuclear Facilities, American National Standards Institute,
New York, New York.
ANSI/IEEE N42.18, 1980, Specification and Performance of On-Site Instrumentation for
Continuously Monitoring Radioactivity in Effluents, American National Standards
Institute, New York, New York.
ANSI/ASME N509, 1989, Nuclear Power Plant Air Cleaning Units and Components, American
National Standards Institute/American Society of Mechanical Engineers, New York,
New York.
ANSI/ASME N510, 1989, Testing of Nuclear Air Treatment Systems, American National
Standards Institute/American Society of Mechanical Engineers, New York, New York.
ANSI/ASME NQA-1, 2000, Quality Assurance Program for Nuclear Facilities, American
National Standards Institute/American Society of Mechanical Engineers, New York, New
York.
ANSI/ASME NQA-2, 1989, Quality Assurance Requirements for Nuclear Facility Applications,
American National Standards Institute/American Society of Mechanical Engineers,
New York, New York. (Currently inactive)
ARH-CD-304, 1975, Functional Design Criteria -- Additional High-Level Waste Storage and
Handling Facilities, Rev. 3, Atlantic Richfield Hanford Company, Richland,
Washington.
ASME AG-1a, 2000, Code on Nuclear Air and Gas Treatment (Addenda), American Society of
Mechanical Engineers, New York, New York.
ASTM A53-79, 1979, Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-
Coated, Welded and Seamless, American Society for Testing and Materials, West
Conshohocken, Pennsylvania.
ASTM A105-79, 1979, Standard Specification for Carbon Steel Forgings for Piping
Applications, American Society for Testing and Materials, West Conshohocken,
Pennsylvania.
ASTM A106-79b, 1979, Standard Specification for Seamless Carbon Steel Pipe for High-
Temperature Service, American Society for Testing and Materials, West Conshohocken,
Pennsylvania.
RPP-15121 Rev. 4
5-4
ASTM A135-73a, 1973, Standard Specification for Electric-Resistance-Welded Steel Pipe,
American Society for Testing and Materials, West Conshohocken, Pennsylvania.
ASTM A181-77, 1977, Standard Specification for Carbon Steel Forgings, for General-Purpose
Piping, American Society for Testing and Materials, West Conshohocken, Pennsylvania.
ASTM A234-79a, 1979, Standard Specification for Pipe Fittings of Wrought Carbon Steel and
Alloy Steel for Moderate and High Temperature Service, American Society for Testing
and Materials, West Conshohocken, Pennsylvania.
B-120-C7, 1978, Construction Specification for the 241-AW Tank Farm Completion Project
B-120, Vitro Engineering Corporation, Richland, Washington.
DE05NWP-001, 2007, Approval of Non-Radioactive Air Emissions Notice of Construction
(NOC) for Operations of new ventilation systems in AN and AW Tank Farms, Rev. 1,
Washington State Department of Ecology, Richland, WA.
DOE/EH-0173T, 1991, Environmental Regulatory Guide for Radiological Effluent Monitoring
and Environmental Surveillance, U.S. Department of Energy, Washington, D.C.
DOE/EV/1830-T5, 1980, A Guide To Reducing Radiation Exposure To As Low As Reasonably
Achievable (ALARA), Pacific Northwest Laboratory, Richland, Washington. NOTE:
Revised 1988 and issued as PNL-6577, listed below.
DOE-HDBK-1169-2003, Nuclear Air Cleaning Handbook, U.S. Department of Energy,
Washington, D.C.
DOE-STD-1189-2008, Integration of Safety into the Design Process, U.S. Department of
Energy, Washington, D.C.
DOE-STD-3009-94, Preparation Guide for U.S. Department of Energy Nonreactor Nuclear
Facility Documented Safety Analyses, U.S. Department of Energy, Washington, D.C.
DOE-STD-3024-2011, Content of System Design Descriptions, U.S. Department of Energy,
Washington, D.C.
FF-01, 2012, Radioactive Air Emissions License for the DOE Richland Office Hanford Site, State
of Washington Department of Health, Office of Radiation Protection.
Hanford Site Drawings:
H-2-70337, HVAC/Piping Vent Piping Plan 241-AW Tank Farm
H-2-70338, HVAC/Piping Vent Piping and Support Plan 241-AW Tanks
H-2-70339, HVAC – K2 System Equipment Plans Sections & Details
H-2-85608, Airflow Controller
H-2-85614, HEPA Filtered Inlet
RPP-15121 Rev. 4
5-5
H-2-90906, HVAC – K1 System Equipment Plan & Elevations
H-2-90909, HVAC – K1 System Equipment Schedules & Notes
H-2-90910, HVAC Details
H-2-90917, HVAC/Elec Heat Trace Plan Details & Notes
H-2-90921, Structural Concrete Shielding Wall Plan & Details
H-2-90922, Piping Primary Exhaust System Modification
H-2-90923, Piping Primary Sys Seal Pot Cond Lines and Dets
H-2-90924, Vessel Assembly De-Entrainer K1-1-1 and K1-1-2
H-2-90925, Piping Port Exhauster Plan, Sect, and Det
H-14-010502, Dome Penetration Schedules (WST/WSTA) Tank 241-AW-101 [thru 106]
H-14-020102, Ventilation Tank Primary System (VTP) O&M System P&ID
H-14-020202, Ventilation Tank Annulus System (VTA) O&M System P&ID
H-14-105336, Piping AW Farm TK Exhauster Plan
H-14-105679, AW-241-VTP (W-314) Exhauster Train “A” Assembly
H-14-105693, AW-241-VTP (W-314) Exhauster Train “B” Assembly
H-14-105705, Sheet 1, AW241-VTP (W-314) Equipment Schedules & General Notes
HNF-5196, 2001, Double-Shell Tank Ventilation Subsystem Specification, Rev. 2, CH2M HILL
Hanford Group, Inc., Richland, Washington. (Cancelled)
HNF-6779, 2003, Project Development Specification for HVAC, Rev. 1, CH2M HILL Hanford
Group, Inc., Richland, Washington.
HNF-IP-1266, Tank Farms Operations Administrative Controls, As Amended, Washington
River Protection Solutions LLC, Richland, Washington.
HNF-S-0552, 2010, Procurement Specification for Standard, Nuclear Grade, High Efficiency
Particulate Air (HEPA) Filters (For ASME AG-1 Section FC Compliant Filters), Rev. 6,
CH2M HILL Plateau Remediation Company, Richland, Washington.
HNF-SD-GN-ER-501, 2002, Natural Phenomena Hazards, Hanford Site, Washington, Rev. 1B,
CH2M HILL Hanford Group, Inc., Richland, Washington.
HNF-SD-W314-DRD-001, 2004, Preliminary Design Requirements Document for Project W-
314 Tank Farm Restoration and Safe Operations, Rev. 4, CH2M HILL Hanford Group,
Inc., Richland, Washington.
HNF-SD-WM-ABU-017, 1997, Acceptance of 241-AW Tank Inlet Air Filter and Control
Stations for Beneficial Use, Rev. 0, Fluor Daniel Hanford, Inc., Richland, Washington.
RPP-15121 Rev. 4
5-6
HNF-SD-WM-FHA-020, 2012, Tank Farm Fire Hazards Analysis, Rev. 7, Washington River
Protection Solutions LLC, Richland, Washington.
HNF-SD-WM-TSR-006, 2012, Tank Farms Technical Safety Requirements, Rev. 7I,
Washington River Protection Solutions LLC, Richland, Washington.
OSD-T-151-00007, 2012, Operating Specifications for the Double-Shell Storage Tanks, Rev. 9,
Washington River Protection Solutions LLC, Richland, Washington.
PNL-6577, 1988, Health Physics Manual of Good Practice for Reducing Radiation Exposure to
Levels that are As Low As Reasonably Achievable (ALARA), Pacific Northwest
Laboratory, Richland, Washington.
PNNL-10938, 1996, Evaluation of the Eberline AMS-3A and AMS-4 Beta Continuous Air
Monitors, Pacific Northwest National Laboratory, Richland, Washington.
RPP-6664, 2001, The Chemistry of Flammable Gas Generation, Rev. 1, CH2M HILL Hanford
Group, Inc., Richland, Washington.
RPP-7336, 2008, Requirements Verification Report for AW Tank Farms Upgrades, Rev. 3,
CH2M HILL Hanford Group, Inc., Richland, Washington.
RPP-7881, 2004, Specification for a Primary Exhauster System for Waste Tank Ventilation, Rev.
1, CH2M HILL Hanford Group, Inc., Richland, Washington.
RPP-11413, 2010, Ventilation System In-Service Requirements, Rev. 5, Washington River
Protection Solutions LLC, Richland, Washington.
RPP-11731, 2007, Thermal Hydraulic Evaluation for 241-AW Tank Farm Primary Ventilation
System, Rev. 1, CH2M HILL Hanford Group, Inc., Richland, Washington.
RPP-12722, 2012, Software Requirements Specification for AN/AW Farm HVAC Exhausters,
Rev. 3, Washington River Protection Solutions LLC, Richland, Washington.
RPP-13033, 2012, Tank Farms Documented Safety Analysis, Rev. 4M, Washington River
Protection Solutions LLC, Richland, Washington.
RPP-14903, 2004, Qualification Test Report for AN Farm HVAC System, Rev. 0, CH2M HILL
Hanford Group, Inc., Richland, Washington.
RPP-14957, 2003, Qualification Test Procedure for AN Farm HVAC System, Rev. 0B,
CH2M HILL Hanford Group, Inc., Richland, Washington.
RPP-15034, 2004, Project W-314 Primary Ventilation System Setpoint Determination, Rev. 0,
CH2M HILL Hanford Group, Inc., Richland, Washington.
RPP-15120, 2007, System Design Description for AW Tank Farm Ventilation Tank Annulus
System, Rev. 1a, CH2M HILL Hanford Group, Inc., Richland, Washington.
RPP-15121 Rev. 4
5-7
RPP-15131, 2007, System Design Description for AW Tank Farm Double-Shell Tank Waste
Storage System, Rev. 2, CH2M HILL Hanford Group, Inc., Richland, Washington.
RPP-15137, 2011, System Design Description for 200 Area Double-Shell Tank Waste Transfer
System, Rev. 6, Washington River Protection Solutions LLC, Richland, Washington.
RPP-15144, 2007, System Design Description of Electrical Distribution System for AW Tank
Farm, Rev. 2a, CH2M HILL Hanford Group, Inc., Richland, Washington.
RPP-16922, 2012, Environmental Specification Requirements, Rev. 24, Washington River
Protection Solutions LLC, Richland, Washington.
RPP-16977, 2005, W-314 DST Primary Exhauster System Supporting Calculations, Rev. 0,
CH2M HILL Hanford Group, Inc., Richland, Washington.
RPP-20278, 2004, Project W314, 241-AN and 241-AW Primary Ventilation System ASME AG-1
Code and WAC 246-247 Technology Standards Compliance Matrix, Rev. 0, CH2M HILL
Hanford Group, Inc., Richland, Washington.
RPP-21082, 2009, Software Configuration Management Plan for Base Operations Process
Control Systems, Rev. 2, Washington River Protection Solutions LLC, Richland,
Washington.
RPP-21625, Software Validation Report for HVAC - Project W-314, CH2M HILL Hanford
Group, Inc., Richland, Washington.
RPP-46436, 2010, Generic Effluent Monitoring System Qualification 3000 CFM Exhaust Stack,
AN, AW, POR126 and POR127, Rev. 0, Washington River Protection Solutions LLC,
Richland, Washington.
RPP-49949, 2011, Safety Design Strategy for the Safety-Significant DST Primary Tank
Ventilation Systems Upgrade Project, Rev. 0, Washington River Protection Solutions
LLC, Richland, Washington.
RPP-RPT-26393, 2008, High Temperature AMS-4 CAM ANSI N42.18 Qualification Test Report,
Rev. 0a, CH2M HILL Hanford Group, Inc., Richland, Washington.
RPP-RPT-49447, 2011, Safety-Significant DST Primary Tank Ventilation Systems – Functions
and Requirements Evaluation Document, Rev. 0, Washington River Protection Solutions
LLC, Richland, Washington.
RPP-SPEC-45605, 2012, Double-Shell Tank Ventilation Subsystem Specification, Rev. 1,
Washington River Protection Solutions LLC, Richland, Washington.
SD-340-FDC-001, Tank Functional Design Criteria, Rockwell Hanford Operations, Richland,
Washington.
RPP-15121 Rev. 4
5-8
SD-402-FDC-001, 1982, Functional Design Criteria 241-AW Ventilation Upgrade Project
B-402, Rev. 0-2, Rockwell Hanford Operations, Richland, Washington.
TF-OPS-005, Daily CAM and Record Sampler Inspections, Tank Farm Plant Operating
Procedure, Health Physics, Washington River Protection Solutions LLC, Richland,
Washington.
TF-OPS-006, Air Sample Filter Exchange and Inspections for Record Samplers, Stack and
Annulus CAMs, Tank Farm Plant Operating Procedure, Health Physics, Washington
River Protection Solutions LLC, Richland, Washington.
TF-OPS-021, Inspections and Source Checks of Primary Tank Exhauster, Annulus Exhauster
AMS-4 CAMs and Effluent Record Samplers, Tank Farm Plant Operating Procedure,
Health Physics, Washington River Protection Solutions LLC, Richland, Washington.
TF-OPS-IHT-004, Preparation and Field Use of iTx Multi-Gas Monitor, Washington River
Protection Solutions LLC, Richland, Washington.
TF-OR-DR-EV, EV Daily Rounds, Tank Farm Plant Operating Procedure, Washington River
Protection Solutions LLC, Richland, Washington.
TFC-ENG-CHEM-D-21, Process Engineering Waste Surveillance Data Review, Washington
River Protection Solutions LLC, Richland, Washington.
TFC-ENG-CHEM-P-14, Operating Specification Documents, Washington River Protection
Solutions LLC, Richland, Washington.
TFC-ENG-DESIGN-C-18, Testing Practices, CH2M HILL Hanford Group, Inc., Richland,
Washington.
TFC-ENG-DESIGN-P-28, Ventilation System Quality Assurance Level Determination,
Washington River Protection Solutions LLC, Richland, Washington.
TFC-ENG-FACSUP-P-01, Conduct of System Engineering, Washington River Protection
Solutions LLC, Richland, Washington.
TFC-ENG-STD-02, 2011, Environmental/Seasonal Requirements for TOC Systems, Structures,
and Components, Rev. A-8, Washington River Protection Solutions LLC, Richland,
Washington.
TFC-ENG-STD-06, 2011, Design Loads for Tank Farm Facilities, Rev. C-4, Washington River
Protection Solutions LLC, Richland, Washington.
TFC-ENG-STD-07, 2011, Ventilation System Design Standard, Rev. F-1, Washington River
Protection Solutions LLC, Richland, Washington.
TFC-ENG-STD-08, Post Maintenance Testing, CH2M HILL Hanford Group, Inc., Richland,
Washington.
RPP-15121 Rev. 4
5-9
TFC-ESHQ-ENV_FS-C-01, Environmental Notification, Washington River Protection Solutions
LLC, Richland, Washington.
TFC-ESHQ-ENV-STD-03, Air Quality – Radioactive Emissions, Washington River Protection
Solutions LLC, Richland, Washington.
TFC-ESHQ-ENV-STD-05, Radioactive Airborne Effluent Sampling, Washington River
Protection Solutions LLC, Richland, Washington.
TFC-ESHQ-ENV-STD-06, Environmental Requirements Standard, Washington River Protection
Solutions LLC, Richland, Washington.
TFC-ESHQ-RP_MON-P-10, Required Radiological Surveillances, Washington River Protection
Solutions LLC, Richland, Washington.
TFC-ESHQ-RP_RWP-C-03, ALARA Work Planning, Washington River Protection Solutions
LLC, Richland, Washington.
TFC-ESHQ-S-STD-21, Machine Guarding, Washington River Protection Solutions LLC,
Richland, Washington.
TFC-OPS-MAINT-C-01, Tank Operations Contractor Work Control, Washington River
Protection Solutions LLC, Richland, Washington.
TFC-PLN-02, Quality Assurance Program Description, Washington River Protection Solutions
LLC, Richland, Washington.
TO-060-107, Operate AW-241 Primary Ventilation Systems, RPP Tank Farms Operating
Procedure, CH2M HILL Hanford Group, Inc., Richland, Washington.
Uniform Building Code, 1979, International Conference of Building Officials, Whittier,
California.
VI-50032, W-314 241-AW Phase II, CH2M HILL Hanford Group, Inc., Richland, Washington.
VI-50316, 241-AW Primary Ventilation System, CH2M HILL Hanford Group, Inc., Richland,
Washington.
W-314-C20, 2004, Construction Specification W-314 Phase 2 AW Tank Farm Upgrades, Rev. 2,
CH2M HILL Hanford Group, Inc., Richland, Washington.
W-314-P50, 2004, Procurement Specification W-314 Phase 2 AW Tank Farm Moisture
Separator Primary Ventilation System, Rev. 1, CH2M HILL Hanford Group, Inc.,
Richland, Washington.
W314-P-200, HVAC Duct/Demister Shielding Analysis, CH2M HILL Hanford Group, Inc.,
Richland, Washington.
RPP-15121 Rev. 4
5-10
W314-P-201, HVAC Duct System Piping Stress Analysis, CH2M HILL Hanford Group, Inc.,
Richland, Washington.
W314-P-202, HVAC Duct/Pipe Supports Analysis, CH2M HILL Hanford Group, Inc., Richland,
Washington.
W314-P-203, Drain System Piping Stress Analysis, CH2M HILL Hanford Group, Inc., Richland,
Washington.
W314-C-204, HVAC Skid & De-entrainer Foundations Structural Analysis, CH2M HILL
Hanford Group, Inc., Richland, Washington.
WAC 173-400, “General Regulations for Air Pollution Sources,” Washington Administrative
Code, as amended, Washington State Department of Ecology, Olympia, Washington.
WAC 173-401, “Operating Permit Regulation,” Washington Administrative Code, as amended,
Washington State Department of Ecology, Olympia, Washington.
WAC 173-460, “Controls for New Sources of Toxic Air Pollutants,” Washington Administrative
Code, as amended, Washington State Department of Ecology, Olympia, Washington.
WAC 246-247, “Radiation Protection—Air Emissions,” Washington Administrative Code, as
amended, Washington State Department of Ecology, Olympia, Washington.
WHC-SA-0484-FP, 1989, A Practical Method Of Performing Cost-Benefit Analysis Of
Occupational And Environmental Protective Measures, Westinghouse Hanford
Company, Richland, Washington.
WHC-SD-WM-DA-210, 1996, 241AW Air Intake System Analysis, Rev. 0, Westinghouse
Hanford Company, Richland, Washington.
WHC-SD-WM-DB-032, 1996, Design Basis for Tank Inlet Air Control Stations in the
241-AN Tank Farm, Rev. 0, Westinghouse Hanford Company, Richland, Washington.
WHC-SD-WM-ES-287, 1994, Methods of Limiting Waste Tank Vacuum Levels – ETN-94-0107,
Rev. 0, Westinghouse Hanford Company, Richland, Washington.
WHC-SD-WM-TRP-234, 1995, Development and Testing of a Passively Operated Air Flow
Control Device, Rev. 1, Westinghouse Hanford Company, Richland, Washington.
WHC-SD-WM-TRP-247, 1996, Test Report of Constant Air Flow Control Device for Tank Farm
Ventilation System, Rev. 0A, Westinghouse Hanford Company, Richland, Washington.
RPP-15121 Rev. 4
5-11
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RPP-15121 Rev. 4
A-i
APPENDIX A
SOURCE DOCUMENTS
RPP-15121 Rev. 4
A-ii
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RPP-15121 Rev. 4
A-1
APPENDIX A
SOURCE DOCUMENTS
Refer to Section 5.0 for a list of references used in development of this SDD.
RPP-15121 Rev. 4
B-i
APPENDIX B
SYSTEM DRAWINGS AND LISTS
RPP-15121 Rev. 4
B-ii
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RPP-15121 Rev. 4
B-1
APPENDIX B
SYSTEM DRAWINGS AND LISTS
Table B-1 contains the drawings and documents that comprise the design basis portion of the
design baseline (as defined in TFC-PLN-03, Engineering Program Management Plan) for the
AW Tank Farm VTP system. It includes essential drawings identified in the Document
Management & Control System (DMCS).
Table B-1. Essential Drawings and Design Basis Documents.
Drawing/Document
Number
Sheet
Number Title
Drawings
H-14-010502 1-6 Dome Penetration Schedules (WST/WSTA) Tank 241-AW-101 thru
Tank 241-AW-106
H-14-020000 1-4 Tank Farms System P&ID Legend
H-14-020102 1, 2, 4-12 Ventilation Tank Primary System (VTP) O&M System P&ID
H-14-030002 3 Electrical (EDS) One Line Diagram
Documents
HNF-SD-WM-TSR-006 Tank Farms Technical Safety Requirements
RPP-11413 Ventilation System In-Service Requirements
RPP-13033 Tank Farms Documented Safety Analysis
RPP-16922 Environmental Specification Requirements
RPP-SPEC-45605 Double-Shell Tank Ventilation Subsystem Specification
RPP-15121 Rev. 4
B-2
Table B-2 lists drawings and documents that comprise the design baseline, excluding the design
basis, as defined in TFC-PLN-03, for the AW Tank Farm VTP system. It includes support
drawings identified in DMCS.
Table B-2. Support Drawings and Documents. (6 Sheets)
Drawing/
Document
Number
Sheet
Number Title
Drawings
H-2-70325 4 Electrical Power and Control Elementary Diagrams
H-2-70331 1 Electrical Instrument Elementary Diagrams
H-2-70336 1 HVAC Flow & Control Diagram
H-2-70337 1 HVAC/Piping Vent Piping Plan 241-AW Tank Farm
H-2-70337 2 HVAC/Piping Support Plan 241-AW Tank Farm
H-2-70338 1-4 HVAC/Piping Vent Piping and Support Plan 241-AW Tanks
H-2-70341 1 HVAC/Piping Standard Tank Farm Details
H-2-70358 1 Instrumentation Exhaust Stack Radiation Monitor
H-2-70359 1 Instrumentation Panel Arrangement Instrument Building
H-2-70360 1 Instrumentation Panel Arrangement Instrument Building
H-2-70362 1, 3 Instrumentation Annunciator Elementary Diagram
H-2-70364 1 Instrumentation Rear Panel Wiring Instrument Building
H-2-70396 1 Tank Penetration & Riser Details 241-AW-Tanks
H-2-70399 1 Piping Plan 241-AW Tank Farm
H-2-70403 -
H-2-70408 Piping Plan Tank 101 thru 106
H-2-71900 1-2 Drawing Index
H-2-74896 1, 3 296-A-27 Stack Monitor Installation
H-2-85608 1-4 Airflow Controller
H-2-85614 1-5 HEPA Filtered Inlet
H-2-90905 1 DWG List/HVAC Flow Control Diagram & Notes
RPP-15121 Rev. 4
B-3
Table B-2. Support Drawings and Documents. (6 Sheets)
Drawing/
Document
Number
Sheet
Number Title
H-2-90906 1, 2 HVAC – K1 System Equipment Plan & Elevations
H-2-90907 1 HVAC Demolition Plan Central Exhaust Sta
H-2-90908 1 HVAC Miscellaneous Det
H-2-90909 1 HVAC – K1 System Equipment Schedules & Notes
H-2-90910 1 HVAC Details
H-2-90911 1 HVAC Support Structure Assembly
H-2-90912 1, 2 HVAC Plenum Assy
H-2-90914 1 HVAC End Panel Assembly
H-2-90915 1 HVAC Plenum Equipment Assembly DWG
H-2-90916 1 HVAC Fan to Plenum Assy & Instl
H-2-90917 1 HVAC/Elec Heat Trace Plan Details & Notes
H-2-90922 1 Piping Primary Exhaust System Modification
H-2-90923 1 Piping Primary Sys Seal Pot Cond Lines and Dets
H-2-90924 1 Vessel Assembly De-Entrainer K1-1-1 and K1-1-2
H-2-90925 1 Piping Port Exhauster Plan, Sect, and Det
H-2-90928 1, 2 Electrical Elementary Diagrams
H-2-90929 1 Electrical Connection Diagrams
H-2-90930 1 HVAC – K1 System Equipment Plan & Elevations
H-2-90930 2 Electrical Plans and Details
H-2-90905 1 DWG List/HVAC Flow Control Diagram & Notes
H-2-90907 1 HVAC Demolition Plan Central Exhaust Sta
H-2-90911 1 HVAC Support Structure Assembly
H-2-90912 1, 2 HVAC Plenum Assy
H-2-90914 1 HVAC End Panel Assembly
RPP-15121 Rev. 4
B-4
Table B-2. Support Drawings and Documents. (6 Sheets)
Drawing/
Document
Number
Sheet
Number Title
H-2-90915 1 HVAC Plenum Equipment Assembly DWG
H-2-92520 1 Generic Stack Beta Record Cabinet Split Entry Ass
H-2-95396 1 Drain Piping Instl Vent fans K1-5-1 & K1-5-2
H-2-95407 1, 2 Insulation Upgrade Vent Fans K1-5-1 & K1-5-2
H-14-030002 13-15 Electrical (EDS) Panelboard Schedule
H-14-100448 1, 2 Waste Tank Gas Characterization Installation
H-14-105676 1 AW241 Exhauster Train “A” & “B” Drawing Index (Project W-314)
H-14-105332 1 AW241-VTP (W-314) Drawing List
H-14-105336 1-5 Piping AW Farm Exhauster Plan
H-14-105337 1-3 Piping AW Farm Exhauster Drain System
H-14-105338 1-2 Piping AW Farm Exhauster Drain System Seal Pot
H-14-105339 1 Piping AW Farm Exh Seal Pot DR 3”DR-M9
H-14-105340 1-2 Piping 3”DR-M9 Riser-017 Tie-In (AW-106)
H-14-020102 1-12 P&ID 241-AW HVAC
H-14-105679 1-4 AW241-VTP (W-314) Exhauster Train “A” Assembly
H-14-105680 1-5 AW241-VTP (W-314) Exhauster Train “A” Skid Weldment & Details
H-14-105681 1-3 AW241-VTP (W-314) Exhauster Train “A” Upper And Lower Stack
Assemblies
H-14-105682 1-2 AW241-VTP (W-314) Exhauster Train “A” Inlet Spool Assembly &
Details
H-14-105683 1-2 AW241-VTP (W-314) Exhauster Train “A” Outlet Spool Assembly &
Details
H-14-105684 1-3 AW241-VTP (W-314) Exhauster Train “A” Heater Assembly &
Details
H-14-105685 1-2 AW241-VTP (W-314) Exhauster Train “A” Seal Pot Assembly &
Details
H-14-105686 1-3 AW241-VTP (W-314) Exhauster Train “A” Efl Monitoring Pump
Assy & Dets
RPP-15121 Rev. 4
B-5
Table B-2. Support Drawings and Documents. (6 Sheets)
Drawing/
Document
Number
Sheet
Number Title
H-14-105687 1-2 AW241-VTP (W-314) Exhauster Trains “A” & “B” Platform Assy &
Dets
H-14-105688 1-4 AW241-VTP (W-314) Exhauster Train “A” Unistrut Assembly
H-14-105689 1-3 AW241-VTP (W-314) Exhauster Train “A” Miscellaneous Details
H-14-105690 1-2 AW241-VTP (W-314) Exhauster Train “A” Instrument Assembly &
Details
H-14-105691 1-3 AW241-VTP (W-314) Exhauster Trains “A” & “B” Insulation
Assemblies
H-14-105693 1-4 AW241-VTP (W-314) Exhauster Train “B” Assembly
H-14-105694 1-5 AW241-VTP (W-314) Exhauster Train “B” Skid Weldment & Details
H-14-105695 1-3 AW241-VTP (W-314) Exhauster Train “B” Upper & Lower Stack
Assemblies
H-14-105696 1-2 AW241-VTP (W-314) Exhauster Train “B” Inlet Spool Assy &
Details
H-14-105697 1 AW241-VTP (W-314) Exhauster Train “B” Outlet Spool Assy &
Details
H-14-105698 1-3 AW241-VTP (W-314) Exhauster Train “B” Heater Assembly &
Details
H-14-105699 1-2 AW241-VTP (W-314) Exhauster Train “B” Seal Pot Assembly &
Details
H-14-105700 1-3 AW241-VTP (W-314) Exhauster Train “B” Efl Monitoring Pump
Assy & Dets
H-14-105701 1 AW241-VTP (W-314) Exhauster Trains “A” & “B” Sun Shield
Assembly
H-14-105702 1-4 AW241-VTP (W-314) Exhauster Train “B” Unistrut Assembly
H-14-105703 1-3 AW241-VTP (W-314) Exhauster Train “B” Miscellaneous Details
H-14-105704 1-2 AW241-VTP (W-314) Exhauster Train “B” Instrument Assembly &
Details
H-14-105705 1 AW241-VTP (W-314) Equipment Schedules & General Notes
H-14-105707 1-17 AW241-VTP (W-314) Exhauster Train “A” Loop Diagram
H-14-105708 1-3 AW241-VTP (W-314) Exhauster Trains “A” & “B” Communication
Diagram
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Table B-2. Support Drawings and Documents. (6 Sheets)
Drawing/
Document
Number
Sheet
Number Title
H-14-105709 1-2 AN241-VTP (W-314) Exhauster Train “A” Heat Trace Diagram
H-14-105710 1 AW241-VTP (W-314) Exhauster Train “A” One Line Diagram
H-14-105711 1-5 AW241-VTP (W-314) Exhauster Train “A” Connection Diagram
H-14-105712 1 AW241-VTP (W-314) Exhauster Train “A” Field Terminal Enclosure
H-14-105713 1-3 AW241-VTP (W-314) Exhauster Train “A” PLC Cabinet
H-14-105714 1-2 AW241-VTP (W-314) Exhauster Train “A” Enclosure Assembly
H-14-105715 1-3 AW241-VTP (W-314) Exhauster Train “A” Effluent Monitoring
System
H-14-105716 1-14 AW241-VTP (W-314) Exhauster Train “A” & “B”, Interface
Diagram
H-14-105717 1 AW241-VTP (W-314) Exhauster Train “A” Elementary Diagram
H-14-105720 1-17 AW241-VTP (W-314) Exhauster Train “B” Loop Diagram
H-14-105721 1-3 AW241-VTP (W-314) Exhauster Train “B” Heat Trace Diagram
H-14-105722 1 AW241-VTP (W-314) Exhauster Train “B” One Line Diagram
H-14-105723 1-5 AW241-VTP (W-314) Exhauster Train “B” Connection Diagram
H-14-105724 1 AW241-VTP (W-314) Exhauster Train “B” Field Terminal
Enclosure
H-14-105725 1-3 AW241-VTP (W-314) Exhauster Train “B” PLC Cabinet
H-14-105726 1-2 AW241-VTP (W-314) Exhauster Train “B” Enclosure Assembly
H-14-105727 1-3 AW241-VTP (W-314) Exhauster Train “B” Effluent Monitoring
System
H-14-105728 1 AW241-VTP (W-314) Exhauster Train “B” Elementary Diagram
Documents
HNF-6779 Project Development Specification for HVAC
RPP-11731 Thermal Hydraulic Evaluation for 241-AW Tank Farm Primary
Ventilation System
RPP-7553 Primary Ventilation System Ductwork Evaluation for 241-AN/AP/AW
RPP-7881 Specification for a Primary Exhauster System for Waste Tank
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Table B-2. Support Drawings and Documents. (6 Sheets)
Drawing/
Document
Number
Sheet
Number Title
Ventilation
RPP-12722 Software Requirements Specification for AN/AW Farm HVAC
Exhausters
RPP-15034 Project W-314 Primary Ventilation System Setpoint Determination
RPP-16977 W-314 DST Primary Exhauster System Supporting Calculations
RPP-20278 Project W-314, 241-AN and 241-AW Primary Ventilation Systems
ASME AG-1 Code and WAC 246-247 Technology Standards
Compliance Matrix
RPP-21625 Software Verification & Validation Report for HVAC Project W-314
Tank Farms Restoration & Safe Operations
RPP-22211 241-AN & 241-AW VTP Stack Flow Transmitter Maintenance
Calculation
RPP-RPT-26393 High Temperature AMS-4 CAM ANSI N42.18 Qualification Test
Report
W314-C-204 HVAC Skid & De-entrainer Foundations Structural Analysis
W314-E-013 CGI – Conduit Fittings/Metal Outlet Boxes
W314-E-039 CGI – Electrical Handholes
W314-I-301 Tank Space Pressure Transmitter Analysis for AW Tank Farm Phase
II
W-314-P34 Procurement Specification for Butterfly Valves
W-314-P50 Procurement Specification W-314 Phase 2 AW Tank Farm Moisture
Separator Primary Ventilation System
W314-P-200 HVAC Duct/Demister Shielding Analysis
W314-P-201 HVAC Duct System Piping Stress Analysis
W314-P-202 HVAC Duct/Pipe Supports Analysis
W314-P-203 Drain System Piping Stress Analysis
W314-P-204 HVAC Freeze Protection
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Table B-3 lists other documents that are for information only and should be used with caution, as
they are inactive, not maintained and may not reflect current field configuration.
Table B-3. Historical Drawings and Documents.
Document Number Title
ARH-CD-362 Functional Design Criteria – Additional High-Level Waste Storage and
Handling Facilities
ARH-CD-377 Conceptual Design Report – Additional High-Level Waste Storage
Facilities
B-120-C7 Construction Specification for the 214-AW Tank Farm Completion Project
B-120
B-402-C1 Construction Specification for 241-AW Tank Farm Ventilation System
Upgrade
FDM-T-200-0001 241-AW Tank Farm Facilities Description Manual
H-2-70300 Drawing Index
HNF-5196 Double-Shell Tank Ventilation Subsystem Specification
RHO-CD-1020 241-AW, AN Double Shell Waste Storage Tanks Safety Analysis Report,
Addendum I
RPP-6582 Software Verification and Validation Test Report for the HEPA Filter
Differential Pressure Fan Interlock System
RPP-7225 Acceptance for Beneficial Use for the HEPA Filter Differential Pressure
Interlock at 241-AW Tank Farm
WHC-SD-WM-DA-210 241AW Air Intake System Analysis
WHC-SD-WM-DB-032 Design Basis for Tank Inlet Air Control Stations in the 241-AW Tank Farm
WHC-SD-WM-ATR-154 Acceptance Test Report for Flow Controller and Vacuum Breaker
Assemblies for 241-AW Tank Farm
WHC-SD-WM-ES-287 Methods of Limiting Waste Tank Vacuum Levels
WHC-SD-WM-TRP-234 Development and Testing of a Passively-Operated Air Flow Control Device
WHC-SD-WM-TRP-247 Test Report, Constant Air Flow Control Device for Tank Farm Ventilation
Systems
- Results of Study Team 241-AW Primary Tank Ventilation System, March 23
- April 13, 1981
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B-9
Table B-4 contains a list of vendor information files that may provide the reader with technical
information regarding the design of the AW Tank Farm Ventilation Tank Primary system.
Vendor information records may be searched using the Insight database system, but the
information is available only by hardcopy from document control.
Table B-4. Vendor Information.
Vendor
Information File
Number
Title Notes
VI-50031 W-314 241-AN/AW Phase II
VI-50315 241-AN/AW Fan Shaft Seal
VI-50316 W-314 241-AW Primary Ventilation System
VI-50348 241-AW Vacuum relief valves 9209 V12SS
VI-50349 241-AN/AW Vacuum relief valves 9209 V12 SS
VI-22525
(Supplement 98) 241-AN/AW Certified as-built drawings
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APPENDIX C
SYSTEM PROCEDURES
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APPENDIX C
SYSTEM PROCEDURES
This appendix contains a list of applicable operating and maintenance procedures that may
provide the reader with technical information regarding the AW Tank Farm Ventilation Tank
Primary System. Operating procedures are available via the RPP Policies and Procedures web
site.
Table C-1. System Operating Procedures.
Procedure Number Title Notes
TO-060-107 Operate AW Tank Farm Primary Ventilation System (VTP)
TF-OPS-005 Daily CAM and Record Sampler Inspections
TF-OPS-028 Inspections and Source Checks of AMS-4 CAMs and Effluent
Record Samplers on AN/AW HMI-Controlled Exhausters.
TF-OPS-006 Air Sample Filter Exchange for Record Samplers, Stack and
Annulus CAMs
TF-OPS-028 Inspections and Source Checks of AMS-4 CAMs and Effluent
Record Samplers on AN/AW HMI-Controlled Exhausters
TF-OR-DR-EV EV Daily Rounds
TF-OR-WR-EV EV Weekly Rounds
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Table C-2. System Maintenance Procedures.
Procedure Number Title Notes
3-VB-155ZC Appendix ZC, 241-AW Exhauster Stack 296-A-46 Air Flow Test
Data Sheets.
3-VB-155ZD Appendix ZD, 241-AW Exhauster Stack 296-A-47 Air Flow Test
Data Sheets.
3-VB-156CC Appendix CC, AW241-VTP-EF-009 (A-Train) Tank Exhauster
296-A-46 HEPA Filter Aerosol Test Data Sheets.
3-VB-156CD Appendix CD, AW241-VTP-EF-010 (B-Train) Tank Exhauster
296-A-47 HEPA Filter Aerosol Test Data Sheets.
3-VB-156TW Appendix TW, 241-AW Tank Inlet Filter Aerosol Test Data
Sheets.
3-FCD-738 ANSI N13.1 Compliance for AW Exhausters
6-CVT-606 Calibrate MTL 2313B Trip Amplifier
6-LCD-612 Calibrate Drexelbrook 509-75 Level Transmitter on AN and AW
HVAC.
6-PCD-613 AW and AN HVAC Foundation Fieldbus Pressure Transmitters.
6-PCD-686 Anderson Greenwood Set Pressure Verification and Adjustment
for Pilot Operated Vacuum Relief Valves
6-RM-637 AN and AW HVAC AMS-4 Continuous Air Monitor Calibration
6-RM-655 AN and AW Tank Farm VTP Stack CAM Interlock Functional
Check.
7-MISC-660 AN and AW HVAC Endress-Hauser Level Transmitter
Replacement.
6-FCD-648 Calibrate Hastings HFC-303 Flow Controller on AN and AW
HVAC.
6-TCD-603 Exhauster HVAC RTD Functional Check
RPP-15121 Rev. 4
C-3
Table C-3. Emergency Response and Abnormal Operating Procedures.
Procedure Number Title Notes
ARP-T-231-00101 Respond to Panel 101 Alarms at 271-AW
ARP-T-231-00102 Respond to Panel 102 Alarms at 271-AW
ARP-T-231-00103 Respond to Panel 103 Alarms at 271-AW
ARP-T-231-00104 Respond to Panel 104 Alarms at 271-AW
ARP-T-231-00105 Respond to Panel 105 Alarms at 271-AW
ARP-T-231-00106 Respond to Panel 106 Alarms at 271-AW
ARP-T-231-EXH(A) Respond to A-Train Alarms at 241-AW VTP Exhaust Skid
ARP-T-231-EXH(B) Respond to B-Train Alarms at 241-AW VTP Exhaust Skid
TF-AOP-003 Response to Elevated Airborne Radioactivity
TF-AOP-005 Response to Unexpected Tank Temperature, Level, or
Flammable Gas Increase
TF-AOP-006 Response to High Radiation
TF-AOP-007 Response to Hanford Site Range Fire
TF-AOP-008 Response to High Winds and Dust Storms
TF-AOP-011 Response to Chemical and/or Radiological Events
TF-AOP-015 Response to Reported Odors or Vapor Exposures
TF-AOP-020 Response For Placing Personnel and Equipment in a Safe
Condition
TF-AOP-021 Response to Tank Farm Ventilation Upset
TF-ERP-005 Radiological Release
TF-ERP-006 Facility Fire Response
TF-ERP-008 Seismic Event Response
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APPENDIX D
SYSTEM HISTORY
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APPENDIX D
SYSTEM HISTORY
This optional appendix is not used.
RPP-15121 Rev. 4
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APPENDIX E
AW TANK FARM VTP SYSTEM FAN CURVE
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APPENDIX E
AW TANK FARM VTP SYSTEM FAN CURVE
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