pm-0614-7374-np - nuscale integral systems test overview ... · pm-0614-7374-np ©2014 nuscale...

NuScale Integral SystemsTest Overview - Closed

Session

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Bob HouserManager Test and Code Development

July 22, 2014

NuScale Nonproprietary

NUSCALEPOWER-

PM-0614-7374-NP © 2014 NuScale Power, LLC

Presenters

" Jose Reyes, Chief Technology Officer and co-founder of NuScalePower, LLC (NuScale)

" Adam Rasmussen, Testing Supervisor

" Brian Wolf, Lead Engineer Code Validation

" Bob Houser, Manager Testing and Code Development

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Meeting Objectives* Present past and future testing conducted at NuScale Integral

Systems Test (NIST) facility

* Gain alignment regarding the scope of future testing and the scopeand timeline of the ongoing facility upgrades

" Identify and discuss any potential additional tests to support designcertification:

- Discuss completeness of NIST test matrix for code validation

- Discuss relationship between the LOCA PIRT and test matrix

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Agenda

Closed Session

* PIRT phenomena and NRELAP5 validation

" Overview of scaling Analysis for NIST-1Facility

* NIST upgrade and capabilities

Test

" Testing completed and planned for

" RELAP5-3D NIST predictions

" Wrap-up

DCA

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Section 4 - PIRT Phenomenaand NRELAP5 Validation

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EMDAP for NuScale LOCA Analysis

Scaling &Testing

Element IEstablish Requirements for Evaluation Model Capability

1. Specify analysis purpose, transient class and power plant class2. Specify figures of merit3. Identify systems, components, phases, geometries, fields and processes that should be modeled4. Identify and rank phenomena and processes 1E PIRT

Element 2Develop Assessment Base

5. Specify objectives for assessment base6. Perform scaling analysis and identify similarity criteria

7. Identify existing data and/or perform lETs and SETs to complete database

8. Evaluate effects of lET distortions and SET scaleup capability

9. Determine experimental uncertainties

Element 3Develop Evaluation Model

10. Establish EM development plan11. Establish EM structure12. Develop or incorporate closure models

Element 4Assess Evaluation Model Adequacy

Closure Relations (Bottom-up) Integrated Evaluation Model (Top-down)13. Determine model pedigree and applicability to simulate physical processes 16. Determine capability of field equations and numeric solutions to represent processes14. Prepare input and perform calculations to assess model fidelity and/or accuracy and phenomena15. Assess scalabilify of models 17. Determine applicability of EM to simulate system components

18. Prepare input and perform calculations to assess system interactions and globalcapability

19. Assess scalability of integrated calculations and data for distortions

20. Determine EM biases and uncertainties

Return to appropriate elements, Nomake and assess corrections 4

-Adequacy DecisionDoes code meet

-.. adequacy standard?

YesW Perform plant event analyses

Evaluation Model Development and Assessment Process (EMDAP)

Regulatory Guide 1.203, "Transient and Accident Analysis Methods," U.S. Nuclear Regulatory Commission, December 2005.

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NRELAP5 Validation Matrix

Subsection of NRELAP5 validation matrix for LOCAs

Testing isused tovalidateimportant

PIRTphenomenaandprocesses.

Tests areselected tocover theplant range ofapplicability.

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lET PIRT Phenomena

PIRT phenomena targeted for NIST facility

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Key Points" NIST test data plays an important role in validating NRELAP5 and providing

integrated plant response information on key phenomena and processesassociated with the NuScale plant:

- natural circulation normal operation

- natural circulation passive core cooling systems

- reactor pressure vessel (RPV), containment (CNV), and cooling pool interactions

- emergency core cooling system (ECCS) operation/actuation

" Instrumentation is incorporated in NIST to characterize targeted phenomena.

- significant 3X increase in instrumentation planned for NIST-1 upgrade

• A decay heat removal system (DHRS) will be added to NIST-1 to addressimportant PIRT phenomena and to characterize system interaction effects.

* Final LOCA PIRT rankings will be informed by testing and analysis.

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Section 5 - Overview of ScalingAnalys is for the NIST-1 Test

Facility

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Scaling Introduction

" NuScale has used its Dynamical System Scaling (DSS)Methodology to obtain the geometric and operatingparameters for the NIST-1 facility.

" This NIST-1 scaling analysis provides an application ofDSS that can be used to support the review andapproval of its scaling methodology topical report.

Dynamical System Scaling (DSS) Methodology, NP-TR-1010-867-P, Revision I was issued to the NRC in February 2011 (ML110680401, Project 0769).

" NIST-1 Scaling Analysis report will be issued to NRC inDecember 2014 as a Technical Report.

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NIST-1 Facility Scaling Analysis Report Objectives

To develop a properly scaled test facility, the following specificobjectives must be met for each operational mode of interest.

" The thermal hydraulic processes that should be modeled must beidentified.

" The similarity criteria that should be preserved between the testfacility and the full-scale prototype must be obtained.

" The priorities for preserving the similarity criteria must be established.

" Specifications for the test facility design or modifications must beprovided.

" Biases due to scaling distortions must be quantified.

" The critical attributes of the test facility that must be verified to meetQuality Assurance requirements must be identified.

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NIST-1 Scaling Analysis Report Outline

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NuScale System Breakdown into Hierarchical Levels

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Key Scale Factors for the NIST-1 Facility

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Summary and Conclusions

" DSS methodology has been applied to the design of NIST-1facility.

" The NIST-1 Scaling Analysis report provides an application ofDSS that can be used to support the review and approval of itsscaling methodology topical report:

- Dynamical System Scaling (DSS) Methodology, NP-TR-1010-867-P,Revision I was issued to NRC on February 2011 (ML 110680401, Project0769)

" The NIST-1 Scaling Analysis will be issued to the NRC inDecember 2014 as a technical report.

" The key scale factors have been obtained and have beenapplied to the test facility upgrade.

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Section 6 - NIST Upgrade andCapabilities

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Current Integral Systems Test Facility

* NuScale technology in developmentsince 2000 (DOE) MASLWR program,lessons from AP1000 1A-scale testing

* Electrically-heated, 1/3-scale integraltest facility first operational in 2003

* NQA-1 program instituted in 2012

- completed testing° facility characterization runs (pressure drop,

heat loss, etc.)

* LOCA runs complete

° long-term core cooling runs complete

° steam condensation (270 psig, separateeffects)

Current NuScaleIntegral Systems

Test (NIST) Facility

An upgraded facility will enable new types of transients, more prototypic testing, and

will produce higher fidelity data.

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NIST-1 Facility UpgradeUpgrade Objective: Provide awell-scaled representation ofNuScale's current reactor designthat minimizes distortions andprovides the measurementsnecessary for safety code andreactor design validation

Replace containment and reactorpool moduleModify portions of integral reactorvessel

Add DHRS

pool w/laserview ports

ECCS valvelines

DHRS(in pool)

steam line forseparateeffectscondensationtests

.high pressurecontainment

taller flangedpressurizer

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Increase (3X) instrumentation forphenomena capture and validationNew control room & data acquisitionand control system (DACS) 77ýýý7

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New Containment and Cooling Pool

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Highly instrumentedheat transfer plate

- increaseinstrumentation usedto characterize heattransfer fromcontainment to pool

• Cooling pool viewports

- allow Particle ImageVelocimetry (PIV)measurements tocharacterize localvelocities near theheat transfer plate

* DHRS

- add ability tocharacterize theDHRS performanceunder varied DHRSand pool inventories

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Upgrade Instrumentation

" Increased thermocouple (T/C)density to capture thermalprofiles and gradients

" New EGGS flow measurements

" Additional and enhancedpressure drop measurements tocharacterize losses

" New measurement capabilitiesto capture additional phenomenaand processes (PIV in pool,DHRS)

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Data Acquisition and Control System

* State of the art data acquisition and control system

- log all actions and events affecting the facility

- ability to perform precisely timed and sequenced control actionsduring test operations

- multi-display interface for users to monitor and control operation ofthe NIST facility

- interface with almost 500 instruments

- visual indications of alarm conditions

- automatically initiate control actions (trips) to prevent unsafeoperations

- initiate facility shutdown actions if an emergency stop button is

actuated

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New Control Room

" Dedicated control room for NIST-1 operations

- current control room is shared space with APEX control room

" Multi-display interface for users to monitor and control operation of theNIST-1 facility

° Data analysis, evaluation, and reporting stations

" Secure access and controls for NuScale Proprietary Class I data

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Upgrade Project Schedule

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Section 7 - Testing Completedand Planned for DCA

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Tests Completed - Current Facility

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NIST-1 Testing after Upgrade

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N IST-I Test Matrix (Subject to Change)

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ECCS Valve Fails Open - Objectives and Description

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All ECCS Valves Fail Open - Objectives and Description

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Long-Term Cooling - Objectives and Description

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High Pressure Condensation - Objectives and Description

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Cooling Pool Convection - Objectives and Description

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Non-LOCA Transients Under Consideration -Objectives and Description

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Section 8 - RELAP5-3D NISTPredictions

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Lessons Learned

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Lessons Learned continued

" No core uncovery measured in test or predicted for anyLOCA scenarios

" Steam condensation in the containment is not of highimportance relative to core cooling figures of merit

- 2X change in HTCO value changes peak pressures by -5%

" RELAP5-3D is an appropriate tool in predicting theintegral system behavior of NIST

- contains the essential models and correlations to represent theimportant phenomena and processes occurring in NIST

- limited code development needed for NIST

- few special process models required (i.e., no accumulators, no

separators, no primary pump)

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NIST RELAP5-3D Model Nodalization

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Comparisons

" Primary pressure drop characterization

" RVV fails open, no ECCS activation

" RW fails open, with ECCS activated

* All ECCS valves fail open simultaneously

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Primary Pressure Drop Test Initial Conditions

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Primary Pressure Drop Test

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RW Open / No ECCS Test Initial Conditions- - S T11 Sm= ýi Steady-Stat V-. f . .V f

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RW Open/ No ECCS Test Sequence of Events

I Event I Time (s) I

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RWV Open with ECCS Test Initial ConditionsSed-SaeVlefo

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RW Open with ECCS Test Sequence of Events

I Event j Time (s)

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RVV Open with ECCS Test- {{ }}3(a)-(c)

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All ECCS Valves Open Test Initial Conditions

NIST ~ ~ ~ ~ ~ ~ ( Stay-tt Vau Stad -Stt Vaufo

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All ECCS Valves Open Test Sequence of Events

I Event I Time (s)

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All ECCS Valves Open Test- {{ }}3(a) and (b)

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Key Points

" A major test facility upgrade is in progress that will be complete at theend of this calendar year with testing resuming in February 2015.

" This upgrade aligns the NIST test facility with the NuScale reactordesign.

* Additional instrumentation will be included to characterize thosephenomena and processes identified as important in the LOCA PIRTand targeted for evaluation in the NIST facility.

" NuScale's proprietary Dynamical System Scaling methodology wasused to

- obtain the scaling factors used to design the NIST upgrade

- provide similitude for key LOCA phenomena and processes

- identify and minimize testing distortions

" Final LOCA PIRT rankings will be informed by NIST testing andanalysis.

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Insights and Lessons Learned

" RELAP5-3D contains the essential models and correlations necessary torepresent the important phenomena and processes observed at NIST thatinfluence integral system behavior.

" One-dimensional test facility modeling using RELAP5-3D captures the test

data trends and magnitude.

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" Core uncovery has not occurred for any design basis LOCA scenarios testednor has it been predicted. Accordingly, core heat-up for LOCAs is notanticipated.

" Steam condensation heat transfer in the containment is well predicted by theexisting RELAP5-3D correlation up to 270 psig.

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NRC Feedback" Questions and comments?

" Gain alignment regarding the scope of future testing and the scopeand timeline of the ongoing facility upgrades

" Identify and discuss any potential additional tests to support DesignCertification:

- discuss completeness of NIST test matrix for code validation

- discuss relationship between LOCA PIRT and test matrix

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•N USCALEPOWERT

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1100 NE Circle Blvd., Suite 200Corvallis, OR 97330541.360.0500

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htta://www. nuscalepower. com

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