advancements in technology applications for the nuscale
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Advancements in Technology Applications for the NuScale Power I&C Design
June 5, 2018
Brian Arnholt I&C Supervisor / NuScale Power
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Introduction Agenda
‒ Brief Overview of NuScale Plant Design ‒ Introduction to NuScale I&C Architecture
Unique NuScale Differences ‒ NuScale Power Module Sensor Overview ‒ Regulatory Review Update ‒ Future Needs and Challenges
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Each NPM is installed below-grade in a seismically robust, steel-lined, concrete pool
NPMs can be incrementally added to match load growth—up to 12 NPMs for 600 MWe gross (~570 net) total output
A NuScale Power Module (NPM) includes the reactor vessel, steam generators, pressurizer and containment in an integral package that eliminates reactor coolant pumps and large bore piping (no LBLOCA)
Each NPM is 50 MWe and factory-built for easy transport and installation
Each NPM has its own skid-mounted steam turbine-generator and condenser
The NuScale Power Module
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*Source: NRC
NuScale Power Module Combined Containment Vessel and
Integral Reactor System
Typical Pressurized-Water Reactor Containment & Reactor System
Size Comparison
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Simplified NSSS Protection Design
NOT TO SCALE
main steam isolation valves
main feedwater isolation valves
decay heat removal actuation valves
decay heat removal passive condenser
control rod drives
reactor vent valves
steam header
feedwater header
control rods reactor recirculation
valves
reactor pool
containment vessel
reactor pressure vessel pressurizer
upper plenum
steam generators
hot leg riser
reactor core downcomer
lower plenum
safety relief valves
Safety I&C Platform • Digital I&C System • Use of FPGAs allows for diversification
within the safety I&C platform • Passive safety features result in a
simpler safety I&C platform • A simpler and more diversified design
results in a more reliable safety I&C platform
• No safety related pumps or fans to control
• Provide Reactor Trip Breaker and Pressurizer Heater Breaker trip signals
• Provide trip signals to solenoid operated valves
• On “loss of power” solenoids de-energize and associated valves fail in the “safe” position and Reactor Trip and Pressurizer Heater breakers open
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I&C Architecture Overview
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Main Control Room
NuScale 12-Module Control Room Simulator, Corvallis, Oregon
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Challenges Unique NuScale Power Module Design Use of Technology in First-of-a-Kind Applications of Sensors
and Instrumentation Testing, Calibration and Maintenance of I&C components
‒ 12 modules – need for efficient maintenance strategies based upon quantity of I&C components
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First-of-A-Kind Applications The NuScale Power Module utilizes both conventional and
application of First-of-A-Kind Technologies to Light Water Reactors
First-of-a-Kind Reactor Protection System First-of-a-Kind Sensor Applications
‒ Pressure, Level, Flow
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Unique NuScale Design Features Differences Unique differences that impact I&C System Design
Natural circulation as a function of power level ‒ Testing during changing flow conditions between
shutdown and power operations. most of the reactor module is under water during normal
operation and during most of the refueling evolution containment is flooded during refueling vacuum conditions in containment during normal operation volume of containment is significantly smaller than typical
PWR containment no reactor coolant system piping higher containment temperatures during normal operation
and higher containment design-basis event (DBE) temperatures and pressures
higher containment radiation levels during normal operation and higher containment DBE radiation levels
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Sensor Variables Reactor coolant system (RCS) sensors include
‒ narrow and wide range RCS hot temperature
‒ narrow and wide range RCS cold temperature
‒ pressurizer liquid and vapor temperatures
‒ RCS flow
‒ narrow range pressurizer pressure
‒ wide range RCS pressure
‒ pressurizer and reactor pressure vessel (RPV) riser levels
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Sensor Variables Containment (CNT) system sensors include
‒ narrow and wide range CNT pressure
‒ containment water level
‒ containment air temperature
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NuScale Power Module View 000
000 Containment
Assembly Reactor Pressure Vessel
Assembly
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NuScale Power Module Sensor Locations
RCS Temperature Sensors
Reactor Coolant Pressure Sensor
Containment Pressure Sensors
Incore Neutron Flux and
Temperature Sensor
Assemblies
Pressurizer Level Sensors
Containment Level Sensors
Reactor Coolant Flow Sensors
RPV Riser Level Sensors
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Sensor Environment Development of environmental conditions
‒ collaborated with multiple vendors to evaluate sensor technologies and associated environmental conditions
Example environmental conditions
Normal Design Basis
Temperature 295°F (CNV surface temperature)
~550°F (CNV surface temperature)
Pressure -14.6 psig 958 psig
Radiation 6.00x107 rads – neutron 3.01x106 rads - gamma
2.4x109 rads – beta 4.4x109 rads - gamma
NuScale Power, LLC, “Final Safety Analysis Report, Chapter 3,” Revision 1, March, 2018.
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NuScale I&C Licensing Summary NuScale Design Certification Application Submittal December 31, 2016.
‒ Phase 1 review complete.
Module Protection System (MPS) – major focus of NRC review ‒ All Phase 1 RAIs have been completed ‒ Instrumentation and Controls based on NuScale Highly Integrated Protection
System Platform which received NRC Approval on June 6, 2017. ‒ Advanced Sensor Technical Report (TR-0316-22048) describes NuScale
Sensor Technology for Pressure, Temperature, Flow, Level
Module/Plant Control Systems (MCS/PCS) ‒ Common Cause Failures - Segmentation Analysis ‒ Safety classification of control room habitability systems ‒ Post-accident monitoring functions ‒ Interface between protection and control (control of safety-related
components)
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Areas for Future I&C Development Needs
Completion of Prototype Development ‒ Completed
Module Protection System Prototype completed in 2017 RPV Prototype and Flow Sensor testing completed in 2017
‒ In Development Safety Display and Indication System Prototype Prototype Sensors for Key Process Variables: Pressure, Level, Flow, In-core
Neutron Detectors
Testing and qualification of sensor applications in unique environments ‒ In situ calibration and testing ‒ Testing during refueling (module movement) ‒ Replacement, repair and maintenance
Managing evolving cyber security threats ‒ Data storms, insider threats, secure development and operating
environments
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