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

Revision 1

NuScale Nonproprietary Copyright © 2018 by NuScale Power, LLC Template #: 0000-20955-F01 R7

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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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Portland Office 6650 SW Redwood Lane, Suite 210 Portland, OR 97224 971.371.1592 Corvallis Office 1100 NE Circle Blvd., Suite 200 Corvallis, OR 97330 541.360.0500 Rockville Office 11333 Woodglen Ave., Suite 205 Rockville, MD 20852 301.770.0472 Charlotte Office 2815 Coliseum Centre Drive, Suite 230 Charlotte, NC 28217 980.349.4804

Richland Office 1933 Jadwin Ave., Suite 130 Richland, WA 99354 541.360.0500 Arlington Office 2300 Clarendon Blvd., Suite 1110 Arlington, VA 22201 London Office 1st Floor Portland House Bressenden Place London SW1E 5BH United Kingdom +44 (0) 2079 321700

http://www.nuscalepower.com Twitter: @NuScale_Power

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