ML24092A413
| ML24092A413 | |
| Person / Time | |
|---|---|
| Site: | 99902049 |
| Issue date: | 04/01/2024 |
| From: | Lietwiler C Holtec, SMR |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML24092A410 | List: |
| References | |
| 160-USNRC-078 | |
| Download: ML24092A413 (1) | |
Text
www.holtec.com www.smrllc.com SMR-300 Deterministic Safety Analysis Codes and Methods Overview April 10, 2024 Presented by: Clay Lietwiler SMR, LLC, A Holtec International Company Krishna P. Singh Technology Campus One Holtec Boulevard Camden, NJ 08104, USA
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holtec.com l smrllc.com l Page 2 Meeting Agenda
Introductions
Purpose and Outcomes
Background
Computer Codes Basis Validation Plans Methods Event Identification and Classification Acceptance Criteria Single Failures LOCA Methods Non-LOCA Methods Summary and Next Steps
holtec.com l smrllc.com l Page 3
Introductions
NRC Staff Holtec Staff
holtec.com l smrllc.com l Page 4 Purpose and Outcome PURPOSE: To provide a high-level overview of the computer codes and methods used to perform transient and accident analyses.
OUTCOME: To obtain feedback from the NRC staff and identify specific topics that the NRC would like to discuss further in future meetings.
holtec.com l smrllc.com l Page 5 Background - Reactor Coolant System SMR-300 reactor coolant system (RCS) components:
Once-through steam generator (OTSG) 2 cold legs (24 diameter) 2 reactor coolant pumps 2 hot legs (24 diameter)
Integral pressurizer to OTSG 69 standard 17x17 fuel assemblies RCS operating conditions similar to existing PWRs RCS Pressure - 2250 psia RCS Tavg - 578 F RCS Coolant Flow Rate 12,000 lb/s 1050 MWth
holtec.com l smrllc.com l Page 6 Background - Engineered Safety Features All ESF systems are passive and do not require operator action All ESF systems are designed such that a single failure does not inhibit an ESF system from performing its intended function Plant Safety System (PSS)
Initiates reactor trip and actuates ESF systems Primary Decay Heat (PDH) removal system Provides core cooling to RCS primary Secondary Decay Heat (SDH) removal system Provides core cooling via the OTSG Automatic Depressurization System (ADS)
Enables passive safety injection during LOCA Passive Core Makeup (PCM) water system Provides RCS makeup inventory during LOCA Passive Containment Heat (PCH) removal system Ultimate heat sink for LOCA and non-LOCA events
holtec.com l smrllc.com l Page 7 Computer Codes Bases SMR-300 has materials, components, and operating conditions similar to licensed/operating PWR nuclear power plants, therefore computer codes used for analyses of these plants are generally applicable to the SMR-300.
Neutronics Studsviks CMS5 Suite - CASMO5, SIMULATE5, SIMULATE-3K
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Subchannel Analysis Framatomes COBRA-FLX System Thermal Hydraulics Idaho National Laboratorys (INL) RELAP5-3D Containment (Chapter 6.2)
Electric Power Research Institutes GOTHIC Radiological Consequences Source Terms - SCALE Dispersion Factors - ARCON96 Dose - RADTRAD
holtec.com l smrllc.com l Page 8 Generic Computer Code Validation Plan The Evaluation Model Development and Assessment Process (EMDAP) described in Regulatory Guide 1.203 will be followed for each computer code Holtec will leverage existing validation work where applicable
holtec.com l smrllc.com l Page 9 Studsvik CMS5 Validation Plan
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holtec.com l smrllc.com l Page 10 COBRA-FLX and CHF Validation Plans
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holtec.com l smrllc.com l Page 11 RELAP5-3D Validation Plan
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holtec.com l smrllc.com l Page 12 GOTHIC Validation Plan
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holtec.com l smrllc.com l Page 13 SMR-300 Experimental Facilities
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holtec.com l smrllc.com l Page 14 Methods - Event Identification & Classification
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holtec.com l smrllc.com l Page 15 Methods - Acceptance Criteria
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holtec.com l smrllc.com l Page 16 Methods - Single Failures
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holtec.com l smrllc.com l Page 17 Methods - LOCA
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holtec.com l smrllc.com l Page 18 NON-LOCA METHODS
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holtec.com l smrllc.com l Page 19 Summary Deterministic safety analysis codes and methods will adhere to regulations and follow guidance outlined by NRC An SMR-300 specific ISET program is being developed to support LOCA and non-LOCA EMDAP
holtec.com l smrllc.com l Page 20 Open Forum