ML23087A210
| ML23087A210 | |
| Person / Time | |
|---|---|
| Issue date: | 03/28/2023 |
| From: | James Shea NRC/NRR/DNRL/NRLB |
| To: | |
| References | |
| Download: ML23087A210 (1) | |
Text
Risk Insights and Severe Accident Vulnerability Information for LWR CP Applications Division of Risk Assessment, Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission March 30, 2023
Purpose of Meeting
- Describe staffs initiative to develop guidance
- Request feedback 2
We make SAFE use of nuclear technology POSSIBLE.
Background
- Regulations Content of applications (10 CFR 50.34)
Issuance of CPs (10 CFR 50.35)
- Commission Policy Statements Severe Reactor Accidents for Future Designs and Existing Plants Safety Goals for the Operations of Nuclear Power Plants Use of Probabilistic Risk Assessment Methods In Nuclear Regulatory Activities
- Direction Proposed Updates of Licensing Policies, Rules, and Guidance for Future New Reactor Applications (SRMSECY20150002)
- Rulemaking Aligning 10 CFR Parts 50 and 52 (Proposed and Pending) 3 We make SAFE use of nuclear technology POSSIBLE.
Objective of Initiative
- Publish guidance on scope of information and level of detail for risk insights and severe accident information supporting a CP application
- Focus on LWRs, including small modular reactors (SMRs)
- Collaborate with related nonLWR efforts
- Describe risk insights and severe accident information in support of an application commensurate with:
- Design readiness at time of CP application submission
- Risk insights and information to support staff findings
- Overcome misconception that risk insights for CP implies achieving technical acceptability against endorsed PRA Standards
- Determine regulatory vehicle for guidance 4
We make SAFE use of nuclear technology POSSIBLE.
Reason for Staff's Initiative
- Some nearterm applicants stated preference for utilizing 10 CFR Part 50
- Staff identified gap in regulatory guidance for risk insights and severe accident information in CP applications
- No CP applications for nearly 40 years
- Past CP applications predated agencys key PRArelated actions
>> Three Mile Island Action Plan
>> Generic Letter 8820
>> Commissions Policy Statements on Severe Accidents and PRA
- Gap exists regarding content of CP application 5
We make SAFE use of nuclear technology POSSIBLE.
Benefits of Risk Insights in a CP Application
- Safety benefits
- Identify and focus design efforts on risk and safetysignificant items
- Support demonstrating safety of design
- Focused staff review
- Leverage risk insights to focus on risksignificant items
- Benefit demonstrated in Part 52 licensing reviews
- Improve OL application reviews
- Reduced regulatory risk
- Increased effectiveness of review
- Focus staff attention on changes compared to CP application 6
We make SAFE use of nuclear technology POSSIBLE.
Staffs Approach Staff initiated public Designspecific pre meetings application meetings Information sources such as:
Internal Determine necessary
- Regulatory Guide 1.70 deliberations and sufficient
- Regulatory Guide 1.200 Guidance
+ information for
- Standard Review Plan for Chapter 19 document Collaboration insights to support
- DC/COLISG028 with non staff findings
- DNRLISG22001 LWR efforts 7
We make SAFE use of nuclear technology POSSIBLE.
Issues Under Discussion by NRC staff (Feedback Requested)
- Graded level of risk insights and severe accident information for CP application (§ 50.34(a)). Level of detail commensurate with:
- Maturity of the design at CP stage
- Reliance on PRA information for design and licensing decisions
- Finality for any SSCs at CP stage
- Treatment of external hazards.
- Process to ensure PRA and severe accident information continues to reflect changes between CP and OL.
8 We make SAFE use of nuclear technology POSSIBLE.
Next Steps
- Continue communication and engagement
- Additional public meeting late spring 2023
- Encourage designspecific preapplication engagements
- Identify regulatory document for guidance
- Draft guidance for comment by late summer or early fall of 2023 9
We make SAFE use of nuclear technology POSSIBLE.
List of Abbreviations ADAMS Agencywide Documents Access and Management System CFR Code of Federal Regulations COL combined license CP construction permit DC design certification FOAK firstofakind FR Federal Register ISG interim staff guidance LWR lightwater reactor SRM staff requirements memorandum SSC structure, system, and component 10 We make SAFE use of nuclear technology POSSIBLE.
List of References SRMSECY20150002 Proposed Updates of Licensing. Policies, Rules and Guidance for Future New. Reactor Applications, ADAMS ML15266A023 NUREG0660, NRC Action Plan Developed as a Result of the TMI2 Accident, May 1980.
Individual Plant Examination for Severe Accident Vulnerabilities 10 CFR 50.54(f) (Generic Letter No. 88-20), November 23, 1988 Severe Reactor Accidents Regarding Future Designs and Existing Plants; 50 FR 32138, August 8, 1985 Safety Goals for the Operations of Nuclear Power Plants; 51 FR 28044, August 4, 1986 Use of Probabilistic Risk Assessment Methods in Nuclear Regulatory Activities; 60 FR 42622, August 16, 1995 Regulatory Guide 1.70, Standard Format and Content of. Safety Analysis Reports for Nuclear Power Plants, Revision 3, November, 1978 Regulatory Guide 1.200, Acceptability of Probabilistic Risk Assessment Results for RiskInformed Activities, Revision 3, December, 2020 NUREG0800, Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants:
LWR Edition Severe Accidents.
DC/COLISG028, Assessing the Technical Adequacy of the Advanced LightWater Reactor Probabilistic Risk Assessment for the Design Certification Application and Combined License Application, December 2016 DNRLISG22001, Safety Review of LightWater Power Reactor Construction Permit Applications, Interim Staff Guidance, October 2022, ML22189A099 11 We make SAFE use of nuclear technology POSSIBLE.
Questions, Comments, or Feedback 12 We make SAFE use of nuclear technology POSSIBLE.