ML24205A020
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| ML24205A020 | |
| Person / Time | |
|---|---|
| Issue date: | 07/23/2024 |
| From: | Jacqueline Thompson Office of Nuclear Reactor Regulation |
| To: | |
| References | |
| Download: ML24205A020 (8) | |
Text
DG-1290, Revision 1 - Proposed Revision 3 to Regulatory Guide 1.59 Appendix K - Consideration for Applying Guidance to Advanced Reactors and Small Modular Reactors Presentation to Advanced Reactor Stakeholders Meeting July 24, 2024 Jenise Thompson NRR - Division of Engineering and External Hazards 1
Overview
- RG 1.59, Revision 2, issued in 1977
- Revision 3 initially issued for public comment as DG-1290 in 2022, reissued for public comments July 15, 2024
- Appendix K adapts methodology from RG 4.26 to use a flexible stepwise approach to leverage PRA and site characteristics in flood evaluations for advanced reactors and SMRs 2
Adapting from RG 4.26
- Leverage existing site characterization information
- Screen hazards and consider risk insights
- Allow for evaluation of SSC performance and mitigating actions in addition to or in place of detailed hazard analysis RG 4.26, Figure 3 3
RG 4.26, Figure 3 DG-1290, Figure K-1 4
Appendix K Flowchart
- Step 1 - leverage site characterization information
- Step 2 - determine which, if any, flood-causing mechanisms affect plant performance
- Step 3 - determine if there is adequate engineering for SSCs to withstand the hazard Figure K-1, DG-1290, Rev. 1 5
Appendix K Flowchart
- Step 4 - evaluate mitigating actions for adequacy
- Step 6 - reassess design features and/or consider PRA
- Step 5 - assessment is complete and results are documented Figure K-1, DG-1290, Rev. 1 6
Appendix K Summary
- Focus on flood causing mechanisms of importance to the design
- End the flood evaluation at the earliest possible point in the process.
- Consider PRA or comparable analysis
- Iterate between evaluation of SSCs performance and mitigating actions and design reassessment to achieve satisfactory result.
Figure K-1, DG-1290, Rev. 1 7
Next Steps
- DG-1290, Revision 1, public comment period open.
- Disposition of first set of public comments - ML23320A026
- DG-1290, Revision 1 - ML23320A025 References 8