Document: NRC Regulatory Guide
Document ID: cde52d5a-adf9-49be-9d1f-59449dfca895
Document Type: regulatory_guide
Title: TRIAL - Acceptability of Probabilistic Risk Assessment Results for Non-Light Water Reactor Risk-Informed Activities
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2123/ML21235A008.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.247
CFR Part: 
CFR Title: 

Content:
feasibility evaluation of operator actions considered for the SPRA. The Clarification EVALUATE potential functional and structural failure mechanisms, equipment anchorage, and support load path., and pathways necessary for performing required ex-control room actions. RG 1.247, Appendix A, Page A-42 Table A-11. Staff Position on ASME/ANS RA-S-1.4-2021, Technical Requirements for Seismic PRA Index No. Issue Position Resolution walkdown information is used not only by fragility analysts but also by plant response analysts. Therefore, such information will inform the plant response analysts about the feasibility of certain operator actions. If this evaluation is not performed during the walkdown, the PRA may include operator actions that would be infeasible due to a necessary path being unavailable and therefore, impact the plant response characteristics and insights. SFR-D6 through SFR-D8 ------------------------ No objection ---------------------------------- Table 4.3.10.2-6 SFR-E1 and SFR-E2 ------------------------ No objection ---------------------------------- SFR-E3 The applicability of generic data to a given SSC should be justified. This is because of the potential for SSCs in NLWR designs that may not correspond to established SSC categories and/or may not be in common SSC locations in the plant. When estimating fragilities for PRAs developed for the pre- Clarification CC-I ESTIMATE conservative seismic fragilities for the failure mechanisms of interest identified in Requirement SFR- E1 using plant-specific data, or JUSTIFY the use of generic fragility data (e.g., fragility test data, generic seismic qualification test data, and earthquake experience data) or conservative assumptions for the SSCs as being applicable to the SSC and appropriate for RG 1.247, Appendix A, Page A-43 Table A-11. Staff Position on ASME/ANS RA-S-1.4-2021, Technical Requirements for Seismic PRA Index No. Issue Position Resolution operational phase, demonstrating that generic or