Document: NRC Regulatory Guide
Document ID: 22ccfd5e-c5d8-4615-a02c-32369aa9f533
Document Type: regulatory_guide
Title: Acceptability of Probabilistic Risk Assessment Results for Risk-Informed Activities (Rev. 3)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1930/ML19308B636.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.200
CFR Part: 
CFR Title: 

Content:
“operator performance” can be interpreted in a narrow context to mean only in- control room actions and performance. However, the HLR and the corresponding SRs are applicable to all human actions included in the SPRA. Clarification Human actions credited in the seismic PRA shall consider seismic-specific challenges to operator performance actions included in the seismic PRA. HLR-SPR-E -------------------- No objection -------------------- HLR-SPR-F This HLR is overly broad since HLR-SHA-J and HLR-SFR-F already address documentation of the seismic hazard evaluation and the seismic fragility evaluation, respectively. Clarification Documentation of the seismic PRA analysis plant-response model shall be consistent with the applicable supporting requirements. Table 5-2.3-2 Introductory text -------------------- No objection -------------------- SPR-A1 -------------------- No objection -------------------- SPR-A2 It is unclear whether the SR is seeking to identify all possible initiating events from secondary hazards or if the intent is Clarification Using a systematic process, IDENTIFY credible seismically induced initiating events caused by secondary hazards (e.g., seismically induced internal flooding, external flooding, and fire) including those DG-1362, Appendix B, Page B-21 Table B-1. Staff Position on ASME/ANS RA-S Case 1, “Case for ASME/ANS RA-Sb-2013 Standard for Level 1/Large Early Release Frequency Probabilistic Risk Assessment of Nuclear Power Plant Applications,” Technical and Peer Review Requirements of a Level 1, Seismic PRA for the At-Power Operating Mode Index No Issue Position Resolution to identify and screen such initiators for inclusion in the plant- systems model. identified in SHA-I2 for consideration retention in the plant-response analysis and model development process. SPR-A3 The verb “encompasses” is overly severe and cannot reasonably be achieved in practice. The wording of this SR should be similar to IE-A3 and IE-A4.