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:
ent probabilities when significant (see NOTE 1). Cat III: CALCULATE the mean CDF (and LERF) by … DG-1362, Appendix A, Page A-16 Table A-2. Staff Position on ASME/ANS RA-Sa-2009 Part 2, Technical and Peer Review Requirements for At-Power Internal Events Index No Issue Position Resolution QU-B1 thru, , QU-B5, QU-B7 thru QU-B10 -------------------- No objection -------------------- QU-B6 Need to acknowledge LERF quantification Clarification ACCOUNT for … realistic estimation of CDF or LERF. This accounting … QU-C1 thru QU-C3 -------------------- No objection -------------------- Table 2-2.7-5(d) HLR-QU-D and Table 2- 2.7-2(d) objective statement just before table need to agree; SRs for LERF quantification reference the SRs in 2-2.7 and, therefore, need to be acknowledged in 2-2.7. Clarification …significant contributors to CDF (and LERF), such as initiating events, accident sequences… QU-D1 thru QU-D7 -------------------- No objection -------------------- QU-E1, QU-E2 -------------------- No objection -------------------- QU-E3 Need to acknowledge LERF quantification Clarification Cat I and II: ESTIMATE the uncertainty interval of the CDF (and LERF) results. QU-E4 The note has no relevance to the base model and could cause confusion; it should be deleted. Clarification For each source of model uncertainty … introduction of a new initiating event) [Note (1)]. NOTE: For specific applications, … And in logical combinations. QU-F1, QU-F3 thru QU-F6 -------------------- No objection -------------------- DG-1362, Appendix A, Page A-17 Table A-2. Staff Position on ASME/ANS RA-Sa-2009 Part 2, Technical and Peer Review Requirements for At-Power Internal Events Index No Issue Position Resolution QU-F2 SR needs to use defined term “significant” instead of “dominant.” In addition, there is no requirement to perform sensitivity studies, and therefore, requirement is not needed for documentation. Clarification (g) equipment or human actions that are the key