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:
hing a lower-bound magnitude for use in the hazard analysis. DG-1362, Appendix B, Page B-8 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 2.1 and combined operating license (COL) and early site permit (ESP) applications no longer use the CAV damage parameter in place of a lower-bound magnitude. NRC staff’s related letter pursuant to Title 10 of the Code of Federal Regulations (10 CFR) Section 50.54(f) specified use of M5 (moment magnitude 5) as an appropriate lower- bound magnitude. Table 5-2.1-3 Introductory text -------------------- No objection -------------------- SHA-B1, SHA-B2 -------------------- No objection -------------------- SHA-B3 Sole use of term “attenuation” in conjunction with modeling ground motions is unnecessarily limiting. Clarification ENSURE that the data and information are sufficient to characterize attributes important for modeling both regional propagation attenuation of ground motions and local site effects including their associated uncertainties. SHA-B4 -------------------- No objection -------------------- SHA-B5 The current language requires a demonstration that the updated earthquake catalog has been reviewed if an existing PSHA is used. However, this does not include accounting for the impact of the updated earthquake catalog on the existing PSHA. Clarification If an existing PSHA is used, DEMONSTRATE that an updated catalog of earthquakes was reviewed in the evaluation to determine if does not make the existing PSHA remains unviable. Notes -------------------- No objection -------------------- Table 5-2.1-4 Introductory text -------------------- No objection -------------------- DG-1362, Appendix B, Page B-9 Table B-1. Staff Position on