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:
ponents. Additional discussion DG-1362, Appendix A, Page A-36 Table A-5. Staff Position on ASME/ANS RA-Sa-2009 Part 5, Technical and Peer Review Requirements for At-Power Seismic Events Index No Issue Position Resolution on this issue can be found in Ref. 31. In the quantification of fragilities and of final risk results, it is important to use as realistic a shape as possible. Semi-site specific shapes, such as those given in NUREG-0098, have been used in the past and are considered may be adequate for this purpose, provided that they are shown to be reasonably appropriate for the site [42]. The uniform hazard response spectrum (UHS) is acceptable for this purpose if it can be shown that the UHS shape is appropriate for the site. unless evidence comes to light (e.g., within the technical literature) that these UHS do not reflect the spectral shape of the site-specific events. Recent developments [42] indicate that these spectral shapes are not appropriate for CEUS sites where high frequency content is dominant at hard rock sites. Table 5-2.1- 9(h) See issue for Table 5- 2.1-1, HLR-SHA-H Clarification When use ... for the intended application. It shall be confirmed that the basic data and interpretations from an existing study are valid. SHA-H See issue for Table 5- 2.1-1, HLR-SHA-H Clarification SHA-H1 Cat I and II: Use of existing studies ENSURE, in light of established current information, the study meets the requirements in HLR- SHA-A thru HLR-SHA-G. Cat III: Use of existing studies not allowed. DO NOT USE existing studies. Table 5-2.1- 10(i) See issue for Table 5- 2.1-1, HLR-SHA-I Clarification A screening analysis ... or the magnitude of hazard consequences, or both. The hazard analysis shall include hazards other than vibratory ground motion if necessary. DG-1362, Appendix A, Page A-37 Table A-5. Staff Position on ASME/ANS RA-Sa-2009 Part 5, Technical and Peer Review Requirements for At-Power Seismic Events Index No Issue Position Resolution SHA-I See issue