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:
fication It is assumed: • Relative to the systems-analysis requirements contained herein, the seismic PRA analysis team possesses a full-scope internal events, at-power Level 1 and Level 2 LERF PRA, developed either before or concurrently with the seismic PRA. • The internal-events PRA is then used as the basis for the seismic PRA systems analysis. It is recognized that the capability and completeness of the seismic PRA is a function of the capability and completeness of the internal events at- power PRA. Introductory text, Issue 2 The sentence reads like a “how to” which is not the intent of the Standard. Further, none of the references cited in the Section are endorsed by the staff. Such references should be moved to the NMA portion of the Standard. Clarification A general methodology for the modeling and quantification of a seismic PRA is documented in references such as EPRI- 3002000709 [5-5], EPRI-1020756 [5-6], and EPRI-1025294 [5-7]. Introductory text, Issue 3 Cross-references in SFR to SPR (ensure that they also are in SPR). - SPR-B4 includes the reference to SFR-A2 Clarification Include the missing cross-references either in the requirements or footnotes. DG-1362, Appendix B, Page B-20 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 - SPR-B5 includes the reference to SFR-C1 - SPR-C4 does not cross-reference SFR- D6 - SPR-D does not cross- reference SFR-D7 Table 5-2.3-1 HLR-SPR-A through HLR-SPR-C -------------------- No objection -------------------- HLR-SPR-D The term “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