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:
erences in insights or masking of risk as being appropriate for the plant. SFR-E4 -------------------- No objection -------------------- SFR-E5 The SR (CC I and II) refers to SPR-B6 for identification purposes. SPR-B6 discusses “relay or other similar devices”. To capture these items, this SR also needs to apply to “other similar Clarification For CCI: ESTIMATE contact-chatter seismic fragilities for relays or other similar devices that are identified in the systems analysis. (See SPR-B6.) For CCII: DG-1362, Appendix B, Page B-18 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 devices” to prevent any implication that “other similar devices” need not be considered here. Additionally, the action verb for the second part of the CC II requirements needs to be capitalized to identify it. CALCULATE contact-chatter seismic fragilities for relays or other similar devices that are identified in the systems analysis (see SPR-B6) that significantly contribute to seismic core damage frequency and/or seismic large early release frequency. SFR-E6 For CC II: The action verb for the second part of the CC II requirements needs to be capitalized to identify it. Calculate is the appropriate action verb to be used for this supporting requirement. Qualification CALCULATE seismic fragilities for credible seismic-induced flood sources (see SFR-D5) and seismic-induced fire sources (see SFR-D6) that significantly contribute to seismic core damage frequency and/or seismic large early release frequency. For those flood and fire sources that do not significantly contribute to seismic core damage frequency and/or seismic large early release frequency, estimate ESTIMATE the seismic fragilities. Table