Document: NRC Regulatory Guide
Document ID: 8a2332d3-66ca-40af-84e1-507db8b26559
Document Type: regulatory_guide
Title: TRIAL - Acceptability of Probabilistic Risk Assessment Results for Non-Light Water Reactor Risk-Informed Activities
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2123/ML21235A008.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.247
CFR Part: 
CFR Title: 

Content:
uced flood sources (see Requirement SFR-D6) and seismic-induced fire ignition sources (see Requirement SFR-D7) that are risk-significant contributors. RG 1.247, Appendix A, Page A-45 Table A-11. Staff Position on ASME/ANS RA-S-1.4-2021, Technical Requirements for Seismic PRA Index No. Issue Position Resolution plant response. SFR-E6 ------------------------ No objection ---------------------------------- SFR-E7 The sources of uncertainty, related assumptions, and reasonable alternatives for the seismic fragility analysis for pre- operational stage PRAs are not coupled to SR SPR-E8, which determines the impact of the sources of uncertainty on event sequence families and the resulting impact on decisions using the PRA. Merely identifying the sources of uncertainties for pre- operational phase PRAs does not provide sufficient information to determine their impact on the event sequence families and the decisions therefrom. The sources of uncertainty in pre-operational stage PRAs are expected to be different from those during the operational stages. Qualification For PRAs performed during the pre-operational stage, IDENTIFY assumptions made due to the lack of as-built, as- operated details that influence the Seismic Fragility Analysis in a manner that supports Requirement SPR-E8. Table 4.3.10.2.7 SFR-F1 through SFR-F3 ------------------------ No objection ---------------------------------- Section 4.3.10.3 Section text ------------------------ No objection ---------------------------------- RG 1.247, Appendix A, Page A-46 Table A-11. Staff Position on ASME/ANS RA-S-1.4-2021, Technical Requirements for Seismic PRA Index No. Issue Position Resolution Table 4.3.10.3-1 HLR-SPR-A through HLR-SPR-F ------------------------ No objection ---------------------------------- Table 4.3.10.3-2 SPR-A1 through SPR-A4 ------------------------ No objection ---------------------------------- Table 4.3.10.3-3 SPR-B1 through SPR-B13 ------------------------ No objection