Document: NRC Regulatory Guide
Document ID: cde52d5a-adf9-49be-9d1f-59449dfca895
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:
. Performing an investigation instead of a walkdown when a walkdown is possible may result in a mischaracterization the plant response in the PRA. Clarification … CONFIRM the accuracy of information collected from plant information sources for the as-designed, or as-built, or as-operated and as-intended-to- operate plant conditions via walkdowns or, for PRAs performed during the preoperational phase, investigation(s)… FLSO-A8 through FLSO-A9 ------------------------ No objection ---------------------------------- Table 4.3.8.2-3 FLSO-B1 through FLSO-B3 ------------------------ No objection ---------------------------------- Section 4.3.8.3 Section text ------------------------ No objection ---------------------------------- Table 4.3.8.3-1 HLR-FLSN-A and HLR-FLSN-B ------------------------ No objection ---------------------------------- Table 4.3.8.3-2 FLSN-A1 through FLSN-A18 ------------------------ No objection ----------------------------------- FLSN-A19 A walkdown should be performed for post-operational plants and should not Clarification EVALUATE the accuracy of information collected from plant information sources for the as-designed, or as-built, and RG 1.247, Appendix A, Page A-25 Table A-9. Staff Position on ASME/ANS RA-S-1.4-2021, Technical Requirements for Internal Flood Analysis Index No. Issue Position Resolution be replaced with an investigation. However, a physical walkdown of a plant in the pre-operational phase of development may not always be possible. Performing an investigation instead of a walkdown when a walkdown is possible may result in a mischaracterization the plant response in the PRA. as-operated or as-intended-to- operate plant conditions via walkdowns or, for PRAs performed during the preoperational phase, investigation(s) depending… FLSN-A20 through FLSN-A21 ------------------------ No objection ---------------------------------- Table 4.3.8.3-3 FLSN-B1 A walkdown should be performed for post-operational plants and should not be