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:
- RG 1.247, Appendix A, Page A-22 Table A-9. Staff Position on ASME/ANS RA-S-1.4-2021, Technical Requirements for Internal Flood Analysis Index No. Issue Position Resolution Section 4.3.8 Section text ------------------------ No objection ---------------------------------- Section 4.3.8.1 Section text ------------------------ No objection ---------------------------------- Table 4.3.8.1-1 HLR-FLPP-A through HLR-FLPP-C ------------------------ No objection ---------------------------------- Table 4.3.8.1-2 FLPP-A1 ------------------------ No objection ---------------------------------- Table 4.3.8.1-3 FLPP-B1 through FLPP-B5 ------------------------ No objection ---------------------------------- FLPP-B6 A walkdown should be performed for post-operational plants as part of an investigation. However, a physical walkdown of a plant in the pre-operational phase of development may not always be possible. Performing an investigation that involves something less than a walkdown for post-operational plant may result in a mischaracterization the plant's as-built design in the PRA. Clarification EVALUATE the Internal Flood Plant Partitioning for the as- built, as-operated or as- designed, as-intended-to- operate plant conditions via walkdowns or, for PRAs performed during the preoperational phase, investigation(s) depending… FLPP-B7 through FLPP-B8 ------------------------ No objection ---------------------------------- Table 4.3.8.1-4 FLPP-C1 A walkdown should be performed for post-operational plants and should not Clarification … (b) the general nature and key or unique features of the RG 1.247, Appendix A, Page A-23 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