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:
o eliminate the source of the threat or to provide an adequate response; (f) the hazard or hazard group cannot produce a consequence above the value set in RI-A5. RG 1.247, Appendix A, Page A-51 Table A-12. Staff Position on ASME/ANS RA-S-1.4-2021, Technical Requirements for Hazard Screening Analysis Index No. Issue Position Resolution requirement is effectively for qualitative screening, as per SCR-3 in Table 1.10-1. Because item (f) is a quantitative criterion, it should not be included in the list. HS-B6 through HS-B7 ------------------------ No objection ---------------------------------- Table 4.3.11.1-4 HS-C1 through HS-C14 ------------------------ No objection ---------------------------------- Table 4.3.11.1-5 HS-D1 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 a post-operational plant may result in a mischaracterization of the plant’s as-built design in the PRA. Clarification CONFIRM that the basis for the screening out of a hazard or hazard group represents either the as-built, as-operated or as-designed, as-intended-to- operate plant conditions via a walkdown or, for PRAs performed during preoperational phases, as applicable, conditions through data and findings of investigation(s) of the plant (and its surroundings, as applicable to the hazard). Table 4.3.11.1-6 HS-E1 through HS-E4 ------------------------ No objection ---------------------------------- Section 4.3.11.2 Section text ------------------------ No objection ---------------------------------- RG 1.247, Appendix A, Page A-52 Table A-12. Staff Position on ASME/ANS RA-S-1.4-2021, Technical Requirements for Hazard Screening Analysis Index No. Issue Position Resolution Section 4.3.11.2.1 Section text ------------------------ No objection