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:
Nuclear Regulatory Commission (NRC) staff has reviewed ASME/ANS RA-Sa-2009 against the characteristics and attributes of an acceptable PRA as discussed in regulatory positions C.1 and C.2 in Section C of this RG. The staff’s position on each requirement (referred to in the standard as a requirement, a high-level requirement, or a supporting requirement) in ASME/ANS RA-Sa-2009 is categorized as “no objection,” “no objection with clarification,” or “no objection subject to the following qualification,” and defined as follows: • No objection. The staff has no objection to the requirement. • No objection with clarification. The staff has no objection to the requirement. However, certain requirements, as written, are either unclear or ambiguous, and therefore the staff has provided its understanding of these requirements. • No objection subject to the following qualification. The staff has a technical concern with the requirement and has provided a qualification to resolve the concern. ASME/ANS RA-Sa-2009 PRA standard is divided into 10 parts: • Part 1 ⎯ general requirements • Part 2 ⎯ technical and peer review requirements for internal events • Part 3 ⎯ technical and peer review requirements for internal flood • Part 4 ⎯ technical and peer review requirements for internal fire events • Part 5 ⎯ technical and peer review requirements for seismic events • Part 6 ⎯ technical and peer review requirements for screening of other external hazards • Part 7 ⎯ technical and peer review requirements for high wind • Part 8 ⎯ technical and peer review requirements for external flood • Part 9 ⎯ technical and peer review requirements for other external hazards • Part 10 ⎯ technical and peer review requirements for seismic margins Tables A-1 through A-10 provides the staff’s position on each requirement in Parts 1 through 10, respectively. A discussion of the staff’s concern (issue) and the staff proposed resolution is