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:
ndard to meet regulatory position C.1. To demonstrate acceptability of the PRA, a peer review is needed to determine if the intent of the requirements in the national consensus PRA standard is met, as endorsed by the NRC staff with exceptions and clarifications, so that it can be demonstrated that the base PRA model is in conformance with regulatory position C.1. Regulatory position C.2.2 of this RG provides the staff position on the use of PRA peer reviews to this effect, including staff endorsement, with exceptions and clarifications, of related industry PRA peer review guidance. When the peer review accounts for regulatory position C.2.2 and the PRA is assessed against a national consensus PRA standard consistent with regulatory positions C.1 and C.2.1, including staff exceptions and clarifications, the PRA is considered to be acceptable by the NRC staff for supporting that risk-informed regulatory application. 2.1 National Consensus PRA Standards In general, if a national consensus PRA standard is used to demonstrate conformance with regulatory position C.1, the national consensus PRA standard should be based on a predetermined set of DG-1362, Page 39 principles and objectives. Table 16 provides an acceptable set of principles and objectives that were established and used by ASME and ANS in development of their PRA standards. Table 16. Principles and Objectives of a National Consensus PRA Standard 1. The PRA standard provides well-defined criteria against which the strengths and weaknesses of the PRA may be judged so that decision-makers can determine the degree of reliance that can be placed on the PRA results of interest. 2. The standard is based on current good practices as reflected in publicly available documents. The need for the documentation to be publicly available follows from the fact that the standard may be used to support safety decisions. 3. To facilitate the use of the standard for a wide range of applications, categories can be defined to aid in