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:
-informed decisions to be made using then available methods until all the necessary guidance documents were developed and implemented. SECY-07-0042, “Status of the Plan for the Implementation of the Commission’s Phased Approach to Probabilistic Risk Assessment Quality,” dated March 7, 2007 (Ref. 20), updated the staff’s plan. Since issuance of the 1995 NRC policy statement, many applications have been implemented or undertaken in risk-informed regulatory activities, including modification of the NRC’s reactor safety inspection program and initiation of work to modify reactor safety regulations. Fundamentally, the staff must have confidence that the information developed from a PRA is sound, reliable, complete, and accurate and that it produces insights with appropriate fidelity to support anticipated risk-informed activities. As a result, the sufficiency of a PRA’s technical content determines the acceptability of a PRA and its results. PRA acceptability describes the ability of a PRA to support risk-informed regulatory decision-making and is defined in terms of meeting the NRC regulatory positions in Section C of this RG, which can be satisfied by meeting the requirements of national consensus PRA standards and peer review processes, as endorsed by the NRC. Because consensus PRA RG 1.247, Page 10 standards use the terms “requirement,” “require,” and other similar mandatory language, the staff’s endorsement, including exceptions, mirrors this language. However, the use of this language in this RG does not imply that the RG imposes any regulatory requirement or suggest that these standards are the only way to meet the statutory and regulatory requirements. In general, national consensus PRA standards provide one set of minimum requirements that can be met, as endorsed by the NRC with exceptions, for a PRA to be considered acceptable. These consensus standards include both technical and process-related requirements, such as those related to peer