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:
tablished processes for the review and endorsement of published voluntary consensus standards. On February 8, 2021, ASME and ANS jointly published a voluntary consensus standard for NLWR PRA, ASME/ANS RA-S-1.4-2021, “Probabilistic Risk Assessment Standard for Advanced Non-Light Water Reactor Nuclear Power Plants” (Ref. 16), referred to hereafter as the ASME/ANS NLWR PRA standard, which is endorsed in this RG with exceptions. In May 2021, NEI published industry PRA peer review guidance in NEI 20-09, Revision 1, “Performance of PRA Peer Reviews Using the ASME/ANS Advanced Non-LWR PRA Standard” (Ref. 17), which is endorsed in this RG with no exceptions. Background In 1995, the NRC issued “Use of Probabilistic Risk Assessment Methods in Nuclear Regulatory Activities; Final Policy Statement.” This policy statement encourages the use of PRA in all regulatory matters and states, “the use of PRA technology should be increased to the extent supported by the state- of-the-art in PRA methods and data and in a manner that complements the NRC’s deterministic approach.” Additionally, on July 28, 2000, the staff issued SECY-00-0162, “Addressing PRA Quality in Risk-Informed Activities” (Ref. 17), which describes an approach for addressing PRA quality in risk-informed activities, including identification of the scope and minimal functional attributes of a technically acceptable PRA. Subsequently, on July 13, 2004, the staff issued SECY-04-0118, “Plan for the Implementation of the Commission’s Phased Approach to Probabilistic Risk Assessment Quality” (Ref. 19). This document presented the staff’s approach to defining the quality needed for pending or anticipated applications, as well as the process for achieving this quality, while allowing risk-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