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:
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 PRA Quality” (Ref. 26), which presents the staff’s approach to defining the needed PRA quality for current or anticipated applications, as well as the DG-1362, Page 6 process for achieving this quality, while allowing risk-informed decisions to be made using currently available methods until all of the necessary guidance documents are developed and implemented. SECY-07-0042, “Status of the Plan for the Implementation of the Commission’s Phased Approach to Probabilistic Risk Assessment Quality” (Ref. 27), provides an update to the staff plan. Since the 1995 NRC policy statement, many applications of PRA 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 and reliable. Consequently, the PRA technical content needs to be complete, correct, accurate, and produce insights with appropriate fidelity to support any decision contemplated. As a result, the sufficiency of technical content of the PRA determines the acceptability of a PRA.1 PRA acceptability describes the ability of a PRA to support risk-informed regulatory decisionmaking and, for a base PRA, is defined in terms of the NRC regulatory position in Section C this RG, national consensus PRA standards requirements, and peer review processes. These three aspects each depend on the other to achieve PRA acceptability, as illustrated in Figure 1. Figure 1. NRC general framework for achieving PRA acceptability National consensus PRA standards provide one set of minimum requirements that can be met, as endorsed by the staff with exceptions and clarifications, for a base PRA to be considered