Document: NUREG-0800
Document ID: 8e754440-b70e-4b8a-9816-b4a64b631220
Document Type: srp
Title: Initial – February 2012
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1136/ML113640138.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8
CFR Part: 
CFR Title: 

Content:
n: a. RG 1.174, “An Approach for Using Probabilistic Risk Assessment in Risk-Informed Decisions on Plant-Specific Changes to the Licensing Basis,” [Reference 2] describes a risk-informed approach, acceptable to the NRC, for assessing the nature and impact of proposed licensing-basis changes by considering engineering issues and applying risk insights. b. RG 1.177, “An Approach for Plant-Specific, Risk-Informed Decisionmaking: Technical Specifications,” [Reference 3] describes an acceptable risk-informed approach specifically for assessing proposed TS changes in AOTs. c. RG 1.200, “An Approach for Determining the Technical Adequacy of Probabilistic Risk Assessment Results for Risk-Informed Activities.” These RGs also provide PRA quality and acceptance guidelines for evaluating the results of such evaluations. As noted in its approval of the final policy statement on the use of PRA methods (“Use of Probabilistic Risk Assessment Methods In Nuclear Regulatory Activities,” [60 Federal Register 42622]), the Commission stated an expectation that "the use of PRA technology should be increased to the extent supported by the state of the art in PRA methods and in a manner that complements the NRC’s deterministic approach and supports the NRC’s traditional defense-in-depth philosophy." The staff has defined an acceptable approach to analyzing and evaluating changes requested by licensees for AOT extensions. The staff approach supports the NRC’s desire to base its decisions on the results of traditional engineering evaluations, supported by insights (derived from the use of PRA methods) about the risk significance of the proposed changes. Decisions concerning proposed changes are expected to be reached in an integrated fashion, considering traditional deterministic engineering evaluation that is supplemented by risk insights information. As stated in RG 1.177, the licensee should determine how the change impacts defense-in-depth aspects of the plant's