Document: NUREG-0800
Document ID: e32f0820-4e33-476e-aa36-4ca8c2c64af0
Document Type: srp
Title: Use of Probabilistic Risk Assessment in Plant-Specific, Risk-Informed Decisionmaking:
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0119/ML011940192.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.0
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Content:
information that should be examined to support the evaluation of safety significance include the safety insights developed in licensing documents such as the FSAR, as well as the bases for the plant's Technical Specifications, which may include AOTs, limiting conditions for operation (LCOs), and surveillance requirements (SRs). SRP 19-7 Where available, plant-specific data and operational information should be factored into the definition of the proposed change. Reviewers should consider the way in which the issues at hand are reflected in operational data. Useful insights from plant-specific operating experience can also be obtained from inspections that follow incidents at the facility, including incident investigation and augmented team inspections conducted by the NRC, incident assessments documented in significant operating event reports prepared by the Institute of Nuclear Power Operations (INPO), licensee follow-up investigations, and routine inspections by NRC resident inspectors. Inspection results can provide valuable qualitative insights in such areas as human performance, management controls, adequacy of procedures, and root causes of events, which are often difficult to treat with precision in a PRA. Finally, as part of the initial review of the licensing amendment, reviewers should determine if the submittal adequateily characterizes the impact of the proposed change (specifically, if the submittal identifies all SSCs or other plant elements affected by the proposed change) and if the analyses performed and submitted by the licensees have the scope and depth to adequately characterize the impact of the change. Licensees may submit proposals which include several individual LB changes that have been evaluated and will be implemented in an integrated fashion. For example, individual changes may be grouped together for convenience (ease of implementation and/or review), or changes may be combined as risk tradeoffs (balancing risk increases with risk