Document: NUREG-0800
Document ID: 7916b088-fb90-4163-84fe-027bd315bcc5
Document Type: srp
Title: REVIEW OF RISK INFORMATION USED TO SUPPORT PERMANENT PLANT-
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0717/ML071700658.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.2
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Content:
n a PRA. Finally, as part of the initial review of the licensing amendment, reviewers should determine if the submittal adequately 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 that 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 decreases). Changes grouped in this way should normally be related, for example by affecting the same single system or activity, the same safety function, or the same accident sequence group, or by being of the same type (e.g., changes in AOT). However, this does not preclude unrelated changes from being accepted. When combined change requests are submitted, the reviewers should conduct a detailed assessment of the relationship between the individual changes and how they have been modeled in the risk assessment. Reviewers should evaluate the acceptability of the individual changes and the overall impact of the combined changes with respect to the principles and expectations discussed in Subsection II of this SRP section. Subsection III.2.3 discusses the review of combined change requests in more detail. III.2 Element 2: Conduct Engineering Evaluations In order to make findings regarding the acceptability of a proposed license amendment, the reviewers should use an integrated assessment of traditional engineering evaluations and probabilistic information. Regulatory Guide 1.174, Section 2.2 describes the specific evaluations that the licensee is expected to perform. The scope and quality of the engineering