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:
nmaking process leading to the proposed change is expected to follow an integrated approach (considering traditional engineering and risk information) and may build upon qualitative factors as well as quantitative analyses and information. As discussed later in this SRP section, the scope of the staff review of a risk-informed application will depend on the specifics of the application. However, this scope should include reviewing the four elements suggested in Regulatory Guide 1.174, Section 2. The areas of review for each of these elements are summarized as follows: • Element 1 - Define the Proposed Change: The objective of this element is to lay the groundwork for evaluating the safety impacts of the proposed change. Therefore, one area of review would be an evaluation of the proposed change in light of the LB (i.e., evaluation of the structures, systems, and components (SSCs), as well as the plant procedures and activities that are affected by the proposed change and how these SSCs, procedures, or activities relate to the LB). In addition, an evaluation of the method of analysis and a study of available insights from traditional and probabilistic engineering studies that are relevant to the proposed change would be necessary to determine if the change can be supported. • Element 2 - Conduct Engineering Evaluations: The licensees' decisionmaking process should factor in the appropriate traditional and probabilistic engineering insights. Reviewers should evaluate the proposed change to ensure that the defense-in-depth philosophy and sufficient safety margins are maintained, and that the calculated change in plant risk is within the guidelines specified in Regulatory Guide 1.174. Reviewers should also verify that insights from the engineering evaluations used to justify a change have been used to improve operational and engineering decisions where appropriate, and not simply to eliminate requirements the licensee sees as undesirable. • Element 3 - Develop