Document: NUREG-0800
Document ID: 4f0d611c-d3fb-43e5-ab91-e7f7b4de3511
Document Type: srp
Title: Determining the Technical Adequacy of Probabilistic Risk
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0406/ML040630300.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.1
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process in the ASME PRA standard. The reviewer should confirm that the PRA has been revised to reflect any significant changes in design or operational practices (including operating procedures), and that the data used to estimate the parameters are current. This may be achieved by reviewing the licensee’s description of their updating process and ascertaining that the licensee has adequately addressed recent plant modifications and operational changes that could have a significant impact on the results of the specific application that are not reflected in the current PRA model. III.2.2 Assessment of the PRA Required by the Application The parts of the PRA required by the application are to be assessed for technical adequacy. It is expected that a licensee using the standard or peer review process has taken account of the exceptions and clarifications found in the appendices of Regulatory Guide 1.200 and has documented the comparison with the relevant documents as endorsed. The reviewer is to focus on the elements that have deviations from, or discrepancies with, the requirements of the endorsed documents. The reviewer may make a judgment that the deviation or discrepancy leads to an equivalent to the requirements of the endorsed documents. Alternatively, the reviewer may determine that the issue needs to be addressed in the application-specific review, by determining that the licensee has given reasons as to why the discrepancies are not important, or provided a demonstration that the discrepancy has no significant impact on the results used in the decision. III.2.3 Assessment of Engineering Analyses, Assumptions, and Approximations Since the standards and industry PRA programs are not (or are not expected to be) prescriptive, there is some freedom on how to model certain issues in the PRA, so that different analysts may make different assumptions regarding these issues, yet the issues still meet the requirements of the standard or have been accepted by the peer