Document: NUREG-0800
Document ID: 05908428-2f08-4a4f-8512-996c29c86da8
Document Type: srp
Title: have been revised to address Addendum B of the ASME standard and the revised NEI
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0717/ML071700657.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.1
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irm 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 Technical Adequacy of the PRA Required by the Application The parts of the PRA required by the application are to be assessed for technical adequacy. Implementation of Regulatory Guide 1.200 should obviate the need for staff review of the base PRA for a risk contributor (e.g., internal events, internal fires, external events) for which a standard and a corresponding appendix to Regulatory Guide 1.200 exist. A staff review of those PRAs for the risk contributors significant to the decision and for which no standard has been endorsed in Regulatory Guide 1.200 will be necessary to the extent needed to support the decision. However, even for the risk contributors addressed by standards, the staff may, under certain circumstances, decide to perform an audit to verify the technical adequacy of the PRA. An audit may be initiated for a number of reasons, some of which are identified below: • Lack of evidence that the self-assessment actions2 that are most relevant to the application have been adequately performed. • Concerns about the resolution of peer review findings associated with the technical requirements that are most relevant to the application. • Contributors (e.g., accident sequences, cutsets, operator actions) to the results that differ from those seen at other, similar plants, and for which no plant specific design features can be identified that would explain the differences. • Results that seem to be