Document: NUREG-0800
Document ID: 4e1d86bd-74a5-4678-8bc0-ffce3ba28ea0
Document Type: srp
Title: RISK-INFORMED INSERVICE TESTING
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0428/ML042880272.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.7
CFR Part: 
CFR Title: 

Content:
adjust the test interval of individual LSSC provided it conforms with the process reviewed and approved by the NRC staff or conforms with the process described in an NRC-endorsed ASME Code Case. * The reviewer should verify that requests for relief or proposed alternate testing have been submitted to the NRC for approval. The reviewer should verify that the licensee has submitted technical specification amendment requests for proposed changes that affect the technical specifications. * The reviewer should examine the basis for requests for relief and alternatives and should assess the adequacy of the implementation of the alternative testing. 3.9.7-1 8 Rev. 0-August 1998 5. Scope, Level of Detail, and Quality of the PRA for IST Application Review guidelines for PRA scope, level of detail, and quality are presented in Section 111.2.2 and Appendix A of SRP Chapter 19 (Ref.4) and are summarized below. PRA Scope: Reviewers should ensure that they understand the scope of the PRA, and in particular, what initiating events and operating modes are not represented in the PRA model. It will be necessary to ensure that these missing contributions to risk are treated appropriately in the integrated decisionmaking process. Level of Detail: In RI-IST, the PRA would normally be used for two purposes: to provide input to the categorization of components, and to evaluate the change in risk. Typically, a PRA model will include both safety-related and non-safety-related components. The reviewer should determine that all the components in the LSSC category are either modeled in the PRA and have been treated appropriately, or there are qualitative arguments why they do not contribute to risk. When evaluating the impact of the change on risk, the PRA model has to be sufficiently detailed that the impact of the change on individual components can be accommodated, either because there are events in the model that are in direct correspondence with the affected components, or there is a