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:
nts herein and that the evaluation supports conclusions of the following type, to be included in the staffs safety evaluation report: 3.9.7-28 Rev. 0-August 1998 * There is reasonable assurance of PRA adequacy, as shown by the licensee's process to ensure quality, and by a focused-scope review by the staff which shows that the components affect by the RI-IST process and those that are important to the decisionmaking are appropriately modeled. In addition, results are shown to be robust in terms of uncertainties and sensitivities to the key modeling parameters. * The level of detail of the PRA is such that the IST components (and relevant failure modes) that contribute most significantly to the plant's estimate risk are included, and that the system and operator dependencies important to the plant risk are included. * The PRA scope is adequate to provide insights on the plant risk and to provide input to the component categorization process, and limitations in the scope is address in the integrated decisionmaking process. The reviewer should also verify that the information provided supports the following conclusions: * a model for unavailability in terms of fault exposure time exists and was used in the PRA for evaluating the risk significance of extending the selected component test intervals, * the arguments that support the conclusion that no significant degradation will occur are justified or the licensee has considered enhanced testing to the extent needed to substantiate the change. 6. Categorization of Components The reviewer verifies that sufficient information is provided in accordance with the requirements of this SRP section and that the evaluation supports conclusions of the following type, to be included in the staff's safety evaluation report: The licensee's process on the determination of risk importance of components in the RI- IST program is robust in terms of the important PRA modeling techniques, assumptions, and data. In addition, the factors as