Document: NUREG-0800
Document ID: b07c8dd1-23f6-41f1-a3ba-aa378f9ea59a
Document Type: srp
Title: RISK-INFORMED INSERVICE INSPECTION
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0325/ML032510135.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.8
CFR Part: 
CFR Title: 

Content:
in risk, and their cumulative effect, are small and do not cause the NRC Safety Goals to be exceeded. Regulatory Guides 1.174 and 1.178 provide guidance for the performance of this evaluation. III.2.1 Traditional Analysis The engineering analyses are reviewed to ensure that the impact of the proposed ISI changes is consistent with the principles that defense in depth and adequate safety margins are maintained in accordance with the acceptance criteria in subsection II.2.1. The reviewer verifies that the proposed changes to the ISI program meet or exceed the intent of ASME B&PVC Section XI to identify conditions that are precursors to leaks and ruptures and that the ISI program provides plans for additional and more frequent inspections in response to detection of flaws and degradation mechanisms. The reviewer ensures that the licensee has demonstrated that there is no impact of the proposed changes in the ISI program on the augmented inspection programs for IGSCC (Category B-G) and FAC. III.2.2 Probabilistic Risk Assessment The PRA performed is reviewed in accordance with the acceptance criteria in Section II.2.2 to confirm that it realistically reflects the actual design, construction, and operational practices and reflects the 1In April 2000, the Nuclear Energy Institute submitted a process (Letter to S.J. Collins, NRC) for peer review of licensee PRAs. It was submitted for staff review in the context of its use in categorizing structures, systems, and components with respect to special treatment requirements (i.e., supporting NRC’s risk-informed Proposed Rulemaking To Add New Section 10 CFR 50.69, "Risk-Informed Categorization and Treatment of Structures, Systems, and Components""Option 2" work (SECY-02-0176)). This process, when endorsed by the NRC, may also be of use in licensing basis changes (as well as other regulatory activities not addressed here); if so, future revisions of this SRP chapter may endorse this certification process for this purpose.