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:
for changes in the ISI program based on the safety significance of the pipe element, and  A discussion and evaluation of the aggregate risk impact of the set of changes requested in the ISI program, including an evaluation of uncertainty indicating that the uncertainties do not invalidate the conclusions. Alternatively, principle four may be shown to be met by calculating the expected change in CDF and LERF. The expected change can be calculated using the baseline PRA and before change versus after change piping failure potential expressed as failure probabilities. An evaluation of the 3.9.8-12 uncertainty in the results should be performed, which indicates that the uncertainties do not invalidate the conclusions. II.2.3 Integrated Decisionmaking The integrated decisionmaking must address all five key safety principles presented in Section I, “Areas of Review,” in this SRP and should address each of the expectations discussed in Section 2, “An Acceptable Approach to Risk-Informed Decisionmaking,” of Regulatory Guide 1.174. The integrated decisionmaking should also ensure that the proposed ISI program is consistent with the intent of each of the elements related to defense in depth and safety margins discussed in 2.2.1.1, “Defense in Depth,” and 2.2.1.2, “Safety Margins,” of Regulatory Guide 1.174. The results of the different elements of the engineering analysis discussed in Sections I.2.1 and I.2.2 must be considered in an integrated decisionmaking process. For ISI application, traditional requirements are outlined in 10 CFR 50.55a and the General Design Criteria in Appendix A to 10 CFR Part 50. To be acceptable, the traditional engineering analysis should address all the relevant regulations and the licensing bases of the plant. The acceptability of the impact of the proposed change in the ISI program is based on the adequacy of the traditional engineering analysis, acceptable change in plant risk relative to the criteria, and the adequacy of the