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:
ing using a program of monitoring, feedback and corrective action to address significant uncertainties. * The use of CDF and LERF as bases for probabilistic risk assessment guidelines is an acceptable approach to addressing Principle 4. Use of the Commission's Safety Goal qualitative health objectives (QHOs) in lieu of LERF is acceptable in principle and licensees may propose their use. However, in practice, implementing such an approach would require an extension to a Level 3 PRA, in which case the methods and assumptions used in the Level 3 analysis, and associated uncertainties, would require additional attention. * Increases in estimated CDF and LERF resulting from proposed changes are limited to small increments. The cumulative effect of such changes should be tracked and considered in the decision process. * The acceptability of the proposed changes is evaluated in an integrated fashion that ensures that all principles are met. * Data, methods, and assessment criteria used to support regulatory decisionmaking are clearly documented and available for review. B. IMPLEMENTATION, PERFORMANCE MONITORING, AND CORRECTIVE ACTION 1. Program Implementation The following implementation activities are acceptable: * For components that will be tested in accordance with the test frequency and methods required by the ASME Code, no specific implementation schedule is required. The test frequency and method should be documented in the licensee's RI-IST Program Plan. * For components that will be tested in accordance with NRC-endorsed ASME Code Cases, implementation of the revised test strategies should be documented in the licensee's RI-IST Program Plan. * Alternate test strategies proposed by the licensee (i.e., for components within the scope of the current ASME Code), should be specifically approved by the NRC. 3.9.7-1 3 Rev. 0-August 1998 The licensee should increase the test interval for components in a step-wise manner (i.e., equal or successively smaller steps, not to