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:
efits. As a general rule, the alternative measures and benefits should be directly linked to the systems or components associated with proposed relaxations. However, on a case by case basis, the staff may also assess the licensee's proposed improvements made to the test strategy for a group of components against proposed relaxations in test requirements for another group of components in assessing the overall acceptability of a proposed RI-IST program. For example, the risk increase associated with relaxation of requirements for a group of low safety significant components may be deemed acceptable in light of improvements made to a group of more high safety significant components on the basis of quantitative or qualitative arguments on the overall change in risk. The factors considered by the licensee's integrated decisionmaking process, as well as the basis for the licensee's integrated decisionmaking process conclusion, should be clearly documented. The reviewer should evaluate this documentation to see whether there is adequate technical justification for the licensee's decisions. Finally, review of the integrated decisionmaking process should include an evaluation of the licensee's proposed implementation, monitoring and corrective action program, and how this program is used to complement the risk analysis (monitoring for unexpected failure mechanisms), the defense in depth analysis (in terms of prevention of common cause failures), and the analysis of safety margins (trending of component performance relative to the margins to failure). Guidance for this review is provided in Sections III.B.1 through lll.B.3. Additional review guidance for the licensee's integrated decisionmaking process is presented in Appendix B and in Section C.2 of Appendix C of SRP Chapter 19. B. REVIEW OF IMPLEMENTATION, PERFORMANCE MONITORING, AND CORRECTIVE ACTION 1. Program Implementation The reviewer should check the adequacy of the justification for extending the test interval for a