Document: NRC Regulatory Guide
Document ID: 47b09be1-4bf8-45f9-a099-7fed871c09bd
Document Type: regulatory_guide
Title: Plant-Specific, Risk-Informed Decisionmaking: Inservice Testing (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2114/ML21140A055.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.175
CFR Part: 
CFR Title: 

Content:
istic engineering data and the PRA-generated information. The licensee should use well-reasoned judgment to resolve the issues in the best manner possible, including due consideration to the safety of the plant. Various industry documents (Refs. 21, 22 and 23) discuss the process of integrated decisionmaking, with reference to the use of an expert panel. The appendix to this RG includes detailed guidance on certain aspects of integrated decisionmaking specific to RI-IST programs. This RG is not intended to suggest that the licensee always form a body, such as an expert panel, to fulfill this function. This section covers some general guidance for this important activity; the appendix to this RG provides more specific details. In summary, acceptability of the proposed change should be determined by using an integrated decisionmaking process that addresses three major areas: (1) an evaluation of the proposed change in light of the plant’s licensing basis; (2) an evaluation of the proposed change relative to the key principles and the acceptance guidelines; and (3) the proposed plans for implementation, performance monitoring, and corrective action. As stated in the Commission’s policy statement on the increased use of PRA in regulatory matters, the PRA information used to support the RI-IST program should be as realistic as possible, with reduced unnecessary conservatisms, yet include a consideration of uncertainties. These factors are very important when considering the cumulative plant risk and accounting for possible risk increases as well as risk benefits. The licensee should carefully document all of these considerations in the RI-IST program description, including those areas that have been quantified through the use of PRA, as well as qualitative arguments for those areas that cannot readily be quantified in the following: a. The licensee’s proposed RI-IST program should be supported by both a deterministic engineering analysis and a PRA analysis. b. The