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:
10 CFR 50.55a(z)(1). The Commission’s policy statement on PRA encourages greater use of this analysis technique to improve safety decisionmaking and regulatory efficiency. In response to the policy statement, the staff and industry have used PRA in support of decisions to modify an individual plant’s IST program. NRC staff normally evaluate licensee-initiated IST program changes that are consistent with currently approved staff positions (e.g., RGs, standard review plans, branch technical positions) using deterministic engineering analyses. In such cases, the licensee would not be expected to submit risk information in support of the proposed change. For IST program change requests that go beyond current staff positions, in which a licensee elects to use risk information in support of the proposed IST change, the staff’s evaluation may use deterministic engineering analyses and the risk-informed approach set forth in this RG. The staff will review the information provided by the licensee to determine whether it can approve the application based on both deterministic and risk-informed considerations, as applicable, and will either approve or reject the application based upon the review. This RG provides application specific details of a method acceptable to the NRC staff for developing RI-IST programs and supplements the information given in RG 1.174. This guide identifies acceptable approaches for utilizing PRA information, along with established deterministic engineering information in the development of RI-IST programs that can lead to more efficient use of plant resources while still maintaining acceptable levels of quality and safety. RG 1.174 provides overall guidance on the technical aspects that are common to developing acceptable risk-informed programs for all applications RG 1.175, Page 5 such as IST (this guide), inservice inspection, and technical specifications. However, licensees may propose other approaches for consideration by the NRC staff.