Document: NRC Regulatory Guide
Document ID: c7a40fcc-fc9d-4eb2-ad86-f9f5b0f04c82
Document Type: regulatory_guide
Title: Plant-Specific, Risk-Informed Decisionmaking:  Technical Specifications (Rev. 2)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1920/ML19206A489.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.177
CFR Part: 
CFR Title: 

Content:
��PRA acceptability,” and related phrasing variants, instead of terms such as “PRA quality,” “PRA technical adequacy,” and “technical adequacy” to describe the appropriateness of the PRA used to support risk-informed licensing submittals, (2) update Section C.2.3, “Evaluation of Risk Impact,” of this RG, (3) delineate that long-term CT extension requests will increase the depth and level of detail of the staff’s review and the need for proposed measures to reduce the risk impact of the TS change commensurate with the proposed CT extension, and (4) add new Section C.2.6 on integrated decisionmaking consistent with RG 1.174, Section C.2.6. Background The Commission established its regulatory requirements for TS in 10 CFR 50.36. In doing this, the Commission emphasized matters related to the prevention of accidents and the mitigation of accident consequences; the Commission noted that applicants were expected to incorporate into their TS “those items that are directly related to maintaining the integrity of the physical barriers designed to contain radioactivity” (Ref. 8). In August 1995, the NRC issued a final Commission policy statement on the use of PRA methods in nuclear regulatory activities, titled “Use of Probabilistic Risk Assessment Methods in Nuclear Activities: Final Policy Statement” (Ref. 9), which encourages greater use of this analysis technique to improve safety decisionmaking and regulatory efficiency. One activity undertaken in response to the policy statement is the use of PRA to support decisions to modify an individual plant’s licensing basis. Such modifications are related to decisions to modify an individual plant’s TS. In support of the use of risk-informed decisionmaking, the NRC developed RG 1.174, which provides guidance on an acceptable approach for developing risk-informed applications for a licensing basis change and considers engineering issues and applies risk insights. This RG supplements the guidance