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:
tent with the key principle that changes to TS result in small increases in the risk to public health and safety (Principle 4 in RG 1.174), certain configuration controls should be used. To support TS changes, a risk-informed plant configuration control program would uncover risk-significant plant equipment outage configurations in a timely manner during normal plant operation. This can be DG-1287, Page 19 accomplished by evaluating the impact on plant risk of, for example, equipment unavailability, operational activities like surveillance testing or load dispatching, or weather conditions. The importance of this third-tier stems from the difficulty of identifying all possible risk-significant configurations under Tier 2 that will ever be encountered over extended periods of plant operation. 2.3.7.1 Configuration Risk Management Program Licensees should describe their capability to perform a contemporaneous assessment of the overall impact on the safety of proposed plant configurations before and during maintenance activities that remove equipment from service. Licensees should explain how these tools or other processes will be used to ensure that risk-significant plant configurations will not be entered and that appropriate actions will be taken when unforeseen events put the plant in a risk-significant configuration. 2.3.7.2 Components of the Configuration Risk Management Program The licensee should ensure the CRMP contains the following components. Component 1: Implementation of Configuration Risk Management Program The intent of the CRMP is to implement 10 CFR 50.65(a)(4) (part of the Maintenance Rule) for online maintenance for risk-informed TS, with the following additions and clarifications: a. The scope of structures, systems, and components (SSCs) to be included in the CRMP is all SSCs modeled in the licensee’s plant PRA, in addition to all SSCs considered high safety significant in accordance with RG 1.160, “Monitoring the Effectiveness of Maintenance