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:
res associated with the change in the licensing basis should be avoided. Compensatory measures included in the submittal for a TS change should be measures for which the licensee is not already taking credit. Any such compensatory measures would become part of the licensing basis if the TS change were approved. The following are examples of compensatory measures: a. adding a test of a redundant train before initiating a scheduled maintenance activity as part of a CT extension application, b. limiting simultaneous testing (e.g., surveillance tests) and maintenance of redundant or diverse systems as part of a CT extension application, especially if the testing causes unavailability of the redundant train or component, c. incorporating a staggered test strategy as part of the SF reduction application, d. improving test and maintenance procedures to reduce test- and maintenance-related errors, e. improving operating procedures and operator training to reduce the impact of human errors, and f. improving system designs, which reduces overall system unavailability and plant risk. When compensatory measures are part of the TS change evaluation, the risk impact of these measures should be considered and presented, either quantitatively or qualitatively. When a quantitative evaluation is used, the total impact of these measures should be evaluated by comparison to the “small” guideline (Principle 4 in RG 1,174). This includes (1) evaluation of the proposed TS changes without the compensatory measures, (2) evaluation of the proposed TS changes with the compensatory measures, and (3) specific discussion of how each of the compensatory measures is credited in the PRA model or during the evaluation process. 2.3.7 Risk-Informed Plant Configuration Control Program (Tier 3) Consistent 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