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:
rations and Compensatory Measures (Tier 2) Consistent with the key principle that changes to TS should result in only small increases in the risk to public health and safety (Principle 4 in RG 1.174), and as part of proposed TS change evaluations, certain compensatory measures (discussed below) that balance the calculated risk increase caused by the DG-1287, Page 18 changes may be considered. This consideration should be made in light of the acceptance guidelines given in RG 1.174. Note that these considerations may be part of Tier 2 or Tier 3 programs. The licensee should demonstrate that there are appropriate restrictions on dominant risk-significant configurations associated with the TS change. An effective way to perform such an assessment is to evaluate equipment according to its contribution to plant risk (or safety) while the equipment covered by the proposed CT change is out of service. Evaluation of such combinations of equipment out of service against the Tier 1 ICCDP and ICLERP acceptance guidelines could be one appropriate method of identifying risk-significant configurations. Once plant equipment is so evaluated, an assessment can be made about whether certain enhancements to the TS or procedures are needed to avoid risk-significant plant configurations. When the licensee wishes to reduce the risk increase resulting from a proposed change even though the licensee judges the individual change to meet the acceptance guidelines in Regulatory Position C.2.4, the licensee might consider taking compensatory measures such as those suggested below. If compensatory measures are considered part of the analysis of the change, the overall application for the TS change should include them. However, overreliance on programmatic activities such as compensatory measures 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