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:
less than 1x10-6 and an ICLERP of less than 1x10-7 are considered small for a single TS condition entry3 (Tier 1). b. The licensee has demonstrated that there are appropriate restrictions on dominant risk-significant configurations associated with the change (Tier 2). c. The licensee has implemented a risk-informed plant configuration control program. The licensee has implemented procedures to use, maintain, and control such a program (Tier 3). For one-time-only changes to TS CTs, the frequency of entry into the CT may be known, and the configuration of the plant SSCs may be established. Further, there is no permanent change to the plant CDF or LERF, and hence the risk guidelines of RG 1.174 cannot be applied directly. The staff provides 3 The ICCDP and ICLERP acceptance guidelines of 1x10-6 and 1x10-7, respectively, are established for consistency with the ICDP and ILERP limits of Section 11 in Nuclear Management and Resources Council (NUMARC) 93-01, “Industry Guidelines for Monitoring the Effectiveness of Maintenance at Nuclear Power Plants,” (Ref. 26) applicable for maintenance activities involving normal work controls. RG 1.160, “Monitoring the Effectiveness of Maintenance at Nuclear Power Plants,” endorses, with certain provisions and clarifications, NUMARC 93-01, “Industry Guideline for Monitoring the Effectiveness of Maintenance at Nuclear Power Plants.” DG-1287, Page 22 the following TS acceptance guidelines specific to one-time-only CT changes for evaluating the risk associated with the revised CT: a. The licensee has demonstrated that the impact on plant risk from implementation of the one-time-only TS CT change is acceptable (Tier 1): (1) ICCDP of less than 1x10-6 and an ICLERP of less than 1x10-7, or (2) ICCDP of less than 1x10-5 and an ICLERP of less than 1x10-6 with effective compensatory measures implemented to reduce the sources of increased risk.4 b. The licensee has demonstrated that there are appropriate restrictions on dominant