Document: NRC Regulatory Guide
Document ID: 96ecfd93-e64a-4f35-93fe-d3b95daac61d
Document Type: regulatory_guide
Title: Monitoring the Effectiveness of Maintenance at Nuclear Power Plants + HISTORY –HISTORY 06/2018 – DG-1336 , Proposed Revision 4 09/2011 – DG-1278 , Proposed Revision 3 08/1996 – DG-1051 , Proposed Revision 2 06/1994 – DG-1031, Proposed Revision 1 11/1992 – DG-1020, Proposed Revision 0 (Rev. 4)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1812/ML18129A080.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.160
CFR Part: 
CFR Title: 

Content:
PRA is used in a licensee’s implementation of the Maintenance Rule, the acceptability of the base PRA should be sufficient to provide the needed confidence in the results being used in the decision. RG 1.200, “An Approach for Determining the Technical Adequacy of Probabilistic Risk Assessment Results for Risk-Informed Activities,” (Ref. 18) describes an approach the NRC staff finds acceptable to develop and maintain PRA acceptability in support of risk-informed decision-making. Maintenance Risk Assessments The intent of 10 CFR 50.65(a)(4) is to require licensees to conduct assessments before performing maintenance activities on SSCs covered by the Maintenance Rule and to manage the increase in risk that may result from the proposed activities. The results of these assessments are to be used in DG-1336, Page 18 conjunction with other regulatory requirements and, therefore, cannot be used as justification for performing activities that may not comply with other regulations. Performing the assessment discussed in Section 11.0 “Assessment of Risk Resulting From Performance of Maintenance Activities” of NUMARC 93-01 does not relieve the licensee from compliance with its license (including technical specifications) and applicable regulations. The intent of this section of NUMARC 93-01 is to eliminate overlapping requirements for assessments that could be considered to exist under 10 CFR 50.65(a)(4) and 10 CFR 50.59, “Changes, Tests and Experiments.” This clarification applies to temporary alterations directly related to and required in support of the specific maintenance activity being assessed. Note that when a maintenance activity to restore a degraded condition is planned, a compensatory measure already in place addressing that condition would have to be considered in the assessment under 10 CFR 50.65(a)(4) if the measure is to remain in place during the maintenance activity. Temporary Equipment Paragraph 6 of Section 11.3.2, “General Guidance for the