Document: NRC Regulatory Guide
Document ID: 1ac32162-97f5-4f31-bb0b-e39d7e0e70ca
Document Type: regulatory_guide
Title: Assessing and Managing Risk Before Maintenance Activities at Nuclear Power Plants
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0037/ML003740117.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.182
CFR Part: 
CFR Title: 

Content:
SSCs covered by the Maintenance Rule and manage the increase in risk that may result from the proposed activities. The results of these assessments are to be used in conjunction with other regulatory requirements and, therefore, cannot be used as justification to perform activities which may not comply with other regulations. Performing the assessment of Section 11 does not relieve the licensee from compliance with its license (including technical specifications) and applicable regulations. The intent of certain phrases in this guide 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. 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.) C. REGULATORY POSITION Section 11, "Assessment of Risk Resulting from Performance of Maintenance Activities," dated February 11, 2000, of NUMARC 93-01, "Industry Guideline for Monitoring the Effectiveness of Maintenance at Nuclear Power Plants," provides methods that are acceptable to the NRC staff for complying with the provisions of 10 CFR 50.65(a)(4). Section 11 references other documents, but NRC's endorsement of Section 11 should not be considered as endorsement of the referenced documents. Note that, in paragraph 1. of Section 11.3.7.2, the value "10"3/year" is suggested by the authors as a ceiling for configuration-specific core damage frequency. The subject of such a ceiling value is currently being studied by the NRC. At some later date, a similar or different value may be promulgated by the agency. At this time, the NRC neither endorses nor disapproves of the