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:
ntive maintenance program are not necessary and subsequent failures would not be MPFFs. Scope of the Hazards to be Considered During Power Operations NUMARC 93-01 provides guidance to licensees on the scope of hazard groups to be considered for the 10 CFR 50.65(a)(4) assessment provision during power operating conditions. Section 11.3.3 “Scope of Assessment for Power Operating Conditions” of NUMARC 93-01 states that the scope of hazard groups to be considered for assessment includes internal events, internal floods, and internal fires. Paragraph 7 of section 11.3.4.2 “Qualitative Considerations” of NUMARC 93-01 states that weather, external flooding, and other external impacts need to be considered if such conditions are imminent or have a high probability of occurring during the planned out-of-service duration. The NRC staff considers these two sections of NUMARC 93-01 to encompass the scope of hazards that licensees should consider during power operation in order to perform an adequate assessment of the potential impact of risk that may result from proposed maintenance activities. Scope of Initiators to be Considered for Shutdown Conditions NUMARC 93-01 provides guidance to licensees on the scope of hazard groups to be considered for the 10 CFR 50.65(a)(4) assessment provision during shutdown conditions. Section 11.3.6 “Assessment of Methods for Shutdown Conditions” of NUMARC 93-01 states to licensees that they should consider section 4.0 of “NUMARC 91-06 “Guidelines for Industry Actions to Assess Shutdown Management” when developing an assessment process that meets 10 CFR 50.65(a)(4). Paragraph 5 of section 11.3.6 states that weather, external flooding, and other external impacts need to be considered if such conditions are imminent or have a high probability of occurring during the planned out-of-service duration. The NRC staff considers NUMARC 91-06 acceptable for use with the following clarification. The acceptable application of NUMARC 91-06