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:
se under part 52 after the Commission makes the finding under § 52.103(g), to follow and to maintain the effectiveness of an emergency plan that meets the requirements in appendix E to 10 CFR part 50 and, for nuclear power reactor licensees, the planning standards of § 50.47(b). Consideration of Risk from Internal Fires in Maintenance Rule (a)(4) Activities The initial versions of NUMARC 93-01 provided no guidance on how licensees should consider the risk from internal fires in the conduct of Maintenance Rule (a)(4) activities unless these fires were imminent or were considered to have a high probability of occurring during the planned out-of-service duration. During public interactions, the staff and industry agreed that additional guidance was necessary to adequately assess and manage the risk from internal fires in the conduct of activities required by 10 CFR 50.65(a)(4). Consequently, industry included guidance in NUMARC 93-01which states methods licensees can use to identify equipment which is important to mitigation of risk of core damage from fire DG-1336, Page 19 initiators, describes approaches to developing and implementing appropriate risk management actions, and discusses the tools for effective implementation of the guidance. 3. Inclusion of Electrical Distribution Equipment The monitoring efforts under the Maintenance Rule, as defined in 10 CFR 50.65(b), encompass those SSCs that directly and significantly affect plant operations, regardless of which organization actually performs the maintenance activities. Maintenance activities that occur in the switchyard can directly affect plant operations; as a result, electrical distribution equipment out to the first intertie with the offsite distribution system (i.e., equipment in the switchyard) should be considered for inclusion as defined in 10 CFR 50.65(b). 4. Nonsafety related SSCs Section 8.2.1.2 “Nonsafety-Related SSCs that Mitigate Accidents or Transients” is endorsed with the following