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:
��Are the nonsafety-related SSCs used in plant Emergency Operating Procedures (EOPs)?” In Revision 4F, two new paragraphs were added to address FSGs. FSGs were developed to provide an extra level of defense-in-depth in addition to the EOP mitigating function and do not change the existing requirements of that function. These two additions are discussed below. The first addition sets forth that FSGs are not considered to be EOPs: FLEX Support Guidelines (FSGs) are not considered to be EOPs. Equipment described only in FSGs would not be in scope of the Maintenance Rule unless otherwise required by paragraph 50.65(b). The added language above addresses the FLEX equipment. The language is very similar to the wording in Section 8.2.1.3 of NUMARC 93-01, Rev. 4A (stating that SAMGs “are not considered to be EOPs” and stating that “[E]quipment used in support of 10 CFR 50.54(hh)(2) (Loss of Large Areas) would not be in scope of the Maintenance Rule unless otherwise required by paragraph 50.65(b).” (unchanged in Rev. 4F). The second addition takes a position that equipment described in FSGs are not “used” in EOPs for purposes of scoping into the Maintenance Rule under 50.65(b)(2)(i) (stating that the scope of the monitoring program includes nonsafety related SSCs that “are used in plant emergency operating procedures (EOPs)”) as long as the other criteria are assessed. Section 8.2.1.3 of Rev. 4F of NUMARC 93-01 defines “explicitly used” and “implied use” in order to clarify the scoping criteria. Explicitly used means those SSCs specifically called out in the EOP by DG-1336, Page 9 tag identification or noun name that provide a mitigating function, and includes those SSCs required to support the explicitly used SSCs even though they are not called out in the EOP. For example, all SSCs associated with an instrument loop supporting a control room instrument that is specifically called out in the EOP are considered explicitly used. Implied use means