Document: NRC Regulatory Guide
Document ID: bbd6ed7f-058c-4bd2-8849-f708d0179bbf
Document Type: regulatory_guide
Title: Flexible Mitigation Strategies for Beyond-Design-Basis Events + HISTORY - HISTORY 11/2015 – DG-1301 , Proposed Revision 0
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1316/ML13168A031.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.226
CFR Part: 
CFR Title: 

Content:
ble method for controlling unavailability of the equipment in order to satisfy that element of reasonable protection. 4. Equipment Maintenance 10 CFR 50.155(c)(3) requires that the equipment relied on for the mitigation strategies under § 50.155(b)(1) receive adequate maintenance such that it is capable of fulfilling its intended function. Section 11.5 of NEI 12-06, Rev. 1A discusses the maintenance and testing of the equipment. Section 3.2.1.13 discusses the Electric Power Research Institute (EPRI) program developed for maintenance of the equipment, which is documented in the EPRI technical report 3002000623, “Applications Center: Preventive Maintenance Basis for FLEX Equipment – Project Overview Report” (Ref. 25). The EPRI technical report 3002000623 was endorsed by NRC letter dated October 7, 2013 (Ref. 26). Staff Position: Sections 11.5 and 3.2.1.13 of NEI 12-06, Rev. 1A, provide an acceptable method for maintaining the equipment relied on for the mitigation strategies under § 50.155(b)(1). 5. Configuration Control 10 CFR 50.155(b) and (b)(1) require that applicants or licensees maintain an integrated response capability that includes strategies and guidelines to mitigate beyond-design-basis external events from natural phenomena that result in an ELAP concurrent with either an LUHS or, for nuclear power plants with passive reactor designs, a loss of normal access to the normal heat sink. 10 CFR 50.155(f) allows licensees to make changes to the implementation of the requirements of 10 CFR 50.155 without NRC approval provided that the licensee performs an evaluation demonstrating that 10 CFR 50.155 continues to be met prior to making the change. Section 11.8 of NEI 12-06, Rev 1A discusses the configuration control of the strategies and guidelines as well as the maintenance of an overall program document and record of changes. Staff Position: Section 11.8 of NEI 12-06, Rev. 1A provides an acceptable method for maintaining configuration control of an