Document: NRC Regulatory Guide
Document ID: 921f4c90-482e-4f9e-a835-28839c357dcb
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:
Development of an AMS that provides a capability to mitigate the BDBEE by mitigating or preventing an ELAP that would occur as a result of the BDBEE through exhaustion of fuel for operating emergency power sources is an acceptable method of compliance with 10 CFR 50.155(b)(1) when the hazard level for the AMS is identified. Section G.4.3 of Appendix G of NEI 12-06, Rev. 1A provides an acceptable method to develop AMS to meet the requirements of 10 CFR 50.155(b)(1) and 10 CFR 50.155(c)(2)(i). 6.2.3. Targeted Hazard Mitigating Strategies Section G.4.4 of Appendix G of NEI 12-06, Rev. 1A discusses a method to develop targeted hazard mitigating strategies (THMS) to meet the requirements of 10 CFR 50.155(b)(1) and 10 CFR 50.155(c)(2)(i). Staff Position: Development of a THMS that provides a capability to mitigate the BDBEE by mitigating or preventing an ELAP that would occur as a result of the BDBEE through exhaustion DG-1301, Page 21 of fuel for operating emergency power sources is an acceptable method of compliance with 10 CFR 50.155(b)(1) when the hazard level for the THMS is identified. Section G.4.4 of Appendix G of NEI 12-06, Rev. 1A provides an acceptable method to develop THMS to meet the requirements of 10 CFR 50.155(b)(1) and 10 CFR 50.155(c)(2)(i). 7. Coordination with Severe Accident Management Guidelines In SRM-COMSECY-15-0065, (Ref. 43) the Commission directed the NRC staff to “…ensure that any NRC-endorsed guidance for the proposed rule will provide for appropriate coordination of the FLEX support guidelines, extreme damage mitigating guidelines, and voluntarily maintained SAMGs with the existing emergency operating procedures (EOPs) at each plant….” Section 3.2.1.10 of NEI 12-06, Rev. 1A provides criteria for the selection of parameters to be monitored as part of the minimum set of parameters necessary to support strategy implementation. These criteria include the ability to demonstrate the success of the strategies at maintaining the key safety