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:
ic capacity of equipment necessary to maintain or restore SFP cooling capabilities to the GMRS for the reevaluated seismic hazard; and b. Evaluate HF sensitive in-plant SSCs relied upon to maintain or restore core cooling, containment and SFP cooling capabilities using the methods in the EPRI Report 3002004396, “High Frequency Program: Application Guidance for Functional Confirmation and Fragility Evaluation,” ADAMS Accession No. ML15223A095, consistent with its endorsement by letter dated September 17, 2015, ADAMS Accession No. ML15218A569, if the GMRS from the reevaluated seismic hazard exceeds the design basis seismic hazard above 10 Hz. 6.2. Treatment of Reevaluated Flooding Hazards Appendix G of NEI 12-06, Rev. 1A discusses a method to assess the results of the flooding hazard reevaluations with respect to the guidance and strategies required by 10 CFR 50.155(b)(1). 6.2.1. (Modified) Mitigating Strategies Sections G.4.1 and G.4.2 of Appendix G of NEI 12-06, Rev. 1A discuss a method to assess or modify the mitigating strategies to show they comply with the requirements of 10 CFR 50.155(b)(1) and 10 CFR 50.155(c)(2)(i) by using the new flooding hazard information, referred to as mitigating strategies flood hazard information. Staff Position: Sections G.4.1 and G.4.2 of Appendix G of NEI 12-06, Rev. 1A provide acceptable methods to show that the existing strategies and guidelines comply with the requirements of 10 CFR 50.155(b)(1) and 10 CFR 50.155(c)(2)(i) for the new flooding hazard information or for developing modified strategies and guidelines. 6.2.2. Alternate Mitigating Strategies Section G.4.3 of Appendix G of NEI 12-06, Rev. 1A discusses a method to develop AMS to meet the requirements of 10 CFR 50.155(b)(1) and 10 CFR 50.155(c)(2)(i). Staff Position: 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