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:
onfirm it has adequate seismic margin to protect the equipment at the reevaluated seismic hazard. f. Licensees should evaluate portable equipment and the means to move that equipment that is stored as described in NEI 12-06, Rev. 1A, Section 5.3.1.1.b to confirm that securing and protection from seismic interactions at the new seismic hazard level remains DG-1301, Page 15 acceptable. The structure housing the equipment should be evaluated to confirm that, while deformation of the structure is possible, it will protect the equipment at the reevaluated seismic hazard so as to allow deployment of the equipment. g. Licensees should evaluate portable equipment and the means to move that equipment that is stored as described in NEI 12-06, Rev. 1A, Section 5.3.1.1.c to confirm that securing and protection from seismic interactions at the reevaluated seismic hazard level remains acceptable. h. Licensees should review routes for the deployment of equipment from a storage location to its usage location to ensure no adverse impact is created by a seismic event at the reevaluated hazard level, such as potential soil liquefaction. i. Licensees should evaluate locations for connection points described in NEI 12-06, Rev. 1A, Section 5.3.2.2 to confirm they only require access through structures that are seismically robust for the reevaluated seismic hazard. j. Licensees should evaluate large internal flooding sources considered under NEI 12-06, Rev 1A, Section 5.3.3.2 for robustness as defined in NEI 12-06, Rev 1A, Appendix A using the reevaluated seismic hazard rather than the design basis seismic hazard. k. Licensees may consider equipment from off-site in diverse, redundant locations to be protected from the reevaluated seismic hazard. 6.1.1. Case 1: Demonstration of Reasonable Protection for Exceedances Limited to High Frequency Staff Position: If the ground motion response spectrum (GMRS) for a licensee’s reevaluated seismic hazard is fully bounded by the licensee’s