Document: NRC Regulatory Guide
Document ID: 37f53017-d71c-4f3c-a2a4-ab67a8270066
Document Type: regulatory_guide
Title: Pre-Earthquake Planning, Shutdown, and Restart of a Nuclear Power Plant Following an Earthquake (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1826/ML18268A185.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.166
CFR Part: 
CFR Title: 

Content:
s. • 10 CFR 50, Appendix S, “Earthquake Engineering Criteria for Nuclear Power Plants,” for plants licensed on or after January 10, 1997, requires, in part, plant shutdown if the Operating Basis Earthquake Ground Motion is exceeded or if significant plant damage occurs. Prior to resuming operations, the licensee must demonstrate to the Commission that no functional damage has occurred to those features necessary for continued operation without undue risk to health and safety of the public, and that the licensing basis is maintained. • 10 CFR 100, Appendix A, “Seismic and Geologic Siting Criteria for Nuclear Power Plants,” Section V(a)(2), requires plant shutdown if vibratory ground motion exceeding that of the Operating Basis Earthquake occurs. Prior to resuming operations, the licensee must demonstrate to the Commission that no functional damage has occurred to those features necessary for continued operation without undue risk to the health and safety of the public. Related Guidance • RG 1.12, “Nuclear Power Plant Instrumentation for Earthquakes” (Ref. 4), provides guidance for seismic instrumentation that is acceptable to the NRC staff. RG 1.12 endorses, in part, American National Standards Institute/American Nuclear Society (ANSI/ANS)-2.2-2016, “Earthquake Instrumentation Criteria for Nuclear Power Plants” (Ref. 5), as an acceptable method for placement of seismic sensors for various nuclear power plant configurations. • RG 1.208, “A Performance-Based Approach to Define the Site-Specific Earthquake Ground Motion” (Ref. 6), provides guidance on the development of a site-specific ground motion response spectrum (GMRS). • NRC Inspection Manual Chapter (IMC) 0326, “Operability Determinations & Functionality Assessments for Conditions Adverse to Quality or Safety” (Ref. 7), provides guidance to NRC inspectors in their review of licensee’s operability determinations and resolution of degraded or nonconforming conditions. Purpose of