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:
nitude M specified in Table B-1 occurred within a distance less than or equal to that specified in Table B-1. Table B-1 Maximum Distance from an Earthquake with Moment Magnitude M at which the OBE Can Be Exceeded Magnitude (M) Distance (km) 5.0–5.5 80 5.6–6.0 150 6.1–6.5 250 6.6–7.0 300 7.1–7.5 380 7.6–8.0 480 If plant shutdown is warranted under the above guidelines, the plant should be shut down in an orderly manner (see Sections 6.2 and 6.5 of ANSI/ANS-2.23-2016). DG-1337, Appendix A, Page A-2 The licensee should conduct a post-earthquake plant walkdown after the earthquake (see Section 6.2 of ANSI/ANS-2.23-2016). (2) The earthquake resulted in Instrumental Intensity VI (Table B-2) or greater within 5 kilometers (km) of the plant. Table B-2 ShakeMap Instrumental Intensity Scale (Ref. 2 and Ref. 3) Note that the determination of epicentral location, magnitude, and intensity by the U.S. Geological Survey, National Earthquake Information Center, will usually take precedence over other estimates. However, higher quality damage reports or a lack of damage reports from the nuclear power plant site or its immediate vicinity will take precedence over more distant reports. REFERENCES 1. ANSI/ANS-2.23-2016, “Nuclear Power Plant Response to an Earthquake,” LaGrange Park, IL.7 2. Wald, D.J., V. Quitoriano, T.H. Heaton, H. Kanamori, C.W. Scrivner, and C.B. Worden, “TriNet ‘ShakeMaps’: Rapid Generation of Peak Ground Motion and Intensity Maps for Earthquakes in Southern California,” Earthquake Spectra, 15(3):537–556, 1991.8 3. U.S. Geological Survey, ShakeMap 3.5 Manual, available at https://usgs.github.io/shakemap/index.html. 7 Copies of ANSI/ANS standards may be purchased from the ANS Web site (http://www.new.ans.org/store/), or by writing to American Nuclear Society, 555 North Kensington Avenue, La Grange Park, IL 60526 (telephone: 800-323-3044). 8 Earthquake Engineering Research Institute, 499 14th Street, Suite 220, Oakland, CA 94612-1934 USA