Document: NUREG-0800
Document ID: 65016276-60eb-4e87-829e-1ac16de720b3
Document Type: srp
Title: Probabilistic Seismic Hazard Analysis and Controlling Earthquakes.  For CEUS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1230/ML12301A010.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.5.2.4
CFR Part: 
CFR Title: 

Content:
l to 5.5. The staff will review the controlling earthquakes and associated ground motions at the site derived from the applicant's PSHA to be sure that they adequately represent the local and regional seismic hazard as represented by both historical seismicity and paleoseismicity. The applicant's probabilistic analysis, including the derivation of controlling earthquakes, is considered acceptable if it follows the procedures in Regulatory Position 3 and Appendix D of RG 1.208. For applicants that use RG 1.208, three pairs of low and high frequency controlling earthquakes should be determined for the mean 10-4, 10-5, and 10-6 annual probabilities of exceedance. For applicants that do not use PSHA, the staff will review the method used to derive the controlling earthquakes and, in particular, the methods used to address uncertainties on a case-by- case basis. For sites not in the CEUS, the staff will review the PSHA or other methods in detail. As in the reviews of CEUS sites, the staff will particularly review the approaches used to evaluate uncertainties. The staff will assess the controlling earthquakes for the site derived from the applicant's method to be sure that they adequately represent the local and regional seismic hazard as represented by both historical seismicity and paleoseismicity. The determination of the controlling earthquakes and the seismic hazard information base for sites not in the CEUS is carried out using procedures similar to those used for CEUS. However, because of differences in seismicity rates and ground motion attenuation characteristics at these sites, alternative magnitude-distance parameters may have to be used. The staff will perform an independent evaluation of the earthquake potential associated with each seismic source that could affect the site. 2.5.2-11 Draft Revision 5 – 2013 For guidance in evaluating the earthquake potential and characterizing the uncertainty for sites that are assessed using methods other than the CEUS-SSC