Document: NUREG-0800
Document ID: 21a62ef6-c280-44b1-8107-aa1888bd76a7
Document Type: srp
Title: Probabilistic Seismic Hazard Analysis and Controlling Earthquakes.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0529/ML052910327.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.5.2.4
CFR Part: 
CFR Title: 

Content:
Regulatory Guide 1.165 and is consistent with the review findings of Sections 2.5.2.2 and 2.5.2.3. In addition to the above reviews for CEUS sites where applicants did not use the LLNL or EPRI methods and data bases, the staff will further review the applicant's PSHA or other method used to derive controlling earthquakes. The staff will particularly review the approaches used to address uncertainties. The staff will perform an independent evaluation of the earthquake potential associated with each seismic source that could affect the site. The staff will evaluate the applicant's controlling earthquakes using historical seismicity (including maximum historical earthquakes) and paleoseismicity. 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 address uncertainties. The staff will assess the 2.5.2-6 Rev. 3 - March 1997 controlling earthquakes for the site derived from the applicant's method to be sure that they are consistent with the controlling earthquakes and ground motions used in licensing (a) other licensed facilities at the site, (b) nearby plants, or (c) plants licensed in similar seismogenic regions, or to be sure the reasons they are not consistent are understood. 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. In addition, an alternative reference probability may also have to be developed, particularly for sites in the active plate margin region and for sites at which a known tectonic structure dominates the hazard. The staff will perform an independent evaluation of the earthquake potential associated with each seismic source