Document: NUREG-0800
Document ID: acd9ebb4-ee58-4db4-b1b3-47182cad2c4f
Document Type: srp
Title: Safe Shutdown Earthquake
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0423/ML042390209.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.5.2.6
CFR Part: 
CFR Title: 

Content:
alli Intensity (MMI) VIII, the 35 available empirical relationships between intensity and peak ground 2.5.2-13 1 2 3 4 5 6 7 8 9 10 motion may not be suitable for determining the appropriate reference acceleration for seismic design. 4. Reispense Spectra developed by theoretical-empirical modeling of ground motion may be used to supplement site-specific spectra if the input parameters and the appropriateness of the model are thoroughly documented (e.g., Refs. 19, 44, 15, and 46 . G). Modeling is particularly useful for sites near capable faults i L.othat may experience ground motion that is different in terms of frequency content and wave type from ground motion caused by more distant earthquakes. 11 12 13 14 15 16 17 .~'18 19 20 21 5. Prebabilstic estimates of seismic hazard should be calzulated (e.g., Rcfs. 41 and 47) and the underlying assumptions and associated uncertaintics should be documented to assist in the staff's overall dctcrriniic approach. The probabilistic studics houl'd highlight which scismic sources are signifclant to the site. Uniferm hazard spectra (spectra that have a uniform probability of cxecedanec over the frequency range of interest) shewing uncertainty should be ealculated for 0.01, 0.001, and 0.0001 annual probabiitics of emeeedanee at the site. The probability of exceeding the SSE response spectra should also be estimated and comparison of results made with other probabilistic studies.- 22 23 24 25 26 27 28 29 30 31 32 33 _ 4 _ ound H Y _ ..... Id. ' __im . -....... t _u 4 _PE _ IM NdMP b" Th _4 Rn The time duration and number of cycles of strong ground motion are required for analysis of site foundation liquefaction potential and feef design of many plant components. The adequacy of the time history for structural analysis is reviewed under SRP Section 3.7.1. The time history is reviewed in this SRP section to confirm that it is compatible with the seismological and geological conditions in the site vicinity and with the accepted SSE