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:
der 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 model. At present, models for detcrministically computing the time history of strong ground 2.5.2-14 I motion from a given source-site configuration may-be ij% limited. It is 2 therefore acceptable to use an ensemble of ground-motion time histories from 3 earthquakes with similar size, site-source characteristics, and spectral 4 characteristics or results of a statistical analysis of such an ensemble. 5 Total duration of the motion is acceptable when it is as conservative as 6 values determined using current studies such as References 48, 49, 50, and 51 7 . 8 9 10 11 _ _ 12 13 14 T` -3:- '':-i:i 15 2.-5-t-7--Oocrat-inu Basis arauc. in mceting the requirements o 16 Reference 1, this subsection is acceptable when the vibratory ground motion 17 for the OBE is described and the response spectrumn (at appropriate damping 18 values) at the site specified. Probability calculations (e.g., Refs. 41, 47, 19 and 52) should bc used to estimaate the probability of exceedin the ODE durin 20 the 21 operating le of the plant. Thc maximum viratory ground motion of the ODE 22 should be at least one half the maximum vibratory ground motion of the SSE 23 unless a lowcr ODE can be justified on the basis of probability calculations. 24 it ha: been staff practice to accept the ODE if the return period is on the 25 order of hundreds of years (e.g., Ref. 31). i 26 III. REVIEW PROCEDURES 27 Upon receiving the applicant's SAR, an acceptance review is conducted to 28 determine compliance with the "Mp~e investigative requirements of 10 CFR 29 Part 100, -Appendix A (Ref. 1). The reviewer also identifies 30 any site-specific problems, the resolution of which could result in extended 31 delays in completing the review. 2.5.2-15 1 After SAR acceptance and docketing, those areas arc identified where F