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:
. In meeting the requirements of Rcfcrenec 1, this subsection is aceepted when the vibratory ground motion specified for the SSE is described in terms of the free field response spectrum and is at least a: conservative as that which would result at the sitc from the maximum earthquake determined in Subsection 2.5.2.1, considcring the site transmission effects determined in Subsection 2.5.2.5. If evealdifferent maximum potential earthquakes produce the largest ground motion: in different frequency band: (as noted 4n Subsection 2.5.2.1), the vibratory ground motion specified for the S ust be a: conser ie In each frequency £band as that for each earthquaker. 24 25 26 11allow  ' i A -Ag _M 27 28 29 30 31 32 33 ---------------- ----------s ~ d y ~ t h ;hJiC MM. e_ _m . .i i _ ge s i a t e s > T iX a d t 7 M i S _ M S t _ s ' t l n 7 S Z t y M s n _ h ~ o t o l n m b r _ r _ a i s e i m i_ a . .s ra pr & I -t >t e =%% ef 2.5.2-11 I K_)j2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 The staff reviews the free ficid response spectra of engineering significance (at apprepriate damping values). Ground motion may vary for different founda t4on conditienA at the site. Whoen the site effetsz arc _ignificant, thiz review is made in conjunction with the review of the design response spectra in Scetion 3.7.1 to ensure consistency with the free field motion. The staff normally evaluates- respnsc speetra en a ease by ease basiz. The staff considcrs comrpliance with the fllowing onditiosn aeeeptable in the eyaluation of the SSE. In all these procedures, thc proposed free fiend respense speetra shall be eonsidered acceptabic if they equal or emeeed the estimated 84th perecntilc ground motion spectra from the maximum or eontrollVng earthquake dczcribcd in Subsection 2.5.2.4. E -- _ - .. - - - 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 C~ 43 4hc following steps suummarize the staft review of the SLE. 1. Both horizontal and vertical component site-specific response spectra should be