Document: NUREG-0800
Document ID: c6cc946d-0eb9-4625-8de1-3db909a1cace
Document Type: srp
Title: Seismic Wave Transmission Characteristics of the Site.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0423/ML042390209.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.5.2.5
CFR Part: 
CFR Title: 

Content:
31 32 2.5.2-9 1 ___ _______ stud I e i2 3 4 5 In mceting thc requiremcnts of Refcrcnce 1, this subsection is aceepted when 6 L the seismic wave transmission characteristics (amplification 7 or deamplification) of the materials overlying bedrock at the site are 8 described as a function of the significant frequencies . The 9 following material properties should be determined for each stratum under the 10 site: seismic compressional and shear wave velocities, bulk 11 densities, soil index properties and classification, shear modulus and damping 12 variations with strain level, and water table elevation and its variation 13 . In each case, methods used to determine the properties should be 14 described in Subsection 2.5.4 of the SAR and cross-referenced in this 15 subsection. For thc maximum carthquakc determined in Subsection 2.5.2.4, thc 16 free field ground motion (including ignificant frequencies must be 17 detcrmined, and an analysis should bc performcd to detcrminc thc site cffcets 18 on differcnt seizmie w:av typez in the sign i&fant frequcncy bands. if 19 appropriat, th analysis should conidcr the cffeets of ztc site endito and 20 matcrial property variations upon wavc propagation and frequency content. 21 The frce field ground motion (also referred to az control motion) should be 22 defined to bc on a ground surfacc and should bc bazcd on data obtained in thc 23 frec ficld. Two cases arc identified, depcnding on thc soil charactcristic. 24 at the stc and subJeet to availability of appropriate recorded ground motion 25 data. When data.arc availablc, for cxamplc, for rclatively uniform MiteS of 26 soil or rock with smooth variation of propertics with depth, thc control point 27 (location at wh-ch the control motion ^s applied), should be specified on the 28 soil zurfaee at the top of the finished grade. The free ficld ground moetion 29 . or control motion should bc consistent with thc propertics of thc soil 30 .prefil. For itcz eompeed of on or mo : ti l.layer