Document: NUREG-0800
Document ID: 8e07b880-6f70-4aba-8fed-a47a4d8a6666
Document Type: srp
Title: -
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1235/ML12353A354.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.7.2
CFR Part: 
CFR Title: 

Content:
Draft Revision 4 - December 2012 due to the foundation uplift should be assessed, and if found important, then it should be accounted for in the seismic design, which is then reviewed on a case-by-case basis. Additional guidance for foundation design is incorporated in a proposed revision to SRP Section 3.8.5. 3. Enhanced SRP Section 3.7.2 II.4 “Soil-Structure Interaction” by adding acceptance criteria related to finite element discretization of excavated soil volume. See item 6 below for the technical rationale for this change, which is associated with the additional acceptance criteria for SSI analysis of embedded structures using the substructure approach (direct vs. subtraction methods). 4. Enhanced SRP Section 3.7.2 II.4 “Soil-Structure Interaction” by adding acceptance criteria related to soil properties in DC and COL application. See item 5 below for the technical rationale for this change. 5. Enhanced SRP Section 3.7.2 II.4 “Soil-Structure Interaction” by adding acceptance criteria related to the distribution of site profiles and their relationship to the amplified CSDRS. The technical rationale for this change is as follows. In accordance with 10 CFR 52.47 (a) (1) and (2), the DC applicant defines the postulated site parameters which include the site profiles to be used in the seismic analysis of the SSCs. The applicant defines the site profiles that are specifically applicable to the DC application. Based on the assumed site profiles, a free-field input ground motion, referred to as the CSDRS is established, which should be appropriate to the postulated site profiles. Together the postulated soil profiles and CSDRS define the seismic design basis for the plant. The CSDRS should be appropriate to the postulated site profiles in frequency content because the site profile frequency characteristics determine the amplification of the input ground motion through the site. Using a seismic SSI analysis, the seismic ground motion input spectra is