Document: NUREG-0800
Document ID: c0d3006a-c4ee-4659-b650-837c0c94b143
Document Type: srp
Title: STABILITY OF SUBSURFACE MATERIALS AND FOUNDATIONS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340604.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.5.4
CFR Part: 
CFR Title: 

Content:
sub- mitted by the applicant is reviewed in detail and compared to an independent study performed by the staff employing both deterministic and probabilistic methods as appropriate. As a minimum, the staff study consists of: 1. A review of appropriate standard penetration test results, other in-situ test data and groundwater conditions to assess liquefaction potential. 2. A careful review of conventional laboratory and cyclic triaxial test data to insure that appropriate samples were obtained and tested from critical, liquefiable zones. 3. Confirmation that an adequate number of samples were properly tested and that the test results account for the natural variation in different samples as well as define the cyclic resistance to liquefaction of the soils. 4. An assessment of the liquefaction potential using a conservative envelope of the test data submitted. 5. A calculation of the stress induced by the earthquake that has been arrived at by an envelope of critical conditions calculated for the site based on variations in the properties of the soil strata. 6. Assurance that conservative ranges of relative density of the soils are estimated. The applicant's estimates of the "safety factor" obtained from his analysis is compared to the safety margins estimated by the staff. (The applicant's plans to "eliminate" the liquefaction condition, usually by excavation and backfill, vibroflotation, gr chemical grouting is evaluated as discussed in Subsections 2.5.4.5 and 2.5.4.12.) 7. An assessment of post-earthquake stability and settlements due to partial liquefaction using state-of-the-art techniques. 2.5.4-12 Rev. 2 - July 1981 8. An assessment of nonseismic liquefaction based on state-of-the-art techniques. Subsection 2.5.4.9. The in-depth staff evaluation of the safe shutdown and operating basis earthquakes is contained in SRP Section 2.5.2. The staff's evaluation of the amplification characteristics of specific soils and rocks beneath the site as determined by