Document: NUREG-0800
Document ID: 9cdf4eb8-90c4-435e-84a4-d23c09056921
Document Type: srp
Title: STABILITY OF SUBSURFACE MATERIALS AND FOUNDATIONS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070268.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.5.4
CFR Part: 
CFR Title: 

Content:
ples 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 estimatesEstimates of the "safety factor" obtained from histhe applicant's52 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, or 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. 8. An assessment of nonseismic liquefaction based on state-of-the-art techniques. Subsection 2.5.4.9. The indepth 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 procedures discussed 2.5.4-15 DRAFT Rev. 3 - April 1996 in that section and in Subsections 2.5.4.2, 2.5.4.4, and 2.5.4.7 are summarized and cross-referenced herein. The review of Subsection 2.5.4.9 concentrates on determining its consistency or inconsistency with other subsections. Cross-referencing with other sections is expected. Subsection 2.5.4.10. Static analyses of the bearing capacity and settlement of the supporting soils under the loads of fills, embankments, and foundations are evaluated by conventional, state-of-the-art methods (Ref. 18). In general, the evaluation procedure