Document: NUREG-0800
Document ID: 850ac8e3-95f2-46fe-acf3-570cfcf2c887
Document Type: srp
Title: Liquefaction Potential.  In meeting the requirements of 10 CFR Parts 50 and
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0707/ML070730598.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.5.4.8
CFR Part: 
CFR Title: 

Content:
t soil mechanics principles. Liquefaction potential is reviewed by a study of the results of geotechnical investigations including boring logs, laboratory classification test data and soil profiles to determine if any of the site soils could be susceptible to liquefaction. The results of in-situ tests such as the standard penetration tests and the density and strength data obtained from undisturbed samples obtained in exploration borings are examined and, when appropriate, related to the liquefaction potential of in situ soils. If it is determined that there may be liquefaction-susceptible soils beneath the site, the applicant's site exploration methods, laboratory test program, and analyses are reviewed for adequacy and reasonableness. The analysis submitted 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: 2.5.4-12 Revision 3 - March 2007 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 ensure 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 granular soils or relative consistency of fine-grained soils are estimated.