Document: NUREG-0800
Document ID: 73dc4705-6dff-4f44-87ee-2a6f76cc6536
Document Type: srp
Title: OTHER SEISMIC CATEGORY I STRUCTURES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1319/ML13198A258.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.8.4
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CFR Title: 

Content:
d Review Plan are covered by the requirements of 10 CFR Part 50 and 10 CFR Part 52, and were approved by the Office of Management and Budget, approval number 3150-0011 and 3150-0151. PUBLIC PROTECTION NOTIFICATION The NRC may not conduct or sponsor, and a person is not required to respond to, a request for information or an information collection requirement unless the requesting document displays a currently valid OMB control number. 3.8.4-38 Revision 4 – September 2013 SRP Section 3.8.4 Description of Changes Section 3.8.4 “OTHER SEISMIC CATEGORY I STRUCTURES” This SRP section affirms the technical accuracy and adequacy of the guidance previously provided in Revision 3, dated May 2010 of this SRP. See ADAMS Accession No.ML100630323. I. AREAS OF REVIEW 1. Enhanced SRP Section 3.8.4 I.3 “Loads and Load Combinations” item A, to include loads induced by the construction sequence and differential settlements. See item 2 in SRP Section 3.8.5, “Description of Changes, II Acceptance Criteria,” for the technical rationale for this change. II. ACCEPTANCE CRITERIA 1. Revised SRP Section 3.8.4 II.4 “Design and Analysis Procedures” item H, to include enhanced guidance to compute dynamic soil pressures on embedded walls. The technical rationale for this change is as follows. The computation of seismically induced lateral soil pressures on embedded walls is acknowledged to be complex and dependent on many factors. Under static at-rest conditions, the soil pressures are primarily controlled by soil type, soil compaction (or relative density), and groundwater conditions. For granular materials, typically placed as backfill in the immediate vicinity of the wall, the static at-rest pressures at a given depth are estimated by Ko x σv, where σv is the vertical intergranular stress due to the weight of the soil above the depth of interest and Ko is called the at-rest coefficient of earth pressure. The parameter Ko is typically estimated to be approximately 0.5.