Document: NUREG-0800
Document ID: 6d95bc89-e14a-4d87-bf91-1d1760c2aff8
Document Type: srp
Title: FOUNDATIONS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1235/ML12353A388.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.8.5
CFR Part: 
CFR Title: 

Content:
w many time histories should be considered and how should the results from each of the time histories be evaluated, (3) the adequacy of the mathematical model, (4) 3.8.5-25 Draft Revision 4 - December 2012 enhancement of the criteria for selection of the appropriate friction values, and (5) acceptance criteria if minimal sliding displacements do occur. 2. Revised SRP Section 3.8.5 II.4 “Design and Analysis Procedures” items E, J, and K, to include enhanced guidance to incorporate differential settlement and construction sequence aspects in the foundation design. The technical rationale for this change is as follows. Seismic Category I structures (foundations and superstructures) should be designed to take into account the additional member forces and moments that are induced by the combined effects of the construction sequence and the short term differential settlement of the soil under the foundation, as well as the long-term settlement expected to occur during the life of the structure. Past experience and current industry codes and standards indicate that these are important design considerations. SRP Sections 3.8.1, 3.8.3, 3.8.4, and 3.8.5 were enhanced to provide additional guidance regarding: (1) how to consider the effects of the construction sequence and the differential settlements (including the long-term settlements expected to occur during the life of the structure) in the standard design process which postulates the geotechnical parameters that are generic (i.e., not the result of a site-specific geotechnical investigation), and does not fully specify the construction sequence; (2) the need to establish a clear interface between DC and COL applications that permits verification of the foundation design by the COL applicant, including implementation of a settlement monitoring program; and (3) specific identification of the loads due to differential settlements and construction sequence as an area of staff review under the “loads and load