Document: NUREG-0800
Document ID: c447d6bd-a500-4e1a-acf0-d819cc4f0e41
Document Type: srp
Title: FOUNDATIONS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550055.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.8.5
CFR Part: 
CFR Title: 

Content:
ses design procedures used for Seismic Category I foundations other than containment, emphasizing the extent of compliance with American Concrete Institute (ACI) 349, with additional guidance provided by Regulatory Guide (RG) 1.142, for concrete structures and the American National Standards Institute/American Institute of Steel Construction (ANSI/AISC N690-1994) including Supplement 2 (2004) specifications for steel structures. For containment foundations, the emphasis is on the extent of compliance with the procedures discussed in Subsection I.4 of SRP Section 3.8.1. The review includes analysis procedures used for Seismic Category I foundations with respect to the applicability of the theories on which these procedures are based. Among the areas reviewed are the following: A. Assumptions about boundary conditions and the expected behavior of each foundation when subjected to the various design loads. B. Methods that transmit lateral loads and forces and overturning moments thereof from the structure to the foundation media. Such forces are mainly generated by environmental and abnormal plant conditions such as wind, tornadoes, earthquakes, and pipe ruptures. The review includes methods of determining overturning moments attributable to earthquakes, as described in SRP Section 3.7.2. C. Computer programs that are used in the design and analysis of Seismic Category I foundations. D. Category I structures design report (see Appendix C to SRP Section 3.8.4). E. A structural audit (see Appendix B to SRP Section 3.8.4). 3.8.5-4 Revision 2 - March 2007 Some recent applications submitted for DC use a single foundation mat for the nuclear island structures. For such designs, attention is given to bending, shear, and similar factors in the base mat that are attributable to uneven settlement, construction sequence, and mat flexibility. The review also considers the design of the junction of the sidewall and base mat, as well as stiff or soft spots in the underlying soil.