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:
lateral earth pressure, and F' is the buoyant force of the design-basis flood. Justification should be provided for including live loads or portions thereof in these combinations. As noted in Appendix S to 10 CFR Part 50, the operating-basis earthquake (OBE), designated as E above, is only associated with plant shutdown and inspection unless the applicant specifically selects it as a design input. If the OBE is set at one-third or less of the safe-shutdown earthquake (SSE) ground motion, an explicit response or design analysis is not required. If the OBE is set at a value greater than one-third of the SSE, an analysis and design must be performed to demonstrate that the Seismic Category I foundations remain functional and fall within applicable stress, strain, and deformation limits. SRP Section 3.7 provides additional guidance on OBE use. 4. Design and Analysis Procedures. The design and analysis procedures used for Seismic Category I foundations are acceptable if found to be in accordance with the following: A. The design should consider the soil-structure interaction, hydrodynamic effect, and dynamic soil pressure. B. For Seismic Category I concrete foundations other than the containment foundations, the procedures are in accordance with the ACI 349, with additional guidance provided by RG 1.142. C. For Category I steel foundations, the procedures are in accordance with ANSI/AISC N690-1994 including Supplement 2 (2004). D. For the containment foundation, if in accordance with the design and analysis procedures referenced in SRP Section 3.8.1, Subsection II.4. E. The design report is acceptable if it satisfies the guidelines provided in SRP Section 3.8.4, Appendix C. F. The structural audit is conducted in accordance with SRP Section 3.8.4, Appendix B. Methods for determining the overturning moment attributable to an earthquake should be in accordance with the methods described in SRP Section 3.7.2. Computer programs are acceptable if the validation provided is