Document: NUREG-0800
Document ID: 8160c1fd-7cef-4c93-8e12-456019f2cfd2
Document Type: srp
Title: FOUNDATIONS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1319/ML13198A267.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.8.5
CFR Part: 
CFR Title: 

Content:
ation, erection, inspection, testing, and surveillance, if any, of seismic Category I foundations are covered by codes, standards, and guides that apply either in their entirety or in part. Subsection II.2 of SRP Section 3.8.4 includes a list of such documents. In addition, the documents listed in Subsection II.2 of SRP Section 3.8.1 are acceptable for the containment foundation. 3. Loads and Load Combinations. The specified loads and load combinations used in the design of seismic Category I foundations are acceptable if found to be in accordance with those combinations described in Subsection II.3 of SRP Section 3.8.1 for the containment foundation and with those combinations listed in Subsection II.3 of SRP Section 3.8.4 for all other seismic Category I foundations. Also to be included are loads that are induced by the construction sequence and by the differential settlements of the soil under and to the sides of the structures. In addition to the load combinations referenced above, the combinations used to check against sliding and overturning attributable to earthquakes, winds, tornadoes, hurricanes, and against flotation because of floods are acceptable if found to be in accordance with the following: A. D + H + E B. D + H + W C. D + H + E' D. D + H + Wt E. D + F' Where D, E, W, E', and Wt are as referenced in Subsection II.3 of SRP Section 3.8.4, where H is the lateral earth pressure, and F' is the buoyant force of the design-basis flood. In load combination D, the higher of Wt or hurricane should be used. 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 analysis or design is not required.