Document: NUREG-0800
Document ID: 73747cf4-ff95-449b-b6b0-53dc0755b9e0
Document Type: srp
Title: OTHER SEISMIC CATEGORY I STRUCTURES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1235/ML12353A382.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.8.4
CFR Part: 
CFR Title: 

Content:
with the provisions of Subsection II.4(H) of this SRP section. For equipment supports, live loads also include loads resulting from vibration and any support movement effects. Alternate load cases, in which the magnitudes and locations of the live loads are arranged so that the design includes worst-case conditions, should be investigated, as appropriate. As noted in Appendix S to 10 CFR Part 50, the OBE is associated only with plant shutdown and inspection unless specifically selected by the applicant as a design input. If the OBE is set at one-third or less of the 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 structures remain functional and are within applicable stress, strain, and deformation limits. SRP Section 3.7 provides further guidance on the use of OBE. For structures or structural components subjected to hydrodynamic loads resulting from LOCA and/or SRV actuation, the consideration of such loads should be as indicated in the appendix to SRP Section 3.8.1. Fluid structure interaction associated with these hydrodynamic loads and those from earthquakes should be taken into account. The design of concrete structures needs to consider the loads and load combinations that may occur during their construction. These loads consist of dead loads, live loads, temperature, wind, snow, rain, ice, and construction loads that may be applicable such as material loads, personnel and equipment loads, horizontal construction loads, erection and fitting forces, equipment reactions, and form pressure. Structural Engineering Institute (SEI)/American Society of Civil Engineers (ASCE) Standard 37 gives additional guidance on construction loads. This standard provides supplemental guidance, and in cases where the criteria in the standard and in the Code/SRP conflict, then the Code/SRP shall govern. The