Document: NUREG-0800
Document ID: dfd1fbdb-0dd1-46f4-8489-99de53d66afc
Document Type: srp
Title: OTHER SEISMIC CATEGORY I STRUCTURES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550054.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.8.4
CFR Part: 
CFR Title: 

Content:
for Nuclear Power Plants (Other Than Reactor Vessels and Containments)” 1.143 “Design Guidance for Radioactive Waste Management Systems, Structures, and Components Installed in LWR Plants” 1.160 “Monitoring the Effectiveness of Maintenance at Nuclear Power Plants” 1.199 “Anchoring Components and Structural Supports in Concrete” 3. Loads and Load Combinations. The specified loads and load combinations are acceptable if found to be in accordance with the guidance given below: A. Concrete Structures All loads and load combinations are to be in accordance with ACI 349 and RG 1.142. Supplemental criteria on the use of loads and load combinations are presented below. Dead loads include hydrostatic loads and, for equipment supports, include static and dynamic head and fluid flow effects. Live loads include any movable equipment loads and other loads which vary with intensity and occurrence, such as soil pressure. The dynamic effects of lateral soil pressure should be accounted for in accordance 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. 3.8.4-10 Revision 2 - March