Document: NUREG-0800
Document ID: 29f5ac9f-4962-4021-913a-6375076e03fd
Document Type: srp
Title: SEISMIC SYSTEM ANALYSIS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340566.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.7.2
CFR Part: 
CFR Title: 

Content:
review of applications to construct and operate nuclear power plants. These documents are made available to the public as part of the Commission's policy to Inform the nuclear Industry and the general public of regulatory procedures and policies. Standard rbview plans are not substitutes for regulatory guides or the CommissIon's regulations and compliance with them is not required. The standard review plan sections are keyed to the Standard Format and Content of Safety Analysis Reports for Nuclear Power Plants. Not all sections of the Standard Format have a corresponding review plan. Published standard review plans will be revised periodically, as appropriate, to accommodate comments and to reflect new Informa- tion and experience. Comments and suggestions for Improvement will be considered and should be sent to the U.S. Nuclear Regulatory Commission. Office of Nuclear Reactor Regulation. Washington. D.C. I 2. Natural Frequencies and Responses For the operating license review, significant natural frequencies and responses for major Category I structures are reviewed. In addition, the response spectra at major Category I equipment elevations and points of support are reviewed. 3. Procedures Used for Analytical Modeling The criteria and procedures used in modeling for the seismic system analyses are reviewed. The criteria and bases for determining whether a component or structure is analyzed as part of a system analysis or independently as a subsystem are also reviewed. 4. Soil-Structure Interaction The design earthquake motion is defined in the "free field," i.e., without the presence of structures, at the ground surface, at a real or hypothetical rock outcrop, or at a rock interface appropriate to the particular site. Because of the deformability of the supporting rock or soil, the resulting motions of the base slab will differ from the corresponding free-field motions. This difference between the base slab motion and the free-field motion is known as the