Document: NUREG-0800
Document ID: e7548e72-8c59-4c82-98dd-ff425e1de29a
Document Type: srp
Title: SEISMIC DESIGN PARAMETERS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1235/ML12352A305.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.7.1
CFR Part: 
CFR Title: 

Content:
REVIEW RESPONSIBILITIES Primary - Organization responsible seismic and structural analysis reviews Secondary - None I. AREAS OF REVIEW The specific areas of review are as follows: 1. Design Ground Motion. For the seismic design of nuclear power plants, it is customary to specify the design earthquake ground motion that is exerted on the plant structures or on the soil-structure interacting systems. The design earthquake ground motion, also known as the seismic input motion or control motion, is based on the seismicity and geologic conditions at the site and expressed in such a manner that it can be applied to the dynamic analysis of structures, systems, and components (SSCs). Two levels of 3.7.1-2 Draft Revision 4 - December 2012 design earthquake ground motions are considered: 1) operating basis earthquake (OBE) and 2) safe shutdown earthquake (SSE). The ground motion response spectra (GMRS) in the free-field for use in developing the OBE and SSE design ground motion are needed for the design of nuclear power plant SSCs. The three spatial components of the design ground motions (two horizontal and one vertical) are reviewed. The design ground motion for the OBE and SSE should be consistent with the description of the free-field ground motion at the site provided in Standard Review Plan (SRP) Section 2.5.2, which includes the variation in and distribution of ground motion in the free field, sources and directions of motion, propagation and transmission of seismic waves, and other site response characteristics. The seismic free-field ground motions can be developed based on Regulatory Guides (RGs) 1.60 or 1.208, and they are reviewed under SRP Section 2.5.2. These RGs provide procedures that are acceptable to the staff for defining the GMRS in the free-field for use in developing the OBE and SSE design ground motion needed for the design of nuclear power plant SSCs. The GMRS are site-specific ground spectra determined on the ground surface or as free-field outcrop