Document: NUREG-0800
Document ID: 1121c8ce-ab70-416c-9784-421014a1b25b
Document Type: srp
Title: SEISMIC DESIGN PARAMETERS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1419/ML14198A460.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.7.1
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CFR Title: 

Content:
REVIEW RESPONSIBILITIES Primary - Organization responsible for seismic and structural analysis reviews Secondary - Organization responsible for review of seismic ground motion development 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 earthquake design ground motions that are exerted on the plant structures and used in soil-structure interaction (SSI) analyses. The design 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 design ground motions are considered: 1) operating basis earthquake (OBE) and 2) safe shutdown earthquake (SSE). The three spatial components of the 3.7.1-2 Revision 4 – December 2014 design ground motions (two horizontal and one vertical) are reviewed. The design ground motions for the OBE and SSE should be consistent with the description of the free-field ground motions at the site provided in NUREG-0800, Standard Review Plan (SRP) Section 2.5.2, “Vibratory Ground Motion,” which includes the variation in and distribution of ground motions in the free field, sources and directions of the 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, “Design Response Spectra for Seismic Design of Nuclear Power Plants,” or RG 1.208, “A Performance-Based Approach to Define the Site-Specific Earthquake Ground Motion,” and are reviewed under SRP Section 2.5.2. These RGs provide procedures that are acceptable to the staff for defining the design response spectra in the free-field for use in developing the OBE and SSE design ground motion needed for the design of nuclear power