Document: NUREG-0800
Document ID: 2d2b9404-d124-483c-971a-a8f564048299
Document Type: srp
Title: SEISMIC DESIGN PARAMETERS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0706/ML070640306.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.7.1
CFR Part: 
CFR Title: 

Content:
REVIEW RESPONSIBILITIES Primary - Organization responsible for reviews of seismic/geotechnical issues 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 design earthquake ground motions are considered: 1) operating basis earthquake (OBE) and 2) safe shutdown earthquake (SSE). 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 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 3.7.1-2 Revision 3 - March 2007 characteristics. The seismic free-field ground motions can be developed based on Regulatory Guides 1.60, 1.165, or 1.208, and they are reviewed under SRP Section 2.5.2. These regulatory guides provide procedures that are acceptable to the staff for defining the ground motion response spectra (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 satisfy the requirements of 10 CFR 100.23 with respect to the development of the SSE. The site-specific GMRS, reviewed under SRP Section 2.5.2, are determined in the free- field on the ground surface. For sites with soil layers near the surface