Document: NUREG-0800
Document ID: b5a87a6e-5e73-493f-b8d9-5de2b5feba56
Document Type: srp
Title: SEISMIC DESIGN PARAMETERS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070317.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.7.1
CFR Part: 
CFR Title: 

Content:
REVIEW RESPONSIBILITIES Primary - Structural Civil Engineering and Geosciences Branch (ESGBECGB ) 1 Secondary - None I. AREAS OF REVIEW The following areas relating to seismic design parameters are reviewed: 1. Design Ground Motion For the seismic design of nuclear power plants, it is customary to specify the earthquake ground motion that is exerted on the structure or on the soil-structure interacting system. The design ground motion, sometimes known as the seismic input 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. The three components of the design ground motions for the operating basis earthquake (OBE) and safe shutdown earthquake (SSE) are reviewed. They 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 characteristics. The control motion should be defined to be on a free ground surface and should be based on data obtained in the free field (see NUREG/CP-0054, Reference . 17) . Two cases are identified 2 depending on the soil characteristics at the site and subject to availability of appropriate recorded ground-motion data. When data are available, for example, for relatively uniform sites of soil or DRAFT Rev. 3 - April 1996 3.7.1-2 rock with smooth variation of properties with depth, the control point (location at which the control motion is applied) should be specified on the soil surface at the top of the finished grade. The free-field ground motion or control motion should be consistent with the properties of the soil profile. For sites composed of one or more thin soil layers overlying a competent material or in case of insufficient recorded ground-motion data, the control