Document: NUREG-0800
Document ID: e40387bd-a6d6-49ae-a11b-6d22124df03a
Document Type: srp
Title: Each calculated spectrum of the artificial time history is considered to envelop the
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070317.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.0
CFR Part: 
CFR Title: 

Content:
such 44 45 methods are used, they will be reviewed and accepted on a case-by-case basis. The damping values for foundation soils must be based upon measured values or other pertinent laboratory data, considering variation in soil properties and strains within the soil, and must include an evaluation of dissipation from pore pressure effects as well as material damping for saturated site conditions. 3. Supporting Media for Category I Structures To be acceptable, the description of supporting media for each Category I structure must include foundation embedment depth, depth of soil over bedrock, soil layering characteristics, design groundwater elevation, dimensions of the structural foundation, total structural height, and soil properties such as shear wave velocity, shear modulus, Poisson's ratios, and density as a function of depth. Technical Rationale:46 The technical rationale for application of the above acceptance criteria to this Seismic Design Parameter section is discussed in the following paragraphs.47 1. General Design Criterion 2 requires, in relevant part, that SSCs important to safety be designed to withstand the effects of natural phenomena such as earthquakes without loss of capability to perform their intended safety functions. GDC 2 further requires that the design bases reflect appropriate consideration for the most severe natural phenomena that have been historically reported for the site and surrounding area, with sufficient margin for the limited accuracy, quantity, and period of time in which the historical data have been accumulated in the past. This SRP section reviews seismic design parameters to assure that they are appropriate and contain sufficient margin such that seismic analyses 3.7.1-9 DRAFT Rev. 3 - April 1996 (reviewed under other SRP sections) accurately and/or conservatively represent the behavior of SSCs during postulated seismic events. Applicable guidance for implementation of and achieving compliance with the requirements set