Document: NUREG-0800
Document ID: 45f5d841-54ef-4876-be3e-86eafc6ca90a
Document Type: srp
Title: Each calculated spectrum of the artificial time history is considered to envelop
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1235/ML12352A305.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.0
CFR Part: 
CFR Title: 

Content:
P section indicates that an explicit analysis for the OBE, in addition to the SSE, should be performed unless the magnitude of the OBE is set at one-third or less of the SSE. Criteria for the required characteristics of the earthquake motion are presented which include the duration of the seismic ground motion. SRP Section 3.7.1 also specifies that the horizontal free-field SSE ground motion at the foundation level shall be represented by an appropriate response spectrum, such as that defined in RG 1.60, with a minimum peak ground acceleration of 0.1g.The criteria presented in this SRP section provide the earthquake loadings and seismic design parameters so that the SSI analysis can determine the response of the SSCs in terms of stresses, strains, and deformations. In addition, the use of these criteria allows the SSI analysis to calculate the floor response spectra for use in qualification of equipment. Meeting these requirements provides assurance that appropriate methods will be used to determine the required OBE and SSE loadings and the response of SSCs, which will ensure that they will remain functional within applicable acceptance limits. III. REVIEW PROCEDURES The reviewer will select material from the procedures described below, as may be appropriate for a particular case. These review procedures are based on the identified SRP acceptance criteria. For deviations from these acceptance criteria, the staff should review the applicant’s evaluation of how the proposed alternatives provide an acceptable method of complying with the relevant NRC requirements identified in Subsection II. 1. Design Ground Motion A. Design Response Spectra. For the non-standard plant design (i.e., COL application that does not reference a DC), the design response spectra for the OBE and SSE, for all applicable damping values, are checked to ensure that the response spectra are in accordance with the acceptance criteria as given in subsection II.1.A.i. For the DC, the CSDRS for the