Document: NUREG-0800
Document ID: 5c405a7a-1098-462c-b352-0353348123fd
Document Type: srp
Title: 3.05
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1235/ML12352A305.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.50
CFR Part: 
CFR Title: 

Content:
- Process When a Certified Design is Not Used 3.7.1-48 Draft Revision 4 - December 2012 SRP Section 3.7.1 “Seismic Design Parameters” Description of Changes This SRP section affirms the technical accuracy and adequacy of the guidance previously provided in Revision 3, dated March 2007 of this SRP. See ADAMS Accession No. ML070640306. I. AREAS OF REVIEW 1. Revised the designation of the primary review responsibility to be the organization responsible for structural reviews. 2. Deleted reference to Regulatory Guide 1.165 because it was withdrawn. 3. Added text to reference additional interim staff guidance provided in ISG-01 and ISG 017. II. ACCEPTANCE CRITERIA 1. Added text to reference additional interim staff guidance in ISG-01 and ISG-017. 2. Enhanced guidance in SRP Section 3.7.1 II.1.B related to design time histories. The technical rationale for this change is as follows. When the seed recorded time history is selected based on a reasonable comparison of the spectral shape of the seed with the target design spectra, then it would facilitate and ensure that a good spectral matching can be achieved. This occurs because the magnitude of the seed record could be increased without the need for making significant adjustments at each frequency. This approach avoids increasing the input at certain frequencies too much which could lead to significant overprediction of the response at certain frequencies and cause underprediction at adjacent frequencies. 3. Enhanced guidance in SRP Section 3.7.1 II.1.B ii. (Option 1 - single set of time histories, Approach 2), item (d). The technical rationale for this change is as follows. The first criterion in Item (d) of the SRP ensures there is no significant overprediction of the response spectrum of the artificial ground motion time history. The second criterion ensures that there will not be a significant energy gap at any frequency over the frequency range of interest. Both criteria should be satisfied to ensure that