Document: NRC Regulatory Guide
Document ID: d9f4b714-eb98-48e4-a663-7a7dd874b2db
Document Type: regulatory_guide
Title: A Performance-Based Approach to Define the Site-Specific Earthquake Ground Motion (Rev. 0)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1928/ML19288A181.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.208
CFR Part: 
CFR Title: 

Content:
Regulatory Guide Periodic Review Regulatory Guide Number: 1.208, Revision 0 Title: A Performance-Based Approach to Define the Site-Specific Earthquake Ground Motion Office/Division/Branch: RES/DE/SGSEB Technical Lead: Vladimir Graizer Recommended Staff Action: Revise. 1. What are the known technical or regulatory issues with the current version of the Regulatory Guide (RG)? The RG dates to 2007 and some references have changed since then. For example, the RG refers to the seismic sources identified and characterized by the Lawrence Livermore National Laboratory (LLNL) and the Electric Power Research Institute (EPRI) and states that the characterization of specific seismic sources found in these databases may still represent the latest information available at the time that a PSHA is to be undertaken. NUREG-2115, “Central and Eastern United States Seismic Source Characterization for Nuclear Facilities,” (CEUS-SSC), has replaced the EPRI and LLNL models and needs to be referenced in the RG update. The recently developed Ground Motion Models (GMMs) replaced the previous EPRI 2004 and 2006 GMMs and need to be referenced in the RG update. The RG also references the CEUS and WUS (Western United States) Time History databases provided in NUREG/CR-6728, “Technical Basis for Revision of Regulatory Guidance on Design Ground Motions: Hazard- and Risk- Consistent Ground Motion Spectra Guidelines”, with respect to the selection of earthquake time histories for use in time history-based site response analyses. More recently updated databases, such as the Pacific Earthquake Engineering Center (PEER) Ground Motion Databases for the WUS and CEUS, need to be referenced. For the revision, the references, including the examples mentioned above, should be updated. The RG update should also incorporate staff experience from the reviews of early site permit (ESP) and combined license (COL) applications conducted since 2007 as well as the lessons learned from the seismic hazard