Document: NRC Regulatory Guide
Document ID: c576d7be-9b19-4dd6-b001-ce0856ea4dc5
Document Type: regulatory_guide
Title: Design Response Spectra for Seismic Design of Nuclear Power Plants + HISTORY - HISTORY 01/2025 – Periodic Review of Revision 2 – Revise 10/2010 – Periodic Review of Revision 1 – No issues identified (Rev. 2)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2504/ML25042A133.pdf
Revision Date: 2025-03
Chapter: 
Section ID: RG-1.60
CFR Part: 
CFR Title: 

Content:
re interaction analyses. 2. What is the impact on internal and external stakeholders of not updating the RG for the known issues, in terms of anticipated numbers of licensing and inspection activities over the next several years? For new reactors, the staff anticipates that there will be less than 10 applications that involve site seismic ground motions investigations in the next five years. 3. What is an estimate of the level of effort needed to address identified issues in terms of full-time equivalent (FTE) and contractor resources? The level of effort is estimated to be about 0.4 FTE. 4. Based on the answers to the questions above, what is the staff action for this guide (Reviewed with no issues identified, Reviewed with issues identified for future consideration, Revise, or Withdraw)? Revise. 5. Provide a conceptual plan and timeframe to address the issues identified during the review. Starting in January 2025, the NRC plans to conduct a comprehensive 6-month literature review along with performing technical analyses to support revision of RG 1.60. An evaluation of the current RG 1.60 horizontal and vertical spectral shapes will be performed to determine their adequacy for designs in the WUS along with the development of an appropriate spectral shapes for the CEUS. The NRC has set a proposed date of Quarter 2 FY 2026 for the revision of RG 1.60 to be completed. REFERENCES 1. EPRI. 2013. EPRI 2004-2006 Ground-Motion Model (GMM) Review Project 3002000717, Final Report. June 2013, Electric Power Research Institute, Palo Alto, CA. 2. PEER 2018/08: "Central and Eastern North America Ground-Motion Characterization - NGA-East Final Report.", Report No. 2018/08, Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA. NOTE: This review was conducted in January 2025 and reflects the staff’s plans as of that date. These plans are tentative and subject to change.