Document: NRC Regulatory Guide
Document ID: 10f3c2aa-ada2-4132-8d49-7867458d81a7
Document Type: regulatory_guide
Title: Design Limits and Loading Combinations for Metal Primary Reactor Containment System Components + HISTORY - HISTORY 10/2006 – DG-1158 , Proposed Revision 1
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0630/ML063000278.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.57
CFR Part: 
CFR Title: 

Content:
considerations. DG-1158, Page 11 3.2 Alternative 2: Update Regulatory Guide 1.57 Under this alternative, the NRC would update Regulatory Guide 1.57 with the updated Code requirements and current staff positions. The benefit of this action would be to include the latest code requirements and current staff position. Therefore, the updated Regulatory Guide 1.57 could improve regulatory effectiveness and reduce unnecessary conservatism, while maintaining or enhancing safety. The costs to the NRC would be the one-time cost of issuing the revised regulatory guide (that is, relatively small), and applicants and licensees would incur little or no cost. Therefore, any adverse consequences of adopting this alternative are considered extremely remote. 4. Conclusion Based on this regulatory analysis, the staff recommends that the NRC revise Regulatory Guide 1.57. The staff concludes that the proposed action will reduce unnecessary conservatism in the design limits and loading combinations for metal containments, leading to a more efficient regulatory process, while maintaining or enhancing safety. BACKFIT ANALYSIS This draft regulatory guide provides licensees and applicants with new guidance that the NRC staff considers acceptable for use in design and analysis of metal primary reactor containments in nuclear power plants. The application of this guide is voluntary. Licensees may continue to use the original version of this regulatory guide if they so choose. No backfit, as defined in 10 CFR 50.109, is either intended or implied. DG-1158, Page 12 REFERENCES American Society of Mechanical Engineers (ASME) Boiler & Pressure Vessel Code, Section III, “Rules for Construction of Nuclear Facility Components, Division 1, Subsection NE, Class MC Components,” 2001 Edition including 2003 Addenda.7 Regulatory Guide 1.29, “Seismic Design Classification,” Revision 3, U.S. Nuclear Regulatory Commission, Washington, DC, September 1978, available in ADAMS under Accession