Document: NRC Regulatory Guide
Document ID: a03860d0-46a2-4c53-b0e5-9398a146bf12
Document Type: regulatory_guide
Title: Safety-Related Steel Structures and Steel-Plate Composite
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2033/ML20339A558.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.243
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Content:
2 published in 2004 (Ref. 14), in Section 3.8.3, Revision 4, “Concrete and Steel Internal Structures of Steel or Concrete Containments,” and Section 3.8.4, Revision 4, “Other Seismic Category I Structures.” Since the publication of N690-1994 and its 2004 Supplement 2, ANSI/AISC-N690 has been revised several times, leading to the current 2018 version. ANSI/AISC N690-2018 differs significantly from ANSI/AISC N690-1994 and its Supplement 2. ANSI/AISC N690-18 addresses updated design approaches, characterization of loads and load combinations, materials, and construction technologies, including SC structures. SC structures involve a modular construction approach that new reactor designs have adopted as one of the major features for some of their structures. The NRC has historically reviewed new reactor applications and license amendments that incorporate the use of SC construction on a case-by-case basis. In 2015, AISC, through a multiyear effort, issued the first U.S. consensus standard for the design, fabrication, and erection of safety-related SC walls as Appendix N9 to Supplement 1 to the 2012 edition of AISC N690, “Specification for Safety-Related Steel Structures for Nuclear Facilities,” namely, AISC N690s1 15 (Ref. 15). ANSI/AISC N690-2018 includes Appendix N9. The NRC Office of Nuclear Regulatory Research contracted with Brookhaven National Laboratory (BNL) to assist the staff with the review of the technical basis for ANSI/AISC N690. As a deliverable, BNL released report BNL-220652-2020-INRE, “Evaluation of the Specification for Safety- Related Steel Structures for Nuclear Facilities, ANSI/AISC N690-18, for Application to Nuclear Power Plants,” issued December 2020 (Ref. 16). This report describes the assessment of ANSI/AISC N690-18 for use in nuclear power plants. The report outlines the technical basis for the acceptance of this new specification and the technical background for additional staff guidance. This guide considers the