Document: NRC Regulatory Guide
Document ID: 776b9130-d4de-4c44-81a6-ecd8c36df0ca
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
CFR Part: 
CFR Title: 

Content:
ctice and consistent with applicable NRC requirements. 1 Such information related to this guide may be found at www.IAEA.org or by writing the International Atomic Energy Agency, P.O. Box 100 Wagramer Strasse 5, A-1400 Vienna, Austria; telephone (+431) 2600-0; fax (+431) 2600-7; or e-mail Official.Mail@IAEA.Org. It should be noted that some of the international recommendations do not correspond to the requirements specified in the NRC’s regulations and the NRC’s requirements take precedence over the international guidance. DG-1304. Page 7 C. STAFF REGULATORY GUIDANCE This guide endorses the procedures and standards of ANSI/AISC N690-18 for the design, fabrication, and erection of safety-related steel structures and SC walls for other than reactor vessels and containments, subject to the exceptions and clarifications in the regulatory guidance positions below. 1. ANSI/AISC N690-18, Chapter NA—General Provisions 1.1. Linear piping supports and supports for pressure-retaining components within the jurisdictional boundary of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code, Section III, Subsection NF (Ref. 22) are not within the scope of this RG. 1.2. Rolled Heavy Shapes and Built-Up Heavy Shapes Provisions NA3.1c and NA3.1d in ANSI/AISC N690-18 require that the design documents identify welded connections that the engineer of record determines to be susceptible to lamellar tearing. Those two provisions also require development of a plan to mitigate the conditions creating the potential for lamellar tearing. Unless otherwise justified, this plan should include the ultrasonic examination or testing requirements in NA31.c and NA3.1d of N690 s1-15 (Ref. 15). 2. ANSI/AISC N690-18, Chapter NB—Design Requirements 2.1. ANSI/AISC N690-18, Section NB2.5—Load and Resistance Factor Design Unless otherwise justified, the NRC staff endorses the LRFD load combinations in Section NB2 as modified in Table 1 (modifications indicated in bold font).