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:
ordance with AISC 360-16, Appendix 1, Section 1.3, is acceptable for use with AISC 360-16, Chapter C, for an inelastic stability analysis of safety-related steel building structures if stresses exceed the elastic limit before instability. 8. ANSI/AISC N690-18, Appendix N3—Design for Fatigue The upper limit on the allowable stress range used in the design for fatigue should be the lower of (1) the value based on Appendix 3, Section 3.1, of AISC 360-16 or (2) the allowable stress range obtained using Equation (A-3-1) in Appendix 3 to ANSI/AISC 360-16. 9. ANSI/AISC N690-18, Appendix N4—Structural Design for Fire Conditions This RG does not endorse ANSI/AISC N690-18, Appendix N4, on structural design for fire conditions. 10. ANSI/AISC N690-18, Appendix N5—Evaluation of Existing Structures ANSI/AISC N690-18, Appendix N5, on the evaluation of existing structures, does not address seismic and dynamic loads and, therefore, is not applicable to commercial nuclear power plants. This RG does not endorse Appendix N5. Evaluation of existing structures is not within the scope of this RG. 11. ANSI/AISC N690-18, Appendix N9—Steel-Plate Composite Walls 11.1. ANSI/AISC N690-8, Appendix N9, Section N9.1.6—Design for Impactive and Impulsive loads Section N9.1.6 and its subsections are based on ACI 349-13, Appendix F, on special provision for impulsive and impactive effects, adapted to SC walls. The NRC staff considers the provisions in Section N9.1.6 and its subsections acceptable with the additions and exceptions proposed below: 11.1.1. Impactive and impulsive loads are assumed to be concurrent with other loads (e.g., dead and live loads) in determining the required strength of structural elements. 11.1.2. For impulsive loads, the strength available is at least 20 percent greater than the magnitude of any portion of the impulsive loading, which is approximately constant for a time equal to or greater than the first fundamental period of the structural member. DG-1304. Page