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:
D + F + L + H + To + Ro + Es + C EEL (NB2-15) U = D + F + L + H + To + Ro + Wt EEL (NB2-16) U = D + F + L + H + Ta + Ra + Pa + C AL (NB2-17) U = D + F + L + H + Ta + Ra + Pa + Yr + Yj + Ym + 0.7Es AL (NB2-18) NL = Normal Loading SEL = Severe Environmental Loading EEL = Extreme Environmental Loading AL = Abnormal Loading 2.2.1. Load combination NB2-10 has the same loads as NB2-1 and is, essentially, a combination of dead loads. Load combination NB2-11 has the same loads as NB2-2 and is, essentially, a live load combination with L and H as the dominant loads. Load DG-1304. Page 9 combination NB2-12 has the same loads as NB2-3 and is a live load combination with Lr, or S or R as the dominant loads. 2.2.2. Unless otherwise justified, the allowable strength increase in NB2.6d(8) is limited to 1.5 for load combinations NB2-15 through NR2-18. This reduces the likelihood that the member or fastener strength obtained with the ASD method is not less than the strength that would be obtained with the LRFD method. 2.2.3. Construction loads should be considered in the design of steel structures. These loads consist of dead loads, live loads, temperature, wind, snow, rain, ice, and applicable construction loads, such as material loads, personnel and equipment loads, horizontal construction loads, erection and fitting forces, equipment reactions, and loads from pressure. 2.2.4. Hydrodynamic loads associated with seismic loads (i.e., the impulsive and sloshing loads for fluids in tanks) are to be considered as part of Es in load combinations (NB2-15) and (NB2-18). Hydrodynamic loads associated with seismic loads are to be considered as part of Eo in load combination (NB2-14). All other hydrodynamic loads should be taken as Yj in load combination (NB2-18). 2.2.5. Loads resulting from pool dynamics for SC structures in pressure-suppression containments should be analyzed. Licensees and applicants should justify the methods of analysis used. 2.2.6. The design for loads due to