Document: NRC Regulatory Guide
Document ID: 0ae1e098-eccd-43e7-b12e-43b05aa1fe48
Document Type: regulatory_guide
Title: Safety-Related Concrete Structures for Nuclear Power Plants (Rev. 3)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1617/ML16172A240.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.142
CFR Part: 
CFR Title: 

Content:
1.0L + Ccr + H + Ta + Ra + 1.4Pa (9-8) (AL) U = D + F + 1.0L + H + Ta + Ra + Pa + Yr + Yj + Ym + Ess (9-9) (AL) Legend NL = Normal Loading condition SEL = Severe Environmental Loading condition EEL = Extreme Environmental Loading condition AL = Abnormal Loading condition 3.2 Construction loads need to be considered in the design of concrete 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. DG-1283, Page 12 3.3 Hydrodynamic loads associated with seismic loads (i.e., the impulsive and sloshing loads for fluids in tanks) are to be considered as part of Ess in load combinations (9-6) and (9-9). Hydrodynamic loads associated with seismic loads are to be considered as part of EO in load combination (9-4). All other hydrodynamic loads should be taken as Yj in load combination (9-9). 3.4 Loads resulting from pool dynamics for the concrete structures in pressure-suppression containments should be analyzed. Licensees and applicants should provide justification for the methods of analysis used. 3.5 Design for loads due to accidental explosions, or accidental vehicle impacts or small aircraft impacts should use load combination (9-7) with those loads in lieu of Wt, and further guidance provided in ACI 349-13, Appendix F, “Special Provisions for Impulsive and Impactive Effects.” RG 1.217 covers effects from beyond-design-basis large aircraft impacts. 3.6 The NRC staff does not endorse Section 9.2.10 of ACI 349-13. Therefore, for load combinations (9-6) and (9-9), the staff does not endorse reducing the load effects of the seismic load (Ess) by 10 percent for the conditions in Section 9.2.10 of ACI 349-13. 3.7 The NRC staff does not endorse use of strength reduction factor φ = 0.75 in section 9.3.2.3 and R9.3.1of ACI 349-13 for shear