Document: NUREG-0800
Document ID: b172ba61-9651-45f8-ac8e-6d6e00e27060
Document Type: srp
Title: STEEL CONTAINMENT
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1006/ML100630179.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.8.2
CFR Part: 
CFR Title: 

Content:
g., wind, tornado, external flooding) either directly or indirectly impose loads on the steel containment, the design of the steel containment also needs to consider these loads. Load combinations and acceptance criteria that are consistent with those specified in SRP Section 3.8.1 for concrete containments should be used. As noted in 10 CFR 50, Appendix S, the OBE is only associated with plant shutdown and inspection, unless specifically selected by the applicant as a design input. If the OBE is set at one-third or less of the SSE ground motion, explicit analysis is not required. The only exceptions are the postflooding condition and cyclic loading considerations. The 3.8.2-16 Revision 3 - May 2010 staff requirements memorandum for SECY-93-087 provides guidance on the treatment of cyclic loading for the OBE. If the OBE is set at a value greater than one-third of the SSE, explicit analysis must be performed to demonstrate that the applicable load combinations meet the Service Level B stress, strain, deformation, and fatigue limits. 4. Design and Analysis Procedures. Article NE-3000 of ASME Code, Section III, Division 1, Subsection NE, covers design and analysis procedures for steel containments. The procedures given in the ASME Code, with additional guidance provided in the applicable provisions of RG 1.57, constitute an acceptable basis for design and analysis. Moreover, for the specific areas of review described in Subsection I.4 of this SRP section, the following criteria are acceptable: A. Treatment of Nonaxisymmetric and Localized Loads For most containments, the nonaxisymmetric loads that apply are the horizontal seismic and associated sloshing loads, pool swell, and its related hydrodynamic loads caused either by LOCA or by SRV actuation. Other possible nonaxisymmetric and localized loads are those induced by pipe rupture, such as reactions, jet impingement forces, and missiles. For the PWR ice-condenser containment, the design-basis accident may result in a