Document: NUREG-0800
Document ID: 1f4dbda0-7bea-416c-9d89-910450ba3299
Document Type: srp
Title: provide further guidance on the use of OBE.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1235/ML12353A377.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.7.2
CFR Part: 
CFR Title: 

Content:
ions are reviewed and judged on a case-by-case basis. 4. Design and Analysis Procedures The design and analysis procedures used for the containment internal structures are acceptable if found to be in accordance with the following: A. PWR Dry Containment Internal Structures i. Primary Shield Wall and Reactor Cavity The design and analysis procedures used for the shield wall are acceptable if found to be in accordance with ACI 349 with additional guidance provided by RG 1.142. This code is based on the strength design method. The design and analysis of anchors (steel embedments) used for component and structural supports on concrete structures are 3.8.3-22 Draft Revision 4 - December 2012 acceptable if found to be in accordance with ACI 349, Appendix B, with additional guidance provided by RG 1.199. Analyses for LOCA loads applicable to the primary shield wall, such as the cavity differential pressure combined with pipe rupture reaction forces, are acceptable if these loads are treated as dynamic time-dependent loads. This requires that either a detailed time-history analysis be performed or a static analysis using the peak of the forcing function amplified by an appropriate chosen dynamic factor be employed. Elastic behavior of the wall should be maintained under the differential pressure. However, for the concentrated accident loads, such as Yr, Yj, or Ym, elasto-plastic behavior may be assumed if the deflections are limited to maintain functional requirements. Simplified methods for determining effective dynamic load factors for elastic behavior are acceptable if found to be in accordance with recognized dynamic analysis methods. ii. Secondary Shield Walls Design and analysis procedures used for the secondary shield walls are acceptable if found to be in accordance with conventional beam/slab design and analysis procedures described in ACI 349, with additional guidance provided RG 1.142. The design and analysis of anchors (steel embedments) used for component and