Document: NUREG-0800
Document ID: 5887ec11-6ad2-46aa-be7f-d596fb3777b6
Document Type: srp
Title: CONCRETE CONTAINMENT
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070324.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.8.1
CFR Part: 
CFR Title: 

Content:
2 P = Pressure resulting from postaccident inerting assuming carbon dioxide is g3 the inerting agent44 4. Design and Analysis Procedures The procedures of design and analysis utilized for the concrete containment, including the steel liner, are acceptable if found in accordance with those stipulated in 3.8.1-11 DRAFT Rev. 2 - April 1996 Article CC-3300 of the Code. In particular, for the areas of review outlined in subsection I.4 of this SRP section, the following procedures are, in general, acceptable: a. Assumptions on boundary conditions The boundary conditions depend on the methods of analysis to be used and the portions of the containment shell to be separately analyzed. If the analysis is to be accomplished through the use of the finite element technique, and is to include the foundation media, the boundary would be the demarcation lines separating the foundation mass taken into consideration in the analysis from the surrounding media. The boundaries of the foundation mass considered have to be so selected that any further extension of the boundaries will not affect the results by more than 15 percent%.45 If only the containment shell and its foundation mat are taken into consideration in the analysis, then the bottom of the foundation slab is the boundary of the analytical model. The foundation media should be represented by appropriate soil springs. If separate analyses of the containment shell and the base mat are to be used, it is considered acceptable if strain comparability of the bottom portion of the shell with the base mat is maintained. b. Axisymmetric and nonaxisymmetric loads Even with the large penetrations and buttresses that may be utilized in the shell, the overall behavior of the shell has been shown to be axisymmetric under pressure. Therefore, it is acceptable if such an assumption is made with respect to the containment geometry. However, for loads such as those induced by wind, tornadoes, earthquakes, and pipe rupture, the nonaxisymmetric