Document: NUREG-0800
Document ID: d4d0e6e4-7a83-4668-8394-54672bdc0bc4
Document Type: srp
Title: and 3.2.2.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340575.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.2.1
CFR Part: 
CFR Title: 

Content:
8.1-8 .Rev. 1 - July 1981 If separate analyses of the containment shell and the base mat are to be used, it is considered acceptable if strain compatibility 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, tornados, earthquakes, and pipe rupture, the nonaxisymmetric effect of these loads should be considered. c. Transient and localized loads During normal operation, a linear temperature gradient across the containment wall thickness may develop. After the loss-of-coolant accident (LOCA), however, .the sudden increase in temperature in the steel liner and the adjacent concrete may produce a nonlinear transient temperature gradient across the containment wall thickness. Effects of such transient loads should be considered. In a PWR ice-condenser containment, nonaxisymmetric and transient pressure loads resulting from compartmentation inside the containment will develop after a LOCA. In a BWR pressure suppression containment nonaxisymmetric and transient pressure loads resulting from earthquakes, LOCA and/or SRV actuation including fluid-structure interaction should be considered. For the effects of such localized and transient loads, the overall behavior of the containment structure should first be determined. A portion of the containment shell, within which the localized or transient load is located, should then be analyzed, using the results obtained from the analysis of the overall vessel behavior as boundary conditions. d. Creep, shrinkage, and cracking of concrete Creep and shrinkage values for concrete should be established by tests performed on the concrete which is to be used in the