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:
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 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 a the loss-of-coolant accident (LOCA),46 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. DRAFT Rev. 2 - April 1996 3.8.1-12 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 containment structure or from data obtained on completed containments constructed of the same kind of concrete. In establishing these values, consideration should be given to the differences in the environment between the test samples and the actual concrete in the structure. Cracking of the concrete may be considered in either of the following two ways: (i) the moments, forces, and shears under load may