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:
havior 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, considera- tion 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 be obtained on the basis of an uncracked section for all loading combinations. In sizing the reinforcing steel required, however, the concrete shall not be relied upon for resisting tension. Thermal moments may be modified to take creep and cracking into consideration. (ii) For axisymmetrical loadings, cracking of the concrete may be considered through the use of computer programs which are capable of treating such cracking by an iterative process. However, for nonaxisymmetric loadings, most of the computer programs available do not have the capability of considering cracking, since the structure itself 3. 8. 3"9 Rev. 1 - July 1981 becomes nonaxisymmetric when concrete cracking is to be considered iteratively. Accordingly, if the concrete is cracked under any load combination involving axisymmetric and nonaxisymmetric loadings, a method should be described for considering cracking. Such methods are reviewed on a case-by-case basis. e. Computer programs The computer programs used in the design and analysis should be described and validated by any of the following procedures or criteria: (i) The computer program is a recognized program in the public domain and has had sufficient history of use to justify its applicability and validity without further demonstration. (ii) The computer program solution to a series of test problems has been demonstrated to be