Document: NUREG-0800
Document ID: 208323eb-98a2-4771-855b-656723f8e782
Document Type: srp
Title: -
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1235/ML12353A365.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.8.1
CFR Part: 
CFR Title: 

Content:
Draft Revision 4 - December 2012 will essentially follow those in the concrete. The strains in the concrete under the various load combinations as obtainable from the analysis of the shell are thus imposed on the liner plate, and the resulting strains and stresses in the liner and its anchors should be lower than the allowable limits defined in Tables CC-3720-1 and CC-3730-1 of the ASME Code. K. Ultimate Capacity of Concrete Containment. Regulatory criteria require a determination of the internal pressure capacity for containment structures, as a measure of the safety margin above the design-basis accident pressure. i. Reinforced Concrete Containments One acceptable methodology for cylindrical reinforced concrete containments is to estimate the capacity based on attaining a maximum global membrane strain away from discontinuities (i.e., the hoop membrane strain in a cylinder) of 1 percent. The specific location of interest is the steel reinforcement in the hoop direction, closest to the inside surface of the concrete. The inside radius of the concrete wall should be used in calculating the strain in the hoop reinforcing steel. To conduct the necessary analysis, both nonlinear material behavior and nonlinear geometric behavior must be considered for the reinforcing steel. The stress-strain curve for the reinforcing steel should be based on the code-specified minimum yield strength and a stress-strain relationship above yield that is representative of the specific grade of reinforcing steel. The stress-strain curve must be developed for the design-basis accident temperature. The use of an alternate failure criteria for the analyses of noncylindrical containments and cylindrical containments are reviewed on a case by case basis. Guidance on computer modeling of reinforced concrete containments for internal pressure capacity calculations appears in NUREG/CR-6906. NOTE: In applying the analysis methodology to existing containment structures, it is permissible to use