Document: NUREG-0800
Document ID: 2768345e-44b7-48d8-bfa7-69652aa4faa8
Document Type: srp
Title: CONCRETE CONTAINMENT
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1319/ML13198A245.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.8.1
CFR Part: 
CFR Title: 

Content:
thin the finite element model. Alternatively, additional analyses can treat the effect of concrete cracking by determining the response of the containment to variation in the stiffness characteristics of the containment shell (e.g., shear stiffness and tensile membrane stiffness reduction). As stated in CC-3320 of the ASME Code, the effects of reduction in shear stiffness and tensile membrane stiffness resulting from cracking of the concrete should be considered in methods for predicting the maximum strains and deformations of the containment. Thus, concrete cracking needs to be considered depending on the stress levels caused by the most severe seismic load combination. Technical justification should be provided, if cracking is not considered or is determined to be insignificant. Sections 3.1.3 and C 3.1.3 of ASCE 4-98 provide additional guidance for modeling the stiffness of concrete elements. The staff reviews the methods used for considering creep, shrinkage, and concrete cracking, or the justification for not considering these effects, on a case- by-case basis. E. Dynamic Soil Pressure. Consideration of dynamic lateral soil pressures on embedded walls of a concrete containment (if applicable) is acceptable if the lateral earth pressure loads are evaluated for the three cases identified in SRP Section 3.8.4 II.4.H. If the above methods identified in SRP Section 3.8.4 II.4.H are shown to be overly conservative for the cases considered, then any alternative methods are reviewed on a case-by-case basis. F. 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 recognized in the public domain and has had sufficient history of use to justify its applicability and validity without further demonstration. ii. The computer program’s solutions to a series of test problems have been demonstrated to be substantially identical to those obtained by