2015 CSCE Annual Conference Regina - Building on our Growth Opportunities

2015 CSCE Annual Conference Regina - Building on our Growth Opportunities Conference

Non-linear finite element analysis to predict ultimate pressure capacity of a nuclear power plant containment structure

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Ms. Ima Tavakkoli Avval, Ryerson University (Presenter)
Dr. M. Reza Kianoush, Ryerson University
Dr. Homayoun Abrishami, Ryerson University

The design requirements for nuclear containment structures when subjected to internal pressure has changed in recent years to improve the margin of safety against failure during a severe accident. The primary objective of this article is to calculate the ultimate pressure capacity (UPC) of a containment structure (CS). The major components of a CS consist of a cylindrical prestressed wall, and a dome. The structure is supported by a rigid reinforced concrete base slab. In this study, the UPC is predicted using the finite element method. For the containment structure, the most reliable results is obtained by a full 3D model. The ANSYS program is employed to predict the response of the structure. The major challenges for modelling the prestressing system is to accommodate parameters affecting prestressing forces. To introduce the prestressing forces, initial strains are applied to discrete tendon elements. Even though this approach increases the complexity of the problem; it represents the most realistic modeling of prestressing system. This method is more appropriate in comparison to the equivalent force approach in previous studies. Both methods are discussed and the results of UPC are compared together. It is observed that the CS investigated in this study meets the design requirement of the currents standards. The structure behaves linearly up to 1.5 design pressure and UPC is estimated as 2.3 times the design pressure. The response of the structure using the discrete model for the prestressing tendons and the equivalent prestressing force approach vary by