Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Failure analysis of prestressed concrete containment vessels under internal pressure considering thermomechanical coupling

  • Yu-Xiao Wu (Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast University) ;
  • Zi-Jian Fei (Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast University) ;
  • De-Cheng Feng (Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast University) ;
  • Meng-Yan Song (China Nuclear Power Engineering Co., Ltd)
  • Received : 2023.04.30
  • Accepted : 2023.08.12
  • Published : 2023.12.25
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Abstract

After a loss of coolant accident (LOCA) in the prestressed concrete containment vessels (PCCVs) of nuclear power plants, the coupling of temperature and pressure can significantly affect the mechanical properties of the PCCVs. However, there is no consensus on how this coupling affects the failure mechanism of PCCVs. In this paper, a simplified finite element modeling method is proposed to study the effect of temperature and pressure coupling on PCCVs. The experiment results of a 1:4 scale PCCV model tested at Sandia National Laboratory (SNL) are compared with the results obtained from the proposed modeling approach. Seven working conditions are set up by varying the internal and external temperatures to investigate the failure mechanism of the PCCV model under the coupling effect of temperature and pressure. The results of this paper demonstrate that the finite element model established by the simplified finite element method proposed in this paper is highly consistent with the experimental results. Furthermore, the stress-displacement curve of the PCCV during loading can be divided into four stages, each of which corresponds to the damage to the concrete, steel liner, steel rebar, and prestressing tendon. Finally, the failure mechanism of the PCCV is significantly affected by temperature.

Keywords

Acknowledgement

The authors greatly appreciate the financial support from the Project of National Key Research and Development Program of China (Grant No. 2022YFC3803004), the Natural Science Foundation of Jiangsu Province (Grant No. BK20211564), and the National Natural Science Foundation of China (Grant No. 52078119).

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