Numerical Simulation of RPV with Complex Mechanical Behaviors under Core-melting Accident

Li Hui; Zhang Yixiong; Bai Xiaoming; Shao Xuejiao; Fu Xiaolong; Yu Mingda

doi:10.13832/j.jnpe.2024.S2.0168

Volume 45 Issue S2

Jan. 2025

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Article Navigation > Nuclear Power Engineering > 2024 > 45(S2): 168-173

Li Hui, Zhang Yixiong, Bai Xiaoming, Shao Xuejiao, Fu Xiaolong, Yu Mingda. Numerical Simulation of RPV with Complex Mechanical Behaviors under Core-melting Accident[J]. Nuclear Power Engineering, 2024, 45(S2): 168-173. doi: 10.13832/j.jnpe.2024.S2.0168

Citation:

Li Hui, Zhang Yixiong, Bai Xiaoming, Shao Xuejiao, Fu Xiaolong, Yu Mingda. Numerical Simulation of RPV with Complex Mechanical Behaviors under Core-melting Accident[J]. Nuclear Power Engineering, 2024, 45(S2): 168-173. doi: 10.13832/j.jnpe.2024.S2.0168

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Numerical Simulation of RPV with Complex Mechanical Behaviors under Core-melting Accident

doi: 10.13832/j.jnpe.2024.S2.0168

National Key Laboratory of Nuclear Reactor Technology, Nuclear Power Institute of China, Chengdu, 610213, China

Received Date: 2024-06-21
Rev Recd Date: 2024-09-23
Publish Date: 2025-01-06

Abstract

Abstract

After the severe loss of coolant accident (LOCA), the lower head of reactor pressure vessel (RPV) will be ablated by the core melt. Therefore, it is of great significance to simulate and analyze the ablation and complex mechanical behavior of the pressure vessel wall under the condition of core melt for the design, accident prevention and mitigation of RPV. This paper firstly presents the peridynamic formulation of coupling thermo-mechanical problem with crack propagation. Then, based on the peridyanmic framework, a simple and efficient moving boundary model is proposed. The abated status of the material points is directly characterized by introducing a scalar field, which makes it unnecessary to constantly update the calculation domain in the calculation process, thus improving the calculation efficiency. Finally, the present method is used to simulate the dynamic ablation of the core melt on the pressure vessel wall and the crack propagation of the pressure vessel under the action of internal pressure. The calculation results show that there are both elastic deformation and plastic deformation in RPV under the core melt accident, and there are also complex mechanical behaviors such as damage and fracture.
- Peridynamics,
- Coupling thermo-mechanics,
- Ablation,
- Moving boundary,
- Numerical simulation

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References(15)

References

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