Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Preliminary study on the thermal-mechanical performance of the U3Si2/Al dispersion fuel plate under normal conditions

  • Yang, Guangliang (School of Nuclear Science and Technology, University of Science and Technology of China) ;
  • Liao, Hailong (School of Nuclear Science and Technology, University of Science and Technology of China) ;
  • Ding, Tao (School of Nuclear Science and Technology, University of Science and Technology of China) ;
  • Chen, Hongli (School of Nuclear Science and Technology, University of Science and Technology of China)
  • Received : 2020.10.19
  • Accepted : 2021.05.11
  • Published : 2021.11.25
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Abstract

The harsh conditions in the reactor affect the thermal and mechanical performance of the fuel plate heavily. Some in-pile behaviors, like fission-induced swelling, can cause a large deformation of fuel plate at very high burnup, which may even disturb the flow of coolant. In this research, the emphasis is put on the thermal expansion, fission-induced swelling, interaction layer (IL) growth, creep of the fuel meat, and plasticity of the cladding for the U3Si2/Al dispersion fuel plate. A detailed model of the fuel meat swelling is developed. Taking these in-pile behaviors into consideration, the three-dimensional large deformation incremental constitutive relations and stress update algorithms have been developed to study its thermal-mechanical performance under normal conditions using Abaqus. Results have shown that IL can effectively decrease the thermal conductivity of fuel meat. The high Mises stress region mainly locates at the interface between fuel meat and cladding, especially around the side edge of the interface. With irradiation time increasing, the stress in the fuel plate gets larger resulting from the growth of fuel meat swelling but then decreases under the effect of creep deformation. For the cladding, plasticity deformation does not occur within the irradiation time.

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