Research on Percolation Models of UO<sub>2</sub> Fission Gas Release

Li Wenjie; Qi Feipeng; Sun Dan; Xin Yong; Li Quan; Li Yuanming

doi:10.13832/j.jnpe.2022.03.0226

Volume 43 Issue 3

Jun. 2022

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Li Wenjie, Qi Feipeng, Sun Dan, Xin Yong, Li Quan, Li Yuanming. Research on Percolation Models of UO2 Fission Gas Release[J]. Nuclear Power Engineering, 2022, 43(3): 226-231. doi: 10.13832/j.jnpe.2022.03.0226

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Li Wenjie, Qi Feipeng, Sun Dan, Xin Yong, Li Quan, Li Yuanming. Research on Percolation Models of UO₂ Fission Gas Release[J]. Nuclear Power Engineering, 2022, 43(3): 226-231. doi: 10.13832/j.jnpe.2022.03.0226

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Research on Percolation Models of UO₂ Fission Gas Release

doi: 10.13832/j.jnpe.2022.03.0226

1.
Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, 610213, China
2.
Nuclear Power Institute of China, Chengdu, 610213, China

Received Date: 2021-12-25
Accepted Date: 2022-04-13
Rev Recd Date: 2022-03-30
Publish Date: 2022-06-07

Abstract

Abstract

In order to analyze the dynamic process of intermittent release of fission gas caused by UO₂ fuel grain boundary bubble connection, so as to solve the problem that the radial release share predicted by the current diffusion model is inconsistent with the experimental measurement, a two-dimensional percolation model is used to simulate the evolution of UO₂ fuel grain boundary bubble network and the release process connected with the free space in the fuel rod. The results show that the percolation model predicts that the share of fission gas released along the radial direction of the pellet shows a local peak in the middle part of the pellet, and advances to the outside of the pellet with time, which is qualitatively consistent with the radial fission gas distribution phenomenon observed in the irradiation test under different burnups. Therefore, the percolation model established in this study can explain the radial non-monotonic distribution of fission gas release share of UO₂ fuel that could not be predicted by the previous percolation model from the mechanism.
- Simulation,
- Nuclear fuel,
- Fission gas release,
- Percolation

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References(14)

References

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