Study on Evolution Mechanism for Local Melting Accident of Dispersed Plate Fuel

Ding Wenjie; Huang Hongwen; Guo Haibing; Gao Jiao; Wang Shaohua; Ma Jimin

doi:10.13832/j.jnpe.2025.S1.0213

Volume 46 Issue S1

Jul. 2025

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Ding Wenjie, Huang Hongwen, Guo Haibing, Gao Jiao, Wang Shaohua, Ma Jimin. Study on Evolution Mechanism for Local Melting Accident of Dispersed Plate Fuel[J]. Nuclear Power Engineering, 2025, 46(S1): 213-219. doi: 10.13832/j.jnpe.2025.S1.0213

Citation:

Ding Wenjie, Huang Hongwen, Guo Haibing, Gao Jiao, Wang Shaohua, Ma Jimin. Study on Evolution Mechanism for Local Melting Accident of Dispersed Plate Fuel[J]. Nuclear Power Engineering, 2025, 46(S1): 213-219. doi: 10.13832/j.jnpe.2025.S1.0213

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Study on Evolution Mechanism for Local Melting Accident of Dispersed Plate Fuel

doi: 10.13832/j.jnpe.2025.S1.0213

Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, Sichuan, 621900, China

Received Date: 2025-01-15
Rev Recd Date: 2025-03-28
Publish Date: 2025-06-15

Abstract

Abstract

To understand the evolution process of plate fuel melting accident and prevent the continuous core fuel melting, the typical plate fuel research reactor JRR-3M was used as the research object, and the volume of fluid (VOF) method was coupled with enthalpy-porosity method to simulate the local melting and melt migration process of dispersed plate fuel after adjacent flow channels were blocked. The simulation results show that the evolution process of local melting accident is divided into four stages: temperature rise, melting, migration and solidification. Among them, the migration stage is extremely short and lasts less than 3 s, but it has a decisive influence on the accident expansion. In the migration stage, the melt migrates to the adjacent fuel plate in two ways: bottom gathering and middle droplet sputtering, and begins to solidify after being fully cooled by the adjacent fuel plate. After the high-temperature melt contacts the adjacent fuel plate, the temperature of the adjacent fuel plate cooling wall will rise rapidly to 500~600 K, far exceeding the boiling point of the coolant, which poses a burnout risk to the adjacent fuel plate. The established simulation method and the obtained simulation results can provide support for the safety analysis of plate fuel core melting accident.
- Plate fuel,
- Melting accident,
- Evolution mechanism,
- Numerical simulation

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References(16)

References

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