Prediction of Cold Dropping Behavior of Control Rod Based on Fluent

Liu Jiqiu; He Xiaojun; Dai Jigao; Wu Qi; Hao Sijia

doi:10.13832/j.jnpe.2024.10.0039

Volume 46 Issue 5

Oct. 2025

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Liu Jiqiu, He Xiaojun, Dai Jigao, Wu Qi, Hao Sijia. Prediction of Cold Dropping Behavior of Control Rod Based on Fluent[J]. Nuclear Power Engineering, 2025, 46(5): 109-114. doi: 10.13832/j.jnpe.2024.10.0039

Citation:

Liu Jiqiu, He Xiaojun, Dai Jigao, Wu Qi, Hao Sijia. Prediction of Cold Dropping Behavior of Control Rod Based on Fluent[J]. Nuclear Power Engineering, 2025, 46(5): 109-114. doi: 10.13832/j.jnpe.2024.10.0039

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Prediction of Cold Dropping Behavior of Control Rod Based on Fluent

doi: 10.13832/j.jnpe.2024.10.0039

Department of Reactor Engineering Technology, China Institute of Atomic Energy, Beijing, 102413, China

Received Date: 2024-10-05
Rev Recd Date: 2025-01-22

Available Online: 2025-10-15

Publish Date: 2025-10-15

Abstract

Abstract

Focusing on a new type of fuel control rod assembly, this study investigates its drop behavior during reactor emergency shutdown. Using the software Fluent for simulation, a three-dimensional model of a single control rod was established. By adopting the dynamic mesh technique and appropriate computational parameters, the variation curves of pressure inside the guide tube and control rod velocity over time during the dropping process were obtained. Through comparative analysis with experimental results from the literature, the rationality of the research method was verified. Finally, this method was applied to calculate the drop behavior of the new fuel control rod, and the influence of different rod diameters was analyzed. The results show that the drop time of the new fuel control rod meets the acceptance criteria for drop time in current mainstream pressurized water reactors, and the drop time increases as the rod diameter grows.
- New fuel control rod,
- Dynamic mesh technique,
- Dropping behavior

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References(10)

References

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