Numerical analysis of freezing controlled penetration behavior of the molten core debris in an instrument tube with MPS

Ronghua Chen; Yoshiaki Oka

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Numerical analysis of freezing controlled penetration behavior of the molten core debris in an instrument tube with MPS

机译：MPS法对管内熔融核碎片的冻结控制渗透行为进行数值分析

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The freezing controlled penetration behavior of the molten core debris in the BWR instrument tube had been analyzed with a two dimensional geometry under severe accident conditions using Moving Particle Semi-implicit (MPS) method. The change of melt viscosity with temperature in the phase transition region was taken into account in the present MPS method. Accordingly, in order to improve the computation speed of such highly viscous fluid, the implicit calculation scheme was employed to solve the viscous term in this study. The surface tension model based on the inter-particle potential force was incorporated in the MPS method to track the melt leading front more accurately. The present MPS method was validated first by simulating the experiment of molten aluminum oxide penetrating in a prototypical PWR instrument tube which was performed by EPRI. The comparison of the predicted penetration length and the measured results showed a good agreement selecting a parameter. Then the penetration and solidification behaviors of molten stainless steel and uranium dioxide in the BWR instrument tube were simulated under a wide parametric range. The computational results showed that the melt penetration length increased with the melt superheat, and the melt had plugged the tube in all simulations. The melt flow resistance increased due to the formation of the crust on the tube surface and the increase of melt viscosity in the phase transition region. The present results indicated that the typical melt penetration and solidification behavior in the instrument tube was successfully revealed by MPS method.

机译：使用移动粒子半隐式（MPS）方法，在严重事故条件下，通过二维几何分析了BWR仪器管中熔融核碎屑的冻结控制渗透行为。在本MPS方法中考虑了在相变区域中熔体粘度随温度的变化。因此，为了提高这种高粘性流体的计算速度，本研究采用隐式计算方案来求解粘性项。 MPS方法结合了基于粒子间势力的表面张力模型，以更精确地跟踪熔体的前导锋。首先通过模拟由EPRI进行的PWR原型管中熔融氧化铝的渗透实验，验证了本MPS方法的有效性。预测的穿透长度和测量结果的比较表明，选择参数具有很好的一致性。然后在宽参数范围内模拟了熔融不锈钢和二氧化铀在BWR仪器管中的渗透和凝固行为。计算结果表明，熔体渗透长度随熔体过热而增加，并且在所有模拟中，熔体都堵塞了管子。熔体流动阻力的增加是由于在管表面上形成了结皮以及相变区域中熔体粘度的增加。目前的结果表明，通过MPS方法成功地揭示了仪表管中典型的熔体渗透和凝固行为。

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《Annals of nuclear energy》 |2014年第9期|322-332|共11页
作者
Ronghua Chen; Yoshiaki Oka;
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Cooperative Major in Nuclear Energy, Graduate School of Advanced Science and Engineering, Waseda University, Tokyo 169-8555, Japan;

Cooperative Major in Nuclear Energy, Graduate School of Advanced Science and Engineering, Waseda University, Tokyo 169-8555, Japan;

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正文语种 eng
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关键词
MPS method; Solidification behavior; BWR instrument tube; Molten core debris;

机译：MPS方法;凝固行为;BWR仪表管;熔核碎屑;

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机译：MPS法对熔核与混凝土相互作用的地壳性状进行数值分析
5. On the effect of accident conditions on the molten core debris relocation into lower head of a PWR vessel. [D] . An, Xuegao. 1999

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8. Freezing Controlled Penetration of Molten Metals Flowing Through Stainless Steel Tubes [R] . Sienicki, J. J., Spencer, B. W., Vetter, D. L., 1985

机译：冷却控制渗透不锈钢管的熔融金属

Numerical analysis of freezing controlled penetration behavior of the molten core debris in an instrument tube with MPS

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