Experiment Research on the Mechanism of Fuel Migration Behavior under Severe Accident of Lead-based Reactor
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摘要: 在铅基反应堆严重事故中，燃料颗粒在堆内迁徙过程中可能导致堆芯堵塞，存在重返临界的风险。为了获得液态铅铋合金（LBE）夹带金属颗粒的流动迁徙行为特性，本研究设计了石英玻璃可视化实验段，搭建了液态LBE夹带颗粒流动凝固行为可视化实验装置Eirene，开展了LBE在圆形通道内的流动凝固实验和LBE夹带不锈钢颗粒的流动凝固实验，获得了液态LBE流动凝固动态特性的影像数据、LBE进出口温度和管壁温度数据。由实验结果可知，颗粒球床的存在会严重阻碍LBE在玻璃管内的流动，且在球床密集区域极易形成凝固堵塞，大量颗粒停留在实验段中段，由外至内逐步形成堵塞。实验结果可为铅基反应堆严重事故分析模型验证提供支持。Abstract: In the severe accident of lead-based reactor, the fuel particles may lead to core blockage during the migration process in the reactor, and there is a risk of re-criticality. In this study, in order to obtain the flow and migration characteristics of metal particles entrained in liquid lead-bismuth eutectic (LBE), the visualization experimental section of quartz glass was designed, and the visual experimental device called Eirene for the flow and solidification behavior of LBE entrained particles was built. And the flow solidification experiment of LBE in a circular channel and that of LBE entrained stainless steel particles were carried out. The image data of flow and solidification characteristic of LBE, the temperature data of inlet, outlet and tube wall were obtained. The results show that the existence of metal particles seriously hinder the flow of LBE in the tube. It is easy to form solidification blockage in the dense area of the particle bed. A large number of particles are anchored in the middle of the experimental section and gradually form blockage from the outside to the inside. The experimental results can provide support for the verification of the lead-based reactor severe accident analysis models.
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图 3 Eirene-E1实验典型时刻结果
Figure 3. Snapshot of Eirene-E1 Test Results at Representative Moments
图 5 Eirene-E1实验段温度结果
Figure 5. History of Temperature of Experimental Sections in Eirene-E1 Test
图 8 Eirene-P1实验段温度结果
Figure 8. History of Temperature of Experimental Sections in Eirene-P1 Test
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