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为预测正常功率下快堆单个燃料组件的瞬间完全堵流导致的后续事故序列及其潜在的破坏能力,对模拟这种现象的SCARABEEBE+1实验在包壳流动之前的阶段进行了数值模拟。在此基础上对中国实验快堆(CEFR)在此事故工况下的冷却剂沸腾进行了预测。计算结果表明:对于CEFR,沸腾的过程中也出现了实验中观测到的出口处流量波动和通过组件盒的热流通量的快速增长。SCARABEEBE+1实验中,干涸发生之前,沸腾持续了大约2.2s;对于CEFR,沸腾开始后0.3s便发生了干涸。造成这一差异的主要原因是CEFR的燃料组件规模和单位体积的热功率更大。
In order to predict the sequence of subsequent accidents and their potential damage caused by instantaneous complete blockage of a single fuel assembly at a normal power, the SCARABEEBE + 1 experiment simulating this phenomenon was numerically simulated before the cladding flow. Based on this, the CEFR was predicted for coolant boiling under this accident condition. The calculation results show that for the CEFR, fluctuations in the flow rate at the exit observed during the experiment and rapid heat flux through the module box also occurred during boiling. In the SCARABEEBE + 1 experiment, the boiling lasted for about 2.2 seconds before drying occurred, and 0.3 seconds after boiling started to dry up for CEFR. The main reason for this difference is the larger fuel module size and thermal power per unit volume of CEFR.