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研究堆芯熔融物对压力容器壁面的动态烧蚀,对于反应堆冷却剂严重丧失事故(Loss of coolant accident,LOCA)后果的预测以及缓解方案的设计具有重要意义。本文以AP600为研究对象,在假设冷却剂全部丧失事故工况下,采用堆芯熔融物两层结构模型,计算熔池对壁面的加热;建立压力容器壁面的非稳态二维传热模型,并考虑安全壳水池对压力容器外侧的冷却,采用移动边界模型模拟烧蚀引起壁面局部厚度变薄;计算了堆芯熔融物坍塌后15 000 s范围内,压力容器下封头壁面温度和厚度的变化。
Studying the dynamic ablation of core melt on the pressure vessel wall is of great significance for the prediction of the LOCA consequences and the design of mitigation schemes. In this paper, taking AP600 as the research object, the two-layer structure model of the core melt was used to calculate the heating of the wall on the assumption of all the accidental coolant loss. The unsteady two-dimensional heat transfer model of the pressure vessel wall was established, Considering the cooling of the outer side of the pressure vessel by the containment pool, the moving boundary model was used to simulate the ablation of the wall to make the thickness of the wall thinner. The temperature and thickness of the bottom wall of the pressure vessel within 15 000 s after the collapse of the core melt Variety.