Abstract The melt pool could form in the nuclear reactor lower plenum under a hypothetic severe accident. In such condition, remaining the integrity of reactor pressure vessel (RPV) is treated as one of the severe accident management strategies. The investigation of melt pool natural convection behavior is one of the most important aspects in the in-vessel retention (IVR) investigation. Various experimental and numerical research regarding the internally heated melt pool natural convection behavior has been conducted before. However, there is a lack of comprehensive investigation of internally heated melt pool natural convection behavior. The numerical investigation of the internally heated melt pool natural convection behavior with the consideration of different high internal Rayleigh numbers is conducted in this work. This work could bring the reference for the further investigation of internally heated molten pool natural convection behavior.

中文翻译：

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考虑不同高内瑞利数的内热熔池自然对流行为数值研究

摘要 在假设的严重事故下，核反应堆下腔室可能会形成熔池。在这种情况下，保持反应堆压力容器（RPV）的完整性被视为严重事故管理策略之一。熔池自然对流行为的调查是容器内滞留 (IVR) 调查中最重要的方面之一。之前已经进行了关于内部加热熔池自然对流行为的各种实验和数值研究。然而，缺乏对内部加热熔池自然对流行为的全面调查。在这项工作中进行了考虑不同高内部瑞利数的内部加热熔池自然对流行为的数值研究。