Data for: A method for predicting the structure of corium pool in lower plenum of reactor vessel

A method is designed to predict the structure of corium pool bases on U-Zr-O-Fe thermo-chemical reactions (Salay theory) and takes into account the accident progressions calculated by severe accident codes. Especially, the formation of light metal layer is not hypothetical and the conditions for a three-layer pool formation are described in this method. The heat flux distributions on the outside of reactor vessel are also analyzed. It is found that, the structure and heat flux of corium pool obtained by this method are unique while they are various because of the compositions in light metal layer is user input in MAAP5 code. Although the thickest and thinnest light metal layer are obtained in MAAP5 code, based on which the conservative heat flux cannot be obtained due to the heat flux of light metal layer is not always inversely proportional to its thickness, and this is inconvenient for judging the validity of in-vessel retention (IVR) strategy.本研究设计了一种基于U-Zr-O-Fe热化学反应（Salay理论）的熔融堆芯熔池（corium pool）结构预测方法，并考虑了严重事故程序（severe accident codes）计算得到的事故演化进程。特别值得注意的是，该方法并未对轻金属层的形成做出假设，且明确阐述了三层熔池形成的必要条件。同时，本方法还对反应堆压力容器外壁的热流密度分布进行了分析。研究表明，通过本方法得到的熔融堆芯熔池结构与热流密度具有唯一性；而在MAAP5程序中，由于轻金属层的成分由用户自定义输入，导致计算结果存在多样性。尽管在MAAP5程序中可得到厚度极值的轻金属层，但由于轻金属层的热流密度并非始终与其厚度呈反比关系，因此无法通过该结果获取保守热流密度值，这给堆内滞留（in-vessel retention, IVR）策略的有效性判定带来了不便。