中文摘要：

本文简要介绍美国三哩岛核电站堆芯熔化事故和前苏联切尔诺贝利核电站堆芯解体事故两类核电站严重事故所对应的事故历程，指出发生蒸汽爆炸潜因及其风险，熔融堆芯－冷却剂相互作用在一定条件下引起蒸汽的爆炸所涉及的主要热物理研究内容和作者开发的ＪＡＳＭＩＮＥ－ｐｒｏ多相流泛用数值计算程序原理。

英文摘要：

The potential causes and the risk of steam explosion are indicated through a brief discussion on the processes of the severe accidents at the nuclear power plants in the TMI in USA and the Chernobyl in former Soviet Union. The major research issues on the steam explosion and relevant thermal physical phenomena induced by the interaction between the melted reactor core and coolant under certain conditions are as well as the universal numerical computational principles of the multiple phase flows of the JASMI...