Steam explosion is one of the crucial and poorly understood phenomena which may occur during severe accident scenario and may lead to containment failure. In spite of several experimental and analytical studies, the r...Steam explosion is one of the crucial and poorly understood phenomena which may occur during severe accident scenario and may lead to containment failure. In spite of several experimental and analytical studies, the root cause of steam explosion has not been understood. Recent claims in the literature suggest that the presence of fine fragmentation during steam explosion causes its occurrence. In order to investigate this and understand the root cause of steam explosion, series of experiments were performed with 50 g to 2500 g of CaO-B<sub>2</sub>O<sub>3</sub>, a corium simulant in 4.5 litre of water. It was observed that steam explosion may occur even in the absence of fine fragments, which is contrary to the claims in the literature. To investigate further, conversion efficiency analysis was performed. This suggested that the amount of thermal energy converted to mechanical energy is more important deciding factor in explaining the occurrence of steam explosion. The present study discusses the importance of conversion efficiency in deciding steam explosion and also gives a new perspective to look at steam explosion phenomenology.展开更多
In order to study the mechanism of steam explosion caused by the interactionbetween coolant and melted metal drops with high temperature,the process of explosion generated by water following interaction with molten me...In order to study the mechanism of steam explosion caused by the interactionbetween coolant and melted metal drops with high temperature,the process of explosion generated by water following interaction with molten metal drops is carried out.In the experiment,liquid aluminum and water with different ratios and different temperatures were evaluated,and the influence of different water temperatures on the steam explosion was studied.The corresponding rules of steam explosion at the different experimental conditions were derived.The difference between experiment resultants was analyzed.The experimental results show that when the ratios of liquid aluminum to water are within a certain range,explosions maybe happen,and the higher the temperature of water is,the less likely explosions will occur while other conditions remain the same.The research results would provide an insight into controlling steam explosion.展开更多
文摘Steam explosion is one of the crucial and poorly understood phenomena which may occur during severe accident scenario and may lead to containment failure. In spite of several experimental and analytical studies, the root cause of steam explosion has not been understood. Recent claims in the literature suggest that the presence of fine fragmentation during steam explosion causes its occurrence. In order to investigate this and understand the root cause of steam explosion, series of experiments were performed with 50 g to 2500 g of CaO-B<sub>2</sub>O<sub>3</sub>, a corium simulant in 4.5 litre of water. It was observed that steam explosion may occur even in the absence of fine fragments, which is contrary to the claims in the literature. To investigate further, conversion efficiency analysis was performed. This suggested that the amount of thermal energy converted to mechanical energy is more important deciding factor in explaining the occurrence of steam explosion. The present study discusses the importance of conversion efficiency in deciding steam explosion and also gives a new perspective to look at steam explosion phenomenology.
文摘In order to study the mechanism of steam explosion caused by the interactionbetween coolant and melted metal drops with high temperature,the process of explosion generated by water following interaction with molten metal drops is carried out.In the experiment,liquid aluminum and water with different ratios and different temperatures were evaluated,and the influence of different water temperatures on the steam explosion was studied.The corresponding rules of steam explosion at the different experimental conditions were derived.The difference between experiment resultants was analyzed.The experimental results show that when the ratios of liquid aluminum to water are within a certain range,explosions maybe happen,and the higher the temperature of water is,the less likely explosions will occur while other conditions remain the same.The research results would provide an insight into controlling steam explosion.
