Abstract
Fuel coolant interaction is a phenomenon resulting out of the rapid and intense heat transfer following contact between a molten material and a coolant. FCI can result into a steam explosion which can cause rapid and intense heat transfer or energy release in a very small time; this can cause a strong dynamic pressure rise in the system. Steam explosion can threaten containment integrity in nuclear reactors, hence it is important to study them in detail. In this chapter, a systematic study on steam explosion with different simulants at low temperature (∼1500 °C) and at prototypic condition with different melt to coolant ratios has been described. It was found that, steam explosion occurs after a threshold melt to coolant ratio of 1:5. The phenomenology of steam explosion has been explained on the basis of conversion efficiency.
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