Nordic type boiling water reactors BWRs adopt reactor cavity flooding as a severe accident mitigation strategy SAMS to achieve core melt fragmentation and long-term cooling of decay heat generating core debris. The qualification of this SAMS needs to address two main severe accident issues: debris bed coolability and steam explosion. Hence, the first part of this thesis is concerned with characterization of melt jet breakup and resulting debris particles. The experiments reveal significant influence of melt superheat, water subcooling, melt jet diameter and material properties on debris size and morphology. Specifically, transition in debris size and morphology is found to occur at a specific water subcooling range. The difference in debris properties at varied melt release conditions is attributed to the competition between liquid melt hydrodynamic fragmentation and thermomechanical fracture of quenched particles. The second part of this thesis work is dedicated to provide a new understanding of steam explosion SE with the support of small-scale experiments at the level of droplets.
Tjusigt hotell och trevlig personal, Utmärkt läge och perfekta sk poolrum Deluxe Lagoon och det är bara ett måste på detta hotell.
Good morning, neighbors! It's Sunday as I write this, and the forecast is for it to stay Sunday all day long! Thank goodness, because day switches in the middle of a period of daylight are even more confusing than overnight clock switches! As for the weather, it'll stay mostly dry through Wednesday morning.
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