Steam explosion experiments revealed that there is a significant influence of the melt material properties on the fuel coolant interaction process. A reason for this observed significantly different behaviour for different melts could be the probably different melt droplets freezing due to different melt material properties. A melt droplets solidification model, by which the growth of the solid crust on the droplets surface during the premixing phase may be simulated, was developed with corresponding melt droplets fragmentation criteria.
COBISS.SI-ID: 23573287
An improved solidification influence modelling approach for Eulerian fuel-coolant interaction (FCI) codes was developed together with corresponding melt drop break up criteria. The developed models were implemented into the advanced FCI code MC3D in an appropriate conservation form.
COBISS.SI-ID: 24021799
To improve the determination of heat and mass transfer in fuel-coolant interaction codes appropriate knowledge of the conditions inside the melt droplets is needed. A simplified mathematical model for the determination of the melt droplet conditions is introduced, considering the material physical properties of the melt droplet. Since the computational demand of the mathematical model would significantly increase the overall computational time of the fuel-coolant interaction codes, a simplification based on the temperature profile approach is presented. The model is simple enough to be practical for the implementation into computer codes and complex enough to consider adequately the material properties.
COBISS.SI-ID: 25895719
The KROTOS steam explosion experiments revealed important differences in the energy conversion efficiency among the melts. In the presented research we have focuses on the solidification effect which influences directly the strength of the steam explosion. An improved solidification influence model was developed and implemented into the MC3D code. For the assessment of the model the KROTOS alumina K44 and corium K53 explosion experiments were selected and simulated. The simulations support the key role of the solidification in the steam explosion phenomenon.
COBISS.SI-ID: 25534247