One of the external indicators of the way the melt and water are mixed during the stratified steam explosion process is the explosion duration. The duration of the stratified steam explosion was studied by the analysis of experimental observations in the PULiMS and SES (KTH, Sweden) tests using simulation results obtained with the MC3D code (IRSN, France) and applying the developed parametric stratified steam explosion model. The analysis showed that longer explosion duration for the experiments with strong explosions cannot be predicted solely by varying the premixed layer conditions. The observed discrepancies between the experimental results and simulations can be explained by the fact that in strong stratified steam explosions there is also significant melt-water layer mixing during the explosion propagation.
COBISS.SI-ID: 32558119
Based on the analysis of experimental results and theoretical research, we developed a modelling approach for the premixed layer formation in stratified melt-coolant configuration. The developed modelling approach was incorporated in the MC3D program (IRSN, France). To verify the adequacy of the incorporation of the modelling approach in the program, a number of numerical and physical test calculations were performed. The simulation results confirmed the suitability of the modelling approach for calculating the premixed layer formation in stratified melt-coolant configuration.
COBISS.SI-ID: 33178663