Verification of IVA5 computer code for melt-water interaction analysis: Part 1

In order to qualify IVA5 for applications in the field of the melt-water interactions in nuclear reactor safety, the author analyzed the achievable accuracy by predicting phenomena that are within this class. Comparison with a variety of experiments ranging from simple material relocation phenomena to highly violent explosions qualified IVA5 as a code representing the state-of-the-art in the field of the multiphase flows. The code is capable of predicting multiphase flow behavior in complicated geometries and industrial networks. The code is able to predict melt-water interaction in well quantified uncertainty region. Reducing the uncertainty band needs future sophistication in the directions specified in this work