INVESTIGATION OF THE INTERACTION OF OXIDE MELT AND STEEL IN A WER-1000 VESSEL DURING A SERIOUS ACCIDENT

摘要

The results of investigations of the interaction of oxide melt with steel, which were performed following the international OECD program Masca, are presented. The experimental conditions simulated the high-temperature stage of a serious accident in a WER-1000 vessel. It is determined that the temperature range 2500-2600℃ oxide and metallic phases which are immiscible in the fused state form as a result of the interaction of underoxidized melts C-32-C-70 (U/Zr = 1.2). Fused iron is saturated with uranium, zirconium, and oxygen. The density of the metallic phase becomes greater than the density of the oxide melt, which causes the metallic phase to move to the bottom of the pool. The compositions of the coexisting oxide and metallic phases are determined. This can serve as a basis for constructing thermodynamic models of melts in the U-Zr-O-Fe system.