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The paper summarizes the main findings obtained since the beginning of the 1990's on the nonenergetic mixing behaviour of melt and water associated with the penetration of the molten corium into the residual water of the lower plenum. Three tests series involving Al(2)O(3) melt (PREMIX) and UO(2)-based corium melts (MIXA, FARO) are considered in the frame of this paper. In MIXA (AEA-Winfrith) up to 5 kg of molten thermite (81 w% UO(2) - 19 w% Mo) droplets with a diameter of about 10 mm at 3500 K are poured into saturated water at atmospheric pressure. In PREMIX (Forschungscentrum Karlsruhe), up to 20 kg of Al(2)O(3) at 2600 K are poured into saturated or slightly subcooled water at ambient pressue. In FARO (JRC Ispra) up to 150 kg-scale of UO(2)-ZrO(2)-(Zr) corium at 3000 K are poured into 1 m depth and 2 m depth saturated water at 5.0 MPa. The recalculations of these experiments by using the CHYMES, COMETA, IVA-KA, MC-3D and IFCI codes are presented and discussed. The progress made in understanding and modelling the phenomena, and the needs for further research are emphasized.

Additional information

Authors: MAGALLON D, JRC Ispra (IT);ANNUNZIATO A, JRC Ispra (IT);WILL H, Forschungscentrum Karlsruhe GmbH (DE);LUMMER M, Forschungscentrum Karlsruhe GmbH (DE);VATH L, Forschungscentrum Karlsruhe GmbH (DE);TURLAND B D, AEAWinfrith (GB);DOBSON G P, AEAWinfrith (GB);HORVATH G L, VEIKI Bundapest (HU);VALETTE M, CEA, CEN Grenoble (FR);VALISI M, ENEL Roma (IT)
Bibliographic Reference: Paper presented: FISA 95 Symposium EU Research on Severe Accidents, Luxembourg (LU), November 20-22, 1995
Availability: Available from (1) as Paper EN 39474 ORA
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