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Abstract

The objective of the project was to improve the understanding of the processes which govern molten corium quenching and early cooling in water, including steam explosion, and to validate the corresponding models to be applied to reactor case. The project mainly focused on the role of melt physical properties on melt stream fragmentation and mixing in water, and on steam explosion energetics. The ultimate goal is to be able to evaluate the quenching potential and the mechanical and thermal loads associated with molten fuel coolant interaction events that may result from a core melt down accident, either in- or ex-vessel. Appropriate accident management measures can then be designed in order to favour quenching and reduce the harmful consequences of such events.

The work was a continuation of the effort undertaken since the beginning of the 1990's on the studies of pouring conditions directly relevant to accident scenarios. Since then, significant progress has been made in understanding mixing and quenching without steam explosions. However, mixing and detonation model validation needed additional data, as the role of the melt physical properties on mixing and triggering of steam explosions revealed to be of particular importance in this respect. In particular, mild explosions were obtained with prototypical corium melt while very energetic steam explosions are easily triggered with alumina melt. .

Additional information

Authors: MAGALLON D, JRC-Ispra (IT);HUHTINIEMI I, JRC-Ispra (IT);DIETRICH P, IPSN, Fontenay aux Roses (FR);BERTHOUD G, IPSN, Fontenay aux Roses (FR);VALETTE M, IPSN, Fontenay aux Roses (FR);SCHTZ W, FZK, Karlsruhe (DE);JACOBS H, FZK, Karlsruhe (DE);KOLEV N, SIEMENS, Erlangen (DE);GRAZIOSI G, ANSALDO, Genova (IT);SEHGAL R, RIT, Stockholm (SE);BRGER M, IKE, Stuttgart University (DE);BUCK M, IKE, Stuttgart University (DE);BERG E V, IKE, Stuttgart University (DE);COLUMBO G, ENEA, Roma (IT);TURLAND B, AEA Technology, Winfrith (GB);DOBSON G, AEA Technology, Winfrith (GB);MONHARDT D, FRAMATOME, Paris (FR)
Bibliographic Reference: EUR 19567 EN (2000) 200 pp
Availability: Available free of charge from Documentation Service, DG Research
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