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DOI: 10.1615/ICHMT.1995.RadTransfProcHeatMassTransfSevNuclReactAcc.450

J. C. Micaelli
DRN/DTP-Grenoble, France; C.E.A./C.E.N.-G. - STT/Equipe Mixte

Jean-Marie Seiler
Commissariat a l'Energie Atomique (CEA), DEN/DTP, 17 rue des Martyrs, 38054 Grenoble cedex 9, France

H. Bung
DRN/DMT-Saclay, France

C. Maunier
DRN/DMT-Saclay, France

J. M. Humbert
DRN/DMT-Saclay, France

F. Valin
DTA-Saclay, France

Gerard Cognet
Laboratoire d'Energetique et de Mecanique Theorique et Applique, U.A. CNRS Institut National Polytechnique de Lorraine, NANCY, France

A. Forestier
DRN/DER-Cadarache, France

I. Szabo
Technical University, Budapest

J. P. Van Dorsselaere
CEA/DRN, CE de Cadarache, 13108 St. Paul lez Durance, France

Y. Philipponneau
DEC-Cadarache, France


The analysis is devoted to the core-catcher concepts based on spreading with special emphasis for the EPR (European Pressurized Reactor) concept. The paper will present the general strategy of the work which has been derived from the ISTIR methodology initiated by NRC. Scenario analyses reveal that the corium may drain from the vessel in several steps under different forms (liquid jets or solid debris) with variable compositions and temperatures depending on accident sequences and time. Corium accumulations due to remelting of debris or overlapping of several flows are highly credible. Therefore the demonstration strategy is more directed to prove that accumulations will be limited and have consequences which are compatible with the core-catcher requirements. Real material spreading experiments are necessary to investigate the potential for formation of accumulations and tests with sustained heating are required (VULCANO). Coolability investigations must also be purchased (MACE). The papers will also focus on three specific items which are judged to be of importance: 1) the methodology used for the scaling of the spreading tests, 2) the necessity of coupling Thermalhydraulics, Metallurgy and Physico-Chemistry, and 3) the effect of the mechanical properties of the crust on the equilibrium height of an accumulation of molten corium.

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