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MULTI-DIMENSIONAL APPROACHES IN SEVERE ACCIDENT MODELLING AND ANALYSES  

Fichot, F. (Institute de Radioprotection et de Surete Nucleaire Direction de la Prevention des Accidents Majeurs)
Marchand, O. (Institute de Radioprotection et de Surete Nucleaire Direction de la Prevention des Accidents Majeurs)
Drai, P. (Institute de Radioprotection et de Surete Nucleaire Direction de la Prevention des Accidents Majeurs)
Chatelard, P. (Institute de Radioprotection et de Surete Nucleaire Direction de la Prevention des Accidents Majeurs)
Zabiego, M. (Institute de Radioprotection et de Surete Nucleaire Direction de la Prevention des Accidents Majeurs)
Fleurot, J. (Institute de Radioprotection et de Surete Nucleaire Direction de la Prevention des Accidents Majeurs)
Publication Information
Nuclear Engineering and Technology / v.38, no.8, 2006 , pp. 733-752 More about this Journal
Abstract
Severe accidents in PWRs are characterized by a continuously changing geometry of the core due to chemical reactions, melting and mechanical failure of the rods and other structures. These local variations of the porosity and other parameters lead to multi-dimensionnal flows and heat transfers. In this paper, a comprehensive set of multi-dimensionnal models describing heat transfers, thermal-hydraulics and melt relocation in a reactor vessel is presented. Those models are suitable for the core description during a severe accident transient. A series of applications at the reactor scale shows the benefits of using such models.
Keywords
Severe Accident; Modeling, Heat Transfers; Thermalhydraulics; Melt Progression; Multi-dimensional; Porous medium;
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