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Enhancing Nuclear Safety


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Validation of the Porous Medium Heat transfer model of ICARE/CATHARE code to debris bed and bundle "in pile" experiments


Congress title :Eurotherm81
Congress town :Albi
Congress date :04/06/2007

Document type > *Congrès/colloque

Keywords > bundle, debris bed, heat transfer, ICARE2, modelling, porous medium

Research Unit > IRSN/DPAM/SEMCA/LEIDC

Authors > EDERLI Stefano, REPETTO Georges

Publication Date > 06/06/2007

Summary

ICARE/CATHARE code is developed by the "Institut de Radioprotection et de Sûreté Nucléaire" to simulate the behaviour of a Nuclear Reactor during a core melting accident. The assessment of the heat transfer model in porous medium has been performed against experiments performed in ACRR (SNL-USA) and in Phebus reactors (at Cadarache -France). Calculation versus experiment results indicate a good agreement for the thermal behaviour. The heat transfers inside solid debris bed can be well predicted using the Imura-Yagi correlation to calculate the debris bed equivalent thermal conductivity in a wide range of particles size. In the case of "Rod like geometry" calculations, the fuel rod assembly was modelled assuming several rings of fuel rods, with heat transfer including radiative phenomena using view factors between rods. An alternative modelling has been used considering the fuel rods as a porous medium with with pure UO2 spherical particles of 1 cm diameter and a total porosity representative of the fuel bundle inside a cylindrical shroud. This modelling has been recently improved, to account for the heat transfer inside a fuel rod bundle, by a specific model based on an electrical analogy
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