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Enhancing Nuclear Safety


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Modeling of radiative heat transfer during a PWR severe accident


Journal title : Nuclear Technology
Volume : 154
Issue : 2
Pagination : 194-214
Publication date : 01/05/2006

Document type > *Article de revue

Keywords > radiative exchange, severe accident

Research Unit > IRSN/DPAM/SEMCA/LESAG

Authors > FICHOT Florian, RUBIOLO Pablo, ZABIEGO Magali

Publication Date > 01/05/2006

Summary

The paper is a synthesis of a study on radiative exchanges in Pressurized Water Reactior (PWR) core undergoing a severe accident sequence. This work is based on the hypothesis that the reactor core is an optically thick porous medium, which is justified when comparing the radiation absorption length to the medium dimension. The diffusion approximation is then adopted to treat the radiation transport in the medium which geometry continuously evolves. Then, an homogenization procedure is applied to establish the expression of the radiative conductivity of the system. This conductivity is, in particular, function of the geometry of the system. Thus the rod swelling, the material flow down and the rod and structures collapse into fragments are taken into account.

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