Modélisation de l'interaction entre le coeur fondu d'un réacteur à eau pressurisée et le radier en béton du bâtiment réacteur

Abstract : Severe accidents of nuclear power plants are very unlikely to occur, yet it is necessary to be able to predict the evolution of the accident. In some situations, heat generation due to the disintegration of fission products could lead to the melting of the core. If the molten core falls on the floor of the building, it would provoke the melting of the concrete floor. The objective of the studies is to calculate the melting rate of the concrete floor. The work presented in this report is in the continuity of the segregation phase model of Seiler and Froment. It is based on the results of the ARTEMIS experiments. Firstly, we have developed a new model to simulate the transfers within the interfacial area. The new model explains how heat is transmitted to concrete: by conduction, convection and latent heat generation. Secondly, we have modified the coupled modelling of the pool and the interfacial area. We have developed two new models: the first one is the liquidus model, whose main hypothesis is that there is no resistance to solute transfer between the pool and the interfacial area. The second one is the thermal resistance model, whose main hypothesis is that there is no solute transfer and no dissolution of the interfacial area. The second model is able to predict the evolution of the pool temperature and the melting rate in the tests 3 and 4, with the condition that the obstruction time of the interfacial area is about 105 s. The model is not able to explain precisely the origin of this value. The liquidus model is able to predict correctly the evolution of the pool temperature and the melting rate in the tests 2 and 6
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Mathieu Guillaumé. Modélisation de l'interaction entre le coeur fondu d'un réacteur à eau pressurisée et le radier en béton du bâtiment réacteur. Autre. Institut National Polytechnique de Lorraine, 2008. Français. ⟨NNT : 2008INPL107N⟩. ⟨tel-01753045⟩

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