In the context of severe accidents, large R&D efforts throughout the world are currently directed towards ex-vessel corium behaviour. Among the mitigation means which can be envisaged, the European industries and utilities are considering the implementation of a core-catcher outside the reactor pressure vessel in order to prevent basemat erosion and to stabilize and control the corium within the containment. The CSC project focused on two key phenomena for external core-catcher efficiency, reliability and safety: spreading and coolability. An experimental programme, covering different scenarios and including both simulant and real materials provided a lot of results which now constitute a large database and which enabled the qualification of computer codes.

In the context of severe accidents, large R&D efforts throughout the world are currently directed towards ex-vessel cerium behaviour. Among the mitigation means which can be envisaged, the European industries and utilities are considering the implementation of a core-catcher outside the reactor pressure vessel in order to prevent basemat erosion and to stabilize and control the cerium within the containment.The CSC project focused on two key phenomena for external core-catcher efficiency, reliability and safety : spreading and coolability. An experimental programme, covering different scenarios and including both simulant and real materials provided a lot of results which constitute now a large database and which enabled the qualification of 2 computer codes. After a brief presentation of the project, this paper presents the results obtained.

In this paper, we describe a simulation made on an practical device used in the thin ceramic film technology. A modelisation of the double blade device is introduced and solved analytically and numerically. Different flow regimes with recirculation zones may occur depending on the geometrical disposition of the blades.

article, nous dbcrivons une modblisation d'un bcoulement de couchage utilisb dans la technologie de fabrication de films minces cdramiques utilisant la technique du « double couteau ».Les traitements analytique et numbrique permettent de mettre en bvidence des zones de recirculation et [es profils de vitesse en diffbrents points de l'bcoulement.