Multichannel Model for Fuel-Coolant Interaction in a Liquid-Metal Fast Breeder Reactor Subassembly

A multichannel model and computer code for fuel-coolant interaction in a liquid-metal fast breeder reactor subassembly have been developed. The model takes into account the geometry of the subassembly and assumes a partial meltdown. Results obtained with the code show the influence of local initial perturbations. Furthermore, it is revealed that the common vapor space between the coolant and the molten fuel is the predominant coupling between the channels.