Abstract
The MARS test-facility represents a small scale replica of a Fast Breeder Reactor. This mock-up contains all the significant internal structures of a Fast Breeder Reactor block : core, core support structures, diagrid and diagrid support, neutron shielding, baffles, internal vessel, core catcher, core cover plug, pumps, intermediary and emergency heat exchangers... The external geometry of the reactor is also represented precisely : roof slab including openings for the passing of the components, rotating plugs, main vessel of variable thickness...
