Abstract: An assemblable and disassemblable racking structure for the storage of radioactive fuel elements, comprising the juxtapositioning of vertical, parallelepipedic racks, at least two meshed networks of horizontal bars, one fixed to a base plate and the other assembled with the upper part of the racks, horizontal strips fixed to at least two sides of the rack level with each network and cooperating with the bars of each network in order to fix the racks, the assembly of the bars of the networks to one another and the bars of the lower network to the base plate being brought about by dismantlable fixing means. The invention also relats to the process for assembling the structure.

Abstract: Device for centering and guiding a roller for supporting a massive component, incorporating, on each bearing face of the supporting components, two centering surfaces and at least one rack which are arranged in the direction of movement of the roller. The centering surfaces and the rack which are associated with one bearing face are placed opposite the centering components and the rack associated with the opposite bearing face. The roller incorporates the cylindrical roller wheels and at least one pinion in positions corresponding to the centering surfaces and the rack. The invention applies, in particular, to anti-earthquake bearing devices for a housing for storage of nuclear fuel assemblies.