Abstract: The object of this invention is to provide a device and method for the dry intermediate storage of irradiated fuel elements. The apparatus includes a casing which includes tiered superposed modules made of thermally conductive material and having compartments for accommodating fuel elements with a heat sink arranged on a perforated support plate. The system includes a retaining system which includes a clearance space left between a top module of a tier and a support plate of a tier above the superposed module.

Abstract: The subject of the present invention is: a casing internal part (1) suitable for the dry intermediate storage of at least one irradiated fuel element. Said casing internal part (1) has a tiered structure which comprises at least two superposed modules (M1, M2, M3, M4), each of said modules (M1, M2, M3, M4), made of a material that is a good conductor of heat, with compartment(s) (2a, 2b) for accommodating said fuel element(s) in the central part and with at least one hollowed-out peripheral heat sink (3a, 3b), being arranged on a support plate (4) that is perforated to allow said fuel element(s) through; the perforated support plates (4) of said structure being positioned and assembled by means of a retaining system (5?+5+5?), with a clearance (J) left between the top of the module of one tier (Mi) and the perforated support plate (4) of the tier (Mi+1) immediately above; a temporary storage casing (10) equipped with such a casing internal part (1); and the corresponding temporary storage method.