Storage system for radioactive materials; comprising: - a canister (4) containing radioactive waste; - a container (C), provided with an enclosure (1), a base (2) and a lid (3), and a passive helical convection ventilation system provided with: lower air inlets (5); an air circulation zone (6) between the canister (4) and the inner surface of the container (C), and upper air outlets (7). The inlets (5) and outlets (7) present a decreasing variation of section in the air circulation direction, are curved and are oriented in an oblique direction with respect to the radial direction of the container, the air between said inlets (5) and outlets (7) describing an ascending helicoidal trajector

Storage system for radioactive materials; comprising: - a canister (4) containing radioactive waste; - a container (C), provided with an enclosure (1), a base (2) and a lid (3), and a passive helical convection ventilation system provided with: lower air inlets (5); an air circulation zone (6) between the canister (4) and the inner surface of the container (C), and upper air outlets (7). The inlets (5) and outlets (7) present a decreasing variation of section in the air circulation direction, are curved and are oriented in an oblique direction with respect to the radial direction of the container, the air between said inlets (5) and outlets (7) describing an ascending helicoidal trajectory around the capsule or canister (4).

The subject matter of the invention is a storage system for radioactive materials, comprising: a capsule or canister containing radioactive materials; an outer container housing the said canister; and a ventilation system provided with air inlets and outlets configured in the container to ensure helical upward ventilation, by convection, inside the container and around the said canister.

The invention also includes a specific canister, configured by a continuous succession of materials, expressly arranged to optimize the shielding efficiency against gamma and neutron radiation.

This invention is applicable in the sector dedicated to the storage of radioactive waste, e.g. from nuclear power plants, such as radioactive wastes, e.g. from nuclear power plants, such as: spent fuel, activated materials or others that can be considered as a source of radioactive emission.
 a source of radioactive emission.