The invention relates to an assembly (100) comprising a packaging (1) for storing radioactive materials, as well as its support system (3) comprising a radiative screen (20) for thermal protection of the ground, this screen comprising at at least one air passage (24) providing communication between a zone (32) of circulation of cooling air of the ground defined under a first face (28) of the screen, and a zone (34) of circulation of cooling air of the packaging bottom defined between a second face (30) of the screen and the packaging bottom (4). The support system (3) includes support members (36) of the package bottom, each projecting from the second face (30) of the radiative screen (20) and extending through the area (34). , and it also comprises support elements (38) projecting into the area (32). Figure for the abstract: Figure 1.
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