Structure for dissipating heat by natural convection, for packaging for transporting and/or storing radioactive materials

Structure for dissipating heat by natural convection, to be provided on the periphery of packaging for the transportation and/or storage of radioactive materials,

• the structure being characterised in that it has two adjacent half-structures each comprising primary fins that are parallel and inclined with respect to a direction of the height of the structure, the primary fins of the two half-structures forming, two by two, fins having the overall shape of an inverted V, when the packaging is arranged vertically with its bottom oriented downwards,
• the structure having the following parameters:
• H is the height of each half-structure, in the direction of the height along which the inclined primary fins are successively arranged, this height being between 2 and 5 m;
• h is the height of each primary fin, between 10 and 100 mm;
• d is the width of each primary channel for circulation of air defined between two directly consecutive primary fins, this width being between 10 and 50 mm;
• Ep is the thickness of each primary fin, satisfying the condition d/Ep≥2.5;
• L is the width of each half-structure in a transverse direction orthogonal to the direction of the height, said width L satisfying the following condition:
• 0.30·(0.35·H0.5·h0.6/d0.1)≤L≤3.5·(0.35·H0.5·h0.6/d0.1).