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Longevity for Sustainability

Nuclear fuel is in the form of sintered uranium dioxide (UO2) pellets (cylindrical shape of about 1 cm in diameter and 1 cm long). These are stacked into fuel rods, and 235 rods are arranged in a fuel assembly. The reactor core consists of 121 fuel assemblies with enriched uranium‑235 (to a maximum of 5%, the rest is uranium-238). The new fuel assembly weighs between 500 and 600 kg and it is approximately 4 m high.