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Amphos 21 is tasked with modeling for Posiva Oy's underground repository for spent nuclear fuel in Finland, marking the world's first such facility. The deep geological disposal project began in 2022 and is slated for completion by late 2026 or early 2027. It aims to improve safety assessments using advanced reactive hydrogeochemical modeling combined with the EuroHPC JU supercomputer, LUMI, which has computing power equivalent to 1.5 million laptops, to simulate subsurface processes over thousands of years.