More than 100 cold-war era research reactors run on uranium pure enough to be used in a nuclear weapon. But switching to safer fuel isn't easy.
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Brumfiel, G. Non-proliferation: A nuclear exchange. Nature 467, 772–774 (2010). https://doi.org/10.1038/467772a
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DOI: https://doi.org/10.1038/467772a