Those are for detecting nuclear reactor antineutrinos, to monitor plutonium-producing reactors associated with weapons programs. Not a pile of uranium sitting a

Those are for detecting nuclear reactor antineutrinos, to monitor plutonium-producing reactors associated with weapons programs. Not a pile of uranium sitting around doing nothing. e.g. https://www.nature.com/articles/s41467-019-11434-z https://www.nature.com/articles/s41467-019-11434-z