The US wants to build a different kind of nuclear reactor from a decades-old concept that could power ships and other off-the-grid locations
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Most nuclear reactors use water as a coolant. Molten-salt reactors use salts with higher boiling points. Kairos Power is set to build the US's first in decades.

One study suggested that the reactors could produce more nuclear waste than current systems and that they “will use highly corrosive and pyrophoric fuels and coolants that, following irradiation, will become highly radioactive.”