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

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: 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.