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Pebble bed reactors could be another safer nuclear plant option. It can use an inert gas (such as nitrogen or helium) to circulate in the core and to spin the turbines. You can use a gas that cannot become radioactive, so a cooling leak will not be radioactive. Also, you don't get meltdowns since the reaction is self-limiting. As the core temperature rises, the reactor power decreases (and the temperature goes down). Each "pebble" is also stable enough that disposal could be easier too.