Originally Posted by
rower
You can not use nuclear power to extract hydrogen from water or fossil fuels because all methods we know today are inefficient.
You have to generate 3 kWh of electricity in a nuclear plant to obtain hydrogen that, as fuel for a vehicle, will produce just 1 kWh of mechanical work.
And most nuclear power plants make about 3 kWh of thermal heat which generates 1 kWh of electricity. So, about 1 kWh of mechanical work for every 9kWh of power from the nuclear core.