If the entire US power grid was converted to nuclear energy, the US supply of radioactive material would last 30 years (at current rates of power consumption). Now sodium cooled reactors could extend that number a bit, but once those reactors reach the end of their life, the material left over is much more radioactive than what a hot water reactor creates. Good news is that more radioactive means a half-life in the hundreds of years (rather than hundreds of thousands). Unfortunately this spent material can't be safely moved.
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