That is assuming slow nuclear reactors, which is the case for the majority of the current reactors. But with fast reactors, you gain a factor of about 100, so t

That is assuming slow nuclear reactors, which is the case for the majority of the current reactors. But with fast reactors, you gain a factor of about 100, so the 200 years turn into 20000 [1] The big picture effect is that U238 is usable as fuel instead of just U235. There is over 100x more U238 in nature than U235, so the time that 200 years of uranium can last humanity turns into 20,000. [1] https://whatisnuclear.com/fast-reactor.html https://whatisnuclear.com/fast-reactor.html