[jeherr]

We don't currently refine "spent" nuclear reactor fuel, in the US at least, which still contains significant amount of fissile material. When the fuel is "spent" we really just mean that the amount of fissile material is too low to sustain the nuclear reaction needed to collect energy. We would get more energy out of our uranium if we did, but instead we just let it become waste. Russia is very good about refining their uranium for nuclear power. We don't do it in the US for nuclear proliferation reasons. I'm less certain about the rest of the world on this though.

[ncmncm]

We don't refine waste because it costs more than refining mined uranium. Which itself costs a lot.

Everything around nukes is massively expensive -- building, fueling, operating. To the extent they steal money from building out renewables and storage, everything spent on them only adds to the climate crisis.

[jeherr]

If we're talking about the limit on the global supply only lasting us about 100 years, then it's irrelevant that it costs more now because the point is fissile material still exists and is a viable source for more energy beyond what the OPs projection was.

[ncmncm]

What is irrelevant is that fissile material is still available at enormous cost when the alternative, not paying for it, yields much more available power output.