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The economics of nuclear are good but not as good as you're implying.

It takes a long time and a lot of money to start earning on a nuclear plant. Given the risks involved it's not that easy to build one.

https://www.youtube.com/watch?v=cbeJIwF1pVY

I don't think firing nuclear waste into space would be wise either. The risk of that blowing up on launch is high and the fall out from that would be a disaster.

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Just imagine 10 years after you've built your nice new nuclear plant and someone makes a breakthrough on some form of cheap reliable energy. The current development focus on alternative forms of energy makes nuclear high risk purely due to the payoff period.

In the short term nuclear waste should be stored in remote sites on the earth, in the future it should all be moved to space by elevator rather than launch.

Nuclear waste is a non-issue.

All of the used fuel ever produced by the commercial nuclear industry since the late 1950s would cover a football field to a depth of less than 10 yards.

https://www.nei.org/fundamentals/nuclear-waste

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