I won't bother looking up figures as I'm not terribly interested in long term nuclear waste, but you're wrong about insurance (at least your argument is wrong, not necessarily the conclusion).
Implicit or explicit guarantee for extreme cases are worth trillions. There were some papers measuring how much even implicit guarantee was worth for Fannie Mae/Freddie Mae, and this was enormous amounts by letting them raise money far cheaper than would be otherwise possible (and taxpayers eventually paid, but it was beneficial to Fannie/Freddie long before that).
Do you consider the law regarding car liability insurance to be a subsidy? It requires you to carry liability insurance up to a finite amount, despite the fact that you can do much more damage than that with your car, and then bankruptcy law will shield you from paying the full amount.
This is the same kind of insurance nuclear plants have: they're require to have an insurance on up to $X of damages, and then "someone else" bears any cost beyond this.
Nuclear plants can't be insured for the damages in a meltdown. Not because the risk is so huge t...
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