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China starts up world's first fourth-generation nuclear reactor
(www.reuters.com)
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this post was submitted on 09 Dec 2023
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Have others been uneconomical?
Not at all, but long term storage of exhausted nuclear rods still costs an unknown amount of money endless centuries into the future. So you can't really put a number on the final bill.
Some types of reactors can also use those waste products as fuel and in turn make them into other waste products that only last a couple hundred years, so it's not a easy calculation to make unless you know what's deployed in the future.
Eh we’ll just dump em into the Sun someday if we start running out of space here on earth.
That has been suggested for decades, problem is that if any of the transporters blow up on their way to space, you essentially have a dirty bomb covering half the planet. No bueno.
It was usually old-style (insecure) and expensive, covered with hidden funding, or new tech (somewhat secure) and even more expensive.