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Originally Posted by Laurentiu
are you referring to fly ash ?
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Nope. All rock is radioactive*. Matter of fact, so's everything else. So get over the "Omigawd it's radioactive, we're all gonna DIE!" hysteria, and figure out if the amount & type of radiation is harmful.
So here you've built - at great expense - a big concrete containment (note the root there: contain) in which you put a nuclear reactor. You run the reactor for 40 years or so, then tear everything down and ship it to a nuclear waste dump? Why not refurbish the current reactor, or put a next-gen one in the existing structure?
*It's said that Britain's nuclear power plant workers couldn't vacation in Cornwall, because the natural radioactivity from the rock there would exceed their permitted dose.