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It currently takes at least nine years of operation for a nuke to pay back the oil that has to go into producing and fueling it. As the ores are depleted, that goes up. We still don't know how many year's worth of oil it will take to keep the dead reactors and their waste away from the biosphere, but that's another expense the next generation won't be able to afford. Nukes are one of the least effective ways to save oil, and definitely the worst in terms of risk and deferred costs.
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