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Why is enriched uranium needed for nuclear fission in power stations?

Question by : Why is enriched uranium needed for nuclear fission in power stations?
Why does it need to be enriched?

Best answer:

Answer by Scott Lenox
Because there are different Isotopes of Uranium. For Uranium to create a sustainable nuclear reaction it has to be mainly U-235, however in nature Uranium is mainly the U-238 Isotope, so we need to separate out the U-235 from the rest of the Isotopes.

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