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An employee or contractor at a nuclear power facility who has strange disfigurements, a weird speech impediment or is otherwise deformed, ugly or haggardly.

Sometimes abbreviated to just mutant when discussing within a nuclear power facility.
When I was leaving containment there was a Nuclear Power Mutant decontaminating our equipment, she looked like sloth from "The Goonies".
by IandCtechsATmillstone June 15, 2010
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