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Greenpeace is both halves of the name. While I agree that nuclear is green, IMO Greenpeace are correct about it not being compatible with the "peace" half: the stuff that makes working reactors is the most difficult part of making a working weapons. This also means that during the cold war they suspected of being soviet plants. Those suspicions and yours could both be correct for all I know.
I don't have sources and would appreciate if anyone has anything to offer on this.