AFP: Environmental group Greenpeace sharply criticised Swiss power stations Tuesday for using nuclear fuel from a Russian reprocessing centre at Mayak, claiming it was one of the world’s most polluted. Greenpeace Switzerland said in an open letter to energy firm Axpo that executives had acknowledged “for the first time” that reprocessed nuclear fuel from Mayak was used in two nuclear power stations in central Switzerland. Mayak in central Russia reprocesses spent nuclear fuel rods …