Japan reporter says mutations increasing in Fukushima. enenews.com China spends big on nuclear fusion as French plan falls behind. newscientists.com Defense Secretary Ashton B. Carter gave a surprisingly upbeat assessment on Wednesday of American relations with Saudi Arabia, asserting that the kingdom welcomed the international nuclear deal reached with its regional rival, Iran. nytimes.com The Ameren Corp. nuclear power plant in central Missouri was shut down for the second time in eight months Thursday after a "non-emergency" leak was found in the reaction control system. abcnews.go.com