Nuclear reactor problem a new headache for designer and China June 17 05:45 am JST June 17 | 06:45 am JST PARIS The emergence of problems in a new-generation nuclear reactor in China threatens to undermine efforts by its French designer to sell it elsewhere, and could hurt Beijing's nuclear industry, analysts said. French energy giant EDF and the Chinese government have sought to ease concerns about a gas build-up at the Taishan Nuclear Power Plant in southern Guangdong province after a CNN report of a potential leak at the site. Chinese nuclear safety and environmental authorities said Wednesday there has been an increase in radioactivity in one of the two power units due to five damaged fuel rods, but that it was a "common phenomenon" that doesn't warrant concern.