The disaster at Japan’s Fukushima Daiichi nuclear power plant in 2011 has prompted world leaders to slow or even suspend reliance on that source of energy. That’s left an open field for China to become one of the world’s top producers of nuclear power. As the traditional leaders in nuclear power have stagnated since the accident, in the same period China has added 10 new reactors capable of more than 10 gigawatts of generating capacity, according to the U.S.