BEIJING — China and the United States on Saturday signed an agreement that paves the way for Westinghouse Electric Co. to build four civilian nuclear reactors in China, a multibillion dollar coup for U.S. business over French and Russian competitors. A memorandum of understanding supporting the transfer of nuclear technology to China was signed by China's Minister for the National Development and Reform Commission Ma Kai and U.S. Energy Secretary Samuel Bodman. "This is an exciting day for the U.S. nuclear industry," Bodman said at the ceremony. "It is an example that if we work together we can advance not...