China's first nuclear power unit using Hualong One, a domestically designed third-generation nuclear reactor, has entered commercial operation, paving the way for mass production and export. The No. 5 unit in the city of Fuqing, east China's Fujian Province, is generating electricity for sale after a seven-day trial run, said the China National Nuclear Corporation (CNNC) Saturday. Follow Xinhua's Mi Yingting for a tour inside the facility in Fuqing. Produced by Xinhua Global Service