The photo taken on Dec. 14, 2009 shows workers prepare at the construction site of the second of the two generating units of the Sanmen nuclear power plant in east China's Zhejiang Province. As the second of the two generating units of the Sanmen nuclear power plant was put into construction on Tuesday, China started the full scale construction of its first third-generation pressurized water reactors using AP 1000 technologies. The first phase project will include two units each with a generating capacity of 1.25 million kw. [Xinhua]