The full-power demonstration test run of Sanmen Unit2 was completed at 21:17 on 5th, November, 2018. The reactor has now been "put into commercial operation conditions". 

In September 2007, the construction of four AP1000 units in China was permitted by the authorisation: two at Sanmen in Zhejiang province and two more at Haiyang in Shandong province. Construction of Sanmen 1 began in April 2009, while first concrete for Sanmen 2 was poured in December 2009.

The loading of fuel assemblies into its core began on 5 July. The unit achieved first criticality on 17 August. Sanmen 2 was connected to the grid on 24 August, and reached 100% power for the first time on 30 September.

The successful construction of the Sanmen nuclear power project is an important achievement in the development of China's third-generation of nuclear power plants, and will vigorously promote the industrialisation of China's independent passive nuclear power technology.