At 23:58 of Dec. 3, the Unit 1 of Tianwan NPP entered the hot state formally, and began hot test.

On Nov. 30, the Unit 2 of Tianwan NPP began cool test on primary coolant loop. The pump of coolant storage system was started up to inject water into primary coolant loop, and the circulative flushing and cold test began formally. The pressure test on primary coolant loop was completed successfully at 16:32 on Dec. 11. Then the pressure test on secondary cooling system of Unit 2 got success at 13:40 on Dec. 13. The results of review and check met the criteria. It realized another important node target of construction schedule.