China’s Tianwan-5 attains first criticality

August 5, 2020, 7:30AMNuclear News

Reactor operators bring Tianwan’s Unit 5 to first criticality. Photo: CNNC

Unit 5 at the Tianwan nuclear power plant in China achieved initial criticality on July 27, marking “the completion of the commissioning of the overall system and equipment of the unit,” according to Jiangsu Nuclear Power Corporation, the plant’s owner and operator.

The first fuel loading for Unit 5 was completed on July 9, two days after China’s National Nuclear Safety Administration issued a 40-year operating license for the reactor. Grid connection is expected later this year, after which the unit will enter commercial operation.

Jiangsu Nuclear Power Corporation is a joint venture of China National Nuclear Power Corporation, Shanghai Hexi Power Investment, and Jiangsu Guoxin Group.

Tianwan in brief: Located in China’s Jiangsu province, Tianwan houses four AES-91 pressurized water reactors (Units 1 and 2 began commercial operation in 2007, with Units 3 and 4 coming on line in 2018), plus two 1,000-MWe domestically developed ACPR-1000 PWRs, Units 5 and 6 (Unit 6 is scheduled for startup in 2021). In addition, the construction of two VVER-1200 PWRs, Units 7 and 8, is scheduled to begin in 2021 and 2022, respectively, with completion in 2026 and 2027.


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