Welding of the 160-tonne structure took 12 days after which the component was placed for three days in a special furnace operating at 650°C.
In a nuclear power plant, the RPV is one of the largest reactor components, a vessel containing the nuclear reactor coolant, core shroud, and the reactor core and fuel.
Atommash assembled the lower half of the RPV in May 2021 and the upper half in July 2021.
The Tianwan nuclear power station in Jiangsu province, east China, has six nuclear units in commercial operation and two under construction.
Russia supplied its VVER-1000 pressurised water reactor technology for Tianwan-1, -2, -3, and -4. Tianwan-5 and -6 are domestic CNP-1000 PWR units.
Tianwan-7 and -8 will both be Russia-made VVER-1200 Generation III+ pressurized water reactor units under agreements signed in 2018 and 2019. Construction began in 2021 and 2022.