The structure took 110 days to complete, 45 days ahead of schedule, Rosatom said. The containment acts as a hermetic protection system, designed to withstand high external and internal pressures and protect against radiation release.
In March 2022, workers completed welding of the main circulation pipeline connecting the reactor pressure vessel with the steam generators and the reactor coolant pumps.
Russia is building two VVER-1200 pressurised water reactor units at the Rooppur site, about 150 km from the capital Dhaka, under a general contract signed in 2015. Atomstroyexport, a Rosatom subsidiary, is the general contractor for the project.
The plants are the first commercial nuclear units to be bult in Bangladesh.
First concrete for Rooppur-1 was poured in November 2017 and for Rooppur-2 in July 2018.