The weight of one plate is over 4500 kg.

There will be a total of eighteen plates like that on the dome part of the reactor inner containment. As many again will be further installed on top. Thus, the structure will weigh over 150 tons. After the security, lighting and ventilation systems have been installed on the dome, the weight of the inner containment dome part will be over 350 tons.

The dome of the reactor containment is assembled on a special slipway, which consists of concrete columns and a metal frame. JSC Northern Construction Department and JSC MSU-90 has installed it.

After the dome part of the containment has been assembled and supplied with the required equipment, it will be installed on the reactor building. This will make it possible to complete the concreting of the nuclear island facilities.


Titan-2 Holding is the largest in the North-West group of companies, constructing the most important nuclear industry and power facilities. The company performs a full range of construction and installation works from engineering to commissioning.

Titan-2 Holding is the general contractor for the construction of the Leningrad NPP-2 power units. The Holding Companies perform all the civil, installation, and electrical works at a construction site. The works are carried out in the reactor, turbine, power supply, water supply, heat cogeneration buildings and other power unit structures.

The Holding is the main contractor for the construction of the Hanhikivi-1 NPP in Finland.