The fourth tier of inner containment of the reactor building was installed at power unit 1 of the Akkuyu NPP being under construction in Turkey

Pre-assembly of the IC fourth tier lasted 84 days. Sections with 11.3 meters in length and more than four meters in height were assembled as the single cylindrical structure fitted with reinforcement bars and embedded parts. The overall weight of the tier comprises 142 tons, height is more than 8 meters, circumference is 138 meters.

Installation of IC tier lasted 13 hours. The structure was installed using crane Liebherr LR 13000. With that, the height of the power unit 1 reached the elevation of 36.65 meters. This is the last IC cylindrical tier; elements of the dome part will be installed at the subsequent stages. IC peak will reach the elevation of +61.700 m.

Afterwards, the specialist will weld the third and the fourth tiers, perform reinforcement and installation of the embedded parts. Alongside with the construction of the inner containment the works are being performed in the reactor building consisting in erection of outer walls, reactor cavity, floor installation, installation of supports for steam generators.

Inner containment pertains to the main elements of the NPP safety system. IC protects the reactor compartment and serves as support for penetrations of pipelines and polar crane used for maintenance of the nuclear reactor at the stage of NPP operating. IC consists of steel lining, providing the leaktight integrity of the reactor compartment, and special-purpose concrete.

Reference:

The TITAN-2 Holding represents a group of Russian companies constructing the nuclear power facilities. Organisations of the Holding perform the whole cycle of works, from development of basic design documentation to facility commissioning.

The TITAN-2 Holding acts as the General Contractor responsible for construction of the new power units of the Leningrad NPP. At the construction site, the organisations of the Holding perform all civil construction, installation, and electric installation works.

The Holding is the Main Contractor at the construction of the Hanhikivi-1 NPP in Finland and of the Akkuyu NPP in Turkey as part of the Russian-Turkish Joint Venture T2IC.