28 December 2020 - Büyükeceli, Mersin, Turkey. The first tier of the inner containment shell (ICS) has been installed on Unit 2 of the Akkuyu NPP, the first nuclear power plant in Turkey. The support truss, which is one of the most important elements of the reactor shaft equipment, has been installed on Unit 1.


The installation operation of the first tier of the ICS with the use of tower cranes took 7 days. Installation was carried out in separate sections, each of which consists of a cladding sheet and a frame designed to ensure spatial rigidity. 10 such sections have been installed in total, each with a height of 5.7 m and a mass of about 7.5 tons. Upon completion of the installation, the height of the pressurized volume of the reactor building of Block No. 2 increased to a mark of +4.950 m. At the next stage, the sections of the first tier will be welded together.


The inner containment is one of the key elements of the containment safety system of the reactor compartment. It ensures imperviousness inside the reactor building under any operating conditions of the nuclear power plant.


The installation of the support truss, a welded metal structure weighing 145 tons, consisting of radial beams, which are poured with special concrete, have been completed on the power Unit 1 by using Liebherr LR 13000 heavy crawler crane. The truss with an outer diameter of 9.16 m is made of carbon steel and is designed to securely fix the reactor in the concrete shaft. The support truss is capable of protecting the reactor from any weight and seismic loads under all operating modes of NPP. The installation of the truss took a total of 6 weeks, of which 3 weeks were spent on the pre-assembly of the structure. Further, it is planned to carry out the concreting of the reactor shaft up to +16.500 m and the installation of the thrust truss on Unit 1, which is designed to fasten the reactor vessel at the upper level.


I am pleased to note that this year we have completed all the key processes planned by the Akkuyu NPP construction schedule. Installation operations of the first tier of the ICS on the Unit No. 2 and the support truss on the Unit 1 were carried out under the normal operation mode, there have been no nonconformities regarding the work of the installation personnel, the quality of the work have been confirmed by a special commission, whose members accepted the installation work. I am sure that in the next year we will continue to move forward keeping up the pace,” said Sergei Butckikh, First Deputy General Director - Director of the NPP under construction.