Core Catcher Vessel Installed at Akkuyu NPP Unit 2
Installation of the core catcher vessel into design position has been completed in the Reactor Building of Power Unit 2 of the Akkuyu NPP. The height of the
Installation of the core catcher vessel into design position has been completed in the Reactor Building of Power Unit 2 of the Akkuyu NPP. The height of the core catcher shell is 5.8 metres, diameter 6.1 metres, weight 169 tonnes. The vessel being the main part of the core catcher is a tank, which, in case of an emergency, will securely hold core melt within the sealed volume of the Reactor Building and prevent it from leaking in the environment. It is partially filled with a special material, which allows stopping chain reaction immediately and keeping core melt stable.
The next important stage in construction of Unit 2 reactor building will be installation of the first tier of inner containment into design position.
Cantilever truss shall provide protection of core catcher vessel and communications in hypothetical case of core melt-down. It is also designed for arrangement of communication lines - water supply, steam discharge, pass-through of communications for measurement instrumentation. Cantilever truss structure also provides special corridors for "catcher" inspection.
By virtue of the core catcher Akkuyu NPP shall be protected from any severe accidents. Previously, a similar "core catcher" has been installed at Akkuyu NPP Unit 1. These devices are used in modern nuclear power plants of Russian design with generation "3+" VVER-1200 nuclear reactors. The core catcher has maximum safety characteristics: increased seismic resistance, hydrodynamic and shock strength, flood protection and simplified installation technology.