Dismantle the Stack is part of a unique project on construction of the protective arch over the Shelter object, which will make possible dismantling of the damaged unit of the Chernobyl NPP in the safest conditions.
A special feature of the project "Dismantling of ChNPP II stage Vent Stack" is that the main work is performed under ionizing radiation conditions.
The project participants developed a variety of activities for safe performance of work considering the existing hazards.
Vent Stack was on the roof of the Unit B , which is common to the 3rd and destroyed 4th power unit and lies between them at close range. The top point of the Stack was at the elevation +150.0 m. And the area for installation of the crane, intended for dismantling, is far removed from the work area.
The heavy-load crane DEMAG CC8800-1 of 1600 tons lifting capacity was used for dismantling.
Dismantling of the Stack was carried out in parts by blocks of 25 - 60 tons weight. Plasma cutting method was chosen for the Stack shaft and support structure cutting.
Additional information concerning this project one can find by the following references: