Suitable for the decontamination of materials removed during the dismantling of systems and components installed in a nuclear power plant.
The DECOBLAST robotic sandblasting chambers aim at maximizing the quantity of materials that can be released without radiological constraints and minimizing the quantity of primary and secondary waste produced by the decontamination activity. Sandblasting is carried out using a special robot moved from inside a control room.
Using a joystick, the operator can orient the arm in the sandblasting cell as he wishes, to operate on the piece to be decontaminated in the most appropriate way.
The sandblaster is able to completely remove the oxide layer present ensuring the removal of the contaminated surface up to the white metal, with grade Sa3.
The suction system of the abrasive material and air filtration is designed to guarantee the absolute hermetic seal of the system in order to avoid the leakage of potentially radioactive dust.
Through appropriate ducts, the air is sucked from top to bottom by the suction floor of the chamber with a speed of about 25 m/sec. and 140 air changes every hour.
This makes it possible to obtain both the necessary depression in the chamber and an air current capable of recovering the abrasive and always maintaining excellent visibility during the decontamination of the materials. The air intakes, designed to create the depression inside the chamber, placed on the roof of the same, include high efficiency panel filters (Hepa) and modular dampers designed to compensate for filter clogging.
The ventilation system, which the decontamination chamber is equipped with, is equipped with centrifugal fans, self-cleaning cartridge filters and absolute filters, with an efficiency of 99.99%, in charge of dust abatement, preventing any trace of radioactive dust from being accidentally introduced into the central ventilation.