Acts for the decontamination of the materials removed during the dismantling of the systems and components installed in a nuclear power plant.
The Robotic Blastrooms Decoblast have the objective of maximizing the quantity of releasable materials without radiological constraints and minimizing the quantity of primary and secondary waste produced by decontamination activities.
The sandblasting is carried out by means of a special robot moved from the inside of a control room. The operator, by means of a joystick, can adjust the arm to the sandblasting cell at will, to work on the piece to be decontaminated in the most appropriate way.
The sandblaster is able to completely remove the present oxide layer ensuring the removal of the contaminated surface up to the white metal, with Sa3 degree.
The suction system of the abrasive material and air filtration is designed to ensure the absolute tightness of the system to avoid the leakage of potentially radioactive dust.
Through appropriate ducts, the air is sucked from top to bottom by the chamber suction floor with a speed of about 25 m / sec. and 140 air changes per hour.
This allows to obtain both the necessary depression in the chamber and an air current able to recover the abrasive and always maintain 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 shutters designed to compensate for the clogging of the filters.
The ventilation system, which the decontamination chamber is equipped with, is equipped with centrifugal fans, self-cleaning cartridge filters and absolute filters, with 99.99% efficiency for removing dust and preventing any trace of radioactive dust from being accidentally introduced into central ventilation.