Ultrasonic decontamination robot

Details Ultrasonic decontamination robot Ultrasonic decontamination robot

1982-12-27

1986-06-17

Caroff, Marc L.

Cleaning and liquid contact with solids

Processes

Including application of electrical radiant or wave energy...

134 18, 134 2218, 134 24, 376310, 901 41, 901 44, B08B 312

Patent

active

045954194

ABSTRACT:
An ultrasonic decontamination robot removes radioactive contamination from the internal surface of the inlet and outlet headers, divider plate, tube sheet, and lower portions of tubes of a nuclear power plant steam generator. A programmable microprocessor controller guides the movement of a robotic arm mounted in the header manway. An ultrasonic transducer having a solvent delivery subsystem through which ultrasonic action is achieved is moved by the arm over the surfaces. A solvent recovery suction tube is positioned within the header to remove solvent therefrom while avoiding interference with the main robotic arm. The solvent composition, temperature, pressure, viscosity, and purity are controlled to optimize the ultrasonic scrubbing action. The ultrasonic transducer is controlled at a power density, frequency, and on-off mode cycle such as to optimize scrubbing action within the range of transducer-to-surface distance and solvent layer thickness selected for the particular conditions encountered. The robot is also equipped with an ultrasonic position-sensing transducer for determining standoff distance.

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