PROCESS FOR ANODIC ELECTRO-DECONTAMINATION OF HOLLOW METAL BODY INTERIORS, ESPECIALLY THE TUBES OF NUCLEAR POWER STATION PRIMARY CIRCUITS AND PLANT FOR CARRYING OUT SAID PROCESS

摘要

Process and plant for anodic electro-decontamination of hollow metal body interiors, especially the tubes of nuclear power plant primary circuits. According to the invention, a phosphoric acid-based foam disposed in the space delimited by the inner surface of the hollow body to be decontaminated and a cathode-forming electrode (105) placed in said hollow body is subjected to electrolysis. Preferably, the phosphoric acid-based foam is produced by an associated unit (101) and continuously admitted in the counterflow tube in relation to the electrode's direction of movement inside the tube. Electrolysis of the foam is produced stepwise by causing the electrode to advance successively in said tube, or continuously by causing it to move slowly.