Experiments of electro-polishing decontamination to design electro-polishing equipment

not registered ; not registered; not registered; Tanimoto, Kenichi

To decontaminate radioactive waste occurred in nuclear fuel facilities to minimize radiation dose level of the waste, electro-polishing method have been developed in JNC. In this paper, many experiments were performed to get data that were necessary to design electro-polishing equipment. Results of the examinations are as follows. (1)Distance between an electrode and flat board test piece was varied from 10 to 100 mm, electric current density was 0.2A/cm, and executing time was 20 minute. In above case, we measured polishing weight of both sides of the test piece to clear polishing distribution in waste surface. The longer the distance between two electrodes, the nearer weight of reverse side became to front side. In the case, best distance between the test piece with electrode is 100mm. (2)Using flat board, angle, pipe, and bolt, shape dependence test was performed. Over 10min. , all the test piece with any shape got a thickness of 10m or more. (3)The electro-polishing equipment ran 85 hour in our experiments. Because remarkable change was appeared in polishing weight and injection voltage over 50 hour, life time of electrolytic solution was 50 hour.