Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 11, 2020 - November 13, 2020
The decommissioning of nuclear power plants is becoming a very important issue in the nuclear industry, as more and more nuclear power plants in Japan and abroad have been in operation for more than 40 years. In decommissioning, it is necessary to improve the decontamination technology for the structures of nuclear facilities to reduce the amount of radioactive waste to be managed and disposed of. In the decommissioning of the “Fugen”, which is the prototype of a advanced converter reactor that was shut down in 2003, a dry decontamination system for small diameter pipes, which are difficult to decontaminate, has been introduced on a trial basis and has been highly effective. However, the detailed decontamination mechanism of this dry decontamination device is not yet known, and basic research on this device is an important issue to be addressed in order to improve its efficiency and reliability. In this study, a dry decontamination machine was divided into two sections, one for blast polishing and the other for barrel polishing, and the results showed that blast polishing was more effective in decontaminating metal samples. The effect of blast polishing was measured at different angles of incidence, and it was found that blast polishing was most efficient at a projection angle of 45°, and it was confirmed that the effect of indentation rather than polishing increased as the angle was closer to 0°.
