Performance verification test on wet-blast type decontamination for the clearance

Hamada, Nobuyuki ; Watanabe, Junji; Higashiura, Norikazu ; Shime, Masanori

The manual type wet blast apparatus had been introduced to remove the surface contaminations of the radioactive waste, as the preprocessing for the clearance. Decontamination test had been carried out to survey the optimum condition for the decontamination with using specimens obtained from facilities and equipments which will be planned to be cleared. As the results, we confirmed that the apparatus has the performance to reduce the surface radioactive concentration on the inside of the tube to under the clearance level within relatively short time.