Abstract: A dry ice decontamination method and its equipment, with high decontamination efficiency, slight damage on matrices, and minimum of secondary waste, were developed to effectively decontaminate radioactive contaminations on surfaces of assemblies to be repeatedly utilized. An integrated system equipment of dry ice decontamination and gas cleaning was assembled, utilizing a dry ice cleaning technology for the decontamination of surface contamination and a closed loop design from blasting decontamination to collection of secondary wastes. Experiments of decontamination conditions were carried out using this equipment, and decontamination parameters of high efficiency and non-damage were obtained. The advantages of high decontamination efficiency, effect of aerosol cleaning, minimization of secondary waste were validated with the application of this new decontamination technology of dry ice blasting and offgas cleaning to decontaminate metal assemblies of in-place repeated utilization.

Key words: dry ice, radioactive contamination, decontamination, validation