Design and Experimental Study of Ultra High Pressure Water Jet Decontamination Device

Abstract

When nuclear facilities are overhauled or decommissioned, a high-pressure water jet removes radioactive contamination from the project site. During that process, a large amount of water needs to be used for better decontamination effects, producing secondary radioactive waste liquid, and indirectly increasing the cost of decommissioning nuclear equipment. According to the concept and washing devices of a high-pressure water jet, this paper designed a high-pressure water jet decontamination device controlling pressure and water flow desperately and simultaneously, which was enacted by PID automatic adjustment. The research results showed that higher water pressure achieved better decontamination effects. Meanwhile, under the same condition and influence factors, using a large volume of water achieved fewer decontamination factors, but the tendency changed gently. Therefore, an improved decontamination device with a higher-pressure water jet can control the water jet's output voltage and low flow. It is valuable for engineering applications that this achieved better effects on decreasing secondary waste and removing radioactive contaminations simultaneously.