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It is necessary to find the method for solving the treatment problem of mixed radioactive waste generated from the nuclear facilities, because of disposal space limitations, maximum volume reduction was desired and a stable, leach resistant final waste form was need. We concluded that the D.C Graphite Arc Melter is the most effective method to be capable of processing mixed radioactive waste. This study was carry out for evaluation of concentration and removal efficiencies of the plasma arc melter (PAM) vitrification system for dioxin and off-gas, such as polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs), NOx, CO, SOx, THC, CO2. After manufacturing surrogate wastes similar to radioactive wastes produced in Nuclear Power Plants, the concentration of dioxin was measured to verify that Plasma Graphite Arc Melter would be proper for radioactive waste treatment. Test results showed that the concentration of all hazardous gas released from stack was below environmental regulatory limits. The concentration of dioxin emission gas in stack was 0.022 ng-TEQ/Nm3, 0.014 ng-TEQ/Nm3, 0.012 ng-TEQ/Nm3 and the average concentration was 0.016 ng-TEQ/Nm3. This value is almost equivalent to a sixth of dioxin limits value, 0.1 ng-TEQ/Nm3. The PAM system is evaluated that it can properly treat low and medium level radioactive wastes through analysis of produced off-gas in the course of melting various wastes.

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