Abstract
Nuclear facilities produce highly contaminated organic radioactive waste such as ion exchange resins for water purification in a nuclear plant. It is desired that these wastes will be decomposed to reduce the volume and become stable. Toshiba has developed an ion exchange resin treatment system using supercritical water. The supercritical water whose temperature and pressure exceed 647K and 22MPa is an excellent solvent for organic compounds, which can be decomposed. Actual plant size apparatus was constructed with a treatment capacity of 1 kg ion-exchange resin per hour. The reactor consists of an outer vessel and inner vessel, and the latter one was made of titanium that has anti-corrosion properties against sulfuric acid generated from resin decomposition. The reactor has a structure whereby the pre-heating part, the reaction part with a capacity of 0.025 m^3 and the cooling part are unified. The ratio of cation and anion resin is equal to one, and the concentration of resin in the slurry was 11wt%. The slurry of 9 L/h and air of 8 Nm^3/h were supplied to the reactor, and more than 99.9% of ion-exchange resin was decomposed at 723 K and 30 MPa.
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