Developments in the treatment of solid alpha-bearing wastes at the PNC plutonium fuel facilities

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大塚 勝幸*; 三代 広昭*; 大内 義房; 志賀 健一朗*; 武藤 正*

not registered; Miyo, Hiroaki*; Ouchi, Yoshifusa; not registered; not registered

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Some results of experiments donein PNC are presented on volume reduc-tion technics for alpha-bearing wastes. A pilot wood milling machine automatically mills the plywood frames of nipple connected HEPA filters, which result in fine sized wooden chips, two nipples and the filter components. The filter components are melted in an induction furnace to be homogeneous solids. These methods and incineration of wooden chips reduce the stored volume of HEPA filters to 1/501/100. PVC and neoprene rubber are decomposed in concentrated sulfuricacid, followed by oxidation with nitric acid. The acid digestion process generates chlorine-rich gas, from which only chlorine is selectively absorbed in water. An alpha-bearing vessel and aglove box are cut at their installed places without spread of plutonium contamination outside the greenhouses. *Presented at the Joint NEA/IAEA Technical Seminar on the Treatment, Conditioning and Storage of Solid Alpha-Bearing Wastes and CladdingHulls Paris, December 5-7, 1977