In the new regulation formulated after the accident at Fukushima Daiichi Nuclear Power Plant, it is demanded that the glove box consists of incombustible or noncombustible materials. However, combustible acryl materials are used for many glove boxes installed in nuclear fuel cycle facilities. In this work, the glove box acryl panel has been replaced to incombustible material with accordance to the new regulation. The new panels have been manufactured by polycarbonate which satisfied the UL94 V-0 incombusti...
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Replacement of the Glove Box Panel in Nuclear Fuel Reprocessing Facility

Chloroprene rubber gaskets are often used to seal the glove box body and its panels. Such gaskets are deformed with compressive pressure and its elastic restoring force keeps sealing property. Therefore, gaskets play an important role in glove box sealing. However, physical properties of those used in glove box have not reported so far. In this study, hardness, elongation, tensile strength and compression set are investigated and its sealing performances are evaluated. The gaskets samples are taken fro...
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Physical property of seal-gasket for glove box panel in reprocessing facilities

Test equipment,containers,and analytical wastes,generated by experiments using spent fuel pieces in hot cell of Operation Testing Laboratory and by analysis of highly active liquid wastes in hot analytical cell line of Tokai Reprocessing Plant,are treated as highly radioactive solid wastes.These wastes are stored in specific shielded containers called waste cask and then transport to the storage facility.The treatment of these highly radioactive solid wastes have been carried out for 40 years with upgrading...
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Treatment technology of highly radioactive solid waste generated by experimental tests and sample analysis in reprocessing facilities

Radioactive liquid waste from the Tokai Reprocessing Facility Analytical Laboratory is temporarily stored in intermediate waste storage tanks by using receiving valves. Then, the liquid waste is transferred to liquid treatment facility by using liquid feed valves. The deterioration of the gasket part of these valves (leakage of waste liquid) was confirmed in 2004. Since then, the material of gaskets was changed from polyethylene to polytetrafluoroethylene(PTFE). In 2016, the gaskets were replaced by periodi...
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Physical property evaluation of valve seal material at analytical radioactive liquid waste storage tanks in reprocessing facility

Corroded pore was found at stainless pipe for liquid waste solution fro m the analytical laboratory. In order to find out the cause of corrosio , analytical samples were prepared cutting from the pipe. Reagents con ined chloride, which had been used analytical laboratory more than te years before the date, were found to be the trigger of the localized c rosion. We checked up all the pipes, which have been wasted including chloride solutions, by phased array instrument. We report the investig ion of cause o...
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Investigation into corrosion cause of the reprocessing facilities analysis waste fluid plumbing.

Corroded pore was found at stainless pipe for liquid waste solution from the analytical laboratory. Part of the pipe was cut for preparing samples to investigate the cause of the corrosion. The same size of stainless pipe was welded to recover it, under the strict radiation control. The restoration work was done inside of the vinyl house, as it is called “greenhouse”, which was the small room completely separated with outside by vinyl sheet. All the works, cutting, decontamination, digging groove and w...
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Restoration of the corrosion department of the reprocessing facilities analysis waste fluid plumbing.