In the ventilation facilities of the Tokai reprocessing plant, particle filters are generally installed both in air-intake nd exhaust systems. In the air-intake system, atmospheric dust is filtered and the cleaned air is supplied into adiation control led areas, whereas in the exhaust system, radioactive materials are filtered and it is discharged to thevironment. Because the filter of the exhaust system serves to prevent radiological release to the environment, a igh-efficiency particle air (HEPA) filter ...
英字タイトル:
Optimization of the exchange period of high efficiency particulate air filter in Tokai Reprocessing Plant

The Tokai Reprocessing Plant has recovered nuclear materials from spent nuclear fuel. Reprocessing process is consisted of shearing process, a dissolution process and an extraction process etc. Each facilities designed to confine radioactive materials in controlled area to keep negative pressure using ventilation system. This system has been used over 40 years. We analyzed influences to the trouble of aging equipment, and we considered necessary additional check out system to prevent troubles based on ...
英字タイトル:
Maintenance for ventilation system of The Tokai Reprocessing Plant

Off-gas of Tokai Reprocessing Plant, including gaseous radio-active elements, has been emitted from main stack after through exhaust duct. There were corrosion and crack at the part of the iron exhaust duct near the main stack. Repairin g method was planned to be used iron plate covering the corroded and cracked area, which would be attached and welded. To take into considering of reducing the weight of the attachment, much lighter materials namely carbon fiber reinfo rce polymer, CFRP, was applied except ...
英字タイトル:
Adaptation of the main duct maintenance technology used by Carbon Fiber Reinforce Polymer (CFRP)