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Fukuchi, Taira; Sanyoshi, Hirotaka; Yatogi, Hideo; Fukuari, Yoshihiro; Inami, Shinichi
Dai-7-Kai Saishori, Risaikuru Bukai Semina Tekisuto, p.170 - 171, 2011/01
no abstracts in English
Kawasumi, Hiroyuki; Sanyoshi, Hirotaka; Yatogi, Hideo; Fukuari, Yoshihiro; Inami, Shinichi
no journal, ,
In the ventilation facilities of the Tokai reprocessing plant, particle filters are generally installed both in air-intake and exhaust systems. In the air-intake system, atmospheric dust is filtered and the cleaned air is supplied into radiation controlled areas, whereas in the exhaust system, radioactive materials are filtered and discharge it to the environment. Because the filter of the exhaust system serves to prevent radiological release to the environment, a high-efficiency particle air (HEPA) filter that a decontamination factor is extremely high, is used for filtering radioactive particles. The HEPA filter is usually exchanged with new one when the filter is carried over with particles, or it is exchanged by the limit as an anti-aging deterioration measure in time. This report reviews the exchange period of a periodical filter by confirming the integrity of a filter installed in investigation and the enforcement of the past filter exchange results and reports the result that planned adequacy.
Watahiki, Kenji; Kawasumi, Hiroyuki; Yatogi, Hideo; Inami, Shinichi
no journal, ,
Off-gas of Tokai Reprocessing Plant, including gaseous radio-active element, has been emitted from main stack after through exhaust duct. There corrosion and crack at the part of the iron exhaust duct near the main stack. Repairing method was planned to be used iron plate covering the corroded and cracked area, which would be attached welded. To take into considering of reducing the weight of the attachment, much lighter materials namely carbon fiber reinforce polymer, CFRP, was applied except for the iron plate. Necessary numbers of layers of CFRP to be enough strength and inner pressure was calculated for designing. In order to achieve satisfying essential specification with workmanship, training for the workers was carried out using mock-up before the actual one. In this paper, we report the CFRP method is the efficient and effective method repairing corrosion and crack at the iron duct, in Tokai Reprocessing Plant.