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Kosuge, Atsushi; Minehara, Eisuke*; Saruta, Koichi
no journal, ,
Decontamination is required when disposing of equipment contaminated by the accident at TEPCO's Fukushima Daiichi Nuclear Power Plant. The decontamination method generally used at present has a problem that a large amount of secondary waste is generated. Decontamination using a laser is non-contact and can significantly suppress the generation of secondary waste. In this study, we used a method of instantly evaporating and peeling using a continuous wave fiber laser, and observed the time change of peeling of the metal surface using a high-speed camera. Furthermore, a decontamination test was conducted using this laser decontamination method for the parts of the analyzer installed in Minamisoma City, Fukushima Prefecture, which was contaminated with radioactive substances.
Kosuge, Atsushi; Minehara, Eisuke*
no journal, ,
In the decommissioning of nuclear reactors, it is possible to reduce the amount of radioactive wastes and significantly reduce the storage cost by efficiently decontaminating the contaminated concrete used in the reactor building. Conventional decontamination methods have some disadvantages. Laser decontamination has been shown to be non-contact, remote-controlled, especially capable of a decontamination coefficient of 
100%, and significantly suppresses the generation of secondary wastes. Irradiation of the concrete surface with a laser causes the formation of a glass layer on the surface, thermal fracturing, and an explosive fracture by water and carbonate. In this study, we explain observations for elucidating the surface peeling mechanism of the concrete surface layer using high-speed scanning of a high-power density continuous-wave fiber laser.