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Yamada, Tomonori; Suzuki, Hiroshi; Hanari, Toshihide; Shibata, Takuya; Nishimura, Akihiko; Koyama, Shinichi; Daido, Hiroyuki; Shimada, Yoshinori*; Kotyaev, O.*; Kurahashi, Shinri*
no journal, ,
no abstracts in English
Yamada, Tomonori; Hanari, Toshihide; Shibata, Takuya; Nishimura, Akihiko; Koyama, Shinichi; Daido, Hiroyuki; Shimada, Yoshinori*; Kotyaev, O.*; Kurahashi, Shinri*
no journal, ,
To decommission the Fukushima Daiichi Nuclear Power Station, it is essential to dispose radioactive wastes resulting from the disaster. The wastes cannot be diagnosed manually on account of exposure to high-dose rate. Thus development of remote diagnostic technologies for the wastes must be indispensable. The aim of the present work is to develop a method of evaluating physical and mechanical properties of heat-deteriorated concrete. Non-contact measurement of the propagation time of ultrasonic waves through the concrete was performed with an LDV. The experimental result shows that the propagation time becomes longer as a result of heat processing. The difference in propagation time depends on the changes in physical and mechanical properties of concrete suffered from heat processing. From viewpoint of remote diagnostic technologies for the decommissioning, an LDV is a promising tool to evaluate heat-deterioration of concrete by measuring ultrasonic waves propagating through a concrete.
Yamada, Tomonori; Nguyen, P. L.; Hanari, Toshihide; Shibata, Takuya; Nishimura, Akihiko; Koyama, Shinichi; Daido, Hiroyuki; Shimada, Yoshinori*; Kotyaev, O.*; Kurahashi, Shinri*
no journal, ,
For decommissioning of the Fukushima Daiichi Nuclear Power Station (NPS) of Tokyo Electric Power Company, Incorporated, it is essential to dispose radioactive wastes resulted from the accident. The wastes cannot be diagnosed and removed manually on account of exposure to high radiation dose. Thus research and development of remote techniques for wastes is indispensable. In terms of remote handling, a fiber delivered laser beam can access into the narrow gap and process the object without repulsive force. That is a powerful advantage of laser processing. We are now developing remote laser techniques for sensing and sampling at the Naraha Remote Technology Development Center.
Hasegawa, Noboru*; Nishikino, Masaharu*; Mikami, Katsuhiro*; Okada, Hajime*; Kondo, Shuji*; Kawachi, Tetsuya*; Shimada, Yoshinori*; Kurahashi, Shinri*; Kitamura, Toshiyuki*; Kotyaev, O.*; et al.
no journal, ,
no abstracts in English
Kase, Kiwamu*; Saito, Norihito*; Wada, Satoshi*; Midorikawa, Katsumi*; Shimada, Yoshinori*; Kurahashi, Shinri*; Kawachi, Tetsuya*; Nishikino, Masaharu*; Daido, Hiroyuki; Yamada, Tomonori
no journal, ,
no abstracts in English
Yamakawa, Koichiro; Shimizu, Genki*; Suzuki, Natsumi*; Nasu, Hirokazu*; Tsuboi, Rei*; Kurahashi, Hiroyuki*; Arakawa, Ichiro*
no journal, ,
no abstracts in English