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Oral presentation

Evaluation of concrete strength by laser induced ultrasonic waves

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

Oral presentation

Evaluation of concrete properties by laser induced ultrasonic waves for reactor decommissioning

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.

Oral presentation

Development of laser techniques for decommissioning of Fukushima Daiichi Nuclear Power Station

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.

Oral presentation

Development of the novel maintenance conservation method for infrastructures by using the laser technology

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

Oral presentation

R&D of laser directive noncontact diagnosis system for maintaining degraded infrastructures

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

Oral presentation

Development of an apparatus for terahertz spectroscopy in an ultrahigh vacuum; Temperature dependence of the spectrum of vapor-deposited D$$_2$$O ice

Yamakawa, Koichiro; Shimizu, Genki*; Suzuki, Natsumi*; Nasu, Hirokazu*; Tsuboi, Rei*; Kurahashi, Hiroyuki*; Arakawa, Ichiro*

no journal, , 

no abstracts in English

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