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Naoe, Takashi; Teshigawara, Makoto; Futakawa, Masatoshi; Mizutani, Haruki; Muramatsu, Toshiharu; Yamada, Tomonori; Ushitsuka, Yuji*; Tanaka, Nobuatsu*; Yamasaki, Kazuhiko*
Proceedings of 8th International Congress on Laser Advanced Materials Processing (LAMP 2019) (Internet), 5 Pages, 2019/05
Laser cutting is one of the options in the disposal of radio-active waste, such as spallation neutron target vessel in J-PARC, etc. Due to unique characteristic of laser, such as non-contact system, it is more easily to provide remote-controlled system in comparison with conventional one, such as mechanical cutting machine, etc. However, a demerit of laser cutting is the sputter and fume caused by laser cutting, resulting in contamination with radio-active materials its surroundings. Recently it was developed that the spatter suppression technique by controlling laser beam profile in laser welding process. In order to apply this suppression technique to laser cutting, first of all, we attempted to observe the phenomenon at melting area during laser cutting using a high-speed video camera in order to make the physical model. The result showed that the appearance of fume and sputter were independently confirmed in the time evolution.
Usami, Tsutomu; Moriyama, Kiyofumi; Nishikizawa, Tomotoshi; Nakamura, Hideo
JAERI-Tech 2005-028, 37 Pages, 2005/05
JAERI-Tech-2005-028.pdf:16.32MB
The steam explosion during a severe accident in a light water reactor, which may occur by the contact of molten core and coolant, has been known as a potential threat on the integrity of the containment vessel, and has been studied in the nuclear safety research field. Prediction of the intensity of steam explosions needs an understanding of the initial premixture. However, visual observation of the premixture in experiments is usually difficult due to the vapor generation. Thus, we investigated the possibility of a high-speed X-ray visualization with a 4500 f/s high speed video camera with an image-intensifier and three kinds of scintillator materials: CdWO
, ZnS(Ag) and CsI(Tl). A modeled premixture consisted of metal objects and bubbles in a water vessel was used. The test result showed that the CsI(Tl) scintillator gave the best image quality among the three and the high-speed visualization at 4500 f/s was possible, though in the still picture which carried out one of the recorded picture, the picture became indistinct.
Kureta, Masatoshi
Kashika Joho Gakkai-Shi, 23(89), p.21 - 26, 2003/04
no abstracts in English
Matsubayashi, Masahito
Hihakai Kensa No Saizensen (CD-ROM), 7 Pages, 2002/00
no abstracts in English
Mishima, Kaichiro*; Hibiki, Takashi*; Fujine, Shigenori*; Yoneda, Kenji*; Tsuruno, Akira; Matsubayashi, Masahito; Sobajima, Makoto
Nihon Kikai Gakkai Rombunshu, B, 61(591), p.161 - 168, 1995/11
no abstracts in English
Matsubayashi, Masahito
Hamon, 4(3), p.14 - 24, 1994/10
no abstracts in English
Oba, Hironori; Araki, Masanori; Shibata, Takemasa
Japanese Journal of Applied Physics, 33(5A), p.L693 - L695, 1994/00
Times Cited Count：2 Percentile：17.87(Physics, Applied)no abstracts in English
Morobishi, Ryota*; Somaki, Takahiro*; Fukasawa, Tsuyoshi*; Miyagawa, Takayuki*; Yamamoto, Tomohiko; Okamura, Shigeki*
no journal, ,
no abstracts in English
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 Station. 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.
