Development of environment for remote participation in fusion research on JT-60

Oshima, Takayuki; Naito, Osamu; Hamamatsu, Kiyotaka; Iba, Katsuyuki; Sato, Minoru; Sakata, Shinya; Tsugita, Tomonori; Matsuda, Toshiaki; Iwasaki, Keita*; Karube, Yukihiro*; et al.

Fusion Engineering and Design, 71(1-4), p.239 - 244, 2004/06

https://doi.org/10.1016/j.fusengdes.2004.04.040

In the JT-60 tokamak at JAERI, environment for remote participation is planned to be developed by concentrating experts of nuclear fusion research of another research organizations and universities distributed all over the country. We are constructing a hierarchical remote research system, which consists of remote experiment, remote analysis, and remote diagnostic. In a remote collaboration, it is important to maintain the security of the system, as well as to share the information, atmosphere and presence between the participants. For the latter purpose, we developed a video conferencing system, and a video streaming system that can deliver the images of the JT-60 control room. Furthermore, a development of the remote analysis system called "VizAnalysis" has been started. And to assist the remote analysis, we developed a web based software system called "VizSquare". In the JT-60 tokamak at JAERI, security and authentication methods on a computer network and a new communication tool are developed, and probably they will be applied to the remote participation of ITER.

Scientific visual analysis system required for large-scale numerical simulations

Suzuki, Yoshio; Kishimoto, Yasuaki; NEXT Group

Purazuma, Kaku Yugo Gakkai-Shi, 78(1), p.59 - 69, 2002/01

http://ci.nii.ac.jp/naid/110003827101

From the year 2000 to 2001, the computer system located on Naka Fusion Research Establishment, Japan Atomic Energy Research Institute has been replaced. Since the main computer is the scalar parallel computer, which is about 40 times superior to the previous one, the amount of data outputted from the numerical simulations becomes much larger. In this paper, which scientific visual analysis system is more useful to extract the physical phenomena from such a large amount of data is investigated and the performance of the established visual analysis system is estimated.

Computer simulation systems for analyzing optimum dismantling procedures on nuclear facilities

Tachibana, Mitsuo; ; Yanagihara, Satoshi

Proc. of 6th Int. Conf. on Radioactive Waste Management and Environmental Remediation (ICEM'97), p.831 - 834, 1997/00

no abstracts in English

Laser remote analysis for MOX fuel and its application for rapid and in-situ analysis in decommissioning of "Fukushima Daiichi" Nuclear Power Station

Wakaida, Ikuo; Akaoka, Katsuaki; Miyabe, Masabumi; Oba, Hironori; Saeki, Morihisa; Oba, Masaki; Ito, Chikara; Kato, Masaaki

no journal, , 

Laser Induced Breakdown Spectroscopy (LIBS) for elemental analysis and Laser Ablation Resonance Absorption Spectroscopy (LARAS) for isotope analysis have been developed as an analytical technique for Low-decontaminated MOX fuel with fissionable Miner Actinide elements (MA) and as for one of the diagnostic tool of nuclear fuel debris and polluted materials in the decommissioning of the severe accident nuclear power station. Specialized glove box with auto and remote arraignment system for LIBS and LARAS was constructed, and the detection limit of Pu in MOX to be several 1000 ppm and some hyper fine structures of Pu were demonstrated. For the diagnostic tool in the decommissioning of damaged core, optical fiber based portable LIBS probe made by radiation resistant optical fiber is under construction, and just now, some specific spectra from the simulated sample of molten debris made by sintered oxide of Zr and U is successfully observed under water condition or strong radiation field.

Challenging in LIBS technology for decommissioning of damaged reactor "Fukushima Daiichi Nuclear Power Station"

Wakaida, Ikuo; Oba, Hironori; Oba, Masaki; Matsumoto, Ayumu; Ruas, A.; Toshimitsu, Masaaki; Akaoka, Katsuaki; Miyabe, Masabumi

no journal, , 

For the decommissioning of "Fukushima Daiichi Nuclear Power Station", Optical Fiber based LIBS probe is constructed, and under water condition, we have successfully observed some specific spectra from the simulated sample of molten debris made by sintered oxide of Zr and U. For the use of more longer optical fiber, long-pulse laser with the pulse duration about 100 ns will be introduced to compensate the delivery power loss and/or to enhance the emission signal to be about several times by the time integration of emission signal. As for the signal enhancement technique, microwave assisted LIBS technique coupled with simple antenna for the combination use with fiber LIBS will be under developing, and about ten times enhancement was observed under the atmosphere condition. For the application to the liquid phase sample, especially for the analysis of the polluted cooling water, the thin-sheet liquid jets will be also introduced as the convenience and high sensitive monitoring for dissolved elements of nuclear fuel debris.

Laser remote analysis for in-core and in-situ monitoring of debris in decommissioning of Fukushina Daiichi Nuclear Power Station

Wakaida, Ikuo; Oba, Hironori; Akaoka, Katsuaki; Oba, Masaki; Miyabe, Masabumi; Matsumoto, Ayumu

no journal, , 

Radiation resistant optical fiber based laser induced breakdown spectroscopy (Fiber LIBS) is developed for in-core and in-situ elemental analysis of debris and its activity is performed under severe environmental conditions such as high radiation field of about 10 kGy/h and under water. Long pulse laser, microwave assisted LIBS for more high sensitivity and liquid sample application are also introduced. Long-pulse laser with the pulse duration about 100 ns will be introduced to compensate the delivery power loss and/or to enhance the emission signal. microwave assisted LIBS technique coupled with simple antenna for the combination use with fiber LIBS will be under developing, and about ten times enhancement was observed under the atmosphere condition. For the application to the liquid phase sample, especially for the analysis of the polluted cooling water, the thin-sheet liquid jets will be also introduced as the convenience and high sensitive monitoring for dissolved elements of nuclear fuel debris.

Laser remote analysis for decommissioning of Fukushima Daiichi Nuclear Power Station

Wakaida, Ikuo; Oba, Hironori; Akaoka, Katsuaki; Miyabe, Masabumi; Oba, Masaki; Taira, Takunori*

no journal, , 

Preparation for trial use of optical fiber based portable LIBS system at actual working site in decommissioning of Fukushima Daiichi Nuclear Power Station

Wakaida, Ikuo; Oba, Hironori; Nakanishi, Ryuzo; Akaoka, Katsuaki; Shibata, Takuya

no journal, , 

Laser remote analysis for decommissioning of Fukushima Daiichi Nuclear Power Station (1FNPS) and its application in the actual site

Wakaida, Ikuo; Oba, Hironori; Nakanishi, Ryuzo; Akaoka, Katsuaki; Shibata, Takuya

no journal, , 

Laser remote analysis by optical fiber coupled laser induced breakdown spectroscopy for on-site, in-situ screening of nuclear debris in decommissioning of Fukushima Daiichi Nuclear Power Station

Wakaida, Ikuo; Oba, Hironori; Akaoka, Katsuaki; Nakanishi, Ryuzo; Shibata, Takuya; Karino, Takahiro

no journal, ,