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Tanigawa, Hiroyasu; Nozawa, Takashi; Ando, Masami
JAEA-Review 2009-053, 89 Pages, 2010/03
JAEA-Review-2009-053.pdf:22.39MB
R&D on DEMO engineering was started from 2007 as the main activity of a DEMO design and R&D coordination center activity which was one of the international nuclear fusion energy research center (IFERC) activity of "Broader Approach" (BA) activity. In the DEMO engineering R&D activity, five "generic" R&D items were selected, which attract both Japan and EU interest and not specific to a DEMO design, i.e., (1) R&D on SiC/SiC Composites: (2) R&D on Tritium Technology: (3) R&D on Materials Engineering for DEMO Blanket: (R&D on reduced activation ferritic/martensitic steel: RAFM) (4) R&D on Advanced Neutron Multiplier for DEMO Blanket: (5) R&D on Advanced Tritium Breeders for DEMO Blanket. In first phase (2007 -2009), some part of preliminary R&D, which was defined in procurement arrangement (PA) between Japan and EU, is conducted by JAEA university collaboration. This report summarized the results from joint research activities about R&D on SiC/SiC composite and RAFM in 2008.
Idesaki, Akira; Sugimoto, Masaki; Yoshikawa, Masahito; Tanaka, Shigeru; Narisawa, Masaki*; Okamura, Kiyohito*; Ito, Masayoshi*
Journal of Materials Science, 42(1), p.130 - 135, 2007/01
Times Cited Count：3 Percentile：14.16(Materials Science, Multidisciplinary)We have synthesized minute SiC products from polyvinylsilane (PVS), which is a liquid organosilicon polymer, with radiation curing. Since there is a close relationship between the properties of obtained SiC products and pyrolysis condition, it is important to investigate the ceramization process of PVS in order to find out the optimum pyrolysis condition. In this paper, the ceramization process of the PVS cured by 
-ray irradiation at room temperature was investigated by gas analysis, thermogravimetric analysis, density measurement, and so on. It was found that the ceramization of -ray cured PVS starts above 500K, and that drastic organic-inorganic conversion occurs in the temperature range of 700-1100K. According to the results of the changes of mass and density, it was found that the volume shrinkage of PVS during the curing and pyrolysis processes is 80%. The SiC obtained by pyrolysis at 1573K showed the density of 2.50g/cm
and microvickers hardness of 31.6GPa.
Idesaki, Akira; Sugimoto, Masaki; Tanaka, Shigeru; Narisawa, Masaki*; Okamura, Kiyohito*; Ito, Masayoshi*
Journal of Materials Science, 39(18), p.5689 - 5694, 2004/09
Times Cited Count：7 Percentile：30.86(Materials Science, Multidisciplinary)Irradiation effect of -ray on polyvinylsilane (PVS), which is a liquid organosilicon polymer, was investigated and the optimum curing condition to synthesize a minute SiC product with radiation curing was discussed. Room temperature and liquid nitrogen temperature (77K) were examined as the irradiation temperature. In both cases, the cured PVS maintaining its formed shape could be obtained by -ray irradiation under vacuum, and the cured PVS in solid state at room temperature was obtained by irradiation with dose of above 3-4MGy. It was found that the efficiency of crosslinking in case of the irradiation at room temperature is higher than that in case of irradiation at 77K. The PVS injected into a mold was irradiated by -ray with dose of 3.6MGy at room temperature under vacuum, and pyrolyzed at 1273 K in Ar gas atmosphere. As a result, minute SiC products which had similar shapes to the mold and the sizes of 30-60
m were obtained.
Katayama, Atsushi; Sato, Seichi*; Jitsukawa, Shiro*
no journal, ,
Resulting in a decrease in the Great East Japan Earthquake, as a result of the severe accident Fukushima Daiichi Nuclear Power Plant (Fukushima Daiichi NPP), radioactive material was released from the furnace. Iwaki City, Fukushima with the National College of Technology, victims from the adjacent region coexist. Under these circumstances, people and the building and construction related to the practice in decontamination, etc., educators involved with the sensitive parent problem of exposure is, every day while beset with doubts and anxiety in a variety of ways in the information about the radiation has been spent. Intended for people like that, Fukushima National College of Technology, has organized and cooperation, a lecture on radiation safety and radiation with the help of nuclear power mechanism too much this year. I will report details and results of the activities here.
