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Nakamichi, Masaru; Kim, Jae-Hwan; Yonehara, Kazuo
Fusion Engineering and Design, 88(6-8), p.611 - 615, 2013/10
Times Cited Count：35 Percentile：92.80(Nuclear Science & Technology)Advanced neutron multipliers with lower swelling and higher stability at high temperature are desired in pebble-bed blankets, which would have a big impact on the design of a DEMO reactor, especially on the blanket operating temperature. Development of advanced neutron multipliers has been started by Japan and EU in the DEMO R&D as a part of the Broader Approach (BA) activities. Beryllium intermetallic compounds (beryllides) such as Be
Ti are one of the most promising advanced neutron multipliers. In order to fabricate the beryllide pebbles, beryllide with shapes of block and/or rod is necessary when a melting granulation process is applied such as a rotating electrode method. However, beryllide is too brittle for the fabrication of blocks or rods by these methods. A plasma sintering method has been proposed as new technique which uses a non conventional consolidation process, because this method is simple, and is easy to control. It was clarified that the beryllide could be simultaneously synthesized and jointed by the plasma sintering method in the insert material region between two beryllide blocks, with no variation of the phase and hardness. Beryllide rod of BeTi with 10 mm in diameter and 60 mm in length has been successfully fabricated by the plasma sintering method. Using this plasma-sintered beryllide rod, prototype pebble of beryllide was performed by a rotating electrode method. The prototype pebbles of BeTi with 1 mm in average diameter were successfully fabricated. The present paper describes novel granulation process of beryllide using these methods including fabrication and granulation techniques.
Nakamichi, Masaru; Kim, Jae-Hwan; Wakai, Daisuke; Yonehara, Kazuo
Fusion Engineering and Design, 87(5-6), p.896 - 899, 2012/08
Times Cited Count：8 Percentile：52.08(Nuclear Science & Technology)Nakamichi, Masaru; Yonehara, Kazuo; Wakai, Daisuke
Fusion Engineering and Design, 86(9-11), p.2262 - 2264, 2011/10
Times Cited Count：24 Percentile：85.45(Nuclear Science & Technology)Nakamichi, Masaru; Yonehara, Kazuo
Journal of Nuclear Materials, 417(1-3), p.765 - 768, 2011/10
Times Cited Count：43 Percentile：94.34(Materials Science, Multidisciplinary)Nakamichi, Masaru; Yonehara, Kazuo; Nishitani, Takeo
Proceedings of 9th IEA International Workshop on Beryllium Technology (BeWS-9), p.16 - 20, 2009/09
Nakamichi, Masaru; Shibayama, Tamaki*; Tatenuma, Katsuyoshi*; Yonehara, Kazuo
Proceedings of 9th IEA International Workshop on Beryllium Technology (BeWS-9), p.40 - 43, 2009/09
Nakamichi, Masaru; Yonehara, Kazuo
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Nakamichi, Masaru; Yonehara, Kazuo
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Nakamichi, Masaru; Kim, Jae-Hwan; Wakai, Daisuke; Yonehara, Kazuo
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Nakamichi, Masaru; Yonehara, Kazuo; Kim, Jae-Hwan
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Kim, Jae-Hwan; Wakai, Daisuke; Yonehara, Kazuo; Nakamichi, Masaru
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Kim, Jae-Hwan; Yonehara, Kazuo; Wakai, Daisuke; Nakamichi, Masaru
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Nakamichi, Masaru; Kim, Jae-Hwan; Yonehara, Kazuo; Wakai, Daisuke
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Kim, Jae-Hwan; Yonehara, Kazuo; Wakai, Daisuke; Nakamichi, Masaru
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Oikawa, Fumiaki; Kim, Jae-Hwan; Yonehara, Kazuo; Wakai, Daisuke; Nakamichi, Masaru
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Nakamichi, Masaru; Kim, Jae-Hwan; Yonehara, Kazuo; Wakai, Daisuke
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Kim, Jae-Hwan; Yonehara, Kazuo; Wakai, Daisuke; Nakamichi, Masaru
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Segawa, Tomoomi; Kawaguchi, Koichi; Ishii, Katsunori; Nishina, Masahiro; Makino, Takayoshi; Natori, Yuri*; Ikemoto, Norihiro*; Yonehara, Kazuo*; Tatenuma, Katsuyoshi*
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Japan Atomic Energy Agency has researched and developed a simplified MOX pellet fabrication process. the flowability of MOX powder is improved by a tumbling granulation method using water as a binder. However, in this granulation method, improvement of the production capacity under criticality control for wet nuclear material is an issue. In recent years, an additive-free dry granulation technology has proposed as a novel granulation method for producing tritium breeding Li
O spheres for nuclear fusion reactor. In this study, to confirm the applicability of this method to the MOX fuel fabrication process, CeO powder was used as a simulated material of MOX powder as a basic test for mechanization, and the influence of mechanical external force on granulation was confirmed and evaluated. As a result of the test, good granulation property was obtained by applying a mechanical external force of vertical vibration, and it was possible to obtain the prospect of mechanization of the dry granulation process.
Nakamichi, Masaru; Yonehara, Kazuo
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raysYamazaki, Takumi; Takada, Chie; Nakamura, Keisuke; Sagawa, Naoki; Hoshi, Katsuya; Nakagawa, Takahiro; Takimoto, Misaki; Tanimura, Yoshihiko*; Takahashi, Fumiaki; Momose, Takumaro; et al.
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