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Hasegawa, Kenta; Goto, Ichiro*; Miyazaki, Yasunori; Ambai, Hiromu; Watanabe, So; Watanabe, Masayuki; Sano, Yuichi; Takeuchi, Masayuki
Proceedings of 30th International Conference on Nuclear Engineering (ICONE30) (Internet), 5 Pages, 2023/05
Ishii, Katsunori; Segawa, Tomoomi; Kawaguchi, Koichi; Suzuki, Masahiro
Proceedings of 2019 International Congress on Advances in Nuclear Power Plants (ICAPP 2019) (Internet), 5 Pages, 2019/05
Japan Atomic Energy Agency (JAEA) is developing a simplified pelletizing process for MOX fuel fabrication. In this process, the flowability of MOX powder produced by de-nitration conversion based on microwave heating, calcination, and reduction is improved using the wet granulation method. In a previous paper, to produce MOX granules of appropriate sizes for pelletizing them effectively, we proposed a granulation system composed of a wet granulator and a sizing machine. In the present work, we modernized the wet granulator, completed the granulation system by adding auxiliary equipment, and conducted performance tests of the granulation system with WO
powder. The results of a performance test indicated that it is possible to convert raw powder into granules characterized by appropriate size and excellent flowability. The time required to process 5 kg of WO powder was about 70 min, which almost satisfies the target time.
-doped LiTiOTsuchiya, Kunihiko; Kawamura, Hiroshi
Fusion Technology, 39(2-Part2), p.624 - 627, 2001/03
no abstracts in English
TiO pebblesTsuchiya, Kunihiko; Kawamura, Hiroshi
Journal of Nuclear Materials, 283-287(Part.2), p.1380 - 1384, 2000/12
Times Cited Count：53 Percentile：93.51(Materials Science, Multidisciplinary)no abstracts in English
Mizoguchi, Kenichi*; Yamaguchi, Isoo; Morita, Yasuji; Yamagishi, Isao; ; Kubota, Masumitsu
JAERI-Research 98-026, 29 Pages, 1998/05
JAERI-Research-98-026.pdf:1.45MB
no abstracts in English
TiO pebbles with automatic dropping systemTsuchiya, Kunihiko; Kawamura, Hiroshi; ; ;
Fusion Technology 1998, 2, p.1293 - 1296, 1998/00
no abstracts in English
O pebbles by wet processTsuchiya, Kunihiko; Saito, Shigeru; Kawamura, Hiroshi; ; ;
Journal of Nuclear Materials, 253, p.196 - 202, 1998/00
Times Cited Count：11 Percentile：65.56(Materials Science, Multidisciplinary)no abstracts in English
TiO pebbles by wet processTsuchiya, Kunihiko; Kawamura, Hiroshi; ; ;
Journal of Nuclear Materials, 258-263, p.1985 - 1990, 1998/00
Times Cited Count：69 Percentile：97.20(Materials Science, Multidisciplinary)no abstracts in English
Tokuoka, Naochika*; Kobayashi, Mamoru*; Koyama, Takashi*
PNC TJ1636 96-001, 64 Pages, 1996/03
None
O pebbles fabricated by the melting granulation method; Kawamura, Hiroshi; Nakamichi, Masaru; Imaizumi, Hideki*; Saito, Minoru; ; Nagakura, Masaaki*
Journal of Nuclear Materials, 219, p.240 - 245, 1995/00
Times Cited Count：15 Percentile：77.38(Materials Science, Multidisciplinary)no abstracts in English
佐野 雄一; 渡部 創; 宮崎 康典; 安倍 弘; 長谷川 健太
後藤 一郎*
JP, 2022-032647 Patent licensing information
【課題】粒子径が従来よりも大きく、粒子径の均一性が比較的高い粒子を製造することができる粒子製造方法を提供する。 【解決手段】本発明に係る粒子製造方法は、組成物を、振動するノズルから、撹拌機により撹拌された溶媒中に滴下し、組成物が含まれる粒子を造粒する造粒工程(ステップS1)と、前記造粒工程(ステップS1)で得られた溶媒を含む粒子から、溶媒を除去し、粒子を得る溶媒除去工程(ステップS2)と、を含むことを特徴とする。
Ishii, Katsunori; Segawa, Tomoomi; Kawaguchi, Koichi; Suzuki, Masahiro
no journal, ,
To develop flowability improvement technology for the simplified pelletizing process, a simple granulator with little powder adhesion, was experimentally produced. To know the performance of the granulator, granulation experiments was conducted by using dummy powder.
granules produced using wet granulatorIshii, Katsunori; Segawa, Tomoomi; Kawaguchi, Koichi
no journal, ,
The Japan Atomic Energy Agency is developing a simplified mixed oxide (MOX) fuel fabrication process. In this process, a wet granulator improves the flowability of MOX raw powder for the pelletizing process 1, 2). Following this granulation step, the formed granules have moisture content of approximately 10 wt.%. To adhere to the acceptance standards regarding moisture content for the fuel pellet fabrication step, drying the granules under the moisture content of 1 wt.% using a dryer is necessary. To maintain the granule shape during powder handling and shaker process of a pressing machine, the granules must be adjusted to enough crushing strength. However, the relation between dry conditions and granule crushing strength has not been reported. Therefore, to estimate the appropriate heating conditions of the dryer, we investigated the influence of varying heating conditions on moisture content and granule crushing strength.
Segawa, Tomoomi; Kawaguchi, Koichi; Ishii, Katsunori; Nishina, Masahiro; Makino, Takayoshi; Natori, Yuri*; Ikemoto, Norihiro*; Yonehara, Kazuo*; Tatenuma, Katsuyoshi*
no journal, ,
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 LiO 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.
Akashi, Masatoshi; Nishina, Masahiro; Morimoto, Kyoichi; Kato, Yoshiyuki; Kato, Masato
no journal, ,
A die filling experiment was carried out using granulated MOX powder to investigate the condition of MOX granules suitable for constant die filling. It was found that the mean particle diameter and the Hausner ratio gave an indication of the die filling for the granulated MOX powder.
Nakamichi, Masaru; Kim, Jae-Hwan
no journal, ,
no abstracts in English
Ishii, Katsunori; Kawaguchi, Koichi; Segawa, Tomoomi; Suzuki, Masahiro
no journal, ,
JAEA is developing the simplified pelletizing process as advanced MOX fuel fabrication technology in the future. The standardizer could eliminate coarse particles from granules produced by wet granulator without degradation of flowability.
Takato, Kiyoto; Nishina, Masahiro; Tsuchimochi, Ryota; Hayashizaki, Kohei; Segawa, Tomoomi; Kawaguchi, Koichi; Ishii, Katsunori; Makino, Takayoshi; Okumura, Kazuyuki
no journal, ,
no abstracts in English
