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Journal Articles

Development of granulation system for simplified MOX pellet fabrication process

Ishii, Katsunori; Segawa, Tomomi; 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$$_{3}$$ 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$$_{3}$$ powder was about 70 min, which almost satisfies the target time.

Journal Articles

Characterization of TiO$$_{2}$$-doped Li$$_{2}$$TiO$$_{3}$$

Tsuchiya, Kunihiko; Kawamura, Hiroshi

Fusion Technology, 39(2-Part2), p.624 - 627, 2001/03

no abstracts in English

Journal Articles

Development of wet process with substitution reaction for the mass production of Li$$_{2}$$TiO$$_{3}$$ pebbles

Tsuchiya, Kunihiko; Kawamura, Hiroshi

Journal of Nuclear Materials, 283-287(Part.2), p.1380 - 1384, 2000/12

 Times Cited Count:50 Percentile:5.6(Materials Science, Multidisciplinary)

no abstracts in English

JAEA Reports

Development of partitioning method: Adsorption behaivor of Sr on titanic acid pelletized with binder

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

Journal Articles

Mass fabrication development of Li$$_{2}$$TiO$$_{3}$$ pebbles with automatic dropping system

Tsuchiya, Kunihiko; Kawamura, Hiroshi; *; *; *

Fusion Technology 1998, 2, p.1293 - 1296, 1998/00

no abstracts in English

Journal Articles

Fabrication development of Li$$_{2}$$O pebbles by wet process

Tsuchiya, Kunihiko; Saito, Shigeru; Kawamura, Hiroshi; *; *; *

Journal of Nuclear Materials, 253, p.196 - 202, 1998/00

 Times Cited Count:8 Percentile:41.09(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Fabrication development and preliminary characterization of Li$$_{2}$$TiO$$_{3}$$ pebbles by wet process

Tsuchiya, Kunihiko; Kawamura, Hiroshi; *; *; *

Journal of Nuclear Materials, 258-263, p.1985 - 1990, 1998/00

 Times Cited Count:58 Percentile:3.14(Materials Science, Multidisciplinary)

no abstracts in English

JAEA Reports

None

; ; ; ;

PNC-TN8410 96-214, 36 Pages, 1996/07

PNC-TN8410-96-214.pdf:1.44MB

None

JAEA Reports

Analysis of metallic salt granulation preocess, II

Tokuoka, Naochika*; Kobayashi, Mamoru*; Koyama, Takashi*

PNC-TJ1636 96-001, 64 Pages, 1996/03

PNC-TJ1636-96-001.pdf:14.63MB

None

JAEA Reports

None

PNC-TJ1636 95-001, 42 Pages, 1995/03

PNC-TJ1636-95-001.pdf:3.28MB

no abstracts in English

Journal Articles

Characteristics of Li$$_{2}$$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:14 Percentile:20.83(Materials Science, Multidisciplinary)

no abstracts in English

Oral presentation

Granulation of porous silica particle for extraction chromatography technology

Watanabe, So; Sano, Yuichi; Kofuji, Hirohide; Takeuchi, Masayuki

no journal, , 

no abstracts in English

Oral presentation

Basic research programs for the next generation vitrification technology, 19; Vitrification properties of MA adsorbents

Kofuji, Hirohide; Watanabe, So; Goto, Ichiro; Oriuchi, Akio; Takeuchi, Masayuki; Nagai, Takayuki; Sasage, Kenichi

no journal, , 

no abstracts in English

Oral presentation

Unconfined compression strength of tamlbing granular by DEM simulation

Akashi, Masatoshi; Kato, Masato; Tamura, Tetsuya*

no journal, , 

no abstracts in English

Oral presentation

Study on the condition of MOX granules suitable for constant die filling in MOX fuel pellet production

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.

Oral presentation

Development of flowability improvement technology for MOX powder by wet granulation; Performance evaluation of granulator

Ishii, Katsunori; Segawa, Tomomi; 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.

Oral presentation

Development of flowability improvement technology for MOX powder by wet granulation; Experiments on size distribution control of granulated powder

Ishii, Katsunori; Kawaguchi, Koichi; Segawa, Tomomi; 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.

Oral presentation

Drying experiments of CeO$$_{2}$$ granules produced using wet granulator

Ishii, Katsunori; Segawa, Tomomi; 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.

Oral presentation

Study on development of additive-free dry granulation technology and evaluation of granulation characteristics

Ishii, Katsunori; Segawa, Tomomi; Kawaguchi, Koichi; Nishina, Masahiro; Makino, Takayoshi; Natori, Yuri*

no journal, , 

JAEA is developing simplified a plutonium and uranium mixed oxide (MOX) pellet fabrication process. In this process, agitation granulator improves flowability of MOX powder with water as binder. This granulation method has issues, including low production capacity due to criticality control for wet nuclear material. A new simple additive-free dry granulation method was proposed recently to produce tritium breeding Li$$_{2}$$O spheres for nuclear fusion reactor. In this research, results of experiments to investigate the applicability of the new granulation method to MOX powder is reported.

Oral presentation

Granulation characteristics confirmation test of additive-free dry granulation technology for fast reactor fuel fabrication

Segawa, Tomomi; 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 Li$$_{2}$$O spheres for nuclear fusion reactor. In this study, to confirm the applicability of this method to the MOX fuel fabrication process, CeO$$_{2}$$ 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.

21 (Records 1-20 displayed on this page)