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Journal Articles

The Evaluation of the properties of the collision-plate-type jet mill for dry recycling of MOX powder

Kawaguchi, Koichi; Segawa, Tomomi; Yamamoto, Kazuya; Makino, Takayoshi; Iso, Hidetoshi; Ishii, Katsunori

Funtai Kogakkai-Shi, 57(9), p.478 - 484, 2020/09

A collision plate type jet mill is assumed to be a pulverizer that can control the particle size for nuclear fuel fabrication. The collision plate type jet mill consists of two modules, a classifier and a mill chamber. Coarse component of powder is cycled in the equipment and finally pulverized into objective particle size. In this report, simulated crushed powders were classified and pulverized step by step, and particle size distribution were compared. The collision plate type jet mil can produce objective size particles with low overgrinding.

Journal Articles

Technological development of the particle size adjustment of dry recovered powder

Segawa, Tomomi; Yamamoto, Kazuya; Makino, Takayoshi; Iso, Hidetoshi; Kawaguchi, Koichi; Ishii, Katsunori; Sato, Hisato; Fukasawa, Tomonori*; Fukui, Kunihiro*

Proceedings of International Nuclear Fuel Cycle Conference / Light Water Reactor Fuel Performance Conference (Global/Top Fuel 2019) (USB Flash Drive), p.738 - 745, 2019/09

In the MOX fuel fabrication process, the dry grinding technology of mixed oxide pellets have been developed for the effective use of nuclear fuel materials. To develop a technology to control the particle size of dry recovered powder, the performance of the buhrstone mill and the collision plate type jet mill were studied using a simulated powder of particle size distribution about 500 $$mu$$m. We found that the particle size can be controlled at the range of about 250 $$mu$$m or less by both by adjusting the clearance between the grinding wheels of the buhrstone mill, and the clearance and elevation angle of the clarification zone of the the collision plate type jet mill. And furthermore, the collision plate type jet mill is considered to be suitable for particle size control because the operating parameters of the classifier can be finely adjusted.

Journal Articles

Temperature dependence of electric conductivities in femtosecond laser modified areas in silicon carbide

Deki, Manato*; Oka, Tomoki*; Takayoshi, Shodai*; Naoi, Yoshiki*; Makino, Takahiro; Oshima, Takeshi; Tomita, Takuro*

Materials Science Forum, 778-780, p.661 - 664, 2014/02

 Times Cited Count:2 Percentile:19.86

no abstracts in English

Journal Articles

Feasibilyty study on a simplified MOX pellet fabrication process, the short process, for fast breeder reactor fuel

Asakura, Koichi; Takeuchi, Kentaro; Makino, Takayoshi; Kato, Yoshiyuki

Nuclear Technology, 167(3), p.348 - 361, 2009/09

 Times Cited Count:4 Percentile:66.42(Nuclear Science & Technology)

Technological feasibility of a simplified MOX pellet fabrication process, the short process, was studied. About 300 g MH-MOX powder with adjusted plutonium content to 30% could be successfully processed by a tumbling-granulator for subsequent pelletizing and sintering processes. The granulated 30%PuO$$_{2}$$-MOX powder could be pressed into green annular pellets directly and smoothly when using a die wall lubrication method. The pellet tensile strengths were compared for a granulated molybdenum powder and they were higher for pellets obtained when using the die wall lubrication method than when using the conventional powder mixing method. The amount of additives in the green pellets could be controlled at 0.06wt% in this process. It is therefore, possible to carry out de-waxing and sintering of green pellets in the same furnace. By controlling the average particle sizes of granulated 30%PuO$$_{2}$$-MOX powders, pellets with more than 95% theoretical density could be obtained after 1700 $$^{circ}$$C for 2 h. As a result, it can be concluded that the short process is technoligically feasible to fabricate MOX annular pellets.

Journal Articles

Development of the simplified MOX pellet fabrication process (short process); Improvement of MOX powder lowability

Makino, Takayoshi; Okita, Takatoshi; Kato, Yoshiyuki; Kurita, Tsutomu; Takahashi, Yoshiharu; Aono, Shigenori

Proceedings of International Conference on Nuclear Energy System for Future Generation and Global Sustainability (GLOBAL 2005) (CD-ROM), 5 Pages, 2005/10

A simplified MOX pellet fabrication process, called short process, has been developed to drastically reduce fuel fabrication cost.The MH powder has characteristic of fine particle and low flowability. It is difficult to pelletize the MH powder directly without granulation into smaller size FR pellet compared with LWR fuel. Therefore, small-scale hot tests to improve the flowability of the MH powder has been carried out using two kinds of methods, and quality of the pellet was evaluated.

Oral presentation

Results of basic examinations on the simplified MOX fuel fabrication process (short process), 3; Pellet fabrication tests

Makino, Takayoshi; Okita, Takatoshi; Kato, Akebumi*; Suzuki, Yuichiro*; Minakawa, Susumu; Kashimura, Motoaki

no journal, , 

no abstracts in English

Oral presentation

Improvement of fluidity of the powder for nuclear fuel, 3

Kurita, Tsutomu; Kato, Yoshiyuki; Mukai, Yasunobu; Makino, Takayoshi; Kimura, Yuichi*; Nemoto, Ryo*

no journal, , 

no abstracts in English

Oral presentation

Development of simplified pellet fuel production technology, 2; Processing technology for de-nitration conversion based on microwave heating

Kato, Yoshiyuki; Kimura, Yuichi; Isomae, Hidemi; Kurita, Tsutomu; Yoshimoto, Katsunobu; Makino, Takayoshi; Suzuki, Masahiro; Kihara, Yoshiyuki

no journal, , 

no abstracts in English

Oral presentation

Development of simplified pellet fuel production technology, 5; Die wall lubrication pellet technology

Sudo, Katsuo; Makino, Takayoshi; Kato, Akebumi*; Okita, Takatoshi; Suzuki, Masahiro; Kashimura, Motoaki; Kihara, Yoshiyuki; Haga, Tetsuya

no journal, , 

no abstracts in English

Oral presentation

Technological development of the particle size adjustment of recycle powder, 3; Optimization study of collision plate-type jet mill

Segawa, Tomomi; Yamamoto, Kazuya; Makino, Takayoshi; Iso, Hidetoshi; Sato, Hisato

no journal, , 

The optimizing the centrifugal classifier which influences the classification performance of collision plate-type jet mill was examined for the purpose of the particle size adjustment of recycle powder the MOX pellets. In order to adjust the particle size of recycle powder to 10-250 $$mu$$m, the pulverization test of the simulated raw powder was carried out using the newly prepared components as a parameter. The prospect that the particle size can be adjusted within the range of 10-250 $$mu$$m for recycle powder was obtained by optimizing the parameter of the centrifugal classifier of collision plate-type jet mill.

Oral presentation

Technological development of the particle size adjustment of recycle powder, 2; Selection and evaluation of pulverizers

Yamamoto, Kazuya; Makino, Takayoshi; Iso, Hidetoshi; Sato, Hisato

no journal, , 

no abstracts in English

Oral presentation

Pulverization characteristics of a collision plate type jet mill for particle size adjustment of recovered powder in the MOX fuel fabrication process

Kawaguchi, Koichi; Segawa, Tomomi; Yamamoto, Kazuya; Makino, Takayoshi; Iso, Hidetoshi; Ishii, Katsunori

no journal, , 

The reworking of out of specification pellets is required for the effective use of nuclear fuel material and for reduction of the plutonium inventory in fuel fabrication facilities. It is known that the sintering density of mixed oxide pellets can be controlled without a pore-former by controlling the amount and particle size of the recovered powder in the raw powder. The collision plate type jet mill was separated into the classifier and the mill chamber, and these modules were used independently. The peak position shifted to smaller sizes gradually over the five cycles of classification and pulverization. The collision plate type jet mill is a promising form of equipment to obtain particles with objective sizes as the main component of a powder.

Oral presentation

Improvement of fireproof performance by sealing the fire-retardant sheet on glove box panels, 2; Influence of usage conditions on glove box panels

Shinada, Kenta; Kawasaki, Kohei; Makino, Takayoshi; Okamoto, Naritoshi

no journal, , 

no abstracts in English

Oral presentation

Improvement of fireproof performance by sealing the fire-retardant sheet on glove box panels, 1; Influence of burning on glove box panels

Kawasaki, Kohei; Shinada, Kenta; Makino, Takayoshi; Okamoto, Naritoshi

no journal, , 

no abstracts in English

Oral presentation

Technological development of the particle size adjustment of recycle powder, 4; Pulverization characteristics of collision plate-type jet mill

Makino, Takayoshi; Yamamoto, Kazuya; Segawa, Tomomi; Kawaguchi, Koichi; Iso, Hidetoshi

no journal, , 

The purpose of this study is to develop technology of the particle size adjustment of dry recovered powder of MOX pellets. Pulverization and classification experiments were conducted using simulated pellets obtained from materials having similar hardness and different density (specific gravity). We report that the results of pulverization and classification experiments in which experimental parameters were the clearance of the centrifugal classifier affecting the classification performance of the collision plate type jet mill.

Oral presentation

The Evaluation of the properties of the collision-plate-type jet mill for dry recycling of MOX powder

Kawaguchi, Koichi; Segawa, Tomomi; Yamamoto, Kazuya; Makino, Takayoshi; Iso, Hidetoshi; Ishii, Katsunori

no journal, , 

Collision plate type jet mill is a promissing pluverizer which can adjust particle size of a recycling powder in dry recycling of MOX fuel scrap pellet in a fuel manufacturing process for fast reactors. The equipment consists of a classifier chamber and a pluverizer chamber, and particle size of collected powder can be adjusted by controling the operational parameter of the classifier. The examination focused on the pluverizer was performed, and it was confirmed that coarse component is pluverized without overgrinding.

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

Research on the improvement of particle size adjustment technology of dry recovered powder and the sintered density control

Segawa, Tomomi; Kawaguchi, Koichi; Ishii, Katsunori; Yamamoto, Kazuya; Makino, Takayoshi; Iso, Hidetoshi; Fukasawa, Tomonori*; Fukui, Kunihiro*

no journal, , 

Japan Atomic Energy Agency has been used out of specification mixed oxide (MOX) pellets as a dry recovered powder for the effective use of nuclear fuel material in the MOX fuel fabrication process. The densities of the sintered MOX pellets can be controlled to about 85 %T.D. without adding pore former by adjusting the amount and the particle size of the dry recovered powder into the raw powder. It is required to adjust the particle size of the dry recovered powder to under 250 $$mu$$m, the influence of the operating parameters of the collision plate-type jet mill on the characteristics of pulverization and the influence of pulverized powders on sintering properties were evaluated. The clearance was narrowed, the pulverized powders were confirmed to be adjusted for the particle diameter of under 250 $$mu$$m, and the pellet prepared from the pulverized powder with density of about 85.0 %T.D. was obtained.

Oral presentation

Technological development of the particle size adjustment of recycle powder, 5; Evaluation of the particle size adjusted powder on the sintered pellet characteristics

Yamamoto, Kazuya; Segawa, Tomomi; Makino, Takayoshi; Kawaguchi, Koichi; Iso, Hidetoshi; Ishii, Katsunori

no journal, , 

no abstracts in English

Oral presentation

Image analysis on ceramography of MOX fuel pellets by machine learning

Hiroka, Shun; Okumura, Kazuyuki; Makino, Takayoshi

no journal, , 

no abstracts in English

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)