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Journal Articles

Chapter 5 CO$$_{2}$$ separation and recovery technology; 3 Possibility of carbon dioxide separation using silica-based membranes and carbon dioxide reusing by membrane reactors

Nomura, Mikihiro*; Ishii, Katsunori; Sato, Yuya*

Recent Trends in Methanation and Green Hydrogen, p.148 - 157, 2023/10

no abstracts in English

Journal Articles

Validation of evaluation model for analysis of steam reformer in HTGR hydrogen production plant

Ishii, Katsunori; Aoki, Takeshi; Isaka, Kazuyoshi; Noguchi, Hiroki; Shimizu, Atsushi; Sato, Hiroyuki

Proceedings of 30th International Conference on Nuclear Engineering (ICONE30) (Internet), 9 Pages, 2023/05

Journal Articles

Development plan for coupling technology between high temperature gas-cooled reactor HTTR and hydrogen production facility, 1; Overview of the HTTR heat application test plan to establish high safety coupling technology

Nomoto, Yasunobu; Mizuta, Naoki; Morita, Keisuke; Aoki, Takeshi; Okita, Shoichiro; Ishii, Katsunori; Kurahayashi, Kaoru; Yasuda, Takanori; Tanaka, Masato; Isaka, Kazuyoshi; et al.

Proceedings of 30th International Conference on Nuclear Engineering (ICONE30) (Internet), 7 Pages, 2023/05

Journal Articles

Development plan for coupling technology between high temperature gas-cooled reactor HTTR and Hydrogen Production Facility, 2; Development plan for coupling equipment between HTTR and Hydrogen Production Facility

Mizuta, Naoki; Morita, Keisuke; Aoki, Takeshi; Okita, Shoichiro; Ishii, Katsunori; Kurahayashi, Kaoru; Yasuda, Takanori; Tanaka, Masato; Isaka, Kazuyoshi; Noguchi, Hiroki; et al.

Proceedings of 30th International Conference on Nuclear Engineering (ICONE30) (Internet), 6 Pages, 2023/05

Journal Articles

Preventing nuclear fuel material adhesion on glove box components using nanoparticle coating

Segawa, Tomoomi; Kawaguchi, Koichi; Ishii, Katsunori; Suzuki, Masahiro; Tachihara, Joji; Takato, Kiyoto; Okita, Takatoshi; Satone, Hiroshi*; Suzuki, Michitaka*

Mechanical Engineering Journal (Internet), 8(3), p.21-00022_1 - 21-00022_9, 2021/06

To reduce the hold-up of the nuclear fuel materials in the glove box and the external exposure dose, the technology of the MOX powder adhesion prevention by the nanoparticle coating to the acrylic panels of the glove box has been developed. The surface analysis by means of atomic force microscopy (AFM) showed that the acrylic test piece surface coated with nanoparticles had a higher root mean square roughness value than that non-coated with nanoparticles. Due to the formation of nano-sized tiny rugged surface, the nanoparticle coating reduced the minimum adhesion force between the UO$$_{2}$$ particles and the acrylic test piece surface with the smallest particle size of about 5 $$mu$$m where desorption was observed, by about one-tenth. Moreover, the nanoparticle coating reduced the amount of the MOX powder adhering to the acrylic test piece to about one-tenth. In this study, it was found that applying the nanoparticle coating to the acrylic panels of glove box can prevent the adhesion of nuclear fuel materials. This method is effective for reducing the hold-up of the nuclear fuel materials in the glove box, the external exposure dose and improving the visibility of the acrylic panels.

Journal Articles

Preventing nuclear fuel material adhesion on glove box components using nanoparticle coating

Segawa, Tomoomi; Kawaguchi, Koichi; Ishii, Katsunori; Suzuki, Masahiro; Tachihara, Joji; Takato, Kiyoto; Okita, Takatoshi; Satone, Hiroshi*; Suzuki, Michitaka*

Proceedings of 2020 International Conference on Nuclear Engineering (ICONE 2020) (Internet), 6 Pages, 2020/08

To reduce the hold-up of the nuclear fuel materials in the glove box and the external exposure dose, the technology of the MOX powder adhesion prevention by the nanoparticle coating to the acrylic panels of the glove box has been developed. Due to the formation of nano-sized tiny rugged surface, the nanoparticle coating reduced the minimum adhesion force between the UO$$_{2}$$ particles and the acrylic test piece surface with the smallest particle size of about 5 $$mu$$m where desorption was observed, by about one-tenth. Moreover, the nanoparticle coating reduced the amount of the MOX powder adhering to the acrylic test piece to about one-tenth. In this study, it was found that applying the nanoparticle coating to the acrylic panels of glove box can prevent the adhesion of nuclear fuel materials. This method is effective for reducing the hold-up of the nuclear fuel materials in the glove box, the external exposure dose and improving the visibility of the acrylic panels.

Journal Articles

Technological development of the particle size adjustment of dry recovered powder

Segawa, Tomoomi; 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 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

Verification of the quantitative method to measure enrichment of uranium-235 in radioactive waste

Yokoyama, Kaoru; Sato, Katsunori*; Yamanaka, Takashi*; Ishimori, Yuu

Radioisotopes, 65(11), p.441 - 450, 2016/11

It is important for the processing manufacturers of the uranium fuels to determine the quantity of U-235 and the enrichment. This study shows that the U-235 content evaluated from measurement of 186 keV $$gamma$$ rays emitted from U-235 can be corrected by a shielding factor, Xgeometry which quantified uneven distribution of U-238. The Xgeometry is evaluated from the direct and the scattered $$gamma$$ rays from the 1001 keV emitted from the Pa-234m. The Xgeometry was originally introduced for U-238 measurements. Because U-235 coexists with U-238, the Xgeometry is also possible to apply to the U-235 measurements. The experimental study with simulated waste drums demonstrated that the quantification errors of the U-235 content and the enrichment are reduced considering the factor.

Journal Articles

Prevention of powder adhesion on substrate using nanoparticle coating

Suzuki, Michitaka*; Yoshikawa, Mao*; Iimura, Kenji*; Satone, Hiroshi*; Ishii, Katsunori

Funtai Kogakkai-Shi, 50(6), p.405 - 409, 2013/06

The glass substrate is coated by the silica nanoparticle suspension using dipping or spin coat method and dried in an electric oven. The glass substrate surface is covered with nanoparticle thin layer and the transparent and tiny rugged surface can be produced on a substrate. It was experimentally confirmed to prevent dust adhesion by covering the surface of the glass substrate with nanoparticle. The adhesion force between particle and substrate is measured by the centrifugal method and the relation between the adhesion force and the surface roughness is discussed from experimental and theoretical point of view. The measured and calculated results by Van der Waals force show that adhesion force decreased with the increment of the surface roughness. From the results, nanoparticle coating is very effective to prevent the dust adhesion on the substrate and the various application of nanoparticle coating can be expected.

Journal Articles

Test results of the SMES model coil; Stability

*; Hanai, S.*; Wachi, Y.*; *; *; Hamajima, Takataro*; *; Koizumi, Norikiyo; Ando, Toshinari; Tsuji, Hiroshi; et al.

Teion Kogaku, 33(7), p.485 - 491, 1998/00

no abstracts in English

Oral presentation

Measuring of capping phenomena in powder compaction process using X-ray computed tomography

Suzuki, Michitaka*; Tanaka, Yutaka*; Iimura, Kenji*; Satone, Hiroshi*; Ishii, Katsunori

no journal, , 

The capping phenomenon is one of the important causes of the powder molding trouble. The research of the capping such as how to occur and what kind of condition related to the phenomena is not cleared still now. The packing particles for our tests were 20-150um spherical Alumina granules and the sieved narrow sized granules were also used. The compression tests were performed by a material-tester. The capping region could be detected from X-ray computed tomographic images and the depth of capping area was measured. It's clear that the capping phenomena are easy to occur at small compression displacement in the case of wider size distributed granules 20-150um. It comes from the higher adhesion force between fine powder and the piston or the mold surface. The depth of capping is decreasing with the increase in displacement. In the conclusion, the capping phenomena can be prevented to use coarser mono-sized granules for compression molding.

Oral presentation

Evaluation of the effect on the prevention of uranium dioxide powder adhesion on substrate using nanoparticle coating

Segawa, Tomoomi; Kawaguchi, Koichi; Ishii, Katsunori; Suzuki, Masahiro; Satone, Hiroshi*; Suzuki, Michitaka*

no journal, , 

To reduce the hold-up of the nuclear material in the glove box and the external exposure dose, the development of the technology of the powder adhesion prevention by the nanoparticle coating to the glove box component has been proceed. The adhesion between the uranium dioxide particles and the substrates of the acrylic, stainless steel and hypalon rubber, which was coated with nanoparticles using a silica nanoparticle-containing hydrophobic modifier was measured and evaluated. In the case of an acrylic substrate, it was found that the application of the coating significantly reduces the lower limit of the particle-substrate adhesion to about one tenth, and the adhesion preventing effect of the uranium dioxide powder can be obtained. This method is considered to be effective for the reduction of the hold-up of the nuclear material in the glove box and the external exposure dose.

Oral presentation

Development of the prevention technique for the powder adhesion on substrate by the micro-fabrication and nanoparticle coating

Segawa, Tomoomi; Kawaguchi, Koichi; Ishii, Katsunori; Tokura, Ryoma*; Satone, Hiroshi*; Suzuki, Michitaka*

no journal, , 

To reduce the hold-up of the nuclear material in the glove box and the external exposure dose, the development of the technology of the powder adhesion prevention by the micro-fabrication and nanoparticle coating to the glove box component has been proceed. The prevention effect of powder adhesion and adhesion force of micro-fabricated stainless steel and acrylic, polycarbonate and stainless steel coated with nanoparticle were evaluated. The atomic force microscope was used for measuring the adhesion force between the unmodified and micro-fabricated stainless steel surface and the colloidal probe. In the case of unmodified, the adhesion force was about 2.03 nN, whereas when the micro-fabricated, the adhesive force was reduced to about 1.16 nN. This method is considered to be effective for the reduction of the hold-up of the nuclear material in the glove box and the external exposure dose.

Oral presentation

Study on nanoparticle coating method and evaluation of the effect on the prevention of powder adhesion

Omi, Koyo; Segawa, Tomoomi; Kawaguchi, Koichi; Ishii, Katsunori; Tokura, Ryoma*; Satone, Hiroshi*; Suzuki, Michitaka*

no journal, , 

To reduce the retention of the nuclear fuel materials in the glove box and the external exposure dose, the technology of the powder adhesion prevention by the nanoparticle coating to the glove box components has been developed. In this study, it was measured and evaluated that the prevention of powder adhesion by using acrylic, polycarbonate and stainless steel test pieces of the glove box components, with the nanoparticle coating method and the concentration of nanoparticles as parameters. Painting, spraying and dipping were examined as the coating method, and the spraying method with the proper workability was selected. Furthermore, since the coverage ratio of the alumina powder on the untreated surface of each test piece is 20% or more, whereas the coverage was reduced to 5% or less on the coating surface, it was found that the high powder adhesion preventing effect can be obtained by the nanoparticle coating.

Oral presentation

Evaluation of the effects of granulated alumina powder characteristics and die wall lubricant on compaction behavior using X-ray computed tomography

Segawa, Tomoomi; Kawaguchi, Koichi; Ishii, Katsunori; Nishina, Masahiro; Makino, Takayoshi; Iimura, Kenji*; Satone, Hiroshi*; Suzuki, Michitaka*; Natori, Yuri*

no journal, , 

Japan Atomic Energy Agency has developed a simplified pelletizing fuel fabrication system. In this system, the flowability of a MOX raw powder is improved by wet granulation for the pelletizing process, and the die wall lubrication method directly presses the granulated MOX powder into green pellets without adding any lubricant into the powder. The homogeneous compression is important to fabricate high-density green pellets. However, it is difficult to observe the compaction behavior in situ. Therefore, the capping phenomenon was investigated by using X-ray computed tomography and alumina powder that is highly transparent against X-rays. When lubricant was used, the breakage of the particles extended to the bottom compared with not used. This result indicates that the die wall lubrication is effective for the homogeneous compression of granulated powders.

Oral presentation

Study on powder adhesion prevention by surface micro-fabrication of stainless steel

Hayashizaki, Kohei; Omi, Koyo; Segawa, Tomoomi; Kawaguchi, Koichi; Ishii, Katsunori; Satone, Hiroshi*; Suzuki, Michitaka*

no journal, , 

To reduce the retention of the nuclear fuel materials in the glove box and the external exposure dose, the technology of the powder adhesion prevention by the surface micro-fabrication on the glove box components has been developed. In this study, a stainless steel specimen, which is a glovebox component material, was subjected to surface microfabrication, and measurements and evaluations were carried out concerning adhesion and powder adhesion prevention effects. A stainless steel specimen that was unmachined and several specimens with different surface roughnesses that had been micro-fabricated on their surfaces were used to perform surface roughness and adhesion measurement tests by atomic force microscopy. The average adhesion force tended to decrease as the surface roughness increased. In this study, it was found that surface micro-fabrication of stainless steel had a certain effect on preventing powder adhesion.

Oral presentation

Current status of HTGR hydrogen production technology development; Overview of HTTR heat application test project plan

Morita, Keisuke; Shimizu, Atsushi; Noguchi, Hiroki; Aoki, Takeshi; Okita, Shoichiro; Mizuta, Naoki; Ishii, Katsunori; Iigaki, Kazuhiko; Sato, Hiroyuki; Sakaba, Nariaki

no journal, , 

no abstracts in English

Oral presentation

Development of large-scale hydrogen production technology utelizing very high temperature, 1-3; Test plan for developing coupling technology between HTTR and hydrogen production facility

Nomoto, Yasunobu; Mizuta, Naoki; Morita, Keisuke; Aoki, Takeshi; Okita, Shoichiro; Ishii, Katsunori; Kurahayashi, Kaoru; Yasuda, Takanori; Tanaka, Masato; Isaka, Kazuyoshi; et al.

no journal, , 

no abstracts in English

Oral presentation

Development of large-scale hydrogen production technology utilizing very high temperature, 2-2; Designs of secondary helium cooling equipment for HTTR-Heat Application Test Facility

Ishii, Katsunori; Mizuta, Naoki; Morita, Keisuke; Aoki, Takeshi; Kurahayashi, Kaoru; Yasuda, Takanori; Noguchi, Hiroki; Nomoto, Yasunobu; Shimizu, Atsushi; Iigaki, Kazuhiko; et al.

no journal, , 

no abstracts in English

19 (Records 1-19 displayed on this page)
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