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Journal Articles

Study on Pu-burner high temperature gas-cooled reactor in Japan; Test and characterization for ZrC coating

Ueta, Shohei; Aihara, Jun; Mizuta, Naoki; Goto, Minoru; Fukaya, Yuji; Tachibana, Yukio; Okamoto, Koji*

Proceedings of 9th International Topical Meeting on High Temperature Reactor Technology (HTR 2018) (USB Flash Drive), 7 Pages, 2018/10

The security and safety fuel (3S-TRISO fuel) employs the coated fuel particle with a fuel kernel made of plutonium dioxide (PuO$$_{2}$$) and yttria stabilized zirconia (YSZ) as an inert matrix. Especially, a zirconium carbide (ZrC) coating is one of key technologies of the 3S-TRISO, which performs as an oxygen getter to reduce the fuel failure due to internal pressure during the irradiation. R&Ds on ZrC coating directly on the dummy CeO$$_{2}$$-YSZ kernel have been carried in the Japanese fiscal year 2017. As results of ZrC coating tests by the bromide chemical vapor deposition process, stoichiometric ZrC coatings with 3 - 18 microns of thicknesses were obtained with 0.1 kg of particle loading weight.

Journal Articles

Hydrogen production tests by hydrogen iodide decomposition membrane reactor equipped with silica-based ceramics membrane

Myagmarjav, O.; Tanaka, Nobuyuki; Nomura, Mikihiro*; Kubo, Shinji

International Journal of Hydrogen Energy, 42(49), p.29091 - 29100, 2017/12

 Times Cited Count:10 Percentile:50.46(Chemistry, Physical)

The catalytic decomposition of hydrogen iodide in a membrane reactor using silica membranes derived from hexyltrimethoxysilane (HTMOS) was investigated for the production of hydrogen in the thermochemical water splitting iodine-sulfur process. The silica membranes were prepared by counter-diffusion chemical vapor deposition using porous alumina support tubes in both the absence and presence of a $$gamma$$-alumina layer. The silica membranes formed on $$gamma$$-alumina-coated $$alpha$$-alumina tubes displayed a higher H$$_{2}$$ permeance than that formed directly on an $$alpha$$-alumina tube. A silica membrane based on a 1.5 $$mu$$m-thick $$gamma$$-alumina layer fabricated under deposition conditions of 450$$^{circ}$$C, 1200 s, and a N$$_{2}$$ carrier gas velocity of 0.044 m s$$^{-1}$$ exhibited a high H$$_{2}$$ permeance of 9.4 $$times$$ 10$$^{-7}$$ mol Pa$$^{-1}$$ m$$^{-2}$$ s$$^{-1}$$ while maintaining an H$$_{2}$$/N$$_{2}$$ selectivity of over 80.0. The performance of a membrane reactor based on an HTMOS-derived silica membrane was evaluated at 400$$^{circ}$$C by measuring the HI conversion and H$$_{2}$$ flow rates. The conversion was approximately 0.48 when the HI flow rate was 9.7 mL min$$^{-1}$$.

Journal Articles

SR-excited process

Teraoka, Yuden

Nano Tekunoroji Daijiten, p.340 - 351, 2003/12

The current status of microprocesses using synchrotron radiation in Japan was reviewed. The SR-excited process is followed by SR-excited surface modification, SR-excited crystal growth and SR-excited etching. The SR-excited surface modification is followed by SR-gas-excited surface modification and SR-direct-excited surface modification. The SR-excited crystal growth is followed by SR-excited atomic layer epitaxy and SR-excited chemical vapor deposition. THe SR-excited etching is followed by SR-direct-excited etching, SR-gas-excited etching and SR ablation.

Journal Articles

Stability of a silica membrane prepared by CVD using $$gamma$$- and $$alpha$$-alumina tube as the support tube in the Hi-H$$_{2}$$O gaseous mixture

Hwang, G.*; Kim, J.*; Choi, H.*; Onuki, Kaoru

Journal of Membrane Science, 215(1-2), p.293 - 302, 2003/04

 Times Cited Count:15 Percentile:42.2

no abstracts in English

JAEA Reports

Plan to development of ZrC-TRISO coated fuel particle and construction of ZrC coater

Ueta, Shohei; Tobita, Tsutomu*; Ino, Hiroichi*; Takahashi, Masashi*; Sawa, Kazuhiro

JAERI-Tech 2002-085, 41 Pages, 2002/11

JAERI-Tech-2002-085.pdf:2.66MB

no abstracts in English

Journal Articles

Separation of hydrogen from H$$_{2}$$-H$$_{2}$$O-HI gaseous mixture using a silica membrane

Hwang, G.; Onuki, Kaoru; Shimizu, Saburo

AIChE Journal, 46(1), p.92 - 98, 2000/01

 Times Cited Count:38 Percentile:19.59(Engineering, Chemical)

no abstracts in English

Journal Articles

Hydrogen separation in H$$_{2}$$-H$$_{2}$$O-HI gaseous mixture using the silica membrance prepared by chemical vapor deposition

Hwang, G.*; Onuki, Kaoru; Shimizu, Saburo; *

J. Membr. Sci., 162(1-2), p.83 - 90, 1999/00

 Times Cited Count:62 Percentile:8.99(Engineering, Chemical)

no abstracts in English

JAEA Reports

Studies on hydrogen separation membrane for IS process; Membrane preparation with porous $$alpha$$-alumina tube

Hwang, G.*; Onuki, Kaoru; Shimizu, Saburo

JAERI-Research 98-002, 8 Pages, 1998/01

JAERI-Research-98-002.pdf:0.53MB

no abstracts in English

Journal Articles

Gas permeation through CVD modified anodic alumina membrane

Onuki, Kaoru; *; Nakajima, Hayato; Shimizu, Saburo

J. Chem. Eng. Jpn., 30(2), p.359 - 362, 1997/00

 Times Cited Count:2 Percentile:68.91(Engineering, Chemical)

no abstracts in English

JAEA Reports

Thermodynamic calculations for chemical vapor deposition of silicon carbide using ehyltrichlorosilane

Nakano, Junichi; Yamada, Reiji

JAERI-Research 95-045, 26 Pages, 1995/06

JAERI-Research-95-045.pdf:1.08MB

no abstracts in English

Journal Articles

Internal flaws in the silicon carbide coating of fuel particles for high-temperature gas-cooled reactors

Minato, Kazuo; ; Fukuda, Kosaku; *; *; *; *

Nuclear Technology, 106, p.342 - 349, 1994/06

 Times Cited Count:14 Percentile:23.35(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Developing ZrC coatings for nuclear fue l particles

Ogawa, Toru; Fukuda, Kosaku

Surface Modification Technologies,III, p.309 - 320, 1990/00

no abstracts in English

Journal Articles

Chemical vapor deposition of silicon carbide for coated fuel particles

Minato, Kazuo;

Journal of Nuclear Materials, 149, p.233 - 246, 1987/00

 Times Cited Count:52 Percentile:3.28(Materials Science, Multidisciplinary)

no abstracts in English

JAEA Reports

Themodynamic Calculations for Chamical Vapor Deposition of Silicon Cable

Minato, Kazuo; ; Ikawa, Katsuichi

JAERI-M 85-043, 27 Pages, 1985/03

JAERI-M-85-043.pdf:0.9MB

no abstracts in English

Oral presentation

Preparation of metal nano-needles using ion-track membranes

Koshikawa, Hiroshi; Yamamoto, Shunya; Sugimoto, Masaki; Kitamura, Akane; Sawada, Shinichi; Yamaki, Tetsuya

no journal, , 

Chemical etching of polymer films irradiated with heavy ions leads to the formation of ion-track membranes with nanoscale pores in different shapes. Particularly, conically-shaped pores are expected to have a potential to create metallic nanoneedles by combination of vapor-deposition and electroplating methods. In this study, we prepared copper nanoneedles inside the conical pores of polyimide (PI)-based ion-track membranes and investigated their morphology. The PI films were irradiated with $$^{40}$$Ar ions. The irradiated films were etched in a sodium hypochlorite solution at 60$$^{circ}$$C for 0.5 h, leading to the formation of conical pores with a surface diameter of ca. 500 nm. A very thin Au layer was deposited on this pore side of the ion-track membranes; then, it was used as a cathode for electroplating copper into the pores. After dissolving the PI templates, we obtained the copper needles ca. 500 nm in base diameter and 1.2 $$mu$$m in height on copper plates.

Oral presentation

Development of a silica membrane for H$$_{2}$$ production from HI decomposition in the IS process

Myagmarjav, O.; Ikeda, Ayumi*; Nomura, Mikihiro*; Kubo, Shinji

no journal, , 

In this study, we have developed a highly hydrogen permeable silica membrane derived from hexyltrimethoxysilane as a Si precursor using porous alumina support. Modification of alumina support tubes in the absence of and in the presence of $$gamma$$-alumina coating was carried out by a counter diffusion chemical vapor deposition (CVD). A membrane with intermediate $$gamma$$-alumina layer showed higher H$$_{2}$$ permeance (7.7 $$times$$ 10$$^{-7}$$ mol m$$^{-2}$$ s$$^{-1}$$ Pa$$^{-1}$$) than that formed directly on the $$alpha$$-alumina tube (3.8 $$times$$ 10$$^{-8}$$ mol m$$^{-2}$$ s$$^{-1}$$ Pa$$^{-1}$$). It was found that the thickness of $$gamma$$-alumina layer played an important role in the improvement of membrane permeation performance. Modified membrane based on $$gamma$$-alumina coating with a thickness of 1.5 $$mu$$m exhibited H$$_{2}$$/SF$$_{6}$$ selectivity over 3000 at 270$$^{circ}$$C, while maintaining H$$_{2}$$ permeance in the order of 10$$^{-7}$$ mol m$$^{-2}$$ s$$^{-1}$$ Pa$$^{-1}$$. The results led to the conclusion that the modified membrane is a promising candidate for further enhancement of HI decomposition in membrane reactor.

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