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Journal Articles

A Design study on a metal fuel fast reactor core for high efficiency minor actinide transmutation by loading silicon carbide composite material

Ohgama, Kazuya; Hara, Toshiharu*; Ota, Hirokazu*; Naganuma, Masayuki; Oki, Shigeo; Iizuka, Masatoshi*

Journal of Nuclear Science and Technology, 59(6), p.735 - 747, 2022/06

 Times Cited Count:0 Percentile:0.02(Nuclear Science & Technology)

Journal Articles

Revising the 4${it f}$ symmetry in CeCu$$_{2}$$Ge$$_{2}$$; Soft X-ray absorption and hard X-ray photoemission spectroscopy

Aratani, Hidekazu*; Nakatani, Yasuhiro*; Fujiwara, Hidenori*; Kawada, Moeki*; Kanai, Yuina*; Yamagami, Kohei*; Fujioka, Shuhei*; Hamamoto, Satoru*; Kuga, Kentaro*; Kiss, Takayuki*; et al.

Physical Review B, 98(12), p.121113_1 - 121113_6, 2018/09

AA2018-0352.pdf:1.16MB

 Times Cited Count:3 Percentile:20.66(Materials Science, Multidisciplinary)

Journal Articles

Numerical simulation of laser processing

Yamada, Tomonori; Yamashita, Susumu; Sugihara, Kenta; Muramatsu, Toshiharu

Purazuma, Kaku Yugo Gakkai-Shi, 89(7), p.500 - 506, 2013/08

no abstracts in English

Journal Articles

Numerical simulation of thermohydraulic characteristics of dross ejection process in laser steel cutting

Sugihara, Kenta; Nakamura, Yasuyuki; Ogawa, Takemitsu; Muramatsu, Toshiharu

Proceedings of 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference (ICONE-20 & POWER 2012) (DVD-ROM), 7 Pages, 2012/07

Numerical simulation code, based on multi-phase thermohydraulics, has been being developed with a goal of a control and prediction for the laser cutting process. A thermohydraulic numerical simulation of the laser steel cutting was carried out to confirm an assist gas and sweep velocity effect to the cutting performance. The performance was evaluated, based on temperature profile and cutting front formation. Simulation results were as follows. If there was no effect of dross ejection by assist gas, a laser light was absorbed into molten steel stagnated in the kerf. Therefore, there was less laser heat input to a solid surface directly. Then, heat transport to the back side of steel plate got delayed. In the case of faster sweep velocity, delay of heat conduction and failure cut were confirmed at behind the cut starting position of the steel plate. Failure cut at the position was observed in our experiments. From these results, it was concluded that the thermohydraulics in the kerf takes important role for not only dross ejection but also promotion of heat input at solid surface.

Journal Articles

Suppression of high-cycle thermal fatigue at a mixing tee with a 90-degree bend upstream by changing its geometry

Yuki, Kazuhisa*; Ohara, Hiroshi*; Hashizume, Hidetoshi*; Tanaka, Masaaki; Muramatsu, Toshiharu; Toda, Saburo*

Proceedings of 7th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, Operation and Safety (NUTHOS-7) (CD-ROM), 21 Pages, 2008/10

Velocity measurement by PIV (Particle Image Velocimetry) and measurement of fluid-temperature are conducted in a mixing tee with an elbow on the upstream side of the tee. Parameters in the experiment are the distance between the elbow pipe exit and the tee and the curvature radius of the elbow pipe. By the experiment, certain suppression techniques for high cycle thermal fatigue in the mixing tee area are proposed to control the distance between the elbow and the tee according to the curvature radius of the elbow.

Journal Articles

Observation of CSR spectrum from JAEA-ERL

Takahashi, Toshiharu*; Minehara, Eisuke; Hajima, Ryoichi; Nishimori, Nobuyuki; Sawamura, Masaru; Nagai, Ryoji; Kikuzawa, Nobuhiro; Iijima, Hokuto; Nishitani, Tomohiro; Okuda, Shuichi*

Proceedings of 3rd Annual Meeting of Particle Accelerator Society of Japan and 31st Linear Accelerator Meeting in Japan (CD-ROM), p.523 - 525, 2006/00

no abstracts in English

Journal Articles

Observation of coherent synchrotron radiation from the JAERI energy recovery linac

Takahashi, Toshiharu*; Minehara, Eisuke; Hajima, Ryoichi; Sawamura, Masaru; Nagai, Ryoji; Kikuzawa, Nobuhiro; Iijima, Hokuto; Nishitani, Tomohiro; Okuda, Shuichi*

Proceedings of 2nd Annual Meeting of Particle Accelerator Society of Japan and 30th Linear Accelerator Meeting in Japan, p.498 - 500, 2005/07

no abstracts in English

Journal Articles

Generation of coherent synchrotron radiation from JAERI-ERL

Hajima, Ryoichi; Minehara, Eisuke; Sawamura, Masaru; Nagai, Ryoji; Kikuzawa, Nobuhiro; Iijima, Hokuto; Nishitani, Tomohiro; Takahashi, Toshiharu*; Okuda, Shuichi*

Proceedings of 27th International Free Electron Laser Conference (FEL 2005) (CD-ROM), p.301 - 304, 2005/00

no abstracts in English

JAEA Reports

Development of the carbon fiber reinforced carbon-carbon composite for High Temperature Gas-cooled Reactors

Sogabe, Toshiaki; Ishihara, Masahiro; Baba, Shinichi; Kojima, Takao; Tachibana, Yukio; Iyoku, Tatsuo; Hoshiya, Taiji; Hiraoka, Toshiharu*; Yamaji, Masatoshi*

JAERI-Research 2002-026, 22 Pages, 2002/11

JAERI-Research-2002-026.pdf:2.41MB

Carbon Fiber Reinforced Carbon-carbon Composites, C/C composites, have been developed and extensively studied their characteristics. C/C composites are considered to be promising materials for the application of a control rod in the next high performance high temperature gas-cooled reactors. In the present paper, details of the development of the candidate C/C composite are described. In the course of the development of the material, especially, feasibility of the production, stableness of the supply and cost are much taken into consideration. As the physical properties of the material, high mechanical strength such as tensile and bending, high fracture strain and fracture toughness and low dimensional change by neutron irradiation have to be met. The developed 2D-C/C composite consists of plain-weave PAN-based carbon fiber cloth and pitch derived matrix. Also, high purification up to the level of nuclear grade was successfully attained in the composite.

Journal Articles

Structural studies of K$$_{2}$$O-B$$_{2}$$O$$_{3}$$ melts and glasses

Umesaki, Norimasa*; Kita, Y.*; Iida, T.*; Handa, K.*; Kohara, Shinji*; Suzuya, Kentaro; Fukunaga, Toshiharu*; Misawa, Masakatsu*

Physics and Chemistry of Glasses, 41(5), p.304 - 308, 2000/10

no abstracts in English

Journal Articles

Structure of M$$_{2}$$O-B$$_{2}$$O$$_{3}$$ (M: Na and K) glasses and melts by neutron diffraction

Handa, K.*; Kita, Y.*; Kohara, Shinji*; Suzuya, Kentaro; Fukunaga, Toshiharu*; Misawa, Masakatsu*; Iida, T.*; *; Umesaki, Norimasa*

Journal of Physics and Chemistry of Solids, 60(8-9), p.1465 - 1471, 1999/00

 Times Cited Count:14 Percentile:61.77(Chemistry, Multidisciplinary)

no abstracts in English

JAEA Reports

Installation and execution of criticality and radiation shielding analysis codes on engineering work station

Masukawa, Fumihiro; ; Inoue, Osamu*; Hara, Toshiharu*

JAERI-M 93-024, 31 Pages, 1993/02

JAERI-M-93-024.pdf:0.84MB

no abstracts in English

Oral presentation

Generation of coherent radiation at JAEA Energy Recovery Linac

Hajima, Ryoichi; Takahashi, Toshiharu*; Nagai, Ryoji; Sawamura, Masaru; Kikuzawa, Nobuhiro; Nishimori, Nobuyuki; Iijima, Hokuto; Nishitani, Tomohiro; Okuda, Shuichi*; Minehara, Eisuke

no journal, , 

no abstracts in English

Oral presentation

Surface and internal distribution of residual stress and strain in steels by fiber laser irradiation minuteness precious metals powder welding

Shobu, Takahisa; Okazawa, Kazuhiro; Muramatsu, Toshiharu; Takase, Kazuyuki; Tsukimori, Kazuyuki; Minehara, Eisuke

no journal, , 

no abstracts in English

Oral presentation

Internal distribution of residual stresses in fiber laser welded materials using a minute metal powder

Shobu, Takahisa; Okazawa, Kazuhiro; Muramatsu, Toshiharu; Takase, Kazuyuki; Tsukimori, Kazuyuki; Minehara, Eisuke*

no journal, , 

At the commercial use stage in sodium-cooled fast breeder reactors, a securing maintenance and repair more than the equal to that of present water-cooled reactors is requested. We are aiming at the standardization of fiber laser welding technology using minuteness metal powder that three-dimensional micro-fabrication is possible as the repair technology. In the present study, the internal distribution of residual stresses in materials by the welding technology is evaluated methodologically. Now, the specimens welded under various laser conditions were made for the S50C (steel with 0.50% carbon). The surface residual stress of the specimens is measured by using laboratory X-rays. On the other hand, the measurement of internal distribution of residual stress will be carried out by using high energy synchrotron radiation X-rays in the SPring-8 facility.

Oral presentation

Creep deformation behavior of highly corrosion resistant ODS ferritic steels

Toda, Yoshiaki*; Hara, Toru*; Abe, Fujio*; Kimura, Akihiko*; Kasada, Ryuta*; Inoue, Masaki; Okuda, Takanari*; Onuki, Somei*; Ukai, Shigeharu*; Fujisawa, Toshiharu*

no journal, , 

no abstracts in English

Oral presentation

Study on applicability of laser cutting technologies for the nuclear facility, 2; Evaluation of the assist gas flow characteristics in laser cutting processes

Ogawa, Takemitsu; Sugihara, Kenta; Nakamura, Yasuyuki; Muramatsu, Toshiharu; Shamoto, Hideyasu*

no journal, , 

no abstracts in English

Oral presentation

Evaluation of transient phenomena in molten pool during laser welding

Yamada, Tomonori; Shobu, Takahisa; Yamashita, Susumu; Ogawa, Takemitsu; Sugihara, Kenta; Nishimura, Akihiko; Muramatsu, Toshiharu

no journal, , 

no abstracts in English

Oral presentation

Numerical simulation of laser cutting for thick steel plate

Sugihara, Kenta; Ogawa, Takemitsu; Nakamura, Yasuyuki; Muramatsu, Toshiharu

no journal, , 

A thermohydraulic numerical simulation of the laser steel cutting was carried out to confirm an assist gas and sweep velocity effect to the cutting performance. The performance was evaluated, based on temperature profile and cutting front formation. Simulation results were as follows. If there was no effect of dross ejection by assist gas, a laser light was absorbed into molten steel stagnated in the kerf. Therefore, there was less laser heat input to a solid surface directly. Then, heat transport to the back side of steel plate got delayed. In the case of faster sweep velocity, delay of heat conduction and failure cut were confirmed at behind the cut starting position of the steel plate. Failure cut at the position was observed in our experiments. From these results, it was concluded that the thermohydraulics in the kerf takes important role for not only dross ejection but also promotion of heat input at solid surface.

Oral presentation

Study on standardization of laser welding technologies, 8; Evaluation of transient phenomena in molten pool during laser welding

Yamada, Tomonori; Yamashita, Susumu; Sugihara, Kenta; Ogawa, Takemitsu; Shobu, Takahisa; Muramatsu, Toshiharu

no journal, , 

no abstracts in English

35 (Records 1-20 displayed on this page)