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

https://doi.org/10.1080/00223131.2021.2005702

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

http://www.jspf.or.jp/Journal/PDF_JSPF/jspf2013_07/jspf2013_07-500.pdf

no abstracts in English

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.

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

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.

Structure of MO-BO (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

https://doi.org/10.1016/S0022-3697(99)00143-2

no abstracts in English

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

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.

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

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.