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Kuwahara, Akira; Asami, Daichi*; Nishimoto, Koji*; Nankawa, Takuya; Matsui, Makoto*
no journal, ,
no abstracts in English
Gwon, H.; Tanigawa, Hisashi; Hirose, Takanori; Kawamura, Yoshinori
no journal, ,
Design/Manufacturing of Test Blanket Module (TBM), TBM test for demonstration of major functions of blanket are one of the most important subjects which are closely related with Design/Manufacturing of blanket in prototype reactor. In addition to that it is necessary to investigate the design which can cover load condition of prototype reactor. Unfortunately, however, the examination concerning the load condition of prototype reactor was still insufficient. In present study, we focused on pressure rise in blanket box as well as increase of decay heat under In Box LOCA. The characteristics of thermal structural response of blanket was investigated. Based on the results we proposed the design which can handle the conditions of prototype reactor.
Mo/
Tc generatorSuzuki, Yoshitaka; Ishida, Takuya; Suzuki, Yumi*; Matsukura, Minoru*; Kurosaki, Fumio*; Nishikata, Kaori; Mimura, Hitoshi*; Tsuchiya, Kunihiko
no journal, ,
no abstracts in English
Nakano, Hiroko; Shibata, Hiroshi; Takeuchi, Tomoaki; Matsui, Yoshinori; Tsuchiya, Kunihiko
no journal, ,
no abstracts in English
Yomogida, Takumi; Esaka, Fumitaka; Magara, Masaaki
no journal, ,
In this study, we developed a micro-Raman spectroscopy technique combined with alpha track-detection to identify chemical forms of uranium particles. U
O
and UO
particles were used as samples. Films containing uranium-bearing particles were exposed to alpha track detectors (TNF-1) for a few months. The location of uranium particles in the films were identified by observing alpha tracks which caused by spontaneous fission of uranium. The characteristic Raman bands which derive from UO and UO structures were observed in the Raman spectra of uranium particles.
Kanda, Naoyuki; Aoyama, Yoshio
no journal, ,
no abstracts in English
Yamamoto, Keisuke; Aoyama, Yoshio
no journal, ,
no abstracts in English
Tada, Kohei; Kitawaki, Shinichi; Watanabe, So; Hinai, Hiroshi; Shibata, Atsuhiro; Nomura, Kazunori
no journal, ,
no abstracts in English
Ono, Masato; Iigaki, Kazuhiko; Shimazaki, Yosuke; Tochio, Daisuke; Shimizu, Atsushi; Takada, Shoji; Sawa, Kazuhiro
no journal, ,
The HTTR is graphite-moderated and helium gas-cooled reactor with prismatic fuel elements and hexagonal blocks. Here, the graphite block is brittle materials and might be damaged by collision of neighboring blocks by the large earthquake. On March 11th, 2011, off the Pacific coast of Tohoku Earthquake of magnitude 9.0 occurred. After the accident at the Fukushima Daiichi Nuclear Power Station, the safety of nuclear reactors is the highest importance. To confirm the seismic integrity of HTTR core components, the seismic analysis was carried out. In parallel, confirmation tests cold state and integrity confirmation of reactor buildings and component support structures were also carried out. As a result, the integrity of the HTTR facilities was confirmed.
Tsuchiko, Yasuhiro*; Suto, Yudai*; Hoshi, Katsuya
no journal, ,
no abstracts in English
Hoshi, Katsuya; Nishino, Sho; Yoshida, Tadayoshi; Tsuchiko, Yasuhiro*; Suto, Yudai*
no journal, ,
no abstracts in English
Omori, Kazuki; Morimoto, Kenji; Isozaki, Naohiko
no journal, ,
no abstracts in English
Sato, Junya; Sakakibara, Tetsuro; Meguro, Yoshihiro; Nakazawa, Osamu
no journal, ,
no abstracts in English
Shimazaki, Yosuke; Sawahata, Hiroaki; Yanagida, Yoshinori; Shinohara, Masanori; Kawamoto, Taiki; Takada, Shoji
no journal, ,
In High Temperature Engineering Test Reactor (HTTR), three neutron holders containing 
Cf with 3.7 GBq for each are loaded in the graphite blocks and inserted into the reactor core as a neutron startup source (NS) which is changed at the interval of approximately 7 years. These neutron holders containing the neutron sources are transported from the dealer's hot cell to HTTR using the transportation container. The holders loading to the graphite block are carried out in the fuel handling machine maintenance pit of HTTR. Technical issues were recognized for the transportation container in the past two exchange works for the safety handling work of NS holder. On the other hand, it was required that an overhaul of the conventional transportation container or development of a new transportation container because the conventional transportation container was manufactured about twenty years ago. Therefore, the development of a new transportation container for NSs, which can solve these technical issues with low cost, was carried out. Radiation exposure dose of workers was reduced. As the result, it was confirmed that the NS handling work was improved by new transportation container.
Morooka, Satoshi; Gong, W.; Harjo, S.; Aizawa, Kazuya
no journal, ,
Recently, magnesium alloys containing a Mg-Zn-Y long-period stacking ordered (LPSO) phase structure have been reported to exhibit excellent mechanical properties, including high strength and reasonable ductility. It is very important to determine the differences in plastic deformation behaviors, mechanical properties by existing of LPSO phase structure and their origin of deformation mechanism induced by the crystal structures. In this study, the reversible cyclic hardening behavior of LPSO-type magnesium alloys is investigated using 
TOF neutron diffraction during dynamic tension-compression cyclic loading conditions at constant 
0.5 % strain amplitude. The peak stresses in both tension and compression were observed to increase gradually up to the 200th cycle. At the 200th tension-compression cycle, tension and compression peak stresses are approximately +97.4 and -176.7 MPa, respectively. The peak stress for the compression was observed to be larger than that for the tension, suggesting that kinking accompanying with hardening was occurred by compression deformation. The evidence of reversible deformation behavior was obtained from the change in individual (
) integrated intensity during real-time tension-compression cyclic testing.
Matsubara, Natsumi; Nagaoka, Mika; Fujita, Hiroki; Nakano, Masanao
no journal, ,
no abstracts in English
Asozu, Takuhiro; Matsuda, Makoto; Nakamura, Masahiko; Osa, Akihiko; Ishizaki, Nobuhiro; Tayama, Hidekazu; Nakanoya, Takamitsu; Kabumoto, Hiroshi; Kutsukake, Kenichi; Otokawa, Yoshinori
no journal, ,
no abstracts in English
Sekine, Yurina
no journal, ,
Nanometer-sized particulate hydrogels, which have characteristic properties of both hydrogels and nanoparticles are attracting growing interest particularly for use as drug delivery carriers and adsorbents. Although the nanoscopic internal structures of the nanoparticles is highly related to their physical and chemical functions, no clear information has been obtained so far due to the complex structure with the multi components. Neutron scattering is a powerful tool to study multicomponent structures with nanometer resolution. In this presentation, I will discuss the results of the structural analysis of the hydrogel nanoparticles by using the neutron scattering method and applications of the particles.
C monitoring in gaseous radioactive waste in reprocessing plant and RI using facilitiesUeno, Yumi; Nakagawa, Masahiro; Sato, Junya; Iwai, Yasunori
no journal, ,
no abstracts in English