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CsUchiyama, Yusuke*; Tokunaga, Natsuki*; Azuma, Kohei*; Kamidaira, Yuki; Tsumune, Daisuke*; Iwasaki, Toshiki*; Yamada, Masatoshi*; Tateda, Yutaka*; Ishimaru, Takashi*; Ito, Yukari*; et al.
Science of the Total Environment, 816, p.151573_1 - 151573_13, 2022/04
Times Cited Count：7 Percentile：68.71(Environmental Sciences)no abstracts in English
Yamaoka, Shingo; Shimizu, Yuka*; Fukuda, Yoshihiro*; Shobu, Takahisa; Konishi, Hiroyuki
JAEA-Technology 2014-027, 21 Pages, 2014/08
JAEA-Technology-2014-027.pdf:28.95MB
At SPring-8 synchrotron radiation beamlines, it is essential to maintain a vacuum between the radiation source and the experimental station. This is achieved by using scroll pumps and turbo molecular pumps. However, scroll pump malfunctions have been reported at BL22XU. Since many of the pumps are located inside radiation-shielding hutches, malfunctions often go un-noticed. As a result, operations can continue despite the malfunction. To facilitate the early detection of scroll pump malfunctions, we have developed a "scroll pump operating status monitoring system (SCP-MS)". The system simultaneously measures motor current and vacuum pressure at the scroll pump. It is possible to monitor pumps from outside of the shielding hutch, something which was not possible until now. The (SCP-MS) has been installed to monitor scroll pumps in actual operation, to monitor the change of the motor current value and vacuum pressure. We report on the detail of the system.
revealed by the absence of an anomaly in 
-polarized phonon dispersionKajimoto, Ryoichi; Sagayama, Hajime*; Sasai, Kenzo*; Fukuda, Tatsuo; Tsutsui, Satoshi*; Arima, Takahisa*; Hirota, Kazuma*; Mitsui, Yukari*; Yoshizawa, Hideki*; Baron, A. Q. R.*; et al.
Physical Review Letters, 102(24), p.247602_1 - 247602_4, 2009/06
Times Cited Count：12 Percentile：59(Physics, Multidisciplinary)Suzudo, Tomoaki; Fukuda, Yuka*; Kaburaki, Hideo; Itakura, Mitsuhiro; Kinoshita, Motoyasu*
no journal, ,
We have developed a mesoscopic model for the microstructural change of high burn-up fuels. In the current model, the accumulation of lattice defects, such as dislocations, is expressed by a small rotation of the matrix fragment, and it is examined if the grain sub-division be reproduced as the burn-up increases.
/CeOSuzudo, Tomoaki; Kaburaki, Hideo; Itakura, Mitsuhiro; Fukuda, Yuka*; Kinoshita, Motoyasu
no journal, ,
In the peripheral region of the high-burnup fuel pellets, many bubbles with the size of about 1 micron appear and the original grains become sub-divided. This is called rim-structure formation and cause the degradation of the material. We thus are modeling this micro-structure change using e.g. a Monte-Carlo method. In the presentation, to verify the model the numerical results are compared not only with UO rim-structured data but also with the data given by the simulation experiment in which Ce0 was irradiated by the Xe-ion beam from accelerator.
Kajimoto, Ryoichi; Sagayama, Hajime*; Sasai, Kenzo*; Fukuda, Tatsuo; Tsutsui, Satoshi*; Arima, Takahisa*; Hirota, Kazuma*; Mitsui, Yukari*; Yoshizawa, Hideki*; Baron, A. Q. R.*; et al.
no journal, ,
