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Kai, Takeshi; Yokoya, Akinari; Ukai, Masatoshi; Fujii, Kentaro; Watanabe, Ritsuko
International Journal of Radiation Biology, 92(11), p.654 - 659, 2016/11
Times Cited Count：11 Percentile：68.70(Biology)Tachibana, Mitsuo; Kishimoto, Katsumi; Shiraishi, Kunio
International Nuclear Safety Journal (Internet), 3(4), p.16 - 24, 2014/11
Three research reactors were permanently shut down in the Nuclear Science Research Institute (NSRI) of the Japan Atomic Energy Agency (JAEA) as of October 2014. Safe storage or one-piece removal method was applied to decommissioning of these research reactors depending on decommissioning cost and utilization of facilities and so on. Various kinds of data and experiences were obtained through decommissioning of these research reactors. This report shows data and experiences on the research reactors decommissioning in the NSRI of the JAEA.
Isayama, Akihiko; Oyama, Naoyuki; Urano, Hajime; JT-60 Team
Proceedings of 21st IEEE/NPSS Symposium on Fusion Engineering (SOFE 2005) (CD-ROM), 4 Pages, 2006/00
no abstracts in English
Honjo, Eijiro; Tamada, Taro; Maeda, Yoshitake*; Koshiba, Takumi*; Matsukura, Yasuko*; Okamoto, Tomoyuki*; Ishibashi, Matsujiro*; Tokunaga, Masao*; Kuroki, Ryota
Acta Crystallographica Section F, 61(8), p.788 - 790, 2005/08
Times Cited Count：7 Percentile：54.84(Biochemical Research Methods)Granulocyte colony-stimulating factor (GCSF) receptor receives signals for regulating the proliferation and differentiation of the precursor cells of granulocytes. The complex composed of two GCSFs and two GCSF receptors was crystallized. The crystal of the complex was grown in 1.0 M sodium formate and 0.1 M sodium acetate (pH4.6). It belongs to the space group 
4
22 (or its enantiomorph 4
22) with unit cell dimensions of 
= 
= 110.1 
, 
= 331.8 . However, the diffraction data from the crystal beyond 5 resolution could not be collected. Since the heterogeneity of GCSF receptor seems to interrupt growth of good quality crystals, the GCSF receptor was fractionated by achromatography. Crystals of GCSF/fractionated GCSF receptor complex were grown as a new crystal form in 0.2 M ammonium phosphate. The new crystal diffracts beyond 3.0 resolution and belongs to space group 321 (or its enantiomorph 3
21) with unit-cell parameters = = 134.8, = 105.7 .
Sato, Masayasu; Isayama, Akihiko; Inagaki, Shigeru*; Nagayama, Yoshio*; Kawahata, Kazuo*; Iwama, Naofumi*
Europhysics Conference Abstracts (CD-ROM), 29C, 4 Pages, 2005/00
no abstracts in English
Watanabe, Norio
Nihon Genshiryoku Gakkai Wabun Rombunshi, 3(4), p.396 - 406, 2004/12
The U. S. Nuclear Regulatory Commission has been carrying out the Accident Sequence Precursor (ASP) Program to identify and categorize precursors to potential severe core damage accident sequences using the PSA technique. The ASP Program has identified a lot of risk significant events as precursors that occurred at U. S. nuclear power plants. The results from the ASP Program include valuable information that could be useful for obtaining risk significant insights and for monitoring risk trends in nuclear power industry. The present study examines and discusses quantitative risk trends for the industry level, using two indicators, that is, the occurrence frequency of precursors and the annual core damage probability, deriving from the ASP analysis results. It is shown that the core damage risk at U.S. nuclear power plants has been lowered and the likelihood of risk significant events has been remarkably decreasing. Also, the present study demonstrates that two risk indicators used here can provide quantitative information useful for monitoring risk trends in nuclear power industry.
ELMy H-mode discharges in JT-60UIsayama, Akihiko; Kamada, Yutaka; Hayashi, Nobuhiko; Suzuki, Takahiro; Oikawa, Toshihiro; Fujita, Takaaki; Fukuda, Takeshi; Ide, Shunsuke; Takenaga, Hidenobu; Ushigusa, Kenkichi; et al.
Nuclear Fusion, 43(10), p.1272 - 1278, 2003/10
Times Cited Count：131 Percentile：95.57(Physics, Fluids & Plasmas)no abstracts in English
Isayama, Akihiko; Iwama, Naofumi*; Showa, Takeshi*; Hosoda, Yosuke*; Isei, Nobuaki; Ishida, Shinichi; Sato, Masayasu
Japanese Journal of Applied Physics, Part 1, 42(9A), p.5787 - 5796, 2003/09
Times Cited Count：3 Percentile：15.50(Physics, Applied)no abstracts in English
Madarame, Haruki*; Okamoto, Koji*; Tanaka, Gentaro*; Morimoto, Yuichiro*; Sato, Akira*; Kondo, Masaya
JAERI-Tech 2003-017, 156 Pages, 2003/03
JAERI-Tech-2003-017.pdf:5.31MB
no abstracts in English
Isayama, Akihiko; Iwama, Naofumi*; Hosoda, Yosuke*; Satake, Shinsuke*; Isei, Nobuaki; Ishida, Shinichi; Sato, Masayasu
Japanese Journal of Applied Physics, Part 2, 42(3), p.L329 - L331, 2003/03
Times Cited Count：2 Percentile：10.61(Physics, Applied)no abstracts in English
laser for ion energy spectrum measurements in JT-60UKondoh, Takashi; Miura, Yukitoshi; Lee, S.*; Richards, R. K.*; Hutchinson, D. P.*; Bennett, C. A.*
Review of Scientific Instruments, 74(3), p.1642 - 1645, 2003/03
Times Cited Count：20 Percentile：67.81(Instruments & Instrumentation)Measurements of energy spectrum and density profile of confined alpha-particles are required for ITER. Several methods have been proposed, however, a measurement technique hasn't been established yet. A collective Thomson scattering (CTS) system based on a pulsed CO laser is being developed to demonstrate feasibility of alpha-particle diagnostics for ITER. The pulse laser (15J, 1
m, 0.6 m) and a wide band (~ 8GHz) heterodyne receiver with a quantum-well infrared photodetector (QWIP) have been developed and installed in the JT-60U tokamak. Stray light is reduced by a notch filter with hot CO gas. Heterodyne receiver is absolutely calibrated using large area blackbody radiation source. Scattered signal from JT-60U plasma has not detected because of electrical noise originated from discharge of the pulsed laser and stray signal caused by impurity of the spectrum of the pulsed laser.
Minehara, Eisuke; Yamauchi, Toshihiko; Sugimoto, Masayoshi; Sawamura, Masaru; Hajima, Ryoichi; Nagai, Ryoji; Kikuzawa, Nobuhiro; Nishimori, Nobuyuki; Shizuma, Toshiyuki
Proceedings of 27th Linear Accelerator Meeting in Japan, p.21 - 23, 2002/08
The JAERI superconducting rf linac-based free-electron laser(FEL) has been modified to recover the beam energy after the lasing utilizing a 360 degree recirculating loop and other components. Recent progress on the energy recovery experiments and future plans of the JAERI superconducting rf linac-based FELs will be reported and discussed briefly.
Iwai, Yasunori; Misaki, Yonosuke*; Hayashi, Takumi; Yamanishi, Toshihiko; Konishi, Satoshi; Nishi, Masataka; Ninomiya, R.*; Yanagimachi, S.*; Senrui, S.*; Yoshida, Hiroshi
Fusion Science and Technology, 41(3), p.1126 - 1130, 2002/05
no abstracts in English
Nakamura, Hisashi; Nakashima, Mikio
JAERI-Tech 2002-006, 58 Pages, 2002/03
JAERI-Tech-2002-006.pdf:2.56MB
Radiation exposure was estimated on production and utilization of recycled items using dismantling waste by assuming that their usage are restricted to nuclear facilities. The radiation exposure attributed to production of a steel-plate cast iron waste container, a receptacle for slag, and a drum reinforcement was calculated to be in the range of several Sv to several tens of Sv even in recycling contaminated metal waste of which radioactivity concentration of Co-60 is higher than the clearance level by a factor of two figures. It is also elucidated that casting of a multiple casting waste package meets the standards of dose equivalent rate for the transport of a radioactive package and the weight of the package will be able to kept around 20 tons for the convenience of the handling, in case of disposal of metal waste less than 37MBq/g with the steel-plate cast iron waste container. As the results, from the radiological exposure's point of view, it should be possible to use slightly contaminated metal for recycled items in waste management.
Isayama, Akihiko; Isei, Nobuaki; Ishida, Shinichi; Sato, Masayasu
Review of Scientific Instruments, 73(3), p.1165 - 1168, 2002/03
Times Cited Count：13 Percentile：57.29(Instruments & Instrumentation)no abstracts in English
Isei, Nobuaki; Isayama, Akihiko; Ishida, Shinichi; Sato, Masayasu; Oikawa, Toshihiro; Fukuda, Takeshi; Nagashima, Akira; Iwama, Naofumi*; JT-60 Team
Fusion Engineering and Design, 53(1-4), p.213 - 220, 2001/11
Times Cited Count：17 Percentile：74.36(Nuclear Science & Technology)no abstracts in English
Isayama, Akihiko; Isei, Nobuaki; Ishida, Shinichi; Sato, Masayasu; Kamada, Yutaka; Ide, Shunsuke; Ikeda, Yoshitaka; Takahashi, Koji; Kajiwara, Ken; Hamamatsu, Kiyotaka; et al.
Fusion Engineering and Design, 53(1-4), p.129 - 135, 2001/01
Times Cited Count：12 Percentile：64.13(Nuclear Science & Technology)no abstracts in English
Iwai, Yasunori; Yoshida, Hiroshi; Yamanishi, Toshihiko; Senrui, S.*; Nishi, Masataka
Fusion Engineering and Design, 49-50, p.847 - 853, 2000/11
Times Cited Count：17 Percentile：71.54(Nuclear Science & Technology)no abstracts in English
laser systemKondoh, Takashi; Lee, S.; Miura, Yukitoshi
Purazuma, Kaku Yugo Gakkai-Shi, 76(9), p.883 - 887, 2000/09
no abstracts in English
H-mode discharges in JT-60UIsayama, Akihiko; Kamada, Yutaka; Ozeki, Takahisa; Ide, Shunsuke
Proceedings of 10th International Toki Conference on Plasma Physics and Controlled Nuclear Fusion (ITC-10), p.94 - 98, 2000/00
no abstracts in English
