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Takeda, Tetsuaki*; Inagaki, Yoshiyuki; Aihara, Jun; Aoki, Takeshi; Fujiwara, Yusuke; Fukaya, Yuji; Goto, Minoru; Ho, H. Q.; Iigaki, Kazuhiko; Imai, Yoshiyuki; et al.
High Temperature Gas-Cooled Reactors; JSME Series in Thermal and Nuclear Power Generation, Vol.5, 464 Pages, 2021/02
As a general overview of the research and development of a High Temperature Gas-cooled Reactor (HTGR) in JAEA, this book describes the achievements by the High Temperature Engineering Test Reactor (HTTR) on the designs, key component technologies such as fuel, reactor internals, high temperature components, etc., and operational experience such as rise-to-power tests, high temperature operation at 950
C, safety demonstration tests, etc. In addition, based on the knowledge of the HTTR, the development of designs and component technologies such as high performance fuel, helium gas turbine and hydrogen production by IS process for commercial HTGRs are described. These results are very useful for the future development of HTGRs. This book is published as one of a series of technical books on fossil fuel and nuclear energy systems by the Power Energy Systems Division of the Japan Society of Mechanical Engineers.
Sanada, Yukihisa; Kondo, Atsuya*; Sugita, Takeshi*; Nishizawa, Yukiyasu; Yuki, Yoichi*; Ikeda, Kazutaka*; Shoji, Yasunori*; Torii, Tatsuo
Exploration Geophysics, 45(1), p.3 - 7, 2014/11
Times Cited Count：34 Percentile：71.34(Geochemistry & Geophysics)The Great East Japan Earthquake on March 11, 2011 generated a series of large tsunami waves that resulted serious damage to the Fukushima Daiichi Nuclear Power Plant (NPP) and a large amount of radioactive materials were discharged from the NPP to the environment. In recent years, technologies for an unmanned helicopter have been developed and applied to various fields. In expectation of the application of the unmanned helicopter to airborne radiation monitoring, we had developed a radiation monitoring system. Then, we measured the radiation level by using unmanned helicopter in soil contaminated areas by radioactive cesium emitted from the NPP to evaluate ambient dose-rate distribution around the areas. Here, we reports on the measurement technique and the result.
Shimizu, Atsushi; Furusawa, Takayuki; Homma, Fumitaka; Inoi, Hiroyuki; Umeda, Masayuki; Kondo, Masaaki; Isozaki, Minoru; Fujimoto, Nozomu; Iyoku, Tatsuo
Journal of Nuclear Science and Technology, 51(11-12), p.1444 - 1451, 2014/11
Times Cited Count：1 Percentile：8.88(Nuclear Science & Technology)JAEA has kept up a data-base system of operation and maintenance experiences of the HTTR. The objective of this system is to share the information obtained operation and maintenance experiences and to make use of lessons learned and knowledge into a design, construction and operation managements of the future HTGR. More than one thousand records have been registered into the system between 1997 and 2012. This paper describes the status of the data-base system, and provides suggestions for improvement from four experiences: (1) performance degradation of helium compressors; (2) malfunction of reserved shutdown system in reactivity control system; (3) maintenance experiences of emergency gas turbine generators; and (4) experiences of the Great East Japan Earthquake. These experiences are extracted from the system as important lessons learned to be expected to apply for design, construction and operation managements of future HTGR.
Sanada, Yukihisa; Sugita, Takeshi; Nishizawa, Yukiyasu; Kondo, Atsuya*; Torii, Tatsuo
Progress in Nuclear Science and Technology (Internet), 4, p.76 - 80, 2014/04
The ambient dose-rate and the deposition concentration of radioactive cesium was measured by using helicopters in the whole area of Japan to investigate the influence of the radioactivity that released in the atmosphere due to the disaster of the Fukushima Daiichi NPP (Nuclear Power Plant), Tokyo Electric Power Company (TEPCO), occurred by the East Japan earthquake and tsunami on March 11, 2011. As a result, the deposition of radioactive cesium on the ground discharged from the Fukushima Daiichi NPP was obtained, and it was clarified that the scattered range of the cesium had been almost limited from the southern part of Tohoku to Kanto areas. The variation distribution of the dose-rate of Japan was also revealed in this measurement.
Sanada, Yukihisa; Nishizawa, Yukiyasu; Yamada, Tsutomu; Ikeda, Kazutaka*; Matsui, Masashi*; Tsuchida, Kiyofumi; Sato, Yoshiharu; Hirayama, Hirokatsu; Takamura, Yoshihide; Nishihara, Katsuya; et al.
JAEA-Research 2013-049, 129 Pages, 2014/03
JAEA-Research-2013-049.pdf:15.5MB
By the nuclear disaster of Fukushima Daiichi Nuclear Power Plant (NPP), Tokyo Electric Power Company (TEPCO), caused by the East Japan earthquake and the following tsunami occurred on March 11, 2011, a large amount of radioactive materials was released from the NPP. In recent years, technologies for autonomous unmanned helicopters (AUHs) have been developed and applied to natural disasters. In expectation of the application of the AUHs to aerial radiation monitoring, we had developed a remote radiation monitoring system. Then, we measured the radiation level by using unmanned helicopter in soil contaminated areas by radioactive cesium emitted from the NPP to evaluate ambient dose-rate distribution around the areas and to investigate the decontamination effect by the measurements before and after decontamination treatment. Here, we reports on the measurement technique and the result.
Torii, Tatsuo; Sanada, Yukihisa; Sugita, Takeshi; Kondo, Atsuya*; Shikaze, Yoshiaki; Takahashi, Masaki; Ishida, Mutsushi; Nishizawa, Yukiyasu; Urabe, Yoshimi
JAEA-Technology 2012-036, 182 Pages, 2012/12
JAEA-Technology-2012-036.pdf:41.89MB
We carried out aerial radiation monitoring (ARM) of all Japan area in order to investigate the influence of the radio cesium which was emitted into the atmosphere by disaster of the Fukushima Dai-ichi Nuclear Power Plant of Tokyo Electric Power Co., Inc.. AMS can measure a 
ray quickly by flight from 300 m height above the ground. Moreover, ARM has an advantage which can grasp self-possessed quantity distribution of an air dose rate and radioactive cesium in "field", and is visually intelligible. Although there were apparatus and the technique of ARM in our country, sufficient preparations for wide area monitoring were not made. Therefore, it fixed based on the method of the U.S. Department of Energy (DOE) about the method of the conversion to all radiation dose, and the conversion method to radiocesium deposition and the method of mapping. It is possible to discriminate from a background (cosmic-ray, self-contamination and natural nuclides) at the time of western-part-of-Japan measurement by improving of the method in parallel to data acquisition. By this monitoring, it was able to check about the distribution situation of the air dose rate of the Japanese whole region, or the radioactive cesium deposition. Here, the measurement technique and a result are described.
Sanada, Yukihisa; Kondo, Atsuya; Sugita, Takeshi; Torii, Tatsuo
Hoshasen, 38(3), p.137 - 140, 2012/12
We have measured the ambient dose-rate and the deposition amount of radioactive cesium by using four helicopters in the whole area of Japan to investigate the influence of the radioactivity that released in the atmosphere due to the disaster of the Fukushima Dai-ichi NPP (Nuclear Power Plant), Tokyo Electric Power Company (TEPCO), caused by the Tohoku-Pacific Ocean Earthquake and tsunami on March 11, 2011. We report on the measurement technique and the result.
studied by resonant inelastic X-ray scatteringInami, Toshiya; Fukuda, Tatsuo; Mizuki, Junichiro; Ishihara, Sumio*; Kondo, Hiroshi*; Nakao, Hironori*; Matsumura, Takeshi*; Hirota, Kazuma*; Murakami, Yoichi*; Maekawa, Sadamichi*; et al.
Physical Review B, 67(4), p.045108_1 - 045108_6, 2003/01
Times Cited Count：56 Percentile：87.96(Materials Science, Multidisciplinary)We report resonant inelastic x-ray scattering experiments of the orbitally ordered manganite LaMnO. When incident photon energy is tuned near the Mn 
absorption edge, the spectra reveal three features at 2.5 eV, 8 eV and 11 eV. The 8 eV and 11 eV peaks are ascribed to transitions from the O 2
bands to the empty Mn 3
and 
/
bands, respectively. On the other hand, the 2.5 eV peak is considered an orbital excitation across the Mott gap, 
an electron excitation from the effective lower Hubbard band with the 
and 
orbital characters to the upper Hubbard band with the 
and 
ones. The weak dispersion and characteristic azimuthal angle dependence of this excitation are well reproduced by a theory which includes orbital degeneracy and strong electron correlation.
Takeuchi, Hiroshi; Sugimoto, Masayoshi; Nakamura, Hiroo; Yutani, Toshiaki*; Ida, Mizuho*; Jitsukawa, Shiro; Kondo, Tatsuo; Matsuda, Shinzaburo; Matsui, Hideki*; Shannon, T. E.*; et al.
Fusion Energy 2000 (CD-ROM), 5 Pages, 2001/00
no abstracts in English
Ehrlich, K.*; Bloom, E. E.*; Kondo, Tatsuo
Journal of Nuclear Materials, 283-287(1), p.79 - 88, 2000/12
Times Cited Count：86 Percentile：97.75(Materials Science, Multidisciplinary)no abstracts in English
*; Kurata, Yuji; ; Nakajima, Hajime; Kondo, Tatsuo
Nihon Genshiryoku Gakkai-Shi, 36(10), p.967 - 975, 1994/00
Times Cited Count：0 Percentile：0.01(Nuclear Science & Technology)no abstracts in English
Tsuji, Hirokazu; Nakajima, Hajime; Kondo, Tatsuo
Proc. of the 5th Conf. on Materials for Advanced Power Engineering,Part I, 0, p.939 - 948, 1994/00
no abstracts in English
Kondo, Tatsuo; Hishinuma, Akimichi; Noda, Kenji; Eto, Motokuni; Tsuji, Hirokazu; Nakajima, Hajime; Kiuchi, Kiyoshi; Ono, Hideo; Ogawa, Toru; Omichi, Hideki; et al.
Genshiryoku Kogyo, 39(8), p.1 - 80, 1993/08
no abstracts in English
Tsuji, Hirokazu; *; Nakajima, Hajime; Kondo, Tatsuo
JAERI-M 93-078, 42 Pages, 1993/05
no abstracts in English
Tsuji, Hirokazu; Nakajima, Hajime; Kondo, Tatsuo
JAERI-M 92-215, p.584 - 598, 1993/01
no abstracts in English
Kondo, Tatsuo; Ono, Hideo; R.A.Jameson*; J.A.Hassberger*
Fusion Engineering and Design, 22, p.117 - 127, 1993/00
Times Cited Count：6 Percentile：55.97(Nuclear Science & Technology)no abstracts in English
K control modesTsuji, Hirokazu; ; Nakajima, Hajime; Kondo, Tatsuo
Journal of Nuclear Materials, 202, p.79 - 86, 1993/00
Times Cited Count：1 Percentile：18.76(Materials Science, Multidisciplinary)no abstracts in English
Tsuji, Hirokazu; Nakajima, Hajime; Kondo, Tatsuo
Proc. of the 2nd ASME/JSME Nuclear Engineering Joint Conf., 1993,Vol. 2, p.167 - 172, 1993/00
no abstracts in English
Tsuji, Hirokazu; Nakajima, Hajime; Kondo, Tatsuo
Proc. of the Int. Conf. on Computer-assisted Materials Design and Process Simulation, p.398 - 403, 1993/00
no abstracts in English
Nakajima, Hajime; Kondo, Tatsuo
Gensan Semina "Koon Gasuro Kaihatsu To Netsu Riyo Gijutsu No Tembo", p.1 - 12, 1992/02
no abstracts in English
