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Tanaka, Taiki*; Morita, Kosuke*; Morimoto, Koji*; Kaji, Daiya*; Haba, Hiromitsu*; Boll, R. A.*; Brewer, N. T.*; Van Cleve, S.*; Dean, D. J.*; Ishizawa, Satoshi*; et al.
Physical Review Letters, 124(5), p.052502_1 - 052502_6, 2020/02
Times Cited Count:19 Percentile:81.08(Physics, Multidisciplinary)Yamada, Tomonori; Takebe, Toshihiko*; Ishizuka, Ippei*; Daido, Hiroyuki*; Hanari, Toshihide; Shibata, Takuya; Omori, Shinya*; Kurosawa, Koichi*; Sasaki, Go*; Nakada, Masahiro*; et al.
Journal of Nuclear Science and Technology, 56(12), p.1171 - 1179, 2019/12
Times Cited Count:1 Percentile:11.15(Nuclear Science & Technology)We describe a new chipping technique combined with a water-jet technique as one of the candidate techniques for the retrieval of fuel debris and support structures as part of the decommissioning of the Fukushima Daiichi Nuclear Power Station. We performed proof-of-principle experiments to demonstrate the removal capability of metal parts, where we focused on the observation of removal processes from a metallic sample using a 5.5-kW continuous wave fiber laser combined with continuous and pulsed water jets.
Torigoe, Shuhei*; Hattori, Takayuki*; Kodama, Katsuaki; Honda, Takashi*; Sagayama, Hajime*; Ikeda, Kazutaka*; Otomo, Toshiya*; Nitani, Hiroaki*; Abe, Hitoshi*; Murakawa, Hiroshi*; et al.
Physical Review B, 98(13), p.134443_1 - 134443_7, 2018/10
Times Cited Count:11 Percentile:52.03(Materials Science, Multidisciplinary)Hanari, Toshihide; Takebe, Toshihiko*; Yamada, Tomonori; Daido, Hiroyuki; Ishizuka, Ippei*; Omori, Shinya*; Kurosawa, Koichi*; Sasaki, Go*; Nakada, Masahiro*; Sakai, Hideaki*
Proceedings of 2017 International Congress on Advances in Nuclear Power Plants (ICAPP 2017) (CD-ROM), 3 Pages, 2017/04
In decommissioning of Fukushima Daiichi Nuclear Power Station, a retrieval process of fuel debris in the Primary Containment Vessel by a remote operation is one of the key issues. In this process, prevention of spreading radioactive materials is one of the important considerations. Furthermore, an applicable technique to the process requires keeping of reasonable processing-efficiency. We propose to use the combined technique including a laser light and a water jet as a retrieval technique of the fuel debris. The laser processing technique combined with a repetitive pulsed water jet could perform an efficient retrieval processing. Our experimental result encourages us to promote further development of the technique towards a real application at Fukushima Daiichi Nuclear Power Station.
Sakai, Hideaki*; Fujioka, Jun*; Fukuda, Tatsuo; Bahramy, M. S.*; Okuyama, Daisuke*; Arita, Ryotaro*; Arima, Takahisa*; Baron, A. Q. R.*; Taguchi, Yasujiro*; Tokura, Yoshinori*
Physical Review B, 86(10), p.104407_1 - 104407_11, 2012/09
Times Cited Count:30 Percentile:74.69(Materials Science, Multidisciplinary)Taguchi, Yasujiro*; Sakai, Hideaki*; Okuyama, Daisuke*; Ishiwata, Shintaro*; Fujioka, Jun*; Fukuda, Tatsuo; Hashizume, Daisuke*; Kagawa, Fumitaka*; Takahashi, Yoichiro*; Shimano, Ryo*; et al.
Physica B; Condensed Matter, 407(11), p.1685 - 1688, 2012/06
Times Cited Count:5 Percentile:23.98(Physics, Condensed Matter)Hase, Masashi*; Dnni, A.*; Ozawa, Kiyoshi*; Kitazawa, Hideaki*; Sakai, Osamu*; Pomjakushin, V. Y.*; Keller, L.*; Kaneko, Koji; Metoki, Naoto; Kakurai, Kazuhisa; et al.
Journal of Physics; Conference Series, 340, p.012066_1 - 012066_7, 2012/00
Times Cited Count:1 Percentile:44.95(Physics, Condensed Matter)We determined the magnetic structure below K of the spin-5/2 antiferromagnetic (AF) trimer substance SrMnPO using neutron powder diffraction experiments. The incommensurate propagation vector is expressed as [0, , 0], due to competition between the nearest-neighbor and next-nearest-neighbor interactions in trimerized chains. The value of is 0.316 to 0.331, changing rapidly at K. We confirmed that the intra-trimer interaction is AF. The magnetic excitation peaks were obsereved at 0.46, 0.68, and 1.02 meV. The weak Q dependence indicates the discrete energy levels, which do not contradict the AF trimer model with the intra-trimer interaction value of 0.29 meV (3.4 K).
Inami, Toshiya; Terada, Noriki*; Kitazawa, Hideaki*; Sakai, Osamu*
Journal of Physics; Conference Series, 200, p.032022_1 - 032022_4, 2010/02
Times Cited Count:0 Percentile:0.04(Materials Science, Multidisciplinary)Inami, Toshiya; Terada, Noriki*; Kitazawa, Hideaki*; Sakai, Osamu*
Journal of the Physical Society of Japan, 78(8), p.084713_1 - 084713_5, 2009/08
Times Cited Count:13 Percentile:60.89(Physics, Multidisciplinary)Saha, P. K.; Noda, Fumiaki*; Irie, Yoshiro; Hotchi, Hideaki; Takayanagi, Tomohiro; Hayashi, Naoki; Machida, Shinji*; Sakai, Izumi*
Proceedings of 2005 Particle Accelerator Conference (PAC '05) (CD-ROM), p.3739 - 3741, 2005/00
The RCS(rapid cycling synchrotron) of J-PARC(Japan proton accelerator research complex) acts as an injector to the main ring as well as a high-power beam for the spallation neutron source at a repetition rate of 25 Hz, where at present the injection and the extraction beam energy are chosen to be 0.181 GeV and 3.0 GeV, respectively. The present work concerns on the present design and calculations for the injection-dump line of the RCS, which includes, (1) an accurate aperture list of all elements taking into account a wide range of the betatron tune, effect of changing injection modes, multiple trajectories of different particles after the charge-exchange foil(like H0 from the H- and H- beam itself)and (2) an accurate estimation of the uncontrolled beam losses especially from the H0-excited states, multiple coulomb scattering at the charge-exchange foil and also the lorentz stripping loss at the septum magnets so as to optimize them concerning mainly the radiation issues as well as for the hands-on maintenance.
Sugita, Yutaka; Suzuki, Hideaki*; Ito, Akira; Sakai, Yuichi*; Kawakami, Susumu
JNC TN8400 2003-045, 61 Pages, 2004/02
Japan Nuclear Cycle Development Institute has joined the international project, the Tunnel Sealing Experiment, to demonstrate the sealing performance of the full scale plugs in-situ, and to develop analytical method of the sealing performance of the plugs at the Underground Research Laboratory of Atomic Energy of Canada Limited in Canada. We performed the analysis of the sealing performance of the full scale plugs considering the monitored data on sealing performance of the plugs. In these analyses, stress analysis, hydraulic analysis and coupled stress-hydraulic analysis were performed to explain distribution of the pore pressure in host rock and seepage through plugs.Stress analysis showed the stress condition in host around the test tunnel. Hydraulic and coupled stress-hydraulic analyses showed the change with time of pore pressure and seepages considering schedules of opening of the test tunnel, installation of the plugs and pressurizing of the chamber. Since opening the test tunnel caused changes of the pore pressure in host rock around the test tunnel, the coupled stress-hydraulic analysis explained distribution of the pore pressure in the host rock around the test tunnel and seepage through plugs.
Omi, Masao; Mimura, Hideaki; ; Fukaya, Kiyoshi; Yonekawa, Minoru; Goto, Ichiro; ; Saito, Junichi; Eto, Motokuni;
JAERI-Tech 96-005, 39 Pages, 1996/02
no abstracts in English
Hikita, Keiichi; Uchida, Naoki; Suzuki, Kazuyuki; Mitani, Hironobu; Hata, Katsuro; Hayashi, Shinichiro; Yudo, Mitsuhiro*; Sakai, Hideaki*
no journal, ,
TRP dissolver deposits dissolver sludge which consists of zircaloy swarf with shearing operation and undissolved fission products such as Mo, Ru, Rh and Pd with dissolution operation. We have developed dissolver cleaning device which can be introduced through a ventilation pipe to inside dissolver.
Maekawa, Keisuke; Suzuki, Hideaki*; Sakai, Yuichi; Nakama, Shigeo; Sugita, Yutaka
no journal, ,
no abstracts in English
Hajima, Ryoichi; Kando, Masaki; Shizuma, Toshiyuki; Hayakawa, Takehito; Ogaki, Hideaki*; Daito, Izuru*; Negm, H.*; Hori, Toshitada*; Fujimoto, Shinya*; Sakai, Fumio*
no journal, ,
no abstracts in English
Takebe, Toshihiko*; Hanari, Toshihide; Yamada, Tomonori; Daido, Hiroyuki; Ishizuka, Ippei*; Omori, Shinya*; Kurosawa, Koichi*; Sasaki, Go*; Nakada, Masahiro*; Sakai, Hideaki*
no journal, ,
no abstracts in English
Hanari, Toshihide; Takebe, Toshihiko*; Yamada, Tomonori; Daido, Hiroyuki; Ishizuka, Ippei*; Omori, Shinya*; Kurosawa, Koichi*; Sasaki, Go*; Nakada, Masahiro*; Sakai, Hideaki*
no journal, ,
no abstracts in English
Ishizuka, Ippei*; Takebe, Toshihiko*; Yamada, Tomonori; Omori, Shinya*; Kurosawa, Koichi*; Sasaki, Go*; Nakada, Masahiro*; Sakai, Hideaki*; Shibata, Takuya
no journal, ,
no abstracts in English
Yamada, Tomonori; Ishizuka, Ippei*; Takebe, Toshihiko*; Hanari, Toshihide; Omori, Shinya*; Kurosawa, Koichi*; Sasaki, Go*; Nakada, Masahiro*; Sakai, Hideaki*; Shibata, Takuya; et al.
no journal, ,
no abstracts in English
村松 壽晴; 山田 知典; 羽成 敏秀; 武部 俊彦; 松永 幸大
酒井 英明*; 碓井 秀三*; 中田 正宏*; 坪井 昭彦*; 社本 英泰*
【課題】異なる材料が混在して、無定形で不規則な外形を有する処理対象物を、その材料に対応して溶断あるいは破砕できるレーザー光を用いた溶断・破砕適応制御装置を提供する。 【解決手段】レーザー加工ヘッド6を搭載したロボット1、対象物19の状態を検出する検出部3、検出情報に基づいてロボット1を制御する制御部2を備え、検出部3は対象物19からのレーザー光8の反射光25を受光し、反射光25に基づいて対象物19の形状を認識するレーザースキャナ12、反射光25に基づいて対象物19の材質を検出する分光計1と、反射光25に基づいて対象物19の溶断の有無を検出する温度計13を有し、制御部2は検出部3からの情報に基づいて、ロボットをするロボット制御部と、レーザー光8を制御するレーザー光制御部9を有している。