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Sun, D.*; Wainwright-Murakami, Haruko*; Oroza, C. A.*; Seki, Akiyuki; Mikami, Satoshi; Takemiya, Hiroshi; Saito, Kimiaki
Journal of Environmental Radioactivity, 220-221, p.106281_1 - 106281_8, 2020/09
Times Cited Count：9 Percentile：43.42(Environmental Sciences)We have developed a methodology for optimizing the monitoring locations of radiation air dose-rate monitoring. For the method, we use a Gaussian mixture model to identify the representative locations among multiple environmental variables, such as elevation and land-cover types. Next, we use a Gaussian process model to capture and estimate the heterogeneity of air-dose rates across the domain. Our results have shown that this approach allows us to select monitoring locations in a systematic manner such that the heterogeneity of air dose rates is captured by the minimal number of monitoring locations.
Hoshino, Takanori; Kitagaki, Toru; Yano, Kimihiko; Okamura, Nobuo; Ohara, Hiroshi*; Fukasawa, Tetsuo*; Koizumi, Kenji
Proceedings of 23rd International Conference on Nuclear Engineering (ICONE-23) (DVD-ROM), 6 Pages, 2015/05
Fukushima Environmental Safety Center, Sector of Fukushima Research and Development
JAEA-Review 2014-051, 121 Pages, 2015/03
JAEA-Review-2014-051.pdf:64.45MB
The Japan Atomic Energy Agency (JAEA) was charged with conducting a range of "Decontamination Pilot Project" to examine the applicability of decontamination technologies. The project was implemented at 16 sites in 11 municipalities within the evacuated zone. Despite tight boundary conditions in terms of timescale and resources, the project provides a good basis for developing recommendations on how to assure decontamination efficiency and worker safety whilst additionally constraining costs, subsequent waste management and environmental impacts. This report, based on the Japanese detailed reports that have been published elsewhere, consists of two volumes. This volume 1 summarises the Decontamination Pilot Project, providing the background required to put this work in context for an international audience. In volume 2, the subsequent application of output from these projects to regional remediation now being conducted by the Japanese government and municipalities, is discussed, along with a status update on such work, an overview of associated JAEA's R&D and international input to/review of regional environmental decontamination in Fukushima.
Yonekawa, Izuru; Kawamata, Yoichi; Totsuka, Toshiyuki; Akasaka, Hiromi; Sueoka, Michiharu; Yoshida, Hidetoshi
Fusion Engineering and Design, 71(1-4), p.11 - 15, 2004/06
Times Cited Count：5 Percentile：35.25(Nuclear Science & Technology)The JT-60 control system based on workstation and VME-bus system features with UNIX system has been successfully performed at JT-60U advanced plasma experiment. The various hardware modifications and the adoption of the advanced plasma control algorithms have been continued to the JT-60 control system since its upgrade in 1991. The ZENKEI, supervisory control system, has entirely remodeled from its original 16 bits minicomputer and CAMAC system to the combination of workstation and VME-bus system configuration with Ethernet communication network system. The plasma control system executes real-time plasma equilibrium control command calculation within 250msec control cycle time. Each plant control subsystems are also modified along with same design concept to the ZENKEI. Currently, the minor modifications of the control system have been considered to realize longer pulse of discharge experiments without major change of the JT-60 equipment. Nearly 60 seconds of pulse length up to Ip=2MA, Bt=2T, PNBI=10MW(
30sec) plasma experiments will start from October in 2003.
Yonekawa, Izuru; Kawamata, Yoichi; Totsuka, Toshiyuki; Akasaka, Hiromi; Sueoka, Michiharu; Kurihara, Kenichi; Kimura, Toyoaki; JT-60U Team
Fusion Science and Technology (JT-60 Special Issue), 42(2-3), p.521 - 529, 2002/09
Times Cited Count：5 Percentile：34.58(Nuclear Science & Technology)The present status of JT-60 control system is reported including its original design concept, the progress of the system and various modifications since JT-60 upgrade. This control system has features of a functionally distributed and hierarchical structure, using CAMAC interfaces at the beginning, which are replaced to versatile module Europe (VME)-bus interfaces later, and a protective interlock system composed of both software and hard-wired interlock logics. Plant monitoring and control are performed by efficient data communication through CAMAC highways and Ethernet with TCP/IP protocols. Sequential control of a plasma discharges are executed by a combination of a remodeled VME-bus system and a timing system. At real-time plasma control system and a human interface system have been continuously modified corresponding to the progress of JT-60 experiments.
Totsuka, Toshiyuki; Akasaka, Hiromi; Sueoka, Michiharu; Takano, Shoji*; Yonekawa, Izuru
Fusion Engineering and Design, 60(3), p.409 - 414, 2002/06
Times Cited Count：2 Percentile：17.03(Nuclear Science & Technology)no abstracts in English
Takahashi, Hiroki; ; Yamamoto, Kazuyoshi; Yoritsune, Tsutomu
JAERI-Conf 99-006, p.125 - 130, 1999/08
no abstracts in English
Watanabe, Tadashi; Ebihara, Kenishi; Kato, Katsumi*
JAERI-Data/Code 99-029, 38 Pages, 1999/05
JAERI-Data-Code-99-029.pdf:1.58MB
no abstracts in English
Yanagihara, Satoshi; Sukegawa, Takenori; Tanabe, Norio*; Takaya, Junichi*
Proc. of SPECTRUM'98, p.269 - 274, 1998/00
no abstracts in English
Totsuka, Toshiyuki; Kurihara, Kenichi
JAERI-Tech 97-026, 47 Pages, 1997/06
no abstracts in English
Hoken Butsuri, 29, p.460 - 462, 1994/00
no abstracts in English
Nishimura, Hideo; Nishizawa, Satoshi
Dai-14-Kai Kaku Busshitsu Kanri Gakkai (INMN) Nihon Shibu Nenji Taikai Rombunshu, p.155 - 162, 1993/11
no abstracts in English
Totsuka, Toshiyuki
JAERI-M 93-158, 36 Pages, 1993/08
no abstracts in English
; Onodera, Emi*; Masukawa, Fumihiro; Naito, Yoshitaka; Imawaka, Tsuneyuki*; Yoda, Yoshihisa*
JAERI-M 93-128, 50 Pages, 1993/07
no abstracts in English
; Sasaki, Mikio*; *; *
JAERI-M 93-050, 72 Pages, 1993/03
no abstracts in English
Masukawa, Fumihiro; ; Inoue, Osamu*; Hara, Toshiharu*
JAERI-M 93-024, 31 Pages, 1993/02
no abstracts in English
; Masukawa, Fumihiro; Naito, Yoshitaka; Ido, Masaru*; *
JAERI-M 92-193, 62 Pages, 1992/12
no abstracts in English
Chino, Masamichi
JAERI-M 92-082, 82 Pages, 1992/06
no abstracts in English
Yonekawa, Izuru; Shimono, Mitsugu; Totsuka, Toshiyuki; Yamagishi, Kojiro
Proc. of the 14th Symp. on Fusion Engineering,Vol. 2, p.798 - 801, 1992/00
no abstracts in English
; Nakakawa, Masayuki; Mori, Takamasa; Kugo, Teruhiko
Proc. of the Int. Conf. on Design and Safety of Advanced Nuclear Power Plants,Vol. 3, p.32.1_1 - 32.1_8, 1992/00
no abstracts in English
