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Takahashi, Shigeo*; Sakurai, Daisuke*; Nagao, Fumiya; Kurikami, Hiroshi; Sanada, Yukihisa
Shimyureshon, 42(2), p.68 - 75, 2023/06
This paper introduces a case in which scientific knowledge on understanding the deposition process of radionuclides and evaluating the dose rate reduction due to decontamination work was obtained through visual analysis based on data on the spatio-temporal distribution of air dose rates accumulated through radiation monitoring after the accident. We will discuss the prospects for future efforts to effectively obtain important knowledge that will assist in the planning of policies for reconstruction from the nuclear power plant accident in the future.
Takahashi, Shigeo*; Kurikami, Hiroshi; Sanada, Yukihisa; Sakurai, Daisuke*
ERAN FY2022 Annual Report (Internet), 1 Pages, 2023/04
This study aims to establish a highly accurate evaluation technique for decontamination effects through multilateral and quantitative evaluation of decontamination effects. The applicability of the visual analysis technique was confirmed through a trial analysis.
Sato, Yuki
Isotope News, (781), p.19 - 23, 2022/06
no abstracts in English
Sato, Yuki
Kensa Gijutsu, 27(5), p.9 - 15, 2022/05
no abstracts in English
Kimura, Takashi; Tazaki, Makiko; Kitade, Yuta; Shimizu, Ryo; Tamai, Hiroshi; Nakanishi, Hiroaki; Suda, Kazunori
Nihon Kaku Busshitsu Kanri Gakkai Dai-39-Kai Nenji Taikai Rombunshu (Internet), 5 Pages, 2018/11
This is the summary of research result of State Level Concept (SLC) which has been developed and conducted by the IAEA and a major purpose of the research reported here is to promote the nuclear operator's understandings for the importance of Broder Conclusion drawn continuously by the IAEA under SLC.
Saito, Hiroshi; Nozawa, Takashi; Takemiya, Hiroshi; Seki, Akiyuki; Matsubara, Takeshi; Saito, Kimiaki; Kitamura, Akihiro
JAEA-Review 2017-040, 34 Pages, 2018/03
The accidents at Fukushima Daiichi Nuclear Power Station on March 11th 2011, released significant amount of radionuclide to the environment. It has migrated to the human habitation and raised concerns of possible effect on human health, and for that a lot of researches have been performed. JAEA created and opened "Database for Radioactive Substance Monitoring Data" for usage of obtained data. For accurate modelling and future forecast using numerical code and the data, "Supporting Environment for Processing Simulation Codes" has been operated. In addition, research results have been opened as Q&A style "Knowledge Base for Environmental Remediation" in JAEA's website. The "Comprehensive Evaluation System" composed of these components, should act more interrelated and integrated as one system. Besides, information dissemination is not enough to the outside. The report summarizes the current status, remaining issues and expected improvement of each component and the system.
Hazama, Osamu; Nakajima, Norihiro; Hirayama, Toshio; Post, P.*; Wolf, K.*
IWACOM, P. 161, 2004/11
The numerical methods and computational hardware of today allow for studies on multi-disciplinary simulations. We have been developing an "integrated numerical simulation system" to solve coupled simulation problems under meta-computing environments. The system aims to construct a competent coupler for carrying out multi-disciplinary simulations by allowing concurrent execution of arbitrary simulation codes on different computers in parallel. The effectiveness of this system infrastructure is illustrated through its applications to fluid-structure interactive problems.
Hazama, Osamu; Guo, Z.
Proceedings of International Conference on Supercomputing in Nuclear Applications (SNA 2003) (CD-ROM), p.119 - 120, 2003/09
In order for the numerical simulations to reflect textquotedblleft real-worldtextquotedblright phenomena and occurrences, incorporation of multidisciplinary and multi-physics simulations considering various physical models and factors are becoming essential. However, there still exist many obstacles which inhibit such numerical simulations. For example, it is still difficult in many instances to develop satisfactory software packages which allow for such coupled simulations and such simulations will require more computational resources. A precise multi-physics simulation today will require parallel processing which again makes it a complicated process. Under the international cooperative efforts between CCSE/JAERI and Fraunhofer SCAI, a German institute, a library called the MpCCI, or Mesh-based Parallel Code Coupling Interface, has been implemented together with a library called STAMPI to couple two existing codes to develop an textquotedblleft integrated numerical simulation systemtextquotedblright intended for meta-computing environments.
Hazama, Osamu; Guo, Z.
Keisan Kogaku Koenkai Rombunshu, 8(2), p.759 - 760, 2003/05
no abstracts in English
Shimooka, Takashi; Oguri, Hidetomo; Namekawa, Yuya*; Tomisawa, Tetsuo; Okumura, Yoshikazu; Hasegawa, Kazuo
JAERI-Tech 2002-038, 30 Pages, 2002/03
The high intensity proton accelerator facility project which is conducted jointly by JAERI and KEK is to use the secondary particles produced by nuclear spallation for various science studies. A negative hydrogen ion beam source for the accelerator is required to extract a peak beam current of more than 60 mA with a duty factor of 2.5 %. In addition, the ions should be negatively charged in order to improve the capture efficiency of the beam injected into a synchrotron. At JAERI, a negative ion source for the project has been developed with various technologies based on the large negative ion source for the nuclear fusion application. The negative ion beam current and the rms normalized emittance of 72 mA and 0.15 mm.mrad were achieved in the cesium seeded operation, respectively. A waveform of the pulsed beam current was sensitive to the operation gas flow rate, and became to have a good flatness at about 16 SCCM. These results show that the basic performance of the ion source satisfies the requirement of the ion source for the project.
Takase, Kazuyuki; Akimoto, Hajime; Torilski, L. N.*
Fusion Engineering and Design, 54(3-4), p.593 - 603, 2001/04
Times Cited Count:16 Percentile:73.13(Nuclear Science & Technology)no abstracts in English
Onishi, Ryoichi*; Guo, Z.*; Imamura, Toshiyuki; Hirayama, Toshio
GMD Report 132, 1 Pages, 2001/04
no abstracts in English
Meigo, Shinichiro
JAERI-Tech 2000-088, 32 Pages, 2001/02
no abstracts in English
Mizumoto, Motoharu
KEK Proceedings 2000-23, p.1 - 3, 2001/02
no abstracts in English
Takase, Kazuyuki; Ose, Yasuo*; Shibata, Mitsuhiko; Akimoto, Hajime
Dai-38-Kai Nihon Dennetsu Shimpojiumu Koen Rombunshu, p.641 - 642, 2001/00
no abstracts in English
Takase, Kazuyuki; Ose, Yasuo*; Akimoto, Hajime
Fusion Engineering and Design, 51-52, p.623 - 630, 2000/11
Times Cited Count:1 Percentile:12.08(Nuclear Science & Technology)no abstracts in English
Hagiwara, Shigeru*; Sakamoto, Yoshiaki; Takebe, Shinichi; Okuda, Katsuzo*; Ogawa, Hiromichi
JAERI-Research 2000-039, 119 Pages, 2000/09
no abstracts in English
Nibe, Nobuaki; Shimakawa, Yoshio; ; Hayafune, Hiroki; ; ;
JNC TN9400 2000-074, 388 Pages, 2000/06
Large sized sodium-cooled fast breeder reactors of large-size are being studied and have been operated in Japan and many countries. ln this feasibility study, evaluation was made on technical feasibinty for design concepts or 1 loop type and 3 pool types, specially from the viewpoint of improvement of economical competence. The design concepts include the ideas of cost reduction measures such as large-scaled components, reduction of loop number and integration of components on the basic of utilization of sodium characteristics. From the results of the evaluation, it may be possible for all the concepts to attain the economical target of 200 thousands yen per kilowatt, though further confirmation should be made for technical feasibility of those concepts. ln addition, the following items were listed up as further cost-reduction measures. (1)Higher temperature cooling system and steam cycle efficiency (2)Shortening of construction term (3)Reduction of safety systems by using measuring instruments with high performmce (4)Adoption of SG-ACS
Takase, Kazuyuki; Ose, Yasuo*; Akimoto, Hajime
Dai-37-Kai Nihon Dennetsu Simpojiumu Koen Rombunshu, p.703 - 704, 2000/05
no abstracts in English
Yokoyama, Kenji*; Numata, Kazuyuki*; Ishikawa, Makoto*; Oigawa, Hiroyuki; Iijima, Susumu
JNC-TY9400 2000-006, 168 Pages, 2000/04
no abstracts in English