Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Katano, Ryota; Nishihara, Kenji; Kondo, Yasuhiro; Meigo, Shinichiro
JAEA-Research 2021-016, 16 Pages, 2022/03
JAEA-Research-2021-016.pdf:1.65MB
It has to be confirmed that the accelerator-driven system (ADS), which is dedicated to transmuting minor actinides, is subcritical in any state by measurements. In the previous research, we have proposed a procedure in which the core safely and efficiently approaches the target subcriticality before the operation. In this procedure, the reference value of the subcriticality at the initial state is measured by the area ratio method capable of the absolute value measurement. The area ratio method uses a pulsed neutron source. However, specific and practical parameters of the accelerator for the area ratio method have not been determined. In this study, we determined the accelerator parameters with the consideration of the uncertainties derived by the dead-time of the detector and the statistical error of the count ratio. In addition, we estimate the coating amount of the sample nuclide in the assumption of the use of the fission chambers.
Saito, Shigeru; Tsujimoto, Kazufumi; Kikuchi, Kenji; Kurata, Yuji; Sasa, Toshinobu; Umeno, Makoto*; Nishihara, Kenji; Mizumoto, Motoharu; Ouchi, Nobuo; Takei, Hayanori; et al.
Nuclear Instruments and Methods in Physics Research A, 562(2), p.646 - 649, 2006/06
Times Cited Count：25 Percentile：83.96(Instruments & Instrumentation)JAERI is conducting R&D on the Accelerator Driven System (ADS) to transmute minor actinides (MAs) contained in the high-level radioactive waste under the OMEGA (Options Making Extra Gains from Actinides and fission products) program. The present study discusses the design of the ADS plant and various R&D on the ADS. The reference design of ADS plant in JAERI is the 800 MWth, Pb-Bi eutectic (LBE) cooled, tank-type subcritical reactor loaded with (MA+Pu) nitride fuel. LBE is selected as a spallation target material. In our results of the optimization study on the neutronics of the ADS, we have adopted the maximum multiplication factor (k
) of 0.97. From the results of the thermal-hydraulic analysis around the LBE spallation target, partition wall and flow control nozzle are required to keep the structural integrity around the core and the beam window. Feasibility of beam window was also discussed for transient conditions of proton beam.
Sakurai, Kiyoshi; Yamamoto, Toshihiro
Nihon Genshiryoku Gakkai Wabun Rombunshi, 4(4), p.248 - 258, 2005/12
no abstracts in English
Sakurai, Kiyoshi; Nojiri, Ichiro*
JAERI-Conf 2003-019, p.855 - 857, 2003/10
This paper provides overview of sub-criticality safety analysis seminar (July 2000-July 2003, JAERI, total 40 engineers from universities, research institutes and enterprises) for nuclear fuel cycle facility with the Monte Carlo method in Japan. MCNP-4C2 system (MS-DOS version) was installed in each note-type personal computer. Fundamental theory of reactor physics and Monte Carlo simulation including MCNP-4C manual was lectured. Effective neutron multiplication factor and neutron spectrum were calculated for JCO deposit tank, JNC uranium solution storage tank, JNC plutonium solution storage tank and JAERI TCA core. In the seminar, methodology of safety management for nuclear fuel cycle facility was discussed in order to prevent criticality accident.
Oigawa, Hiroyuki
Genshiryoku eye, 49(7), p.74 - 77, 2003/07
An International Symposium on Accelerator Driven Transmutation System (ADS) and Asia ADS Network Initiative was held on March 24 and 25, 2003 by JAERI, Kyoto University, Osaka University, Tokyo Institute of Technology, and KEK. In the symposium, representatives of Japan, USA, Europe, Korea, and China presented their current status and future perspectives of ADS development, and discussion was held about the future international collaboration, especially for activation of interactions among Asian countries, and the promotion of interdisciplinary synergy between nuclear physics and nuclear engineering.
Iwanaga, Kohei; Yamane, Tsuyoshi; Nishihara, Kenji; Okajima, Shigeaki; Sekimoto, Hiroshi*; Asaoka, Takumi*
Proceedings of 11th International Conference on Nuclear Engineering (ICONE-11) (CD-ROM), 10 Pages, 2003/04
no abstracts in English
Yamamoto, Toshihiro; Miyoshi, Yoshinori; Tonoike, Kotaro; Okamoto, Hajime*; Ida, Toshikazu*; Aoki, Shigeaki*
Journal of Nuclear Science and Technology, 40(2), p.77 - 83, 2003/02
Times Cited Count：8 Percentile：49.89(Nuclear Science & Technology)no abstracts in English
Oigawa, Hiroyuki; Maekawa, Fujio; Meigo, Shinichiro; Kasugai, Yoshimi; Tsujimoto, Kazufumi; Nishihara, Kenji; Sasa, Toshinobu; Konno, Chikara; Kai, Tetsuya; Ikeda, Yujiro
JAERI-Tech 2002-037, 220 Pages, 2002/03
JAERI-Tech-2002-037.pdf:11.09MB
no abstracts in English
Oigawa, Hiroyuki
Nihon Butsuri Gakkai-Shi, 56(10), p.749 - 754, 2001/11
no abstracts in English
Sakurai, Kiyoshi
Nihon Genshiryoku Gakkai-Shi, 43(11), P. 1113, 2001/11
no abstracts in English
Mukaiyama, Takehiko
Genshikaku Kenkyu, 46(2), p.47 - 73, 2001/06
no abstracts in English
Nakahara, Yoshinori; Suyama, Kenya; Suzaki, Takenori
JAERI-Tech 2000-071, 381 Pages, 2000/10
JAERI-Tech-2000-071.pdf:17.6MB
no abstracts in English
Oigawa, Hiroyuki; Ikeda, Yujiro; Sasa, Toshinobu; Meigo, Shinichiro; Takano, Hideki; Tsujimoto, Kazufumi; Nishihara, Kenji
JAERI-Tech 2000-062, 64 Pages, 2000/09
JAERI-Tech-2000-062.pdf:4.25MB
no abstracts in English
Mukaiyama, Takehiko
Genshiryoku Shisutemu Nyusu, 11(1), p.5 - 13, 2000/06
no abstracts in English
Mukaiyama, Takehiko
Dai-38-kai Genshiryoku Sogo Shimpojium Rombunshu, p.1 - 9, 2000/05
no abstracts in English
Mukaiyama, Takehiko
Genshikaku Kenkyu, 44(6), p.23 - 32, 2000/04
no abstracts in English
Yamada, Susumu*
JNC TJ8400 2000-051, 122 Pages, 2000/02
JNC-TJ8400-2000-051.pdf:2.15MB
Developing an inexpensive on-line criticality surveillance system is required for ensuring the safety of nuclear fuel reprocessing plants. Based on the series of researches for five years, R&D study on On-line Criticality Surveillance System has been carricd out since 1996. The concept of this Criticality Surveillance System is based on the Auto-Regressive Moving Average (ARMA) model identification algorithms to the time series of signal fluctuation of a neutron detector. We have proposed several new ideas of modification to the original design of the Criticality Surveillance System, and also reported some results of numerical analysis over the DCA experiments. In those days, DOS/V personal computers with Microsoft Windows have came into wide use instead of those based on the MS-DOS, which have been popular in Japan. NEC, a major maker of MS-DOS computers, stopped the production of MS-DOS computers and changed their management policy toward production of DOS/V personal computers. Our researches have been developed using MS-DOS computers. For the effective use of these important results, it became an urgent theme to transplant all programs developed on MS_DOS computers into computers with the OS, which is not easily affected by commercialism. Since the design concept should be based on high reliability, electromagnetic disturbance-free and high expandability, and also computers have achieved remarkably high performance as well as low price in these days, these computers should be used not only as a simple signal processing unit but also a totally integrated signal analyzing system along with conventional signal analyzing software in stead of IC chips with analyzing soft wares. This configuration enables us to easily introduce newly developed techniques and to provide supplement information. Then, this approach can enhance the reliability of the Criticality Surveillance System without addition of any special devices, and also provide the flexibility of ...
JNC TN1400 2000-001, 371 Pages, 2000/01
JNC-TN1400-2000-001.pdf:12.26MB
no abstracts in English
Mukaiyama, Takehiko
EUR-19943-EN, p.129 - 138, 2000/00
no abstracts in English
Mukaiyama, Takehiko
Mirai, (6), p.40 - 43, 1999/07
no abstracts in English
