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Okawa, Yukihisa*; Masuda, Takuya*; Uehara, Hiromitsu*; Matsumura, Daiju; Tamura, Kazuhisa; Nishihata, Yasuo; Uosaki, Kohei*
RSC Advances (Internet), 3(35), p.15094 - 15101, 2013/09
Times Cited Count：9 Percentile：35.35(Chemistry, Multidisciplinary)Suzuki, Takeshi; Nakano, Masahiro; Okawa, Hiroshi; Terunuma, Akihiro; Kishimoto, Katsumi; Yano, Masaaki
JAERI-Tech 2005-018, 84 Pages, 2005/03
JAERI-Tech-2005-018.pdf:27.52MB
no abstracts in English
Nakano, Masahiro; Okawa, Hiroshi; Suzuki, Takeshi; Kishimoto, Katsumi; Terunuma, Akihiro; Yano, Masaaki
Dekomisshoningu Giho, (30), p.11 - 24, 2004/09
Japan Research Reactor No.2(JRR-2), heavy water moderated and cooled tank type research reactor with maximum thermal power of 10MW,was operated for over 36 years, and was permanently shut down in December, 1996. In 1997, decommissioning plan was submitted to the STA, and dismantling was begun. Decommissioning program of JRR-2 is divided into 4 phases. Phase 1, 2 had already been completely finished without any trouble. Furthermore, the phase 3 was also finished in February, 2004 as planned. On exposure of worker in phase 1, 2 and 3, it was achieved to control lower than the estimate. On exposure of worker in phase 1, 2 and 3, it was achieved to control lower than the estimate. Reactor will be removed in phase 4 by one piece removal technique. The reactor building is planned to use effectively as a hot experimental facilities after decommissioning. The decommissioning plan was changed that the reactor would be kept in safety storage.
Maeda, Seiichiro; Takashita, Hirofumi; Okawa, Tsuyoshi; Higuchi, Masashi*; Abe, Tomoyuki
JNC TN8400 2003-019, 185 Pages, 2003/08
JNC-TN8400-2003-019.pdf:11.78MB
We are studying on an in-core breeding concept as a candidate for a practical FBR fuel cycle system attainable in an early stage on the premise that sodium coolant and mixed oxide fuel should be adopted, since the technical issues with these combination are most advanced and common with the fuel cycle for a LWR-MOX system. An enhancement of fuel volume fraction using thick fuel pins enables the in-core breeding. The fuel material flow can be greatly lessened by minimizing amount of the blanket with the in-core breeding core. The low material flow leads to significant reduction of the fuel cycle cost. We investigated a 3500 MWth large-scale core adjusting several conditions presented in JNC's feasibility study program for a commercialized FBR system in this study. These were shown in this study that a discharged burnup averaged over the core and the blanket could reach approximately 130 GWd/t (core averaged about 150 GWd/t) within the maximum fast neutron fluence about 5
10
/cm
, that the small reactivity loss with burnup easily enabled long operation and that stable power distribution during operation significantly improved hydraulic property in this type core. We investigated measures to reduce sodium void reactivity, because core height enlargement to enhance neutron efficiency caused the increase of sodium void reactivity.We also investigated feasibility of a high breeding type core with low burnup considering a variety of FBR introducing scenarios and a trade-off correlation between breeding performance and burnup extension. The performance in this core design at core disruption accidents is not revealed enough. Further investigation should be made in detail to confirm that the in-core breeding concept could be accepted in a safety aspect.
Nakano, Masahiro; Arigane, Kenji; Okawa, Hiroshi; Suzuki, Takeshi; Kishimoto, Katsumi; Terunuma, Akihiro; Yano, Masaaki; Sakuraba, Naotoshi; Oba, Nagamitsu
JAERI-Tech 2003-072, 92 Pages, 2003/08
JAERI-Tech-2003-072.pdf:6.99MB
The decommissioning plan of the Japan Research reactor No2(JRR-2), decommissioning activities until the first half of phase-3, radioactive wastes and exposure dose of workers are described in this report. Since the first criticality in October 1960, JRR-2 had been operated about 36 years for various experiments. However, JRR-2 was permanent shutdown in December 1996 based on JAERI's long term plan, and the decommissioning of the JRR-2 was started in August 1997. Decommissioning of the JRR-2 was planed for 11 years from 1997 to 2007 and the program was divided into 4 phases. The decommissioning activities of the phase-1, phase-2 and the first half of phase-3 had already completed as planned in March 1998, February 2000, March 2002, respectively. The decommissioning activities of the later half of Phase-3 (dismantling of the reactor cooling systems) are carrying out at present time with planed 2002 and 2003 fiscal years.
Obara, Kenjiro; Kakudate, Satoshi; Oka, Kiyoshi; Furuya, Kazuyuki; *; Tada, Eisuke; Shibanuma, Kiyoshi; Koizumi, Koichi; Okawa, Yoshinao; Morita, Yosuke; et al.
JAERI-Tech 96-011, 111 Pages, 1996/03
no abstracts in English
Akutsu, Yoichi; Okawa, Yoshinao; Suzuki, Hideyuki; *; *; *; *
Nihon Kenchiku Gakkai Taikai Gakujutsu Koen Kogaishu, 0, p.1147 - 1148, 1996/00
no abstracts in English
Okawa, Yoshinao; Akutsu, Yoichi; Suzuki, Hideyuki; *; *; *; *
Nihon Kenchiku Gakkai Taikai Gakujutsu Koen Kogaishu, 0, p.1047 - 1048, 1995/00
no abstracts in English
Obara, Kenjiro; Kakudate, Satoshi; Oka, Kiyoshi; Furuya, Kazuyuki; *; Tada, Eisuke; Shibanuma, Kiyoshi; Okawa, Yoshinao; Morita, Yosuke; Yokoo, Noriko*; et al.
JAERI-Tech 94-003, 73 Pages, 1994/08
[This article is unavailable to download the full text due to various reasons.]
Akutsu, Yoichi; Okawa, Yoshinao; Suzuki, Hideyuki; *; *; *
Nihon Kenchiku Gakkai Taikai Gakujutsu Koen Kogaishu, 0, p.1727 - 1728, 1994/00
no abstracts in English
Okawa, Yoshinao; Akutsu, Yoichi; Suzuki, Hideyuki; *; *; *; *
Nihon Kenchiku Gakkai Taikai Gakujutsu Koen Kogaishu, 0, p.1725 - 1726, 1994/00
no abstracts in English
Yoshida, Hiroshi; ; Okawa, Yoshinao; Asahara, Masaharu*; Yokogawa, Nobuhisa*; Tanemori, Nozomu*; Horikiri, Hitoshi*
JAERI-M 93-136, 117 Pages, 1993/07
no abstracts in English
Yoshida, Hiroshi; ; Okawa, Yoshinao; Tanemori, Nozomu*; Horikiri, Hitoshi*
JAERI-M 93-107, 112 Pages, 1993/05
no abstracts in English
Katagiri, Masaki; Kishimoto, Maki; Ito, Hirokuni; ; Fukushima, Masao; Okawa, Hiroshi;
Nuclear Instruments and Methods in Physics Research A, 327, p.463 - 468, 1993/00
Times Cited Count：3 Percentile：43.05(Instruments & Instrumentation)no abstracts in English
Katagiri, Masaki; Kishimoto, Maki; Ito, Hirokuni; Fukushima, Masao; Okawa, Hiroshi; ; ; Tobita, Tsutomu
Journal of Nuclear Science and Technology, 29(10), p.957 - 965, 1992/10
no abstracts in English
Shibanuma, Kiyoshi; *; *; *; Okawa, Yoshinao; *; Tada, Eisuke; Koizumi, Koichi; *; Nishio, Satoshi; et al.
JAERI-M 91-080, 357 Pages, 1991/06
no abstracts in English
Yoshida, Hiroshi; Enoeda, Mikio; *; Tanaka, Shigeru; Okawa, Yoshinao; Nagakura, Masaaki*; *; *
JAERI-M 90-233, 38 Pages, 1991/01
no abstracts in English
; ; ; ;
IEEE Transactions on Nuclear Science, NS-32, p.1209 - 1213, 1985/00
no abstracts in English
; ; ;
JAERI-M 84-108, 38 Pages, 1984/06
no abstracts in English
Karube, Koji; Aita, Tsuyoshi; Okawa, Toshikatsu
no journal, ,
no abstracts in English
