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Journal Articles

Current status and future plan of research and development on partitioning and transmutation technology in Japan

Oigawa, Hiroyuki; Minato, Kazuo; Morita, Yasuji; Kimura, Takaumi; Arai, Yasuo; Tsujimoto, Kazufumi; Nishihara, Kenji

Proceedings of 11th OECD/NEA Information Exchange Meeting on Actinide and Fission Product Partitioning and Transmutation (Internet), p.123 - 132, 2010/11

After the first check and review on the partitioning and transmutation (PT) technology by the Japan Atomic Energy Commission (JAEC) in 2000, significant progress was made in respective research areas of the partitioning, fuel fabrication, transmutation and fuel recycling in Japan. The second check and review on the PT technology was made by the JAEC in 2008-2009. The final report issued in April, 2009, mentions that the significance of the PT technology is in three points: reduction of the potential hazard, mitigation of the requirement for geological repository site, and enhancement of the options in the design of the whole system of waste disposal. The current technology levels of the PT for both FBR and ADS were evaluated. The PT technology in general is still in the basic research because of the lack of experimental data for minor actinides (MA). It was, therefore, strongly recommended to accumulate the experimental data for MA as a common basis for both FBR and ADS.

Journal Articles

Recent research and development on partitioning and transmutation by "double-strata fuel cycle concept" in JAEA

Minato, Kazuo; Morita, Yasuji; Kimura, Takaumi; Oigawa, Hiroyuki; Arai, Yasuo; Sasa, Toshinobu

Proceedings of International Conference on Advanced Nuclear Fuel Cycle; Sustainable Options & Industrial Perspectives (Global 2009) (CD-ROM), p.504 - 512, 2009/09

In JAEA, research and development (R&D) activities for partitioning and transmutation (P&T) have been promoted under the OMEGA program for 20 years. The first review of these activities was performed by the Japan Atomic Energy Commission in 2000. In accordance with the results of the review, JAEA is conducting the R&D on the P&T technology based on the "Double-strata Fuel Cycle concept" as well as that based on the commercial fast reactor cycle. The "Double-strata Fuel Cycle concept" consists of the partitioning process of the high-level waste (HLW) and the dedicated transmutation cycle using the accelerator-driven system (ADS) with the minor actinide (MA) nitride fuel. The benefit of P&T technology in terms of the waste management is also discussed. The second check and review on P&T was made in September 2008 - March 2009. The review results and recommendations for future R&D are introduced.

Journal Articles

Fuel performance evaluation of rock-like oxide fuels

Shirasu, Noriko; Kuramoto, Kenichi; Nakano, Yoshihiro; Yamashita, Toshiyuki; Kimura, Yasuhiko; Nihei, Yasuo; Ogawa, Toru

Journal of Nuclear Materials, 376(1), p.88 - 97, 2008/05

 Times Cited Count:13 Percentile:64.66(Materials Science, Multidisciplinary)

The concept of the rock-like oxide (ROX) fuel has been developed for the annihilation of excess plutonium in light water reactors. Irradiation tests and post-irradiation examinations were carried out on candidate ROX fuels. The ternary fuel of YSZ-spinel-corundum system, the single-phase fuels of YSZ, the particle dispersed fuels of YSZ in spinel or corundum matrix, and the blended fuels of YSZ and spinel or corundum matrix were fabricated and submitted to irradiation tests. The fuels containing spinel showed chemical instabilities with the vaporization of MgO component, which caused fuel restructuring. The swelling behavior was improved with the particle-dispersed fuels. However, the particle-dispersed fuels showed higher fractional gas release (FGR) than blended type fuels. The FGR of YSZ single-phase fuels were comparable to what would be expected for UO$$_{2}$$ fuels. The YSZ single-phase fuel showed the best irradiation performance among the ROX fuels investigated.

Journal Articles

Development of commercial variety of osteospermum by a stepwise mutagenesis by ion beam irradiation

Iizuka, Masahide*; Kimura, Yasuo*; Hase, Yoshihiro; Tanaka, Atsushi

JAEA-Review 2007-060, JAEA Takasaki Annual Report 2006, P. 71, 2008/03

no abstracts in English

Journal Articles

Mutation induction from osteospermum leaf cultures with ion beam irradiation

Iizuka, Masahide*; Kimura, Yasuo*; Hase, Yoshihiro; Tanaka, Atsushi

JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 81, 2007/02

no abstracts in English

Journal Articles

Present status and future perspective of research and development on partitioning and transmutation technology at JAERI

Oigawa, Hiroyuki; Minato, Kazuo; Kimura, Takaumi; Morita, Yasuji; Arai, Yasuo; Nakayama, Shinichi; Nishihara, Kenji

Proceedings of International Conference on Nuclear Energy System for Future Generation and Global Sustainability (GLOBAL 2005) (CD-ROM), 6 Pages, 2005/10

JAERI is engaging in the R&D on the Double-strata Fuel Cycle concept in accordance with the results of the check and review on the Partitioning and Transmutation (PT) technology made by the Atomic Energy Commission of Japan in 2000. As for the partitioning process, after the establishment of the "4-group Partitioning Process Concept", an innovative concept called ARTIST is also being studied. As for the fuel technology, minor actinide nitrides such as NpN and AmN were synthesized and their material properties have been measured. To reprocess the irradiated fuel, the pyrochemical process has been studied. The R&D of the accelerator-driven transmutation system are in progress for an accelerator, lead-bismuth, and a subcritical reactor. In addition, JAERI has started the high-intensity proton accelerator project (J-PARC), which includes the Transmutation Experimental Facility (TEF) as the Phase-II. The impact of PT technology on the backend of the nuclear energy utilization is also being discussed.

JAEA Reports

Status and future plan of research and development on partitioning and transmutation technology for long-lived nuclides in JAERI

Oigawa, Hiroyuki; Nishihara, Kenji; Minato, Kazuo; Kimura, Takaumi; Arai, Yasuo; Morita, Yasuji; Nakayama, Shinichi; Katakura, Junichi

JAERI-Review 2005-043, 193 Pages, 2005/09

JAERI-Review-2005-043.pdf:16.13MB

JAERI has been conducting research and development on partitioning and transmutation (P&T) technology for long-lived nuclides to develop the double-strata fuel cycle concept, in accordance with the Atomic Energy Commission's "Research and Development of Technologies for Partitioning and Transmutation of Long-lived Nuclides - Status and Evaluation Report" issued in 2000. The double-strata fuel cycle concept consists of four major processes: partitioning, fuel fabrication, transmutation, and fuel processing. The five-year achievement and future perspectives for the technology on these processes are presented in this report. It also provides an analytical study on impacts of introducing P&T technology on waste management, and on deployment of P&T for the future nuclear energy system.

JAEA Reports

Post irradiation examination of (U,Pu)C and (U,Pu)N fuels for fast reactors; Destructive examination result of the fuel pins (Joint research)

Iwai, Takashi; Nakajima, Kunihisa; Kikuchi, Hironobu; Nagashima, Hisao; Kimura, Yasuhiko; Matsui, Hiroki; Arai, Yasuo

JAERI-Research 2002-038, 69 Pages, 2003/01

JAERI-Research-2002-038.pdf:12.46MB

Uranium-plutonium mixed carbide and nitiride fuel pins were fabricated in JAERI and irradiated at fast test rector JOYO based on the JAERI-JNC joint research program. The results of non-destructive and destructive post irradiation examinations cariied out at JNC were reported elsewhere. This report summarizes the results of destructive post irradiation examinations of (U,Pu)C and (U,Pu)N fuel pins carried out at JAERI.

JAEA Reports

Post-irradiation examinations of uranium-plutonium mixed nitride fuel irradiated in JMTR; 89F-3A capsule

Iwai, Takashi; Nakajima, Kunihisa; Kikuchi, Hironobu; Kimura, Yasuhiko; Nagashima, Hisao; Sekita, Noriaki; Arai, Yasuo

JAERI-Research 2000-010, p.110 - 0, 2000/03

JAERI-Research-2000-010.pdf:20.61MB

no abstracts in English

JAEA Reports

Behavior of actinides and fission products in mixed nitride fuels irradiated in JMTR; 88F-5A capsule

Iwai, Takashi; Nakajima, Kunihisa; Kikuchi, Hironobu; Kimura, Yasuhiko; Kanaitsuka, Fumio; Sekita, Noriaki; Arai, Yasuo

JAERI-Research 2000-009, p.36 - 0, 2000/03

JAERI-Research-2000-009.pdf:6.16MB

no abstracts in English

JAEA Reports

Behavior of plutonium and fission products in thermally stabilized mixed carbide fuel irradiated in JMTR

Iwai, Takashi; Arai, Yasuo; Nakajima, Kunihisa; Kimura, Yasuhiko; ;

JAERI-Research 96-066, 26 Pages, 1996/12

JAERI-Research-96-066.pdf:1.91MB

no abstracts in English

JAEA Reports

Behavior of plutonium and fission products in mixed uranium-plutonium carbide fuels irradiated in JMTR (84F-12A capsule)

Iwai, Takashi; Arai, Yasuo; Nakajima, Kunihisa; Kimura, Yasuhiko; ;

JAERI-Research 96-065, 47 Pages, 1996/12

JAERI-Research-96-065.pdf:4.1MB

no abstracts in English

JAEA Reports

Experience and projects for treatment, conditioning and strage of all radioactive wastes from Tokai Reprocessing Plant

Matsumoto, Kenichi*; Miyahara, Kenji; ; Asazuma, Shinichiro; Fukushima, Isao; Shoji, Kenji; Nojima, Yasuo; Kimura; Ikeda; Shibuya, Jun*; et al.

PNC TN8440 87-194, 82 Pages, 1987/08

PNC-TN8440-87-194.pdf:4.92MB

no abstracts in English

Journal Articles

The JT-60 central control system

; Kimura, Toyoaki; Yonekawa, Izuru; Kurihara, Kenichi; ; ; Hosogane, Nobuyuki; Yoshino, Ryuji; Ninomiya, Hiromasa; Kawamata, Yoichi; et al.

Fusion Engineering and Design, 5, p.69 - 84, 1987/00

 Times Cited Count:9 Percentile:66.68(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Oral presentation

Performance of a new signal processing system for a detector array

Kimura, Atsushi; Koizumi, Mitsuo; Toh, Yosuke; Oshima, Masumi; Mizumoto, Motoharu; Goto, Jun*; Arai, Yasuo*; Sagara, Masahiro*; Iri, Shinichi*; Kobayashi, Hirotsugu*; et al.

no journal, , 

To measure neutron cross-section data of minor actinides, we construct a Ge-spectrometer utilizing multiple $$gamma$$-ray detection method. This spectrometer consists of 30 Ge crystals (40 detector outputs) and 128 BGO anti-Compton shields. Generally, a data acquisition system for such a big Ge spectrometer consists of many NIM modules; it requires large space and huge cost. To overcome these problems, we developed a new data acquisition system with digital signal processing techniques. We reported the conceptual design (and cost) in NSS 2004. In this NSS 2005, we report basic performance of this system (energy resolution, dead time and so on) and results of experiments with the Ge-spectrometer. We measured the energy resolution with a Eurisys clover detector, which is one component of the Ge-spectrometer. Obtained FWHMs (2.5 - 2.8 keV at 1.33 MeV) show good performances as normal MCA even with short shaping time and much higher channel density. The dead time of this system is only 3.2 micro sec per event.

Oral presentation

Development of garden varieties using ion beam-induced mutagenesis

Iizuka, Masahide*; Kimura, Yasuo*; Hase, Yoshihiro; Tanaka, Atsushi

no journal, , 

no abstracts in English

Oral presentation

Induction of mutation in Osteosperumum by ion beam irradiation

Iizuka, Masahide*; Kimura, Yasuo*; Hase, Yoshihiro; Tanaka, Atsushi

no journal, , 

no abstracts in English

Oral presentation

Mutation induction in osteospermum by ion beam irradiation

Iizuka, Masahide*; Kimura, Yasuo*; Hase, Yoshihiro; Tanaka, Atsushi

no journal, , 

no abstracts in English

Oral presentation

Development of commercial varieties of osteospermum by an step-by-step mutagenesis approach with ion beam irradiation

Iizuka, Masahide*; Kimura, Yasuo*; Hase, Yoshihiro; Tanaka, Atsushi

no journal, , 

no abstracts in English

24 (Records 1-20 displayed on this page)