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Journal Articles

Material balance evaluation of pyroprocessing for minor actinide transmutation nitride fuel

Tateno, Haruka; Sato, Takumi; Tsubata, Yasuhiro; Hayashi, Hirokazu

Journal of Nuclear Science and Technology, 57(3), p.224 - 235, 2020/03

 Times Cited Count:0 Percentile:100(Nuclear Science & Technology)

Fuel cycle technology for the transmutation of long-lived minor actinides (MAs) using an accelerator-driven system has been developed using the double-strata fuel cycle concept. A mononitride solid solution of MAs and Pu diluted with ZrN is a prime fuel candidate for the accelerator-driven transmutation of MAs. Pyro-reprocessing is suitable for recycling the residual MAs in irradiated nitride fuel with high radiation doses and decay heat. Spent nitride fuel is anodically dissolved, and the actinides are recovered simultaneously into a liquid cadmium cathode via molten salt electrorefining. The process should be designed to achieve the target recovery yield of MAs and the acceptable impurity level of rare earths in the recovered material. We evaluated the material balance during the pyro-reprocessing of spent nitride fuel to gain important insight on the design process. We examined the effects of changing processing conditions on material flow and quantity of waste.

Journal Articles

High-energy nuclear data uncertainties propagated to MYRRHA safety parameters

Stankovskiy, A.*; Iwamoto, Hiroki; $c{C}$elik, Y.*; Van den Eynde, G.*

Annals of Nuclear Energy, 120, p.207 - 218, 2018/10

 Times Cited Count:5 Percentile:29.78(Nuclear Science & Technology)

Propagation of high-energy (above 20-MeV) nuclear data uncertainties on the safety related neutronic responses in accelerator driven systems has been assessed. The total core power and production of radionuclides contributing to radiation source terms were focused on. The article features a method based on the Monte Carlo sampling of random nuclear data files from the covariance matrices generated from the sets of reaction cross sections obtained with model calculations of high-energy particle interactions with matter or picked up from already existing nuclear data libraries. It has been demonstrated that nuclear data uncertainties do not need to be propagated through particle transport calculations to obtain uncertainties on the responses. This advantage allowed to investigate the convergence of the sample average to the best estimate. The number of random nuclear data file sets needed to obtain reliable uncertainty on the total core power is around 300 that results in the uncertainty of 14%. The uncertainties on the concentrations of nuclides most important for the safety assessment that are accumulated in lead-bismuth eutectic during irradiation, range from 5 to 60%. Concentrations of some nuclides exemplified by Tritium converge much slower than neutron multiplicities so that several thousands of samples are needed to ensure reliable uncertainty estimates.

Journal Articles

Present state of partitioning and transmutation of long-lived nuclides, 4; Transmutation system using accelerator driven system and technology maturity of partitioning and transmutation

Tsujimoto, Kazufumi; Arai, Yasuo; Minato, Kazuo

Nippon Genshiryoku Gakkai-Shi, 59(11), p.644 - 648, 2017/11

no abstracts in English

Journal Articles

Research and development in Japan Atomic Energy Agency

Tsujimoto, Kazufumi

Enerugi Rebyu, 37(9), p.11 - 14, 2017/08

no abstracts in English

Journal Articles

Current status and future plan of research and development on partitioning and transmutation based on double-strata concept in JAEA

Tsujimoto, Kazufumi; Sasa, Toshinobu; Maekawa, Fujio; Matsumura, Tatsuro; Hayashi, Hirokazu; Kurata, Masaki; Morita, Yasuji; Oigawa, Hiroyuki

Proceedings of 21st International Conference & Exhibition; Nuclear Fuel Cycle for a Low-Carbon Future (GLOBAL 2015) (USB Flash Drive), p.657 - 663, 2015/09

To continue the utilization of the nuclear fission energy, the management of the high-level radioactive waste is one of the most important issues to be solved. Partitioning and Transmutation technology of HLW is expected to be effective to mitigate the burden of the HLW disposal by reducing the radiological toxicity and heat generation. The Japan Atomic Energy Agency (JAEA) has been conducting the research and development on accelerator-driven subcritical system (ADS) as a dedicated system for the transmutation of long-lived radioactive nuclides. This paper overviews the recent progress and future R&D plan of the study on the ADS and related fuel cycle technology in JAEA.

Journal Articles

Design study of accelerator-driven system for minor actinide transmutation in JAEA

Tsujimoto, Kazufumi; Nishihara, Kenji; Takei, Hayanori; Sugawara, Takanori; Iwamoto, Hiroki; Sasa, Toshinobu

NEA/NSC/R(2015)2 (Internet), p.254 - 261, 2015/06

The Japan Atomic Energy Agency (JAEA) has been conducting the research and development (R&D) on accelerator-driven system (ADS) as a dedicated transmutation system of long-lived radioactive nuclides. The ADS proposed by JAEA is a lead-bismuth eutectic (LBE) cooled fast subcritical reactor with thermal output of 800 MW. For ADS to play important roles in the nuclear fuel cycle, several critical issues have to be resolved. The critical issue in the design of the ADS is the engineering feasibility of the beam window for the high power spallation target. Although a feasible concept of the beam window for the ADS was proposed in our previous work. To mitigate the thermal load of the beam window not only in the normal operation but also in the transient situations, the R&D for the mechanism of reactivity adjustment and the accelerator design have been performed in JAEA.

Journal Articles

Transmutation experimental facility for research and development of accelerator-driven system in JAEA

Tsujimoto, Kazufumi; Sasa, Toshinobu; Nishihara, Kenji; Sugawara, Takanori; Iwamoto, Hiroki; Takei, Hayanori

Proceedings of Joint IGORR 2014 & IAEA Technical Meeting (Internet), 10 Pages, 2014/00

Partitioning and Transmutation technology is expected to be effective to mitigate the burden of the HLW disposal. The Japan Atomic Energy Agency (JAEA) has been conducting the research and development (R&D) on accelerator-driven system (ADS) as a dedicated transmutation system of long-lived radioactive nuclides. For ADS to play important roles in the nuclear fuel cycle, several critical issues have to be resolved. To foster the R&D for most of above mentioned technical issues, JAEA plans to build the Transmutation Experimental Facility (TEF) which consists of two buildings: the Transmutation Physics Experimental Facility (TEF-P) and the ADS Target Test Facility (TEF-T). TEF-P is a zero-power critical facility which is operated with a low power proton beam to research the reactor physics and the controllability of ADS. Using this TEF-P facility, many experimental studies are planned.

Journal Articles

Design optimization of ADS plant proposed by JAERI

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:20 Percentile:17.49(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$$_{eff}$$) 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.

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

Conceptual study of transmutation experimental facility, 2; Study on ADS target test facility

Sasa, Toshinobu; Umeno, Makoto*; Mizubayashi, Hiroshi*; Mori, Keijiro*; Futakawa, Masatoshi; Saito, Shigeru; Kai, Tetsuya; Nakai, Kimikazu*; Zako, Akira*; Kasahara, Yoshiyuki*; et al.

JAERI-Tech 2005-021, 114 Pages, 2005/03

JAERI-Tech-2005-021.pdf:9.66MB

To perform the research and development for accelerator-driven system (ADS), Japan Atomic Energy Research Institute (JAERI) plans to build a Transmutation Experimental Facility under the JAERI-KEK joint J-PARC program. Transmutation Experimental Facility consists of two buildings, Transmutation Physics Experimental Facility to make reactor physics experiment with subcritical core, and ADS Target Test Facility for the preparation of irradiation database for various structural materials. In this report, purpose to build, experimental schedule, and design study of the ADS target test facility with drawer type spallation target are summarized.

Journal Articles

Shielding design of the 200kW Pb-Bi spallation target for the transmutation experimental facility

Sasa, Toshinobu; Oigawa, Hiroyuki; Tayama, Ryuichi*; Hayashi, Katsumi*

Journal of Nuclear Science and Technology, 41(Suppl.4), p.30 - 33, 2004/03

The construction of Transmutation Experimental Facility (TEF) is planned under the framework of Japan Proton Accelerator Research Complex (J-PARC) project. A liquid lead-bismuth (Pb-Bi) spallation target with beam power of 600MeV-200kW will be installed into the TEF. Analyses were performed to determine the effective thickness of biological shield for Pb-Bi target by using both MCNPX and ATRAS code system. Thickness of around 6m should be required to decrease the radiation level. The streaming analyses through the proton injection beam duct and the primary cooling circuit piping were also performed. The result of the beam duct streaming shows good agreement between the results of MCNPX and DUCT-III. The additional shield must be installed to suppress the activation of accelerator components. In the case of streaming through the primary cooling circuit piping, it is proved that the radiation level at the exit of the shield is allowable. The radiation level can be much more reduced by optimizing the bending position and length of the piping.

Journal Articles

A Neutronics and burnup analysis of the accelerator-driven transmutation system with different cross section libraries

Sasa, Toshinobu; Tsujimoto, Kazufumi; Kaneko, Kunio*; Takano, Hideki

Journal of Nuclear Science and Technology, 39(Suppl.2), p.1183 - 1186, 2002/08

no abstracts in English

JAEA Reports

Conceptual study of transmutation experimental facility, 3; Study on transmutation physics experiment facility

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

Journal Articles

Experiment for accelerator-driven transmutation

Oigawa, Hiroyuki

Nippon Butsuri Gakkai-Shi, 56(10), p.749 - 754, 2001/11

no abstracts in English

Journal Articles

Study of lead-bismuth technology at JAERI

Sasa, Toshinobu; Saito, Shigeru; Kikuchi, Kenji; Kurata, Yuji; Futakawa, Masatoshi

Transactions of the American Nuclear Society, 85, p.299 - 300, 2001/11

Study of liquid lead-bismuth (Pb-Bi) technology is performed at JAERI. Pb-Bi cooled ADS has favorite neutronic performances rather than that of sodium-cooled ADS. In order to develop an ADS, JAERI has proposed a transmutation experimental facility which consists of a 600 MeV-200 kW Pb-Bi spallation target and a fast critical assembly with a spallation target within a framework of the high intensity proton accelerator project. In the viewpoint of engineering application of Pb-Bi, there is a key technology, which should be proven before the construction of TEF. They are materials issues and handling techniques of flowing eutectic Pb-Bi. To control these technical issues, we proceed two experimental studies with the material corrosion test device and the liquid Pb-Bi loop.

Journal Articles

Code development for the design study of the OMEGA program accelerator-driven transmutation systems

Sasa, Toshinobu; Tsujimoto, Kazufumi; Takizuka, Takakazu; Takano, Hideki

Nuclear Instruments and Methods in Physics Research A, 463(3), p.495 - 504, 2001/05

 Times Cited Count:11 Percentile:35.4(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Journal Articles

Review of research and development of accelerator-driven system in Japan for transmutation of long-lived nuclides

Mukaiyama, Takehiko; Takizuka, Takakazu; Mizumoto, Motoharu; Ikeda, Yujiro; Ogawa, Toru; Hasegawa, Akira; Takada, Hiroshi; Takano, Hideki

Progress in Nuclear Energy, 38(1-2), p.107 - 134, 2001/02

 Times Cited Count:55 Percentile:3.56(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Transmutation of long-lived radioactive waste based on double-strata concept

Takano, Hideki; Nishihara, Kenji; Tsujimoto, Kazufumi; Sasa, Toshinobu; Oigawa, Hiroyuki; Takizuka, Takakazu

Progress in Nuclear Energy, 37(1-4), p.371 - 376, 2000/12

 Times Cited Count:15 Percentile:29.04(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Dedicated accelerator-driven system for nuclear waste transmutation

Takizuka, Takakazu; Tsujimoto, Kazufumi; Sasa, Toshinobu; Takano, Hideki

Proceedings of the 3rd International Conference on Accelerator Driven Transmutation Technologies and Applications (CD-ROM), 12 Pages, 1999/06

no abstracts in English

48 (Records 1-20 displayed on this page)