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JAEA Reports

Interim activity status report of "the group for investigation of reasonable safety assurance based on graded approach" (from September, 2019 to September, 2020)

Yonomoto, Taisuke; Nakashima, Hiroshi*; Sono, Hiroki; Kishimoto, Katsumi; Izawa, Kazuhiko; Kinase, Masami; Osa, Akihiko; Ogawa, Kazuhiko; Horiguchi, Hironori; Inoi, Hiroyuki; et al.

JAEA-Review 2020-056, 51 Pages, 2021/03

JAEA-Review-2020-056.pdf:3.26MB

A group named as "The group for investigation of reasonable safety assurance based on graded approach", which consists of about 10 staffs from Sector of Nuclear Science Research, Safety and Nuclear Security Administration Department, departments for management of nuclear facility, Sector of Nuclear Safety Research and Emergency Preparedness, aims to realize effective graded approach (GA) about management of facilities and regulatory compliance of JAEA. The group started its activities in September, 2019 and has had discussions through 10 meetings and email communications. In the meetings, basic ideas of GA, status of compliance with new regulatory standards at each facility, new inspection system, etc were discussed, while individual investigation at each facility were shared among the members. This report is compiled with expectation that it will help promote rational and effective safety management based on GA by sharing contents of the activity widely inside and outside JAEA.

Journal Articles

Current status of research and development at Japan Atomic Energy Agency

Oigawa, Hiroyuki; Wakimoto, Shuichi

Denki Hyoron, 103(2), p.50 - 65, 2018/02

no abstracts in English

Journal Articles

Current status of research and development at Japan Atomic Energy Agency

Oigawa, Hiroyuki; Wakimoto, Shuichi

Denki Hyoron, 102(2), p.46 - 61, 2017/02

no abstracts in English

Journal Articles

Expectation to science and technology in Japan; Toward solution of challenges in nuclear utilization and its innovative application

Oigawa, Hiroyuki

Enerugi Rebyu, 36(10), p.10 - 11, 2016/10

Japan Atomic Energy Agency is conducting wide range of research and development on nuclear power such as those for response to the accident at the Fukushima Daiichi Nuclear Power Plant, improvement of nuclear power safety, establishment of fast reactor technology and nuclear fuel cycle, countermeasure to back-end of nuclear power, basic and fundamental research, and human resource development, in order to solve various problems concerning nuclear power and to explore possibility of more sophisticated utilization of nuclear technology. Hereafter, we would like to contribute to the creation of innovation originated in Japan by enhancing collaboration with other national research and development organizations, universities and private companies and by maximizing outcomes of research and development in Japan.

Journal Articles

Partitioning and transmutation by ADS

Oigawa, Hiroyuki

Hoshasei Haikibutsu Genyoka, Yugai Teigen No Gijutsu Kaihatsu, Kakushu Bunri, Tenkan; NSA/Commentaries, No.22, p.38 - 50, 2016/03

An Accelerator-Driven System (ADS) is a hybrid nuclear system coupling a subcritical reactor consisting of minor actinide fuels with a spallation neutron source driven by a high-power proton accelerator, aiming at effective transmutation of MA contained in high-level radioactive wastes. An ADS with thermal power of 800MW can transmute MA produced in 10 light water reactors with electric power of 1GW. To realize ADS, we should solve various technical challenges such as a high-power accelerator, a spallation target, a subcritical reactor, recycle technology of MA fuel, and so on. JAEA is conducting research and development to solve these technical challenges with making use of international collaborations, and planning a new experimental program using J-PARC.

Journal Articles

Research and development on nuclear transmutation by Accelerator Driven System (ADS)

Oigawa, Hiroyuki

Genshiryoku Nenkan 2016, p.133 - 135, 2015/10

An Accelerator-Driven System (ADS) is a hybrid nuclear system coupling a subcritical reactor with a spallation neutron source driven by a high-power proton accelerator, aiming at effective transmutation of minor actinides contained in high-level radioactive wastes. JAEA is conducting a research and development program on ADS, and planning to construct the Transmutation Experimental Facility at J-PARC as a part of the program.

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

J-PARC transmutation experimental facility programme

Sasa, Toshinobu; Takei, Hayanori; Saito, Shigeru; Obayashi, Hironari; Nishihara, Kenji; Sugawara, Takanori; Iwamoto, Hiroki; Yamaguchi, Kazushi; Tsujimoto, Kazufumi; Oigawa, Hiroyuki

NEA/CSNI/R(2015)2 (Internet), p.85 - 91, 2015/06

Nuclear transmutation got much interested as an effective option of nuclear waste management. Japan Atomic Energy Agency (JAEA) proposes the transmutation of minor actinides (MA) by accelerator-driven system (ADS) using lead-bismuth alloy (Pb-Bi). To obtain the data for ADS design, JAEA plans to build a Transmutation Experimental Facility (TEF) in the J-PARC project. TEF consists of two buildings, an ADS target test facility (TEF-T) with 400MeV-250kW Pb-Bi target, and a Transmutation Physics Experimental Facility (TEF-P), which set up a fast critical assembly driven by low power proton beam with MA fuel. In TEF-T, irradiation test for materials, and engineering tests for Pb-Bi target operation will be performed. Various research plans such as nuclear data measurements have been proposed and layout of the experimental hall are underway. In the presentation, roadmap to establish the ADS transmutor and latest design activities for TEF construction will be summarized.

Journal Articles

Review of ADS and P&T Programme in Japan

Oigawa, Hiroyuki

NEA/NSC/R(2015)2 (Internet), p.37 - 43, 2015/06

The Ministry of Education, Culture, Sports, Science, and Technology of Japan launched a Working Party to review research and development (R&D) on Partitioning and Transmutation (P&T) technology using an Accelerator Driven System (ADS), and issued an interim report in November, 2013. Although P&T concept with ADS, called Double-strata Fuel Cycle, had been regarded as a backup option of that with FBR, the Working Party recommended to promote the R&D phase of this technology to a principle demonstration stage. The Working Party recommended to facilitate the R&D toward the Transmutation Experimental Facility of J-PARC, though further technical evaluation was requested to start the construction. The Working Party also recommended to consistently facilitate R&D on partitioning process, dedicated transmutation fuel and its cycle. A consolidated roadmap toward the realization of this technology was also discussed

JAEA Reports

Conceptual study of transmutation experimental facility, 5; Investigation of MA fuel handling

Sugawara, Takanori; Nishihara, Kenji; Sasa, Toshinobu; Tsujimoto, Kazufumi; Tazawa, Yujiro; Oigawa, Hiroyuki

JAEA-Technology 2014-044, 59 Pages, 2015/03

JAEA-Technology-2014-044.pdf:14.46MB

Transmutation Physics Experimental Facility (TEF-P) planned in the J-PARC is a critical assembly with low thermal output and it will treat large amount of highly-radioactive minor actinide (MA) fuels in the experiments. Handling of the MA fuels in each stage of storage, transport and loading/unloading to the core was conceptually investigated, then, criticality, dose and cooling performance were assessed. For the criticality, it was shown that the effective multiplication factors in each step, storage, transport and loading, were sufficiently lower than 1.0. For the dose, the dose for workers will be reduced by installing remote handling devices to treat the MA fuels. For the cooling performance, it was found that the temperature of the core would be kept low in the normal operation. On the other hand, in the case which the air conditioning or the blower for the core stopped for long period, it was shown that there would be a possibility of the MA fuel failure.

Journal Articles

Turn the nuclear backend into research frontier!

Oigawa, Hiroyuki

Nihon Genshiryoku Gakkai-Shi ATOMO$$Sigma$$, 57(1), p.4 - 5, 2015/01

Placing the nuclear backend as the most important issue of research and development of nuclear power, it is proposed to invest research and development resource to this issue in a concentrated manner as the Backend Frontier Program. In the field of the high-level waste (HLW), three main activities are proposed: the partitioning technology to be added to the reprocessing, the transmutation technology for long-lived nuclides, and the disposal technology for newly-produced wastes from these processes. In the field of the low-level waste (LLW) produced by operation and decommissioning of nuclear facilities, three main activities are proposed: the decommissioning technology to reduce the amount of the radioactive waste, the fabrication technology for various wastes, and the disposal technology for LLW. It is important to figure out the scheme by which safety can be secured with the most reasonable way by consolidating the activities in these two fields.

Journal Articles

Transmutation scenarios after closing nuclear power plants

Nishihara, Kenji; Tsujimoto, Kazufumi; Oigawa, Hiroyuki

Nuclear Back-end and Transmutation Technology for Waste Disposal, p.207 - 231, 2015/00

With consideration of the phase-out option from NP utilization in Japan, an ADS for Pu transmutation is designed and scenario analysis is performed. The ADS is designed based on the existing ADS design for MA transmutation, and the 6-batch ADS is selected as a reference design for scenario analysis. In the scenario analysis, once-through scenario of LWR spent fuel is referred as a conventional scenario with a LWR-MOX utilization scenario. As the transmutation scenario, three cases of transmuters that are only-FR, only-ADS and both-FR+ADS are analyzed. The numbers of necessary transmuters are obtained as 15 to 32, and, the necessary period for transmutation as 180 to 240 years. Benefit on repository by reduction of Pu and MA is reduction of repository area by a factor of five and of decay time of toxicity by a magnitude of order. The FR+ADS scenario is considered to be a modest solution, though the ADS scenario is preferable if rapid transmutation is required.

Journal Articles

Studies on accelerator-driven system in JAEA

Sasa, Toshinobu; Oigawa, Hiroyuki

Plasma and Fusion Research (Internet), 9(Sp.3), p.4401113_1 - 4401113_5, 2014/10

The accelerator driver system concept proposed by JAEA and status of the research and development are introduced with the effects of nuclear transmutation technology. The role and function of the J-PARC Transmutation Experimental Facility which is indispensable to realize an accelerator driver systems, and the possibility of the multipurpose use of spallation neutrons is also explained.

Journal Articles

Research and development activities for transmutation physics experimental facility in J-PARC

Sugawara, Takanori; Iwamoto, Hiroki; Nishihara, Kenji; Tsujimoto, Kazufumi; Sasa, Toshinobu; Oigawa, Hiroyuki

Proceedings of International Conference on the Physics of Reactors; The Role of Reactor Physics toward a Sustainable Future (PHYSOR 2014) (CD-ROM), 8 Pages, 2014/09

The Japan Atomic Energy Agency (JAEA) has the plan to construct Transmutation Physic Experimental Facility (TEF-P) under a framework of J-PARC (Japan Proton Accelerator Research Complex) project. TEF-P is a critical assembly which can load Minor Actinide (MA) fuels to perform reactor physics experiments for transmutation systems such as Accelerator-Driven System (ADS) or Fast Reactor (FR). The facility can also use proton beam from the J-PARC accelerator to investigate the controllability of ADS. Cur-rent status and activities for TEF-P are described.

Journal Articles

Challenge to nuclear transmutation technology for radioactive wastes; Status of the technology using accelerator driven system

Oigawa, Hiroyuki

CROSS T&T, (47), p.48 - 53, 2014/06

JAEA is conducting research and development on an Accelerator Driven System (ADS), aiming at effective transmutation of minor actinides which keep long-lasting radio toxicity in high-level radioactive wastes. The ADS is an innovative nuclear system combining a superconducting proton accelerator, a spallation target and a subcritical core. To tackle technical challenges on materials and reactor physics toward realization of ADS, JAEA is planning to build Transmutation Experimental Facility as the Phase-2 program of J-PARC. Moreover, JAEA is considering the collaboration with the MYRRHA project proposed by Belgian Nuclear Research Center.

Journal Articles

Scenario study for closing nuclear power generation

Nishihara, Kenji; Tsujimoto, Kazufumi; Oigawa, Hiroyuki

NEA/NSC/DOC(2013)3, p.77 - 85, 2013/04

At the end of the nuclear power generation in the future, there will be considerable amount of nuclear material that will be no longer burnable in the commercial nuclear power reactors. In the transmutation strategy, Pu has to be transmuted prior to MA because of its amount and usability as the nuclear weapon. For the country without the FBR technology, Pu must be transmuted in the LWR dedicated for the transmutation in forms of the MOX fuel or the ROX fuel. If the transmutation systems such as fast reactor or accelerator-driven system are introduced in the nuclear fuel cycle, very small amount of Pu and MA are contained in the high-level waste. In the present study, above mentioned transmutation methods were investigated quantitatively in terms of necessary number of transmutation systems and period after closing the nuclear power with the use of the analysis code for nuclear material flow. Moreover, the comparison of repository were made along the transmutation scenarios.

Journal Articles

Progress review of research and development on accelerator driven system in JAEA

Oigawa, Hiroyuki; Tsujimoto, Kazufumi; Sasa, Toshinobu; Kurata, Yuji; Takei, Hayanori; Saito, Shigeru; Nishihara, Kenji; Obayashi, Hironari; Sugawara, Takanori; Iwamoto, Hiroki

KURRI-KR(CD)-40 (CD-ROM), p.16 - 30, 2013/00

In JAEA, research and development on an Accelerator-Driven System (ADS) have been conducted in order to transmute minor actinides (MA) contained in high-level radioactive wastes. One unit of ADS with thermal power of 800 MW can transmute MA generated in 10 units of light water reactors with electric power of 1 GW. In JAEA, we are studying variety of technical areas such as a superconducting proton accelerator, a spallation target including a beam window and a subcritical core including neutronics design and safety assessment. Moreover, construction of the Transmutation Experimental Facility is being planned as a phase-2 program of the J-PARC project to perform basic experiments for transmutation technology.

Journal Articles

Present status and prospect of transmutation technology for high-level radioactive waste

Oigawa, Hiroyuki

Radioisotopes, 61(11), p.571 - 586, 2012/11

The transmutation technology is to transform minor actinides (MA) in high-level radioactive waste (HLW) to short-lived or stable nuclides by nuclear reactions. It makes it possible to reduce the potential radiological hazard of HLW and the area to dispose of it. The accelerator-driven system (ADS) is recognized as a dedicated tool to transmute MA, and variety of research and development activities for it are under way in the world. The research areas to be covered spread over wide range of scientific and technological fields on an accelerator, a spallation target, materials, nuclear reactor engineering, nuclear fuel. It is, therefore, of great importance to facilitate international collaboration. The Transmutation Experimental Facility of J-PARC is being proposed as one of possible centers of excellence.

Journal Articles

Technology to shorten the time period for detoxification of nuclear wastes from a hundred thousand years to several hundred years

Oigawa, Hiroyuki

Bokura No Enerugitte, Donaruno!?, p.148 - 175, 2012/10

By transmuting long-lived nuclides such as minor actinides (MA) contained in high-level radioactive wastes, there is a possibility to reduce the burden of nuclear waste disposal. Aiming at effective transmutation of MA, we are proposing an Accelerator-Driven System (ADS), where a subcritical core consisting of MA fuel is driven by a spallation neutron source coupled with a proton accelerator.

Journal Articles

Reduction of burden for waste disposal by accelerator-driven transmutation technology; Preparing for unforeseeable future by nuclear fuel cycle for back-end

Oigawa, Hiroyuki

Nihon Genshiryoku Gakkai-Shi ATOMO$$Sigma$$, 54(5), p.315 - 317, 2012/05

Accelerator Driven System (ADS) is an innovative nuclear system to transmute minor actinides. By coupling transmutation technology by ADS and partitioning technology, the burden for nuclear waste disposal is expected to be largely reduced. Under the present status where the future of nuclear fuel cycle is unforeseeable, it is desirable to proceed with the research and development of ADS which can flexibly harmonize well with various options in the future. The research and development of ADS should be promoted by international and interdisciplinary collaboration. In this context, Transmutation Experimental Facility under the J-PARC phase-2 project is expected to play an important role to lead worldwide activities to cope with radioactive wastes.

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