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Journal Articles

Japan-U.S. cooperation in the development of next-generation fast reactors

Sagayama, Yutaka

Enerugi Rebyu, 42(7), p.38 - 42, 2022/06

An overview of the world's past developments in fast reactor development and the history of Japan-U.S. cooperation in this area, as well as an explanation of the possibilities and expectations for future Japan-U.S. cooperation.

Journal Articles

Effective use of uranium resources; Communicate the power of a closed cycle

Sagayama, Yutaka; Sawada, Tetsuo*; Tanaka, Harukuni*

Enerugi Foramu, (807), p.18 - 22, 2022/03

Discussing the necessity of the nuclear fuel cycle, its future, and issues (costs, pros and cons of the LWR cycle, etc.). The trend toward carbon neutrality will lead to a rush to build nuclear (light water reactor) power plants in many countries. As a result, the price of natural uranium is expected to skyrocket, increasing the need for fast reactor cycle development. It is essential to present to the world the concept of commercialization of fast reactors that combine high safety and economic efficiency, and to proceed with development steadily in order to realize it promptly, without dissipating the technologies for design, construction, operation, and maintenance of fast reactors that Japanese industry and JAEA have accumulated through the development of MONJU and other projects.

Journal Articles

Expectations for the GIF in its 20th year

Sagayama, Yutaka

Enerugi Rebyu, 41(8), P. 42, 2021/07

GIF was launched in 2001 to develop of GEN-4 reactors through international cooperation. The Policy Group chair rotates among the US, France, and Japan, and Hideki Kamide, Advisor to MEXT of the JAEA, is currently the Chair. The development goals and reactor concept have been summarized as follows, Establishment of the development goals of economic, security, sustainability and proliferation resistance. Selection of reactor types of GFR, SCWR, SFR, VHTR, LFR and MSR. The major achievement is establishment of the safety design criterion, which will become an international standard for SFR and has been developed under the leadership of Japan. In the future, it is important to establish a new mechanism in the demonstration stage and to develop design standards and criteria for maintenance and servicing for international standards for GEN-4 reactors.

Journal Articles

Present status and prospects of fast reactor development

Sagayama, Yutaka

Nihon Genshiryoku Gakkai-Shi ATOMO$$Sigma$$, 61(1), p.22 - 23, 2019/01

In this article, (1) significance of the development of fast reactor (Effective use of Uranium & Reduction of environmental burden) which is being conducted under international collaboration such as Generation IV International Forum, (2) past activity & future direction on the development of fast reactor in Japan and (3) those in the foreign countries including French ASTRID reactor development. Taking this situation into consideration, challenge to realize the target on future nuclear system, such as appropriate combination with renewable energies, is proposed.

Journal Articles

The Development status of Generation IV reactor systems, 1; Overview

Sagayama, Yutaka; Ando, Masato

Nihon Genshiryoku Gakkai-Shi ATOMO$$Sigma$$, 60(3), p.162 - 167, 2018/03

The Generation IV international Forum (GIF) has led international collaborative efforts to develop six next generation nuclear energy systems, such as Sodium-cooled Fast Reactor (SFR), Lead-cooled Fast Reactor (LFR), Gas-cooled Fast Reactor (GFR), Molten Salt Reactor (MSR), Supercritical Water-cooled Reactor (SCWR), and Very High Temperature Reactor (VHTR), which have superior characteristics for the Safety and Reliability, Economics, Sustainability, Proliferation Resistance and Physical Protection. Some systems are already in the Demonstration Phase and the commercialization of the system in 2030s, which is the target of GIF, comes into sight.

Journal Articles

Current status and future view of the fast reactor cycle technology development in Japan

Sagayama, Yutaka

Proceedings of International Conference on Fast Reactors and Related Fuel Cycles; Next Generation Nuclear Systems for Sustainable Development (FR-17) (USB Flash Drive), 8 Pages, 2017/06

The "Fourth Strategic Energy Plan" of Japan was approved by the Cabinet in April 2014. It states that nuclear energy is an important base-load power source as a low carbon and quasi-domestic source even after the Fukushima accident, and Japan promotes nuclear fuel cycle in terms of the efficient use of resources and volume reduction and mitigation of degree of harmfulness of HLW and carries out fast reactor (FR) cycle R&D for the commercialization, taking advantage of international cooperation. JAEA is conducting several FR cycle R&D primarily focusing on waste reduction and FR safety enhancement utilizing bilateral and multilateral cooperation (ASTRID program, GIF, etc.). JAEA applied for change of reactor installation license for experimental FR Joyo's restart in around 2020 under the new regulatory requirements in March 2017. Meanwhile, the Council on FR Development was established in September 2016 to discuss and prepare a draft paper on policy for FR development. Based on the result, the Inter-Ministerial Council for Nuclear Power decided the new policy and to develop a strategic roadmap by 2018 for realizing the policy. It also decided that Prototype FBR Monju will be decommissioned.

Journal Articles

Safety design approach for a large-scale Japan Sodium-cooled Fast Reactor (JSFR)

Kotake, Shoji*; Yamano, Hidemasa; Sagayama, Yutaka

Fusion Science and Technology, 61(1T), p.137 - 143, 2012/01

 Times Cited Count:1 Percentile:11.11(Nuclear Science & Technology)

The present paper describes safety goals and principles for Generation IV energy systems, with emphasis on prevention and mitigation against severe accidents in the safety design corresponding to Level 4 of the defense-indepth architecture. Consistent with them, a deterministic safety design approach has been applied to the Japan Sodium-cooled Fast Reactor (JSFR) with the complimentary use of probabilistic approach. The JSFR safety design principle has also been developed with safety design features corresponding to essential safety functions, such as reactor shutdown, decay heat removal and containment. Design principle against chemical activity of sodium is also discussed both on the isolation from the reactor core safety and the contribution to the plant reliability.

Journal Articles

Long term nuclear energy development scenario for energy supply sustainability

Sagayama, Yutaka

Denki Hyoron, 95(12), p.34 - 40, 2010/12

no abstracts in English

Journal Articles

Trends of fast reactor cycle technology development in the world, 1; Accelerating fast reactor development; Start of operation of commercial reactors in 2020

Takeda, Toshikazu*; Sagayama, Yutaka; Tsutsumi, Yoshitaka*

Nihon Genshiryoku Gakkai-Shi ATOMO$$Sigma$$, 52(8), p.462 - 467, 2010/08

The development of the fast reactor where the fuel is efficiently produced while consuming the fuel has accelerated in each country. The startup target of a commercial reactors is provided in Russia and India in 2020, in China in around 2030, and Japan, France and Republic of Korea are aiming at the practical use of 2040-2050. It is especially recognized that India and China will actively introduce more than 200 GWe power from fast reactors by middle of this century on the basis of their own national strategy where the fast reactors should be the main current of nuclear power generation. In this article, the trend of the latest development plan of the major countries (Russia, India, China, France, South Korea, and Japan) and international organizations is introduced, centering on the discussion at "International Conference on Fast Reactors and Related Fuel Cycles" by IAEA on December last year in Kyoto City and Tsuruga City.

Journal Articles

Role of "Monju" in the international cooperation for the development of next generation FBR

Nagura, Fuminori; Ichimiya, Masakazu; Sagayama, Yutaka

Genshiryoku eye, 56(6), p.20 - 23, 2010/06

As for Japan because it is energy security guaranty and the like, Japan continued the research and development of FBR ("Joyo", "Monju") and fuel cycle. In recent years, there are a growing interest in the long-term energy security and terrestrial environmental problem. And FBR cycle has again been observed, by the development of young country and the like. This year, reactor operation was reopened after about 14 years, "Monju" is the only prototype FBR reactor which it works as the Western Worlds, and the result of these research and developments is expected even worldwide. JAEA is carrying on international cooperation of "JAEA-CEA", "JAEA-DOE", GIF, IAEA, for the points of view "The efficient development", "Decrease of development risk", "Establishment of worldwide standard technology", "Monju" establishes to the position as base of international research and development, and JAEA makes the best endeavors to "Monju" carrying out worldwide contribution.

Journal Articles

Current status and prespective of FBR cycle development

Sagayama, Yutaka; Nagaoki, Yoshihiro

Nihon Genshiryoku Gakkai-Shi ATOMO$$Sigma$$, 50(6), p.363 - 367, 2008/06

The Japan Atomic Energy Agency is developing the FBR Cycle that is the combination of a sodium cooled FBR (oxide fuel), an advanced aqueous reprocessing and a simplified pelletizing as "Key Technology of National Importance". From now on, the JAEA invests the development resource to a major concept intensively, and aims to put it to practical use by new project, "FaCT". With "FaCT" project, the adoption of innovative technology is going to be judged in 2010. The result of "Fact" are going to be presented in 2015 that is the systematized technologies based on R&D and the conceptual designs of demonstration facility and commercial facility. In order to start the demonstration reactor operation in 2025 by the result of "FaCT", the project is carried with international cooperation.

Journal Articles

Launch of fast reactor cycle technology development project in Japan

Sagayama, Yutaka

Proceedings of International Conference on Advanced Nuclear Fuel Cycles and Systems (Global 2007) (CD-ROM), p.251 - 258, 2007/09

JAEA launched a new FR Cycle Technology Development (FaCT) Project in cooperation with the Japanese electric utilities. The FaCT project is based on the conclusion of the Feasibility Study on Commercialized FR Cycle Systems (FS), which carried out in last seven years. In the FS, the combination of the sodium-cooled FR with oxide fuel, the advanced aqueous reprocessing and the simplified pelletizing fuel fabrication was selected as the main concept which should be developed principally. A conceptual design study of the main concept and R&D of innovative technologies are implemented toward an important milestone at 2015. The development targets, which were set up at the beginning stage of FS, were revised for the FaCT project based on the results of FS and change in Japanese society environment and in the world situation. International collaboration is promoted to pursue fast reactor cycle technology which deserves the global standard and its efficient development.

Journal Articles

The Outline of research and development toward commercialization of FBR cycle technology

Sagayama, Yutaka

Nihon Kikai Gakkai Doryoku Enerugi Shisutemu Bumon Nyusu Reta, (34), p.2 - 3, 2007/05

"Feasibility Study on Commercialized Fast Reactor Cycle Systems (F/S)" progressed in new R&D stage focused on development for commercialization as "Fast Reactor Cycle Technology Development (FaCT)" project based on the result of F/S phase II study and the review by the Japanese Government. In this project, the main concept is the combination of the sodium-cooled fast reactor with oxide fuel, the advanced aqueous reprocessing and the simplified pelletizing fuel fabrication. Conceptual design studies of demonstration and commercial facilities and R&Ds of innovative technologies will be implemented by 2015.

Journal Articles

Outline of fast reactor cycle technology development; Launch of FaCT project

Mukai, Kazuo; Sagayama, Yutaka; Kondo, Satoru; Iwamura, Takamichi; Sugiyama, Toshihide

Genshiryoku eye, 53(3), p.24 - 33, 2007/03

no abstracts in English

Journal Articles

Global movement of FBR cycle development; The Fate of global nuclear energy partnership

Sagayama, Yutaka

Genshiryoku eye, 53(3), p.34 - 37, 2007/03

The FBR cycle development, as movement of GNEP, GIF, INPRO, has activated worldwide. The current status and future prospect of the FBR cycle development in the world were outlined.

Journal Articles

JAEA's response to GNEP

Sagayama, Yutaka

Nihon Genshiryoku Gakkai-Shi, 49(3), p.172 - 178, 2007/03

no abstracts in English

Journal Articles

Prospect of GNEP; Influence of the interim election

Sagayama, Yutaka

Enerugi Rebyu, 27(2), p.42 - 45, 2007/02

no abstracts in English

Journal Articles

Intermediate evaluation of a feasibility study project on commercialized fast reactor cycle systems in Japan

Kotake, Shoji; Namba, Takashi; Sagayama, Yutaka

Proceedings of 13th International Conference on Nuclear Engineering (ICONE-13), 0 Pages, 2005/05

None

Journal Articles

Current Status of a Feasibility Study Project on Commercialized Fast Reactor Cycle Systems in Japan

Kotake, Shoji; Namba, Takashi; Sagayama, Yutaka

Proceedings of 13th International Conference on Nuclear Engineering (ICONE-13), 0 Pages, 2005/05

None

Journal Articles

Promising fast reactor systems in the feasibility study on commercialized FR cycle systems

Sakamoto, Yoshihiko; Kotake, Shoji; Nishikawa, Akira; Enuma, Yasuhiro; Ando, Masato; Sagayama, Yutaka

Proceedings of 13th International Conference on Nuclear Engineering (ICONE-13), 0 Pages, 2005/05

The Feasibility Study on Commercialized Fast Reactor (FR) Cycle Systems is under way in order to propose prominent FR cycle systems that will respond to the diverse needs of society in the future. The design studies on various FR system concepts have been achieved and then the evaluations of potential to achieve the development targets have been carried out. Crucial issues have been found out for each FR system concept and their development plans for the key technologies are summarized as the roadmap. The characteristics and the differences in performances have been investigated. The crucial issues and the development periods have been clarified. Further investigation is now in progress. The promising concept will be proposed based on result of comparative evaluation at the end of the Phase II study.

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