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Mukai, Kazuo; Arai, Masanobu; Ito, Kazuhiro; Okawachi, Yasushi
Nihon Genshiryoku Gakkai-Shi ATOMO
, 56(9), p.554 - 560, 2014/09
no abstracts in English
Konomura, Mamoru; Ichimiya, Masakazu; Mukai, Kazuo
Proceedings of International Conference on Fast Reactors and Related Fuel Cycles (FR 2009) (CD-ROM), 9 Pages, 2012/00
Japanese prototype fast breeder reactor, Monju, will soon restart. Monju has three sodium loops with steam generators and a turbin-generator, 280 MWe. Monju is expected to demonstrate the sodium technology and the sodium-water heat exchange technology in Japan. It will be operated at full power operation during around 10 years after restart in order to accumulate operation & maintenance experience and to evaluate its design technology. After the system start-up test (SST), Monju will be operated under full power. In this stage, the main object of Monju operation will be to achieve its initial targets which were fixed when its construction was decided around thirty years ago. The targets are to demonstrate a safe and reliable operation, that is, accumulation of the operation & maintenance experience and evaluation of the design technology, and to establish sodium handling technology. For example, inspection and diagnosis technologies are important for maintenance of a sodium cooled reactor. An out-of-pile sodium test facility will be constructed near Monju in order to make many tests of inspection devices and research many chemical tests. At the same time, the activities for the performance improvement, for example, a new licence, will be prepared in order to utilize Monju as a R&D facility. After the accumulation of operating experience, Monju will be enhanced the performance as a R&D facility in order to demonstrate innovative technologies, for example, irradiation of advanced fuel, longer operation cycle, higher burnup. For this purpose, Monju will be needed to get a new licence and core modification. And Monju on-site non-destructive Post Irradiated Evaluation facility will be expected at this stage. There were many R&D works in Japan with sodium out-of-pile facilities. All the experience were reflected in the design of Monju. Monju will demonstrate a handling of sodium technologies under power plant operation.
Mukai, Kazuo
Gijutsu Sogoshi OHM, 98(1), p.39 - 44, 2011/01
no abstracts in English
Nakai, Satoru; Kaneko, Yoshihisa; Mukai, Kazuo
Hozengaku, 9(4), p.44 - 49, 2011/01
The sodium leak accident in a secondary main cooling system of prototype fast breeder reactor Monju on December 8th in 1995, and the Monju has shut down for 14 and half years since that. JAEA improved the safety by investigating the sodium leakage accident, taking countermeasures such as better understanding by the local's, improvement of operation. In the maintenance field, the confirmation of Monju systems and components integrity, systems improvement as sodium leak countermeasures, introduction of the maintenance program to resolve maintenance problems. Monju restarted on May 6th 2010 after the confirmation of restart readiness by safety authorities and the core confirmation test which is first test after restart was continued to July 22nd as planned.
Morizono, Koji; Takeuchi, Norihiko; Takayama, Koichi; Deshimaru, Takehide; Mukai, Kazuo
Proceedings of 16th Pacific Basin Nuclear Conference (PBNC-16) (CD-ROM), 5 Pages, 2008/10
Prototype fast breeder reactor Monju is the first power generating FBR in Japan which is a plant for research & development to demonstrate reliability of fast breeder reactor as a power plant and establish sodium handling technology etc. Monju started construction in 1985, achieved initial criticality in 1994 and attained 40% output in 1995, however the sodium leak accident occurred during the test operation at the end of that year. Since then, the plant remained shut down for 12 years. In this subject, our efforts for the restart of this long term shut down plant will be presented.
Mukai, Kazuo
Enerugi Rebyu, 27(9), p.42 - 45, 2007/09
The Japanese government assessed the result of "Feasibility Study on Commercialized FR Cycle System 2nd Phase" and a major concept that is the combination of a sodium cooled FBR (oxide fuel), an advanced aqueous reprocessing and a simplified pelletizing was selected. 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.
Mukai, Kazuo
Genshiryoku Sogo Shimpojiumu 2007 Koen Rombunshu, p.111 - 118, 2007/05
The Japanese government assessed the result of "Feasibility Study on Commercialized FR Cycle System 2nd Phase" and a major concept that is the combination of a sodium cooled FBR(oxide fuel), an advanced aqueous reprocessing and a simplified pelletizing was selected. 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.
Mukai, Kazuo; Sagayama, Yutaka; Kondo, Satoru; Iwamura, Takamichi; Sugiyama, Toshihide
Genshiryoku eye, 53(3), p.24 - 33, 2007/03
no abstracts in English
Mukai, Kazuo
21-Seiki No Kankyo To Enerugi O Kangaeru, Vol.31, p.5 - 20, 2006/08
no abstracts in English
Mukai, Kazuo
Genshiryoku eye, 52(6), p.20 - 23, 2006/06
no abstracts in English
Mukai, Kazuo
Enerugi Rebyu, 26(4), p.8 - 11, 2006/04
no abstracts in English
Mukai, Kazuo; Niwa, Hajime; Sagayama, Yutaka; Ono, Katsumi*
no journal, ,
no abstracts in English
Mukai, Kazuo
no journal, ,
no abstracts in English
Mukai, Kazuo
no journal, ,
The Japanese government assessed the result of "Feasibility Study on Commercialized FR Cycle System 2nd Phase" and a major concept that is the combination of a sodium cooled FBR(oxide fuel), an advanced aqueous reprocessing and a simplified pelletizing was selected. 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.
Mukai, Kazuo
no journal, ,
The Japanese government assessed the result of "Feasibility Study on Commercialized FR Cycle System 2nd Phase" and a major concept that is the combination of a sodium cooled FBR (oxide fuel), an advanced aqueous reprocessing and a simplified pelletizing was selected. 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.
Nakai, Satoru; Mukai, Kazuo
no journal, ,
no abstracts in English
Ohira, Hiroaki; Ichimiya, Masakazu; Mukai, Kazuo; Kitamura, Takafumi
no journal, ,
A nuclear fuel cycle technology is expected to supply sufficient energy over a period of long time and to provide a measure of control of CO
from the point of view of global warming. JAEA have developed the prototype FBR, Monju, since a fast breeder reactor (FBR) is a key technology of the nuclear fuel cycle. On December 8, 1995, however, the secondary sodium was leaked and the SSTs have been suspended. The Monju operation and the system start-up tests (SSTs) started on this May 6. In this abstract, the outline of Monju and the SSTs are described and the R&D programs applied to a demonstration FBR are also explained.
Mukai, Kazuo
no journal, ,
Japan Atomic Energy Agency (JAEA) develops FBR and related fuel cycle systems in Japan, and Monju, a 280 MWe prototype of sodium cooled fast breeder reactor, is the key plant of FBR's development. Monju restarted on May 6 after 14 year and 5 month-suspension since December 1995 when sodium coolant leaked from a temperature sensor in the secondary system piping. After the sodium coolant leakage, a thorough investigation of the cause and a study of preventive measures were carried out, and plant modification, the modified system function test and the entire system function Test including refuelling were conducted. JAEA fixed start-up agreements with local governments, and consequently on May 6 this year, Monju restarted and attained the criticality on May 8. Monju System Startup Test (SST) begun on May 6 will be continued for three years. At the first Core Confirmation Test at zero power was carried out until the end of July.
