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Nagata, Shuhei*; Ogawa, Yusuke*; Suzuki, Satoru*; Inoue, Hiroyuki*; Watanabe, Yutaka*; Yamamoto, Masahiro*; Abe, Hiroshi*; Mitsui, Seiichiro
NUMO-TR-22-02, p.21 - 22, 2023/03
no abstracts in English
Imaizumi, Tomomi; Miyauchi, Masaru; Ito, Masayasu; Watahiki, Shunsuke; Nagata, Hiroshi; Hanakawa, Hiroki; Naka, Michihiro; Kawamata, Kazuo; Yamaura, Takayuki; Ide, Hiroshi; et al.
JAEA-Technology 2011-031, 123 Pages, 2012/01
JAEA-Technology-2011-031.pdf:16.08MB
The number of research reactors in the world is decreasing because of their aging. However, the planning to introduce the nuclear power plants is increasing in Asian countries. In these Asian countries, the key issue is the human resource development for operation and management of nuclear power plants after constructed them, and also the necessity of research reactor, which is used for lifetime extension of LWRs, progress of the science and technology, expansion of industry use, human resources training and so on, is increasing. From above backgrounds, the Neutron Irradiation and Testing Reactor Center began to discuss basic concept of a multipurpose low-power research reactor for education and training, etc. This design study is expected to contribute not only to design tool improvement and human resources development in the Neutron Irradiation and Testing Reactor Center but also to maintain and upgrade the technology on research reactors in nuclear power-related companies. This report treats the activities of the working group from July 2010 to June 2011 on the multipurpose low-power research reactor in the Neutron Irradiation and Testing Reactor Center and nuclear power-related companies.
Nagata, Shuhei*; Inoue, Hiroyuki*; Kitayama, Ayami; Dobashi, Ryuta*
no journal, ,
no abstracts in English
Ogita, Yasuhiro; Sando, Kazusa*; Ishibashi, Kozue*; Sakata, Shuhei*; Ono, Takeshi*; Suzuki, Satoshi*; Yokoyama, Tatsunori; Kagami, Saya; Nagata, Mitsuhiro; Yuguchi, Takashi*
no journal, ,
no abstracts in English
Nagata, Shuhei*; Kawasaki, Manabu*; Wada, Yuki*; Mitsui, Seiichiro
no journal, ,
In the geological disposal of high-level radioactive waste, after the overpack (OP) is placed, the water content in the bentonite changes from unsaturated to saturated due to groundwater seeping in from the outside of the buffer material. The Nuclear Waste Management Organization of Japan plans to conduct corrosion tests to understand the corrosion behavior of carbon steel and copper in such a transitional environment, and is currently selecting a corrosion sensor to be used for monitoring the corrosion behavior. As monitoring methods, electrochemical impedance spectroscopy (EIS), direct current potential difference spectroscopy, and electrochemical noise spectroscopy are being considered. Among these, a corrosion sensor based on the EIS method, which has been used at the Horonobe Underground Research Center, was made thin to fit the test equipment. In this report, to confirm the applicability of this thinned corrosion sensor, the corrosion behavior of carbon steel was monitored in an environment where the water content in the bentonite changes transiently. The corrosion rate based on the monitoring data can be converted to several tens of 
m per year, and it was confirmed that this is the same as the corrosion rate in an oxidizing atmosphere, as with the prior corrosion sensor. From the results, it is considered that the thinned corrosion sensor can be applied to monitoring corrosion behavior.
Kitayama, Ayami; Nagata, Shuhei*; Inoue, Hiroyuki*; Dobashi, Ryuta*
no journal, ,
no abstracts in English
Suzuki, Satoshi*; Asai, Nobuo*; Nakashima, Kazuo*; Ogita, Yasuhiro; Yokoyama, Tatsunori; Sakata, Shuhei*; Ono, Takeshi*; Nagata, Mitsuhiro*; Yuguchi, Takashi*
no journal, ,
no abstracts in English
Nagata, Hiroshi; Yamaura, Takayuki; Naka, Michihiro; Kawamata, Kazuo; Izumo, Hironobu; Hori, Naohiko; Nagao, Yoshiharu; Kusunoki, Tsuyoshi; Kaminaga, Masanori; Komori, Yoshihiro; et al.
no journal, ,
Conceptual design of the high-performance and low-cost next generation materials testing reactor which will be assumed to introduce to the nuclear power plant introduction country started from 2010 in the JAEA. Japanese atomic energy-related companies participate in this project, and this activity role as the environmental management and nuclear human resource development for the new research reactor designs. 10 MW thermal power by plate type fuel elements and swimming pool type was assumed as a design base. High safety, high cost performance, high reactor operation rate, high technology irradiation are targets of this conceptual design.
