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Meigo, Shinichiro; Oi, Motoki; Ikezaki, Kiyomi*; Kawasaki, Tomoyuki; Kinoshita, Hidetaka; Akutsu, Atsushi*; Nishikawa, Masaaki*; Fukuda, Shimpei
Proceedings of 12th International Topical Meeting on Nuclear Applications of Accelerators (AccApp '15), p.255 - 260, 2016/00
reflector and proton beam windowTeshigawara, Makoto; Kinoshita, Hidetaka; Wakui, Takashi; Meigo, Shinichiro; Seki, Masakazu; Harada, Masahide; Ito, Manabu; Suzuki, Toru; Ikezaki, Kiyomi; Maekawa, Fujio; et al.
JAEA-Technology 2012-024, 303 Pages, 2012/07
JAEA-Technology-2012-024.pdf:46.04MB
3 GeV Protons with 1 MW beam power are irradiated to mercury target of spallation neutron source in Materials and Life science Facility (MLF), which is one of facilities of J-PARC. Irradiated components, such as target container, moderator, reflector and proton beam window, are needed to replace periodically due to irradiation damage of high energy protons and neutrons. These used components are replaced remotely because of highly activated. Maintenance scenario was settled so as to handle these components. Required remote handling machines were designed and installed in hot cell and other room of the MLF. We performed remote handling tests by using actual components to confirm the design. We report results, such as replacement procedure, trouble and its solution, etc., for moderator, reflector and proton beam window in order to provide the handling of actual used components.
Sakai, Kenji; Sakamoto, Shinichi; Kinoshita, Hidetaka; Seki, Masakazu; Haga, Katsuhiro; Kogawa, Hiroyuki; Wakui, Takashi; Naoe, Takashi; Kasugai, Yoshimi; Tatsumoto, Hideki; et al.
JAEA-Technology 2011-039, 121 Pages, 2012/03
JAEA-Technology-2011-039.pdf:10.87MB
This report investigates the behavior, damage and restoration of a neutron source station of the MLF at the Great East Japan Earthquake and verified the safety design for emergency accidents in the neutron source station. In the MLF, after an occurrence of the Earthquake, strong quakes were detected at the instruments, the external power supply was lost, all of the circulators shut down automatically, and the hydrogen gas was released. The leakages of mercury, hydrogen and radio-activation gases did not occur. While, the quakes made gaps between the shield blocks and ruptured external pipe lines by subsidence around the building. But significant damages to the components were not found though the pressure drop of compressed air lines influenced on a target trolley lock system and so on. These results substantiated the validity of the safety design for emergency accidents in the source station, and suggested several points of improvement.
Sakai, Kenji; Futakawa, Masatoshi; Takada, Hiroshi; Sakamoto, Shinichi; Maekawa, Fujio; Kinoshita, Hidetaka; Seki, Masakazu; Haga, Katsuhiro; Kogawa, Hiroyuki; Wakui, Takashi; et al.
Proceedings of 20th Meeting of the International Collaboration on Advanced Neutron Sources (ICANS-20) (USB Flash Drive), 6 Pages, 2012/03
This report investigates behaviors and damages of each component in a neutron target station of the MLF at the J-PARC at the time of the Great East Japan Earthquake (GEJE). At the date of the GEJE, in the MLF, strong quakes were detected at several instruments, an external power supply were lost, all of the circulation systems were shut down automatically, and a hydrogen gas was released as planned. Leakage of activation liquids and gases did not occur. While, the quakes made gaps between shield blocks and ruptured external pipe lines for air and water by subsidence. But significant damages on the components of the target station were not found though a loss of compressed air supply affected lock systems with air cylinders and pneumatic operation values. These results substantiated a validity of safety design on the target station for emergency accidents.
Meigo, Shinichiro; Fujimori, Hiroshi*; Kai, Tetsuya; Kasugai, Yoshimi; Oi, Motoki; Ono, Takehiro; Ikezaki, Kiyomi; Shinomiya, Kenji; Sakamoto, Shinichi
no journal, ,
no abstracts in English
Oi, Motoki; Kai, Tetsuya; Ono, Takehiro; Ikezaki, Kiyomi; Haraguchi, Tetsuya; Fujimori, Hiroshi*; Sakamoto, Shinichi; Meigo, Shinichiro
no journal, ,
no abstracts in English
Meigo, Shinichiro; Oi, Motoki; Kai, Tetsuya; Harada, Masahide; Ikezaki, Kiyomi; Haraguchi, Tetsuya; Fujimori, Hiroshi*; Sakamoto, Shinichi; Ono, Takehiro
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no abstracts in English
Meigo, Shinichiro; Oi, Motoki; Kai, Tetsuya; Ono, Takehiro; Ikezaki, Kiyomi; Haraguchi, Tetsuya; Akutsu, Atsushi; Sakamoto, Shinichi; Fujimori, Hiroshi*
no journal, ,
no abstracts in English
Meigo, Shinichiro; Oi, Motoki; Kai, Tetsuya; Ono, Takehiro; Harada, Masahide; Ikezaki, Kiyomi; Haraguchi, Tetsuya; Akutsu, Atsushi; Fujimori, Hiroshi*; Sakamoto, Shinichi
no journal, ,
no abstracts in English
Meigo, Shinichiro; Oi, Motoki; Kai, Tetsuya; Ikezaki, Kiyomi; Haraguchi, Tetsuya; Akutsu, Atsushi; Fujimori, Hiroshi*; Sakamoto, Shinichi; Ito, Manabu; Futakawa, Masatoshi
no journal, ,
no abstracts in English
Meigo, Shinichiro; Oi, Motoki; Kai, Tetsuya; Ikezaki, Kiyomi; Haraguchi, Tetsuya; Akutsu, Atsushi; Fujimori, Hiroshi*; Sakamoto, Shinichi; Ito, Manabu; Futakawa, Masatoshi
no journal, ,
no abstracts in English
Meigo, Shinichiro; Oi, Motoki; Kai, Tetsuya; Ikezaki, Kiyomi; Haraguchi, Tetsuya; Akutsu, Atsushi; Fujimori, Hiroshi*; Sakamoto, Shinichi; Ito, Manabu; Futakawa, Masatoshi
no journal, ,
no abstracts in English
Meigo, Shinichiro; Oi, Motoki; Kai, Tetsuya; Ikezaki, Kiyomi; Akutsu, Atsushi; Haraguchi, Tetsuya; Fujimori, Hiroshi*; Sakamoto, Shinichi; Ito, Manabu; Futakawa, Masatoshi
no journal, ,
no abstracts in English
Meigo, Shinichiro; Oi, Motoki; Akutsu, Atsushi; Ikezaki, Kiyomi*
no journal, ,
no abstracts in English