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Sekine, Takashi; Kitamura, Ryoichi; Maeda, Yukimoto; Chatani, Keiji
no journal, ,
Since in-vessel observation for a sodium fast reactor has to be conducted under severe conditions that include high temperatures (approximately 200
C) and high radiation doses (approximately 200 Gy/h). In addition, since the primary sodium coolant has to be always kept in the reactor vessel to remove the decay heat of fuel subassemblies. Therefore an in-vessel observation equipment has to be designed to not only stand the severe conditions but also be capable of being inserted into the sealed reactor vessel through the holes built into the rotating-plug. In Joyo, in-vessel inspections and repair technologies are developed and applied to observe the upper core structure and bent irradiation test subassembly. The detail design of the Joyo restoration work is now pushed forward based on the in-vessel observation results.
Kitamura, Ryoichi; Sekine, Takashi; Maeda, Yukimoto; Chatani, Keiji
no journal, ,
no abstracts in English
Uchiyama, Gunzo; Yoshida, Kazuo; Yamane, Yuichi; Ueda, Yoshinori*; Takanashi, Mitsuhiro*; Sekine, Keiji*; Fujita, Kunio*
no journal, ,
The study on the release and transport of aerial radioactive materials in reprocessing plants has been conducted under the boiling and drying accident of high level radioactive solution waste beyond the design basis accident. The outline of experimental study plan is presented.
Ueda, Yoshinori*; Takanashi, Mitsuhiro*; Uchiyama, Gunzo; Yoshida, Kazuo; Yamane, Yuichi; Sekine, Keiji*; Fujita, Kunio*
no journal, ,
A study on the release and transport of aerial radioactive materials in reprocessing plants was stared to develop risk assessment methods. The background and event of study will be presented.
Sekine, Keiji*; Fujita, Kunio*; Kodama, Takashi*; Tamauchi, Yoshikazu*; Uchiyama, Gunzo; Yoshida, Kazuo; Yamane, Yuichi; Ueda, Yoshinori*; Takanashi, Mitsuhiro*
no journal, ,
A study on the release and transport of aerial radioactive materials in reprocessing plants was started. The cooling system of high active liquid waste in reprocessing plants and the release and transport of aerial radioactive materials in reprocessing plants at loss of cooling events were surveyed.