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Tezuka, Masashi; Mizui, Hiroyuki; Matsushima, Akira; Nakamura, Yasuyuki; Hayashi, Hirokazu; Sano, Kazuya; Nanko, Takashi; Morishita, Yoshitsugu
Proceedings of International Conference on Advanced Nuclear Fuel Cycle; Sustainable Options & Industrial Perspectives (Global 2009) (CD-ROM), p.2815 - 2821, 2009/09
FUGEN is a proto-type heavy water moderated, boiling light water cooled, pressure tube type reactor with 165MWe and has been shut downed on Mar. 2003. Following the approval of decommissioning program in 2008, stage of FUGEN was changed to the decommissioning of the facilities. The program consists of following four periods; (1) Spent fuel transportation, (2) Periphery facilities dismantlement, (3) Reactor dismantlement and (4) Building demolition. It is expected that the whole decommissioning will be completed until 2028. As a part of the work in the spent fuel transportation period, the main steam system and the feeder water system etc. are being dismantled in the turbine building. The remaining tritium in the heavy water system is also being removed for facilitating the dismantlement of the heavy water system. Moreover, method on dismantlement of the reactor core is being studied with considering the process under the water for the radiation shielding and the dust suppression.
Kitamura, Koichi; Hayashi, Hirokazu; Morishita, Yoshitsugu; Tanji, Kazuhiro*
Hoshasen, 34(1), p.53 - 63, 2008/01
It is very important to evaluate radioactive inventory and an amount of radioactive waste accurately for both the planning and the safety assessment on Fugen's decommissioning. Fugen had carried out various radioactive inventory investigations, activation evaluations by materials sampling, neutron measurements, contamination evaluation by investigation of radiation control records, etc. since operation period because Fugen uses heavy water as moderator and its core structure is different from that of LWR. And then, radioactive inventory was evaluated using those investigation data. Moreover, an amount of radioactive waste was estimated by the classification for the radioactive waste disposal based on the evaluated radioactive inventory results. This paper is intended to introduce the evaluation methods and results of the radioactive inventory and estimation of an amount of radioactive waste for Fugen.
Kitamura, Koichi; Morishita, Yoshitsugu; Hayashi, Hirokazu; Tanji, Kazuhiro*; Azekura, Kazuo*; Naito, Yoshitaka*
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Kitamura, Koichi; Hayashi, Hirokazu; Morishita, Yoshitsugu; Murakami, Kazuo*; Namba, Haruyuki*; Matsuo, Kiyoshi*
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Kitamura, Koichi; Hayashi, Hirokazu; Tanji, Kazuhiro*; Morishita, Yoshitsugu
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Hayashi, Hirokazu; Kitamura, Koichi; Morishita, Yoshitsugu; Shigeta, Tatsuo*; Yasu, Takami*
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Kitamura, Koichi; Hayashi, Hirokazu; Morishita, Yoshitsugu; Sakashita, Akira*; Kino, Kenichiro*
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In "Fugen", a turbine system equipment is scheduled to be done in the clearance when it is dismantled for the decommissioning. It is necessary to establish the Clearance examining and approving technique like the method of evaluating the radiation level of the setting of the scaling factor according to the contaminated condition of "Fugen" in advance. The task that undertook the analysis, the evaluation result, and the examining and approving technique establishment of the radiation level for the clearance examining and approving technique establishment that "Fugen" had executed so far and the plan for the future were arranged.
Hayashi, Hirokazu; Sano, Kazuya; Morishita, Yoshitsugu; Shigeta, Tatsuo*; Amada, Kenichi*
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Iwai, Hiroki; Hayashi, Hirokazu; Mori, Naoto; Sano, Kazuya; Morishita, Yoshitsugu; Shigeta, Tatsuo*
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Hayashi, Hirokazu; Mori, Naoto; Sano, Kazuya; Morishita, Yoshitsugu
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Kitamura, Koichi; Tanji, Kazuhiro*; Morishita, Yoshitsugu; Hayashi, Hirokazu; Azekura, Kazuo*; Naito, Yoshitaka*
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Furuuchi, Yuta; Okada, Jumpei; Kimura, Norimichi*; Watanabe, Kazuki; Hayashi, Yoshitsugu*; Hirayama, Yusuke*; Tashiro, Yoshiyuki*; Uchida, Naoki
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At Krypton Recovery Development Facility in Tokai Reprocessing Plant (TRP), the nitrogen gas, which was supplied from the liquid nitrogen tank, was used instead of compressed air to manage the enclosure function of the facility during the compressor was broken. It was necessary to remove the liquid nitrogen tank possible because it had the possibility of being tsunami debris which affect significant impact on the other TRP facility. Before the tank removal, the automatic switching function was attached to the air compressors as nitrogen replacement equipment. This function switches the starting and stopping the compressors, opening and closing valves after detection of equipment failure. When attaching this function, additional equipment was minimized by utilizing existing equipment. Then, the liquid nitrogen tank was dismantled after transporting outside TRP. These works eliminated the cost of purchasing liquid nitrogen and inspections of the equipment.
Kitamura, Koichi; Tanji, Kazuhiro*; Morishita, Yoshitsugu; Hayashi, Hirokazu; Yamaguchi, Katsuyoshi*; Saito, Kuniyoshi*
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no abstracts in English