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Journal Articles

Status and future plan of decommissioning of the Plutonium Fuel Fabrication Facility

Kuba, Meiji; Watahiki, Masatoshi; Hirano, Hiroshi; Ishikawa, Shinichiro; Sato, Hisato

Proceedings of International Waste Management Symposia 2014 (WM 2014) (Internet), 12 Pages, 2014/05

Plutonium Fuel Fabrication Facility is now in a decommissioning phase. In the facility, stabilizing activities of nuclear material residuals remained and the gloveboxes dismantling activities have been carried out simultaneously. Glovebox dismantling activities are performed manually by a worker wearing air-feed suit with mechanical tools in a plastic enclosure which is constructed around the glove boxes for preventing spread of contamination. However, the mental load and physical load of the worker are intensively high. Therefore, worker's safely issue still exists and need to be resolved. Moreover, occupational time for the worker is restricted to only one hour per day, which in turn make shortening schedule and cost savings almost impossible. R&D of new dismantling methods including application of heavy equipment with anti-contamination measure to strengthen the work performance in the plastic enclosures has been started to reduce the above mentioned potential risks and costs.

Journal Articles

Release behavior of radioactive materials at a boiling accident of high active liquid waste in reprocessing plants

Uchiyama, Gunzo; Tashiro, Shinsuke; Amano, Yuki; Abe, Hitoshi; Yamane, Yuichi; Yoshida, Kazuo; Ishikawa, Jun

Proceedings of International Waste Management Symposia 2014 (WM 2014) (Internet), 9 Pages, 2014/05

The experimental study for source term data of radioactive materials has been conducted at a boiling accident of high active liquid waste (HALW) in a reprocessing plant. In the small scale cold test using a non-radioactive simulated HALW, the release behavior of FP elements from the simulated HALW were investigated under various boiling accident conditions. In the engineering scale cold test, the release behavior of FP elements at boiling accident conditions was investigated mainly as a spatial function. In the small scale hot test using a radioactive simulated HALW, the release behavior of radioactive materials (FP, alpha nuclides) were obtained under typical boiling accident conditions. In the small scale hot test, the release fractions of Ru and non-volatile FPs obtained were almost the same as those of the small scale cold test.

Oral presentation

Oral presentation

The Preparation for the clearance system and its operational issues in FUGEN

Kutsuna, Hideki; Izumi, Masanori

no journal, , 

The waste which does not need to be treated as a radioactive material by the clearance system shall be recycled in FUGEN. However the commencing time of the radioactive waste disposal facility operation isn't clear, though, it is important to operate the clearance system and take out the dismantled objects from FUGEN in order to push forward decommissioning as much as possible at the current moment. Although the dismantled objects have temporarily been stored in the facility, the space for the storing is getting reduced year by year. So, the dismantled objects need to take out by the clearance system in early time. In poster presentation, the preparation for the clearance system and its operational issues in FUGEN will be reported.

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