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Koma, Yoshikazu; Sugiyama, Daisuke*; Ashida, Takashi
Proceedings of International Conference on the Safety of Radioactive Waste Management (Internet), p.153_1 - 153_4, 2016/11
To investigate accident waste management at the Fukushima Daiichi Nuclear Power Station, a methodology of inventory estimation for whole waste including those generated through D&D is indispensable and requires a calculation model. At early stage with insufficient analytical data of waste, a model should be developed by using knowledge of past experience from literature. Uncertainty in estimation shall be decreased based on analytical data available.
Meguro, Yoshihiro; Nakagawa, Akinori; Kato, Jun; Sato, Junya; Nakazawa, Osamu; Ashida, Takashi
Proceedings of International Conference on the Safety of Radioactive Waste Management (Internet), p.139_1 - 139_4, 2016/11
A variety of radioactive wastes have been generated in decommissioning of Fukushima Daiichi Nuclear Power Station. It is necessary to evaluate feasibility of conditioning methods to these wastes, because the majority of such wastes have not been solidified in Japan. The authors investigated an approach for screening of conditioning methods for the Fukushima wastes on the basis of the findings of the existing methods and results of fundamental solidification tests using synthetic Fukushima wastes. Here five solidification methods were selected, and also 13 wastes with different chemical composition are solidified, and characteristics of the solidified form are studied. A screening flow was proposed, and evaluation criteria on each step in the flow was set up. In this presentation a trial result was opened for a waste and improvements of the screening flow found in the trial evaluation was described.
Miyamoto, Yasuaki
no journal, ,
no abstracts in English
Oi, Takao
no journal, ,
Current status and issue on the Decommissioning of Fukushima Daiichi Nuclear Power Station will be explained. Presentation topics are as follows: (1) Background of the activity of the decommissioning of Fukushima Daiichi Nuclear Power Station, (2) Outline of Technical Strategic Plan 2015 for decommissioning of the Fukushima Daiichi Nuclear Power Station, (3) The main points of revision of Mid-and-Long-Term Roadmap towards the Decommissioning of TEPCO's Fukushima Daiichi Nuclear Power Station Units 1-4", (4) Outline of the waste occurred by the accident of the Fukushima Daiichi Nuclear Power Station, (5) Current status and issue of the R&D on the processing, transport, storage and disposal of the waste occurred by the accident of the Fukushima Daiichi Nuclear Power Station
Koma, Yoshikazu; Shibata, Atsuhiro; Ashida, Takashi
no journal, ,
Concerning radioactive nuclides behavior on contamination for the accident of Fukushima Daiichi NPS of Tokyo Electric Power Company Holdings, Inc., classification of nuclides was attempted by using analytical data of activity concentration for various contaminated materials, and influential parameters were discussed.
Shibata, Atsuhiro; Koma, Yoshikazu; Oi, Takao; Takahashi, Hirokazu*
no journal, ,
no abstracts in English
Sugiyama, Daisuke*; Koma, Yoshikazu; Takahatake, Yoko; Aoki, Yoshio*; Nakabayashi, Ryo*; Fujita, Tomonari*
no journal, ,
The introduction of a stochastic approach to the calibration of the radionuclide transport parameters, which processes the frequency distribution of the analytical measured data accumulated progressively on the wastes and contaminated water, into the modelling estimation method of the radioactive waste inventory generated at the Fukushima Daiichi Nuclear Power Station is investigated. It is expected that the accuracy of the modelling estimation of radionuclide composition in wastes will be improved by describing the radionuclide transport parameters as a lognormal distribution.
Sugiyama, Daisuke*; Nakabayashi, Ryo*; Koma, Yoshikazu; Takahatake, Yoko; Aoki, Yoshio*
no journal, ,
no abstracts in English