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Report No.
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Development of calculation methodology for estimation of radionuclide composition in wastes generated at Fukushima Daiichi Nuclear Power Station

Sugiyama, Daisuke*; Nakabayashi, Ryo*; Koma, Yoshikazu  ; Takahatake, Yoko  ; Tsukamoto, Masaki*

A calculation methodology for estimating the radionuclide composition in the wastes generated at the F1NPS has been developed by constructing a skeleton overview of the distribution of radionuclides considering the material balance in the system and calculation flowcharts of the transportation of radionuclides into the wastes. The wastes have a distinctive feature that their level of contamination includes considerable uncertainties. The developed method can explicitly specify the intrinsic uncertainties as a band to be included in the estimated radionuclide composition and can quantitatively describe the uncertainties by calibration using data on actual waste samples. Further studies to improve the quality of the calculation method, and acquiring a quantitative understanding of the spatial distribution of radionuclides inside the reactor building are suggested to be important steps toward reasonable and sustainable waste management as an integral part of the decommissioning.

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Category:Nuclear Science & Technology

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