Estimation of the inventory of the radioactive wastes in Fukushima Daiichi NPS with a radionuclide transport model in the contaminated water |
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Authors: | Atsuhiro Shibata Yoshikazu Koma Takao Ohi |
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Affiliation: | 1. Department of Fukushima Technology Development, Nuclear Backend Technology Center, Nuclear Fuel Cycle Engineering Laboratories, Japan Atomic Energy Agency, 4-33, Muramatsu, Tokai-mura, Naka-gun, Ibaraki, Japan;2. Waste Management Division, Collaborative Laboratories for Advanced Decommissioning Science, Japan Atomic Energy Agency, 4-33, Muramatsu, Tokai-mura, Naka-gun, Ibaraki, Japan |
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Abstract: | Quantification of the radioactive waste inventory remaining inside the reactors at Fukushima Daiichi NPS is necessary to effectively plan their recovery, treatment, and disposal. Analysis of radionuclide concentrations and secondary wastes in the contaminated water treatment system can provide a means to estimate the radioactive waste inventory, which is not possible by more direct methods due to problems of accessibility and high levels of radiation. A predictive model has therefore been developed to estimate the radioactive waste inventory from the radionuclide concentrations and throughputs in the contaminated water. Model fitting has enabled the estimation of the key parameters, such as the initial radionuclide concentration C0, the continuous release rate F, and inventory of source of continuous release IS0. An estimated one-third of the total 137Cs inventory has already made its way into the water treatment system as secondary wastes, whereas half still remains inside the damaged reactors as of 13 March 2014. |
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Keywords: | Fukushima Daiichi Nuclear Power Station estimation of inventory contaminated water water treatment system secondary waste calculation |
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