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Report No.
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Atmospheric dispersion simulations of radioactive materials discharged from the Fukushima Daiichi Nuclear Power Plant due to accident; Consideration of deposition process

Nagai, Haruyasu  ; Chino, Masamichi; Terada, Hiroaki   ; Katata, Genki

It is urgent to assess the radiological dose to the public due to the Fukushima Daiichi Nuclear Power Plant accident. JAEA has been undertaking this task by computer simulation of radioactive materials in the environment. The source term of radioactive materials discharged into the atmosphere was estimated. Then, detailed analysis on the local and regional scale dispersion were carried out by WSPEEDI-II simulations. However, there were some discrepancies between calculation and airborne monitoring of surface deposition of $$^{137}$$Cs. The cause of these discrepancies was investigated by carrying out some parametric study with focus on uncertainties due to the deposition process. In these tests, most discrepancies were reduced by modifying wet deposition processes without changing any other conditions. Further examinations are necessary to formulate wet deposition processes properly and to provide more accurate simulation for assessment of the radiological dose to the public.

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