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Development of a system for the prediction of radionuclide migration in the off Shimokita region and its case study

Kobayashi, Takuya ; In, Teiji*; Ishikawa, Yoichi*; Matsuura, Yasutaka*; Shima, Shigeki*; Nakayama, Tomoharu*; Awaji, Toshiyuki*; Kawamura, Hideyuki ; Togawa, Orihiko 

The radionuclides migration forecasting system in the off Shimokita region has been developed to predict the routine and accidental releases of liquid radioactive wastes during the operations of a spent nuclear fuel reprocessing plant in Aomori prefecture, Japan. The results obtained from the case studies are as follows; (1) The ocean general circulation model by using the techniques of data assimilation and nesting reproduced well the flow pattern of a coastal area. (2) The estimated internal dose due to ingestion of marine products from hypothetical release of $$^{3}$$H was 0.45 $$mu$$Sv/y. (3) The results of hypothetical release of $$^{137}$$Cs showed that about four percent of the whole deposited on the seabed after a 60-day calculation. The concentration of $$^{137}$$Cs of hypothetical release from the off Shimokita region is the same or less than that of global fallout measured at the same area.

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