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Numerical simulations of short-term migration processes of dissolved Cesium-137 due to a hypothetical accident of a nuclear submarine in the Japan Sea

Kobayashi, Takuya ; Chino, Masamichi; Togawa, Orihiko 

A dissolved radionuclide migration code system that consists of a ocean circulation model, Princeton Ocean Model, and a particle random-walk model, SEA-GEARN, has been developed. The oceanic migration of $$^{137}$$Cs discharged from a nuclear submarine in a hypothetical accident at the Tsushima Strait was calculated in the southwestern area of the Japan Sea as a model application. The calculations for instantaneous releases every 10 days were carried out for one year to study the seasonal differences of migration process of the dissolved radionuclides. The migration tendencies of dissolved radionuclides were divided into two patterns. For the releases started from January to September, all of the high concentration areas migrated to the northeast along the coastline of the Main Island of Japan from the release point. As for the releases from October to December, some high concentrations areas migrated to the west from the release point and the concentrations of $$^{137}$$Cs along the coastline of the Main Island of Japan were comparatively low.

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Category:Nuclear Science & Technology

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