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Report No.

Radiological assessment of multilateral radioactive effluents in the Pacific Ocean

Nakano, Masanao ; Takeishi, Minoru 

The liquid effluent has been discharged from each nuclear fuel cycle facility in mainly industrially advanced nations with authorization. Since the safety assessment confirms that environmental impact from each facility would be small enough, it was not necessary to assess the effect of the multilateral radioactive effluents. But it will be necessary to quantify the radiological impact between plural countries due to the increase of interest to the global environment and of demand on nuclear energy in the world. In this study, the long-term and multilateral environmental radiological assessment from tritium discharge by effluents from nuclear fuel cycle facilities in the world was carried out. Then, collective and effective doses were evaluated in case of intake of marine products. Additionally, an assessment from the nuclear testing in the atmosphere was carried out. As a result, the concentration and dose level was confirmed not to become an issue for global scale, even if Rokkasho reprocessing plant operates with full scale.



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