Evaluation of the Radioactive Wastes Disposal Into the Deep Ocean

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Abstract
A hazard assessment is presented for deep sea disposal of low level radioactive solid wastes which originate from nuclear power reactors in Japan. The model takes account of leaching characteristics of radionuclides from wastes solidified with cement, which was not considered in other papers. Maximum and average concentations of radionuclides in an upper mixed layer of the sea are estimated, and maximum doses for individuals and population doses for Japanese people are calculated. To evaluate an uncertainty of parameters in the model, a sensitivity analysis was performed. The discussions included: which parameter in an equation of the model most affects the average concentration of radionuclides in upper mixed layer, and to what degree the fluctuation of parameters due to the variation of environmental factors affects the concentration. Generally, the most sensitive parameter is the depth of the sea where the solidified wastes would be deposited. The concentration of radionuclides in the surface water is not sensitively affected by the vertical diffusion coefficient.

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