Modelling of radionuclides dispersion in coastal waters. A study case on the dispersion of radionuclides released with the liquid effluents of Angra dos Reis NPP - Brazil

The problem of the dispersion of radionuclides at coastal areas is discussed. The study focused on the dispersion of 3H and 137Cs released at Ribeira Bay, Rio de Janeiro, Brazil, with the liquid effluents of the Angra dos Reis nuclear power plant. It has been demonstrated that due to the site specific hydrodynamics the exportation of radionuclides to the open ocean would be a rather fast process. The study also examined the best strategy for accidental releases. It could be evaluated that in terms of the radionuclide inventory in the boxes the release at Itaorna Inlet would be a better option than the release at Piraquara de Fora Inlet. However, this option should be examined after a detailed dose assessment study. (author)