Development and validation of atmospheric dispersion: computer program using tritium air concentrations in the environment around heavy water reactor power plants

We have developed a computer program ATDC (Atmospheric Tritium Dispersion Code) to predict downwind tritium air concentrations in the environment around nuclear power plants on the basis of the Gaussian plume model. The tritium air concentrations by field measurement [measured tritium air concentrations in the areas adjacent to Wolsong Unit 1, a pressurized heavy water reactor (PHWR)] were compared with that by calculation to validate the program. The predicted and measured atmospheric tritium concentrations were quite consistent in trend and magnitude. This computer program will be useful in reviewing and evaluating environmental radiological impacts for PHWRs. Especially, it will be of great help to predict the behavior of tritium in the atmospheric environment around nuclear power plants.