STUDY ON DISPERSION OF AIRBORNE RADIONUCLIDES RELEASED FROM NUCLEAR POWER PLANT UNDER HYPOTHETICAL ACCIDENTAL SCENARIO

The radionuclides release to the environment, as a consequence of a severe accident in Nuclear Power Plant; NPP, could be of considerable contribution to the public risk. Accordingly, to predict the human risk and the environmental impact due to the released source term, the transport of radionuclides to human through the environment should be well understood. This work is aimed at study the centerline atmospheric dispersion calculation of radioactive airborne released from a hypothetical severe accident of nuclear power plant. The main objective is to develop two computer programmes. First, to predict the short range atmospheric dispersion of the radioactive materials through the environment and to determine the air concentration and ground deposition of the released radionuclides as a function of downwind distance, around the NPP, on the basis of the Gaussian plume model. The other programme is for the computation the radiological dose received by the public. Short-Range Atmospheric Dispersion Calculation; SRADC, is a computer programme developed to perform the atmospheric dispersion calculation. The data are obtained for the zones around the NPP up to 100 km away. The site meteorological conditions including wind direction, wind velocity and the stability classes are used for the time intervals under study. The programme takes into account the radioactive decay and the ingrowths in the calculations. The effective dose equivalent as a function of distance from NPP is calculated focusing on the first few hours following the release using the particularly developed Radiological Dose Calculation; RDC, programme.