Analysis of radionuclide dispersion in light water reactor building compartments during hypothetical nuclear accidents

We are using ASTEC (Accident Source Term Evaluation Code) software package CPA (Containment part of ASTEC) module to evaluate aerosol behaviour and dispersion into environment with our created model for ABWR reactor, when a loss of coolant accident occurs. Calculation results represent that aerosols deposition is more intensive on relatively low temperature, large area surfaces and majority of aerosols deposit in the first 10 minutes after the accident. With our model, we calculated that percentage of aerosols, which are released into environment, depends on the location of a pipeline rupture