Abstract
During a loss-of-coolant and core meltdown accident at a nuclear power plant fission products enter the atmosphere inside the protective shell. One of the main factors determining the effect on the environment, the dose loads in personnel and the general public in the first days after the accident is radioactive iodine. To evaluate the mass of the radioactive iodine entering the environment, it is necessary to calculate its concentration in the protective shell. The model developed to describe the dynamics of iodine and the computational module in the integrated code make it possible to perform numerical modeling of the behavior of iodine in the protective shell in the case of accidents at nuclear power plants with VVER reactors. The model makes it possible to take account of the effect of physicochemical processes on the formation of volatile forms of iodine as well as the dynamics of thermohydraulic parameters on the iodine distribution. Verification showed an adequate description of the dynamics of the volatile forms of iodine in the protective shell.
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