Parrad System and Its Testing on Real Radioactive Emissions Into the Atmosphere

A system for predicting accidental dissemination of radionuclides into the atmosphere at operating NPP (PARRAD) is described. The methodological and functional components of the system are presented. The results of testing the system on examples of accidental emissions at the Fukushima NPP, an incident at a heavy machine building plant in Elektrostal, and emissions in the ACURATE experiment are presented.