Abstract
During a loss-of-coolant accident in a nuclear power plant with a VVER reactor, volume condensation of the steam occurs in the enclosures of the containment shell. This condensation not only determines the volume distribution of heat and moisture sources in the inside the shell and participates in the formation of the pressure and temperature fields, but it also influences the transport of fission products. The volume condensation model implemented in the KUPOL-M code using lumped parameters includes differential equations for the droplet number density, the average radius of a drop with a fixed drop-size spectrum, and the equation describing the transport of the droplet component density. Comparison of the calculations and the experimentally measured characteristics of the medium for steam blown over a large free volume shows that such a model is sufficient for simulating the dynamics of the integral parameters of the medium during a loss-of-coolant accident.
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