MODELLING of SPRAY COOLING PONDS of NUCLEAR POWER PLANT JETE
ZITNY Rudolf, Hoffman Pavel
PART I.
The report describes simulation programs for modelling of spray ponds
for safe shut down and cool down the nuclear power plant JETE. The simulation
programs evaluate transient temperatures of water in cooling ponds, water losses
due to evaporation and wind under
variable meteorological parameters (time courses of air temperatures, dew
temperatures, wind speed, solar radiation), variable flowrate in sprays (controlled by pond temperature)
and variable heat source (modelling e.g. loss of coolant accident).
The models assume either piston flow or ideal mixing of water in the pond.
The simplified model is shown on the following figure:
PART II. Spray cooling
Evaluation of droplets trajectories, cooling
and evaporation under different
meteorological conditions.
Results are summarized into correlations for thermal
efficiency of nozzles and water losses in a spray array.
PART III. Nozzles and droplets distributions
Pressure drop in tangential nozzles, mean diameters of droplets, and
droplet velocities. Estimates of droplets diameter distributions.
peoples
mailto: Zitny