Study of thermal hydraulics in a fuel element mock-up during dry-out with a thermal anemometry grid sensor

The paper presents investigation results on the cooling effect of rising steam on heated rods during a loss of cooling accident scenario in a fuel element mock-up in the spent fuel pool. Therefore, the newly developed thermal anemometry grid sensor was used. With the measured time course of gas-phase temperature and velocity in the subchannels the convection cooling of the rods by steam was verified.