Report on reflood series 1 experiment

Results of the Reflood Series 1 Experiment carried out from September to October 1974 are described. The conditions of experiment are : (1) direct water injection into the test section at constant rate, (2) operation under atmospheric pressure, and (3) maximum allowable temperature 6000C for heater rods. Objectives of the Series 1 experiments are (1) to obtain thermo-hydrodynamic data for the flow channel and (2) to check performance of the test rig and data processing. The rate of temperature fall during quench is much larger than that in PWR-FLECHT tests, and droplets flying through the test section are one of dominant causes for quench phenomenon. Test rig operation and data processing are as expected with problems of temperature detection, data signals amplification, and water temperature control. (auth.)