Water evaporation rate of RSG-GAS spent fuel storage pool

Abstract

Water in spent fuel storage pool that serves as a water cooling of decay heat and radiation shielding must be kept steady from evaporation. Knowledge of the evaporation rate of spent fuel storage pool is needed so that the amount of make up water can be well known for nuclear safety purposes. This study aims to calculate the rate of water evaporation in RSG-GAS spent fuel storage pool. The Shah and Carrier correlations were used to calculate the rate of evaporation based on operational data obtained in the spent fuel storage pool, i.e, pond water temperature, room temperature, relative humidity, and airflow velocity in the SFSP building. The evaporation rate calculation was performed in two conditions: during ventilation and air conditioning are operated and not operated. The calculation result shows that the rate of water evaporation rises from 0.0138 kg / m2.h to 0.0747 kg / m2.h when using Shah correlation, and from 0.0153 kg / m2.h to 0.0831 kg / m2.h when using Carrier correlation. From the calculation found that the needs of make-up water per day to replace the water loss by evaporation is 42.28 - 43.84 kg / day. The rate of evaporation of pond water during operational of ventilation air conditioning is greater than when ventilation air conditioning is not operated. The result shows that the increase of water evaporation rate of spent fuel storage pool is strongly influenced by the increase of vapor pressure difference and the length of operation time of VAC.