Experimental Study on Natural Circulation and Gas Injection Enhanced Circulation in KYLIN-Ⅱ Mixed Circulation Loop

摘要

Pure lead and its alloys are foreseen to be used as coolant and/or spallation target in the advanced nuclear systems. To investigate the behavior of Lead Bismuth Eutectic (LBE) cooled nuclear systems, KYLIN-Ⅱ Thermal-Hydraulic (KYLIN-Ⅱ TH) mixed circulation test loop has been designed and built in HEFEI by FDS team. The loop is a multipurpose facility aimed to investigate natural circulation, forced circulation and gas enhanced circulation in HLM systems. In this context, experimental data and correlations for the design of nuclear systems cooled with heavy liquid metals will be gained. The work concerns the preliminary tests performed on KYLIN-Ⅱ TH. During the experiments, the facility was operated at 200-350 °C with heating power from 16 kW to 70 kW. The natural circulation, transient circulation and preliminary Loss of Flow Accident (LOFA) was carried out in this work. The experiments show that the steady state of natural circulation is easy to be established in a few minute. The time duration of temperature transition state, during the foundation of natural circulation in start-up of natural circulation test and LOFA in this work, is less than 300 s, however, depended on the operation parameters of the facility.