An Integral Effect Test on the Reflood Period of a Large-Break LOCA for the APR1400 Using the ATLAS

摘要

A thermal-hydraulic integral effect test facility, ATLAS (Advanced Thermal-hydraulic Test Loop for Accident Simulation), has been constructed at KAERI (Korea Atomic Energy Research Institute). It is a 1/2 reduced height and 1/288 volume scaled test facility based on the design features of the APR1400, an evolutionary pressurized water reactor developed by the Korean industry. After intensive performance tests had been conducted to verify its operational performance and controllability for major thermal hydraulic components, a set of integral effect tests on the reflood period of a large break LOCA (Loss of Coolant Accident) was performed by using the ATLAS. The present ATLAS Test No. 9 is one of separate effect reflood tests investigating the thermal-hydraulic characteristics during an entire reflood period to provide reliable data to help in validating the LBLOCA analysis methodology for the APR1400. The initial and boundary conditions were obtained by applying scaling ratios to the MARS simulation results. The decay heat and the ECC water flow rate from the safety injection tank were simulated from the start of the reflood period. The ECC water flow rate from the high pressure safety injection pump was 0.32 kg/s. The system pressure was fixed at around 0.1 MPa and the initial outer wall temperature was determined to be 205°C. The experimental results showed the typical thermal-hydraulic trends expected to occur during the reflood phase of the large-break LOCA scenario.