A series of experimental tests to simulate a reflood phase of a cold-leg LBLOCA of the APR1400 have been performed by using the ATLAS facility. This paper describes related experimental results with respect to the thermal-hydraulic behavior in the core and the system-core interactions during the reflood phase of cold-leg LBLOCA condition. The present descriptions will be focus on the LB-CL-09, LB-CL-11, LB-CL-14, and LB-CL-15 tests performed by using the ATLAS. The LB-CL-09 is the integral effect test with conservative boundary condition, and LB-CL-11, and -14 are the integral effect tests with realistic boundary condition, and the LB-CL-15 is the separated effect test. The objectives of these tests are to investigate the thermal-hydraulic behavior during an entire reflood phase, and to provide reliable experimental data for validating the LBLOCA analysis methodology for the APR1400. The initial and boundary conditions were obtained by applying scaling ratios to the MARS simulation results for the LBLOCA scenario of the APR1400. The ECC water flow rate from the safety injection tanks and the decay heat were simulated from the start of the reflood phase. The present experimental data showed that the cladding temperature behavior is closely related to the collapsed water level in the core and the downcomer.

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