Abstract
The OECD/NEA ATLAS project conducted a 1% top head break LOCA experiment to analyze the accident progression with the suggested accident mitigation plan. The RELAP5 simulation to validate its capability against ATLAS experimental data was performed. The simulation includes the pre-and post-test calculation to see the user dependency and reduce the discrepancy between the simulation and experiment. In post-test calculation, the sensitivity studies in terms of discharge coefficient at the break, break line modeling, environmental heat loss on the secondary side, and CCFL at Fuel Alignment Plate were conducted. Factors improving the simulation results in terms of total integrated mass from break and timings of accident management were found. The shortcoming of RELAP5 capability in predicting the downcomer level and Loop Seal Clearance timing was identified.
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