Abstract
This research aims at investigating the instability phenomena on the power-flow operating map of Lungmen nuclear power plant (NPP). Lungmen NPP is the first ABWR (Advanced Boiling Water Reactor) and under construction in Taiwan. It consists of two identical units with 3926 MWt rated thermal power and 52.2×106 kg/hr rated core flow. In this research, decay ratios (the stability index) are calculated by LAPUR6. LAPUR6 is an analyzing core instability computer code based on the frequency domain approach. Before investigating the stability on Lungmen NPP operating map, some additional state points are carried out for validating with the SIRIUS-F experimental data. LAPUR6 results are consistent with the SIRIUS-F experimental data. Besides, LAPUR6 results of Lungmen NPP operating map show that the Lungmen NPP will not encounter core-wide or regional instability under normal operating or RIP trip event.
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