Pressurization transient analyses of the Lungmen ABWR plant using RETRAN-02 Original Research Article

The two limiting pressurization transient cases for the Lungmen ABWR plant: (1) Load Rejection with No Bypass and (2) Single Control Valve Closure in Fast Closure Mode, have been analyzed using the RETRAN-02 analysis model, which is independent of the model used by the NSSS vendor. The calculation results have been compared with those shown in the Lungmen FSAR. In general, the comparison shows that the transient response of key system parameters agrees well with the FSAR results, including those relating to core power, core inlet flow, system pressure, core inlet enthalpy, steam flow rate, feedwater flow rate, reactor water level, etc. Based on this, it is expected that the RETRAN-02 model developed in this study can be employed to support the operational transient analysis if the model is benchmarked further with the appropriate data, e.g., the Lungmen plant power test data, etc.