Coupled analysis of YGN 3 and 4 single RCP locked rotor accident using MARS/MASTER

YGN 3 and 4 single reactor coolant pump (RCP) locked rotor accident is analyzed using the coupled multidimensional analysis system of reactor system thermal-hydraulics and core kinetics, MARS/MASTER. Three-dimensional core kinetics is analyzed using MASTER module and the reactor vessel thermalhydraulics is simulated using the multi-dimensional module of MARS while the other reactor systems are analyzed using the one-dimensional module of MARS. Transient calculations are performed for the three seconds delay assumption of loss of offsite power. Through the analysis of the results, it has been demonstrated that the MARS/MASTER coupled analysis system is capable of simulating the realistic response of the reactor system, and that the coupled transient analysis using MARS/MASTER can afford a feasible safety margin to minimum departure from nucleate boiling (MDNBR)