Abstract:
The determinist approach adopted in CPR control rod drop accident (CRDA) analysis appears so conservative that restricts the continual improvement as well as development and research. To increase the safety margin of CRDA, three-dimensional analysis was conducted based on the coupled 3D neutronics/thermal-hydraulics of MANTA/SMART codes. The analysis process and results were compared with those of CPR method. According to the results, the three-dimensional CRDA analysis method based on MANTA/SMART codes is found to be feasible and reasonable, which is capable to reflect realistically and comprehensively the parameter characteristics during the transient. Besides, the three-dimensional method shows a great potentiality to increase the safety margin of CRDA.