Abstract:
The overlapping coupling method was used for coupling the system code CATHARE（developed by CEA,EDF and Framatome） and the 3-D code TRIO
U（developed by CEA）,which were taken to analyze the steady state of a simplified model built in this paper.Several test calculations were taken before the coupling calculations,including the code error test,the coupling platform error test,verifying the result of analytical case,system calculation,TRIO
U calculation and calculations of other codes.The test calculation results are in well accordance with the results of coupling calculations through the coupling platform.Three different source domains（heat source,momentum source and heat transfer source） are also calculated using the coupling method,and compared with the results of CATHARE.The research indicated that the overlapping coupling method can be used to simulate the simplified model for the whole reactor system built in this paper.
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