Coupled Calculation of SPACE and FRAPTRAN

In this coupling scheme, FRAPTRAN deals with heat conduction including fuel deformation of single fuel rod and SPACE takes charge of calculation of all hydraulic cells and heat structures except for the fuel rod coupled with FRAPTRAN. FRAPTRAN has been converted into DLL and interlinked with SPACE to enhance the capability of fuel deformation analysis of SPACE. For the coupling of two codes, the interface variables were selected and synchronization function of two codes was also developed. In addition, to simplify the interface variables for the convective boundary condition such as HTC and bulk fluid temperature, the boundary condition of the heat conduction equation in FRAPTRAN has been modified by adding temporary heat flux as interface variable. From the results of verification test, it was found that the values of time-integrated surface heat flux calculated by FRAPTAN and SPACE were exactly consistent with each other.