Development of Coupled 2D/1D Whole Core Transport Calculation Code Based on DRAGON

DRAGON code can conduct 3D method of characteristics（MOC） heterogeneous core calculations by introducing a lot of approximations and multiple acceleration methods,but the computing memory and time are still unaffordable for present engineering application.The transport calculation code DRAGON_HEU which is developed based on the 2D MOC calculation module of DRAGON code employs a coupled planar MOC solution and axial diffusion solution scheme,2D full core heterogeneous pin MOC calculation and 1D homogeneous axial pin diffusion calculation are coupled through radial and axial leakage under the 3D coarse mesh finite difference（CMFD） global framework,in such way the whole core Pin-by-Pin calculation is achieved.DRAGON_HEU code is testified with the C5G7 3D extension benchmark.Numerical results demonstrate that DRAGON_HEU code can achieve good accuracy while saving a large amount of time.