Abstract
PANGU code is a modern computer code for the physics analysis of pebble-bed high temperature gas-cooled reactors (HTGRs). This paper presents the recent progress on the development of PANGU’s capability in three-dimensional (3D) whole-core neutronics calculations. Firstly, diffusion and SP3 solvers based on nodal Green function method (NGFM) have been developed for the 3D whole-core calculation. Secondly, the 3D discrete-ordinate (Sn) neutron transport solver with coarse mesh finite difference (CMFD) acceleration has been developed to provide reference solutions, as well as being used for pre-homogenization calculations. Thirdly, two methods have been proposed for treating the strong absorbers in the framework of 3D whole-core diffusion calculations. Finally, the performances of the newly developed methods and solvers are tested by typical numerical cases based on HTR-10.
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