Abstract
NECP-Hydra is a three-dimensional high-performance parallel code for reactor core analysis and radiation shielding calculation. This paper summarizes its main features and carries out some verifications. NECP-Hydra empolys finite difference and discrete ordinates for spatial and angular discretization respectively, and it supports both rectangular and cylindrical geometry. The parallelization calculation was performed by the Koch-Baker-Alcouffe (KBA) algorithm based on domain decomposition. Besides existing four-octant sweep (FOS) scheme, a diagonal-octant sweep (DOS) scheme is proposed to further improve the efficiency for the problems with reflective boundaries. Moreover, acceleration methods such as parallel mesh-corner DSA acceleration, inner-group GMRES and multi-group GMRES are also implemented in the code to reduce the computational time. Additional function like continuing computation with surface source for coupling with Monte-Carlo code is also implemented. Finally, we present some numerical results for evaluating NECP-Hydra’s accuracy, efficiency and its preformance in practical analysis of reactors, from which we can draw a conclusion that NECP-Hydra achieves both high accuracy and efficiency throughout these verifications.
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