Hybrid subgroup decomposition method for solving fine-group eigenvalue transport problems

作者：Yasseri Saam; Rahnema Farzad^*

来源：Annals of Nuclear Energy, 2014, 68: 136-145.

DOI：10.1016/j.anucene.2014.01.013

• Quasi transport theory
• Transport theory
• Multi-group theory
• Subgroup decomposition method
• Acceleration

In this paper, a new hybrid method for solving fine-group eigenvalue transport problems is developed. This method extends the subgroup decomposition method to efficiently couple a new coarse-group quasi transport theory with a set of fixed-source transport decomposition sweeps to obtain the fine-group transport solution. The advantages of the quasi transport theory are its high accuracy, straight-forward implementation and numerical stability. The hybrid method is analyzed for a 1D benchmark problem characteristic of boiling water reactors (BWR). It is shown that the method reproduces the fine-group transport solution with high accuracy while increasing the computational efficiency up to 12 times compared to direct fine-group transport calculations.

• 出版日期2014-6