Domain Decomposition of Combinatorial Geometry Monte Carlo Simulation for Memory Overload Full-Core Nuclear Reactor

With the development of computer technology and the increasing requirement on nuclear reactor physics, the full-core reactor model contains too many cells and tallies to be loaded for Monte Carlo transport simulation on a single core processor. A domain decomposition of combinatorial geometry Monte Carlo transport is presented in this paper, to simulate the models overload the CPU memory. The tree-based decomposition and asynchronous communication of particle information between domains are also described in the paper. A full-core reactor model from Daya Bay nuclear power station is simulated to verify the domain decomposition algorithms. The domain decomposition provides an available way for the coupled transport and burn-up simulation of the full-core reactor model.