Development of High-Fidelity Neutron Transport Solver of Alpha

To achieve the high-fidelity and high-performance neutronics simulation of complex assemblies and whole-core problems, the lattice physics code ALPHA (Advanced Lattice Physics code based on Heterogeneous Architecture) is developed. ALPHA employs the planar method of characteristic (MOC) with the axial flux expansion (MOC-EX) scheme to perform 3D problems. The coarse mesh finite difference (CMFD) scheme is used to accelerate the transport sweeping numerically. The heterogeneous system architecture (HSA) has been a powerful tool to accelerate numerous scientific computing applications. Motivated by this, the transport solver of ALPHA is parallelized on the CPU/GPU heterogeneous platform. To exploit the computing capability of the GPU, some optimizations are investigated and implemented on MOC parallel algorithm. In this paper, the implementation, verification, and validation of the neutron transport solver built-in ALPHA are presented.