Study of transmission probability method based on triangle meshes

Transmission Probability Method based on triangle meshes is studied in this paper. The interior source is assumed to be isotropic in angular distribution and constant in spatial distribution. The surface angular flux is assumed to be with simplified 4P₁ approximation in angle and average in space. A new grid sweep process based on unstructured-mesh coding number is adopted. TPTRI program is encoded which can be applied to the solution of neutron transport of arbitrary two-dimensional geometry. Several benchmark problems are calculated and the results are compared with MG-MCNP3B, SURCU and TEPFEM programs. The numerical analyses show that the results of TPTRI are in good agreements with that from other programs.