Verification of the accuracy of the higher order of neutron anisotropic scattering in the AGENT neutronics code system

Abstract Neutron anisotropic scattering method of the AGENT (Arbitrary GEometry Neutron Transport) reactor neutronics modeling system is verified with a few representative benchmark examples in comparison to MCNP6. Benchmark examples include various unit cell types, and the University of Utah 100 kWth TRIGA MARK-I reactor (UUTR). The effect of neutron anisotropic scattering is analyzed and visually assessed in showing that the AGENT anisotropic scattering of up to P5 order of Legendre expansion provide the expected agreements with MCNP6 and with the gained computational times.