Research of Neutron Characteristics of HFETR Irradiation Channels

This paper studied the neutron characteristics of the irradiation channels in High Flux Engineering Text Reactor（HFETR） by employing the MCNP programs as calculation tools, including the ratio of the neutron fluxes of E＞1.0 MeV（φE（29）1.0 MeV） to the neutron fluxes of E＞0.625 e V（φE（29）0.625 eV） within the different channels, the fast neutron flux ratio of the material farthest and nearest away from the core, and the optimum arranging height of the materials. The results indicate that the k within the different channels varies differently with the changing of the axial and radial locations. However the average varying extent is identical. For the fast neutron flux ratios of the material farthest and nearest away from the core, the 9# channel is bigger（1.43）, while the G7 and K11 channels are smaller（1.21 and 1.18 respectively）. Comprehensively speaking, the arrangement height of the materials can reach 500 mm for P15 channel, and for the 9# channel, it can reach 600 mm.