Abstract
This study performs an investigation of geometry homogenization simulation using MCNP5 v1.51 and SCALE6 on the HTR-10 criticality calculations and focusing on the impact of geometry homogenization on k eff and neutron spectrum. The data libraries employed in this work are both continuous ENDF/B-VI respectively in MCNP5 and SCALE6. Six models, which are Model 1 - heterogeneous model, Model 2 - TRISO coating and graphite matrix homogenized model, Model 3 - TRISO homogenized model, Model 4 - fuel zone of fuel ball homogenized model, Model 5 - fuel ball homogenized model, and Model 6 - core homogenized model, are performed correspondingly by using MCNP5 and SCALE6 on the homogeneous effect analysis in HTR-10. The results revealed that the differences of k eff between MCNP5 and SCALE6 are all less than 300 pcm. The small differences of k eff , neutron spectra, and also the consistent discrepancies of neutron spectra between each homogenized model (Model 2-6) and Model 1 show the good agreement of MCNP5 with SCALE6 in the geometry homogenization. © 2013 Elsevier B.V.