Abstract: Criticality safety analysis was carried out for the container loaded with fresh CEFR-MOX fuel assemblies using MCNP code and ENDF/B-V nuclear data. Several factors including package arrays, container damages under hypothetical accident condition and water moderation conditions were taken into account in criticality safety analysis of the transport of fissile material. The results show that the subcritical limit in this case is 0.924 6; the maximum k_eff of infinite packages array under normal situation is 0.574 4 and the maximum k_eff of infinite packages array under accident situation is 0.659 7. The criticality safety index (CSI) of fresh CEFR-MOX fuel assembly transport package is 0.

Key words: fissile material transport, fresh CEFR-MOX fuel assembly, transport package, criticality safety analysis, criticality safety index