Study on Neutron Amplification Factor of Fast-Zone in VENUS 1^# on Unidirectional Coupling Mode

VENUS 1^# was the first fast-thermal coupled accelerator driven sub-critical experimental facility of the world built by China Atomic Energy Institute-CIAE.In this paper,the leakage and net neutron yield of fast zone and leakage neutron spectrum driven by ²⁵²Cf,Am-Be and D-T neutron sources with different loading layers was calculated based on VENUS 1^# unidirectional coupling mode.The results show that,from the view of energy production and transmutation,there exists optimized fuel loadings of fast-zone,which will provide theoretical basis for designing "fast-thermal" unidirectional coupling systems.