Fuel Array Project for the Sub-critical Reactor of Accelerator Driven System Verification Facility

As the sub-critical reactor of the verification facility“Venus”of Accelerator Driven System, the fast-thermal coupling project is introduced in sub-critical core design.The fast neutron energy spectrum area is composed of natural metal uranium components;the thermal neutron energy spectrum area is com- posed of low-density uranium components.The critical calculation is carried out with Universe card and Fill card of 3-D Monte Carlo code（MCNP）.Based on the request of the verification facility（k_eff=0.90～1.00）,the core fuel grid of thermal area is schemed out.