Considering the potential safety hazards in the current concept design of accelerator driven nuclear system, sub-critical verification facility with auxiliary shut-down system is designed in this paper by using MCNP code. The core parameters can be adjusted by changing thermal zone pitch; the thickness of thermal area and the inserting depth of control rod, and simulation calculation and comparative analysis of multiplication factor is carried out, and keff can be modulated under various parameters. Finally, the shut-down margin and control rode effectiveness for different thermal pitches and ...
