中文摘要：

针对现有加速器驱动核能系统概念设计中存在的安全隐患，采用MCNP程序设计了加装辅助停堆系统的次临界实验装置；通过改变热区栅距、热区厚度和控制棒的下插深度来改变堆芯参数，对反应堆有效增殖系数进行计算和比较分析，实现了不同堆芯参数下keff值可调；对几种不同热区栅距和热区燃料棒根数所对应的停堆深度和控制棒价值进行了计算，结果表明，辅助停堆系统提高了加速器驱动系统（ADS）的安全性。

英文摘要：

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 fuel numbers are calculated, and the calculation results show that auxiliary shut-down system improves the safety of the accelerator driven system.