采用改进准静态近似与蒙特卡罗中子输运程序相结合(IQS/MC)的方法实现了加速器驱动的次临界系统(ADS)中子时空动力学模拟计算.以加速器驱动嬗变研究装置的靶堆耦合参考方案物理模型为例,通过对束流瞬变引入和燃料组件提升两种工况进行动态模拟,计算得到了堆芯总的相对功率、分能群相对中子注量率及相对功率三维网格分布随时间的变化.将IQS/MC方法计算结果与点堆计算结果进行了对比分析,模拟结果符合物理规律,两种方法对比结果与国外相关文献一致,表明IQS/MC方法适用于ADS次临界反应堆中子时空动力学过程的瞬态安全分析.%T he neutron time-space kinetics for accelerator driven sub-critical system (ADS ) was simulated by using improved quasi-static approximation combined with Monte Carlo neutron transport program (IQS/MC ) method . The physical model of accelerator driven system of target and reactor coupled reference scheme was regarded as an example ,the dynamics in two conditions of inserting beam and lifting fuel assembly were simulated ,and the core total relative power and three-dimensional gird distribu-tions of relative neutron fluence rate of energy group separated and relative power along with time were obtained .The calculation results of IQS/MC method and point reactor method were compared and analyzed ,the simulation results conform to physical laws ,and the comparative result of two methods is consistent with the foreign reference .The results show that IQS/MC method is suitable for transient security analysis of neutron time-space kinetics for ADS sub-critical reactor .
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