基于单通道模型的ADS堆芯物理热工耦合计算

Neutronics and Thermal-hydraulics Coupled Calculation for ADS Based on Single-channel Model

摘要: 利用单通道模型，开发了铅铋冷却加速器驱动次临界系统(ADS)堆芯组件温度和密度分布的热工计算程序，并将该程序与MCNP耦合，建立了物理热工耦合计算方法。利用该方法计算了耦合后的功率及热工参数。结果表明，堆芯组件温度及冷却剂流速满足热工安全限值，堆芯径向功率不均匀系数较大，堆芯设计需进一步优化。

Abstract: A thermal-hydraulics code based on single-channel model was developed to calculate the temperature and density profile of fuel assemblies in the conceptual lead-bismuth cooled accelerator driven subcritical system (ADS). By coupling the code with MCNP, the neutronics and thermal-hydraulics coupled method was introduced, and the power and thermal-hydraulic parameters of the ADS were analyzed with the method. The result shows that the assembly temperature and the coolant velocity meet the requirements of the safety limits. However, the radial power nonuniform distribution factor is relatively large, so a further design is deserved.