基于ADI的一种堆芯物理实时仿真算法

An Arithmetic for Core Physics Real-time Simulation Based on ADI

针对传统的交替方向隐式(ADI)方法求解中子扩散方程,在仿真中难以满足实时性要求这一问题,提出了以组件为单位划分网格以保证计算速度,并通过对ADI方法进行调整,引入调整因子使扩散方程强制守恒。为了验证该方法的可行性,以秦山二期核电厂为对象建立了仿真模型,结果表明,调整后的ADI方法能够满足计算精度和速度要求,可以用于反应堆堆芯物理实时仿真。本文结合在线校正技术对仿真结果进行在线校正,实现了在线仿真。

In the core physics real-time simulation,the traditional Alternative Direction Implicit（ADI） method for solving the neutron diffusion equations requires too much calculation time to meet the real-time demand.In this paper,one fuel assembly is considered as one mesh-cell in radial direction to reduce the calculation time;the adjusting factor is added to the finite difference equations to improve the calculation accuracy.The calculation accuracy and speed are tested by its application to the core physics real-time simulation for Qin Shan NPP PHASE II.The simulation result shows that this approach is applicable for the core physics real-time simulation.With online correction technology,the online real-time simulation is accomplished.