改进准静态方法的研究

THE RESEARCH OF IMPROVED QUASI STATIC METHOD IN REACTOR KINETICS

处理反应堆三维动力学问题时，在时间方面采用了改进准静态方法，并加入了综合法改进，它通过对中子通量的因式分解，达到放大时间步长的目的，减少了进行空间计算的次数；在必要的空间计算中，该方法又利用了格林函数节块法的原理求解形状函数的空间分布，使空间网格距可以达到有限差分法的近二十倍。

To solve the three dimensional transient problems,the Improved Quasi Static Method(IQS)is adopted to deal with the temporal problem,and an improvement of synthesis method(YN) is also introduced.By factorizing the neutron flux,the time step of this method is enlarged so as to decrease the number of spatial calculations.For spatial calculations,Nodal Green′s Function Method(NGFM) is used to determine the distribution of shape function,so the spatial mesh of IQSYN/NGFM can be about twenty times as large as that of finite difference method.