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本文探讨了水水反应堆中把元件棒组成元件盒后的非均匀栅内的热中子利用系数的计算方法,并讨论了元件盒内热中子通量分布的不均匀性。文中提出把热中子利用系数分解为盒内利用系数和元件棒利用系数两个因子。先用扩散理论或多次碰撞理论处理带覆盖层的均匀栅内的热中子利用系数,然后把盒内介质转化成相当的均匀介质,求出整个元件盒内的通量分布,计算盒内利用系数。最后利用所得计算公式计算了一个游泳池反应堆元件盒形的热中子利用系数和通量分布,并与按完全均匀栅计算得到的结果作了比较。
This paper discusses the calculation method of the thermal neutron utilization coefficient in the non-uniform grid after the component rods are assembled in a water-water reactor, and discusses the inhomogeneity of the thermal neutron flux distribution in the component box. In this paper, the thermal neutron utilization factor is proposed to be decomposed into two factors, namely, the utilization factor in the box and the utilization factor of the element rod. First use diffusion theory or multiple collision theory to treat the thermal neutron utilization coefficient in the uniform grid with covering layer, and then convert the medium in the box into a fairly homogeneous medium, find the flux distribution in the whole box, Utilization factor. At last, the thermal neutron utilization factor and flux distribution of a box element of a swimming pool reactor were calculated by the calculated formula and compared with the results calculated by a completely uniform grid.