在轻水堆上用模拟机落棒法测量反应性时一种消除空间效应的方法

AN APPROACH TO ELIMINATE SPATIAL EFFECTS ON REACTIVITY MEASUREMENTS BY ROD DROP METHOD IN LIGHT WATER REACTORS

推出一种以实验为基础，引入理论计算空间通量畸变因子Ｋ的修正公式来消除模拟机落棒法测量反应性空间效应的方法。用两个实例验证了该方法的效果；与脉冲中子源法结果作了比较，符合很好。该修正公式用微机输入参数作在线运算，将使落棒法在保持原有优点的前提下获得满足工程需要的精度。还列举两种典型的Ｋ因子平面分布图来说明其分布的规律，指出寻找到Ｋ在０８至１２之间区域内放置探测器，可得到一次落棒小于±３％的实测精度，而不需作任何修正。

This paper presents an approach to eliminate spatial effects in rod drop method.A corrective formula involving a theoretical calculation of the deformative factor K of spatial flux is given. This approach is verified by two examples with corrective values compared in good agreement to measured values by “Pulse Neutron Source” method. This corrective formula can be used with on line micro computer with K factor as an input parameter. Therefore, rod drop method can keep its original advantages and reach high accuracy needed in engineering field. Also, in this paper, two typical examples of factor K distribution for plane graphic are given to illustrate regularity of distribution, and point out that there is a region of K between 0.8 to 1.2, putting detector on this region, the accuracy of 3% can be obtained in one time of rod drop without any corrections.