对于鈾-水稠密柵格計算快中子倍增系数时,必須考虑穿出鈾块的快中子在相邻块中的倍增作用。本文应用以积分迁移理論为基础的处理中子“无定向运动”的方法,从理論上推导出計算平板状鈾-水柵格中快中子倍增系数的簡单公式。对不同厚度的鈾块及V_(H_2O)╱V_U的柵格进行了計算,計算結果和費因別尔格的半經驗公式及文献[3]的結果进行了比較。 For fast neutron multipliers for uranium-water dense grids, the multiplication of fast neutrons exiting the uranium block in adjacent blocks must be considered. In this paper, based on the theory of integral migration, a method of dealing with the “non-directional motion” of neutrons is deduced theoretically to derive a simple formula for calculating the fast neutron multiplication coefficient in a flat uranium-water grid. The uranium blocks and V_ (H_2O) ╱V_U grids with different thicknesses were calculated. The calculated results are compared with the semi-empirical formula of Feinberger and the results of [3].