Calculation of the Cruciform Control Rod Worth

摘要

A new method of calculating the worth of cruciform control rods arranged in the D-lattice is presented. The lattice is divided into two regions: a transport region near the control rods, and a diffusion region removed from the rods. The neutron behavior in the former region is treated by collision probability method and in the latter by diffusion approximation. The prompt decay constants calculated by the present method are in very good agreement with ex-perimental data, which evidences the accuracy of the present method for evaluating cruciform control rod worth.