Description: A description is given of a code for the IBM-704 computer which solves the few-group, time-independent, neutron-diffusion equations in x, y, z geometry. The number of lethargy groups may be one, two, three, or four, and the solution is obtained over a rectangular parallelepiped which is symmetric with respect to the plane x = y. A mesh of horizontal and vertical planes is imposed on this parallelepiped; all region interfaces must occur on mesh planes. Input parameters are specified regionwise, and completely variable mesh spacing is permitted. The number of mesh points on and to one side of the plane x = y is limited to 2675 and 4725 on 16,384-word and 32,768-word computers, respectively. Either a zero flux or a zero current boundary condition may be applied at each boundary limited to 2675 and 4725 on 16,384-word and 32,768-word computers, respectively. Either a zero flux or a zero current boundary condition may be applied at each boundary plane. The code was constructed to provide great ease of input preparation and simplicity of code operation. The running time of a typical two-group, 2600-point problem is 1.5 hours. (auth)
Date: October 1, 1959
Creator: Cadwell, W.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department