MCDAN: a Monte Carlo computer code for calculating the Dancoff correction factor for spheres and rods

Abstract

MCDAN is a computer code that uses Monte Carlo techniques to calculate the Dancoff correction factor for arrays of spheres or rods. Neutrons are started from the surface of the sphere (rod) and tracked until they intersect another sphere (rod). The histories of a number of neutrons are statistically combined to give a value for the Dancoff correction factor. MCDAN was written as a tool to verify the accuracy of an expression for the Dancoff correction factor used in a study of the reactivity effect of fuel particles in uranium-water mixtures. The accuracy of MCDAN has been verified by comparison with tabulated data for systems of two spheres (rods).