3. DESCRIPTION OF PROGRAM OR FUNCTION
MURLI-CLUSTER is an integral transport theory code to obtain the physics characteristics (fluxes, reaction rates, etc.) of PHWR lattices which use rod clustered fuel assemblies. The actual cell is replaced by an equivalent cylindrical cell for the purpose of computation of fluxes. For a specified buckling, it computes the effective multiplication factor using few-group diffusion theory and a few-group collapsed set of cross sections.
The code can optionally be used to obtain the number densities of fissile, fertile and fission product nuclides as a function of exposure and to recalculate fluxes, reaction rates and k-effective at specified burnup steps.
A 27-group library is included. It is obtained by collapsing the 69-group WIMS library over a typical PHWR lattice spectrum. There are four pseudo fission products associated with the decay chains of uranium and plutonium in addition to Xe-135, Rh-105, Np-239, U-236, Am-241, Am-242, and Am-243. There is one lumped pseudo fission production also.