Application of high performance computing in lattice physics code VISWAM

We have developed a reactor physics lattice burnup code, VISWAM, for generating five group parametric database of LWR fuel assemblies. This database is used by core solvers that determine the neutronic characteristics of a nuclear power reactor. The sequential version of the VISWAM code used to take about ten days for generating the parametric database of all the fuel types of a particular reactor design. Subsequently, we developed a parallel version of the code using OpenMPI that reduced the time required for parametric database generation to a few hours. In this paper we give a brief description of the VISWAM code and the way parallel processing was used to speedup the code on a cluster.