TRIGLAV: A program package for TRIGA reactor calculations

An overview of the TRIGLAV package, a tool for the computational analysis of TRIGA Mark II reactors based on lattice transport code WIMSD for unit cell cross section homogenization and four-group diffusion theory in 2D cylindrical coordinates, is presented. Possible unit cells include four types of fuel elements and different non-fuel elements, such as water, graphite, control rod, etc. Apart from the calculation of the main parameters, i.e. the multiplication factor and neutron flux distribution, secondary parameters, such as fuel power and temperature distribution, xenon defect, etc., are also calculated. The program has been compared with the Monte Carlo code MCNP5. Some possible applications of the TRIGLAV program are also outlined in the paper.