Safety analysis of the C-30 cask for advanced fuel

At Paks NPP, Hungary, the C-30 cask is used for the transport of the spent fuel assemblies from the at-reactor wet service pool to the interim storage facility, or for transport of assemblies between units. Its maximal capacity is 30 assemblies. Originally, it was licensed for fuel with no enrichment zoning, having nominal enrichment of 3.7%. Due to the introduction of the new, advanced fuel assemblies with higher enrichment, increasing of fuel burnup and the need of lower cooling times, there is a need for the licence to be modified. The subcriticality and shielding analysis for new fuels is presented. (author)