A CASK TAILORED TO A NPP NEEDS: THE TN 24 G FOR GÖSGEN, SWITZERLAND

When Kernkraftwerk Gosgen (KKG}, Switzerland, specified its needs for a dual purpose cask for spent fuel assemblies, it had to solve a complex equation: • Dry storage capacity for KKG would rely on Zwilag, the centralized interim storage facility created jointly by the four Swiss operators of NPP and would therefore have to comply with the storage specifications, • KKG wished to keep its options open with respect to sending its spent fuel to reprocessing, • KKG wished to minimize dose to operators and transport operations, As any NPP, KKG had to take into account its limitations in lifting capacity and in operating space for cask loading at the NPP. The specification it produced gave a tentative list of spent fuel assemblies that were to be loaded in the casks, complete with irradiation data and a drawing of the loading pool and access funnel.