Sigh. Storing nuclear waste is actually pretty cheap. After being removed from the reactor it is put into a pool for a while until it isn't so radioactive and then it is put into dry cask storage. Long term it can and should be stored in a deep geological repository like Finland is doing. A surcharge of 0.1 cent per KWh is applied to all nuclear power to pay for the decommissioning of reactors.
You mean how Finland is planning on doing. It's still not doing it.
> In March, Finland successfully completed the first test of its encapsulation plant, which, if finished, will become the world's first permanent underground storage facility for radioactive waste.
Unless the burnup is quite high the volume will be larger. I don't think there will not be large fuel rod bundles to handle as units. The carbon binder of the fuel compacts is subject to abrasion and will be contaminated with carbon-14. Worse, it comes along with this moderator, so one has to be concerned with criticality even after the cooled waste has been transferred to dry storage.
