The claims about costs that we see made by some developers are very optimistic and intended to make their technology seem more acceptable and economical than it really is. As I said, I don't think anybody really knows these costs, because these methods have not yet been perfected.
We also do not have experience with operating the repositories to the extent that we have these experiences. For example, in the waste isolation pilot plant in New Mexico in the United States, there was an accident that happened within 15 years of the waste site being commissioned. Dealing with that accident accident cost billions of dollars.
How do we account for these kinds of potentialities? Does the cost of waste storage include those potential accidents? The answer is no.