Just out of curiousity, if that was basically the "initial plan" for Yucca mountain, what did the plan eventually become?
The sad thing is that you don't need a lot of 'high security' around a cave filled with vitrified nuclear waste, you can't use the glass for anything useful. But you do if your cave is filled with casks that can be opened and the contents removed and then aggregated into piles, or wrapped around a truck bomb to be distributed by detonating the now 'dirty' bomb.