Nobody knows as much about the rock mechanics of waste storage, as myself. Yeah that it is all being ignored, because this is all a political exercise. The unfortunate part is that all the northern granite was glaciated with no cover. That means high-pressure water was injected everywhere, and this had the effect of cracking the rock down to about one klick.
Below this is the 'natural' stress of the rock which is so high that it cracks if you look at it. They are fixated on a certain way of disposal because they printed up all the literature, and it's wrong. However, it's something they have to go through. Good luck.