Due to the horror stories I've heard around these places, I've got a small question.
How powerful can nuclear explosions be? In particular, nuclear meltdowns?
While it's entirely possible to make entirely safe nuclear reactors, they don't exactly use their uranium cells to the maximum. I'd like to use several high power nuclear reactors, preferably MKIII and MKIV, in order to power some fairly large facilities.
Water's blast resistance is 500, and that has little effect. How thick would I need to make, say, an Obsidian wall to protect everything on the other side?