Anyone done a cost analysis of maglev launch tube to achieve 66000+mph? Encase the nuclear waste in iron, magnetize it and place it into solar free-fall by launching into earth's orbital wake. Initial construction is certainly costly, but over time, perhaps you come out way ahead, and you avoid the pitfalls of earth-based, lunar or asteroid storage.
Better yet, save that launch tube idea for shooting at doomsday asteroids to break them up. Uranium does wonders for armored tanks. Imagine what a series of rods smashing into a comet or asteroid would do to softer materials at a combined speed of over 90,000mph! Maybe it'd be like taking a mini-gun to a chunk of concrete. With tiny speed and angle changes imparted in the last section of the launch tube, you could set up a bombardment pattern that fractures the asteroid and accelerates each part into different speeds and orbits, separating them enough to result in lower risk of the entire mass striking Earth, or perhaps even avoiding it altogether. If you run short of spent rods, just fill with lead. You might even consider coatings such as teflon, to cut friction losses and to help the rods pierce deeper into the asteroid, where they can have greater effect.
At least if you miss, your problems aren't going to be from the spent rods coming back to haunt you!!!