Nuclear waste is still radioactive, although less-so and not as manageable currently than the current processes it is produced as a by product of, but permanently locking it into a place such as the Yucca Mountain nuclear waste repository is a waste, considering in the future we may be able to utilize the waste for more productive things.
Underground Nuclear Waste, no matter how deep, unless in a natural coal deposit, will saturate the environment. We are leaving our waste or social poop if you will, for our children to harvest. Saturation in a high saline solution is another alternative, or making more use of green energy
technologies would probably go a long way in taking care of the amount of nuclear waste that is generated annually.