"in fact, the jury’s still out on whether WIPP has solved the basics of the storage problem at all. In February of 2014, a leak was detected at WIPP which exposed several workers to radiation and WIPP has been closed since"
If you follow the link, you find gems such as
"The report states that it took 10 hours to respond to the initial emergency alarm, then a bypass in the filtration system allowed the radiation to escape above ground. “They failed to believe initial indications of the release,” said board chairman Ted Wyka. It also found that much of the operation failed to meet standards for a nuclear facility; a lack of proper safety training and emergency planning; lagging maintenance; and a lack of strategy for things like the placement of air monitors."
Given that we can't even keep such facilities safe while they're staffed and operated with the sole goal of providing safe storage, it seems pretty clear that waste storage is not, as nuclear power proponents like to claim, a "solved problem", and is in fact most likely unsolveable.
Nuclear technology is not, never was, and never will be safe. Because people are fallible, stupid and greedy.