On February 14th 2014, a 55 gallon drum of nuclear waste blew up and contaminated over 30% of the holding area in the New Mexico desert. The explosion has been attributed to the substitute material being swapped for the normal kitty litter that had been used to mix with the nuclear waste.
The story is being mostly ignored by the Mainstream Media outlets, the LA Times did make a tiny attempt, you can read that story here http://www.latimes.com/nation/la-na-new-mexico-nuclear-dump-20160819-snap-story.html