As a german I cannot confirm US rumours but in Germany. an experimental deposit setup in Asse ended in a desaster. The tons with the waste began to rot and release of material to ground water became an imminent danger. The whole setup had to be reverted and the waste recovered to prevent that.

But along with the problem to find technically suitable places there is the opposition of people. Everyone wants cheap energy, but no one wants nuclear waste in the vicinity of one's home.