Build fusion reactors. They can use the current supply of spent rods and convert it into non-dangerous waste. Fusion also produces more energy. And no, I'm not joking.

Take the current waste, pulversize it, mix it with concrete, pour the concrete into cubes about 3 meters on a side, and put them in the desert surrounded by a guarded and fenced perimeter. Let them sit there. I sort of suspect that someday humanity might well want radioactives for energy production.