@sun >there is nowhere to store it because nobody wants to store it near where they live.
It's simple - either reprocess it or bury it;
0. Choose a tectonically stable desert nobody cares about.
1. Dig a deep hole into the bedrock.
2. Throw the barrels down.
3. Fill with lots of rocks and cement.
4. Put warning sign on top with the expiry date (optional - literally nobody advanced enough to get past all that rock and concrete won't know what radioactive materials are).

If that's too hard - just throw the barrels into the ocean like the USA did and you'll still end up with less ecological damage than the shitloads of radioactive material released by burning the amount of coal required to get the same electrical output.