Does anyone seriously believe that this nuclear waste will still be around in 10'000 years? Or even 1'000 years? It wouldn't even surprise me if that problem is gone already in 100 years or even less. If you look at the development of science in the past 100 years, I am really very confident that in 100 years, we will have tons of fancy uses for that nuclear waste; and if we don't, we'll have tons of fancy ways to make it harmless or to get rid of it.
It's also a mistake to believe that any human can make any useful thoughts about the future civilisation of in 10'000 years. Don't bother trying, you're not that smart, sorry. The future is more than capable of handling this.