[psychoslave]

Well the obvious way to unsure that these waste are not going to threat human lives in whatever long period of time is to not create them in the first place.

And not doing it is even easier than saying we could not produce them.

Note that I'm not antinuclear or collapsist. Maybe in 10000 years there will be so much progresses in ways we don't expect that this material could be turned easily into safe or even useful material for human beings.