and, alarmingly
> we know places where natural nuclear waste have been stable for extremely long. Stability is not an issue.
Just where can you store several swimming pool's worth of extreme poison for 200,000 years? "natural nuclear waste" is an entirely different thing from the several swiming pools worth of material that people seem to want to make every year. There is nowhere that stable.
You have to erect a signpost that can be read and understood, and believed for 200,000 years. That is an order of magnitude longer than we have had writing. How can that be done?