> They have. Finland has built a disposal site: https://en.m.wikipedia.org/wiki/Onkalo_spent_nuclear_fuel_re....

> In 2012, a research group at the Royal Institute of Technology in Stockholm, Sweden, published research that suggests that the copper capsules of KBS-3 are not as corrosion-proof as SKB and Posiva claim. The research group led by Peter Szakálos estimated that the copper capsules would last only about 1,000 years, instead of the 100,000 years claimed by the companies. According to the research results, corrosion in pure copper advances at about one micrometre a year, whereas KBS-3 depends on a rate of corrosion that is a thousand times slower. Independent research conducted in Finland has supported the results of Szakálos's group.

I said "safely and permantently".

> Yucca mountain is not in a geologically active area

> Nevada ranks fourth in the nation for current seismic activity.[78] Earthquake databases (the Council of the National Seismic System Composite Catalogue and the Southern Great Basin Seismic Network) provide current and historical earthquake information. Analysis of the available data in 1996 indicates that, since 1976, there have been 621 seismic events of magnitude greater than 2.5 within a 50-mile (80 km) radius of Yucca Mountain.[78]

> DOE has stated that seismic and tectonic effects on the natural systems at Yucca Mountain will not significantly affect repository performance. Yucca Mountain lies in a region of ongoing tectonic deformation, but the deformation rates are too slow to significantly affect the mountain during the 10,000-year regulatory compliance period.

So there is tectonic deformation in the area, but everyone who has a stake in the projects believes it won't be a problem. To me that sounds like the believe that the Challenger's O-ring couldn't cause problems.

> After 10,000 years the uranium is no more radioactive than it was when it was dug out of the ground.

Which is why I only mentioned shorter timescales.

> And when Yucca mountain is filled the entrances are blocked by meters of concrete - even if canisters are somehow get compromised the uranium still needs to magically get through several meters of rock and concrete to get out into the environment.

> The volcanic tuff at Yucca Mountain is appreciably fractured and movement of water through an aquifer below the waste repository is primarily through fractures.[73] While the fractures are usually confined to individual layers of tuff, the faults extend from the planned storage area all the way to the water table 600 to 1,500 ft (180 to 460 m) below the surface.[74] Future water transport from the surface to waste containers is likely to be dominated by fractures. There is evidence that surface water has been transported down through the 700 ft (210 m) of overburden to the exploratory tunnel at Yucca Mountain in less than 50 years.[75][76]
> The aquifer of Yucca Mountain drains to Amargosa Valley, home to over 1400 people and a number of endangered species.[2]
> Some site opponents assert that, after the predicted containment failure of the waste containers, these cracks may provide a route for movement of radioactive waste that dissolves in the water flowing downward from the desert surface.[77] Officials state that the waste containers will be stored in such a way as to minimize or even nearly eliminate this possibility.

We already know the waste containers degrade much faster than originally thought. There is a significant chance of contamination of the groundwater.