Valid points all, Mr.Joe. My thought is that sufficient encasements exit (and are curently planned for use in Yucca) to alleviate these concerns. I've seen documentaries ( Discovery channel, I think ) that indicate the containers have survived a collision with a locomotive without breach.
This would appear to be suffcient for at least several generations.
Worst case, Yucca would like the proving grounds in Nevada.
Which is OK in today's climate.
A couple of thousand years from now, if the roof leaks, so to speak, and the area gets significant rainfall, those hot containers might corrode away. I wouldn't want to be drinking from a well near that...
Not thinking this as an alarmist, but a responsible individual, and as a geologist.
The whole question could be rendered moot by anything from a pandemic to an impact to the Second Coming in that time frame, anyway.
Some of those isotopes are nasty stuff, though.
When I worked down that way, (on oil rigs), every now and then you'd see a blur of bird or something in the edge of the headlights while driving at night. We used to joke about "just another critter from the test site.."