I don’t mean to be an absolutists and say it could never under any circumstances leak if handled poorly, but even if you just dumped it in a hole in the ground the odds are against that.

We primarily don’t have long term storage for us becuase it’s too valuable and we’re only currently using a small percentage of its potential energy. In other words we are not done with it.

Long term storage that exists like Yucca Mountain are heavily engineered to remove risk.