That's refreshing. I always like to see a good Homer attitude: "I didn't learn anything." You would think that the sight of all those rusty barrels being crushed by salt would mean something, but no.
Now, I don't believe there should be any great difference between 'low level waste', and used fuel, except the fuel radiates heat. This causes problems in highly stressed rock, and salt. In Swedish leaky granite, it probably opens up the water channels. When we used to actually model these things, it was the heat that was problematic.