As reported by the Detroit Free Press.
The article quotes Beyond Nuclear:
"This is the worst of the worst" waste, said Kevin Kamps, radioactive waste specialist with the nonprofit Beyond Nuclear, based in Takoma Park, Maryland.
"It’s highly radioactive irradiated nuclear fuel. It is dangerous forever."
...Another problem is transporting highly radioactive spent fuel to the site, Kamps said.
"Are they going to use barges on the Great Lakes? What if they sink?" he said.
"If not barges, are they going to use trains and trucks? What if they crash? What if they are attacked by terrorists? If there are releases, it's probably going into the lakes.
"You're talking about concentrating 22 reactors' worth of spent fuel. If you’re going to concentrate that much radioactivity in one place, terrorists might consider attacking it for the ultimate dirty bomb on the planet."