I have a brother-in-law who worked at Idaho national labs. That lab was tasked with figuring out how to deal with nuclear waste. He said that they knew how to deal with the waste by putting it in Glass somehow. But they wouldn’t tell anybody because it would do away with their jobs. I think there are something like 8000 people working there in Idaho Falls. These people needed their jobs to sustain the local economy and far beyond. Why would they want to find a solution? It wouldn’t be good for the budget.
It is called “vitrification” and the plant is being built at the Hanford Site in Washington State. It has been years since I’ve followed anything about it, but it always seemed to be having delays and huge cost over-runs.