Are radioactive nuclear wastes stored in airtight containers made out of glass?

Answer 1

The idea is to actually incorporate the waste into the glass rather than a container made of glass. This would make a stable mass of glass-like material which would last for thousands of years without the active material leaching out, though we would still want to store it somewhere without risk of flooding.

To easily summarize the last response above me, that would be a yes, just for simplification.

The plan was to mix long half life wastes into molten glass until throughly blended then cast the glass into cylinders. The solid glass cylinders were to be clad in steel, these glass filled steel cylinders were then to be placed individually in steel shipping casks designed to take a direct collision with a freight train at top speed without rupturing.

It is all kind of irrelevant now as the US has eliminated all long term waste disposal sites from the list and have ceased looking for new options. We are just going to end up filling all the reactor spent fuel rod storage Swimming Pools, then shut down all the reactors (which is what the anti-nuclear groups planned all along).