RE: What France plans to do with its nuclear waste
They would then pour the molten glass into steel drums placed within steel barrels
Steel looks good new, and painted. But it will eventually rust and cause water to seep inside. And leak out radiation. A better container, would be one made of stainless steel. Costly but will probably last until this earth comes to an end. As far as shooting nuclear waste into the sun. As others have stated, all launches are not successful. And the sun is so hot, i doubt if a space vehicle. can get anywhere near the sun. If there was a safe way, to get it into space. Then a better option. Would be to launch it, into a planet. Mars or Venus would be a nice target. Scientist should find some type of way, to neutralize radioactive material. They shouldn't have a problem, with enough waste, to experiment with. There is more than enough.
