http://solari.com/blog/?p=2487#comments
Sorry I just followed the link - its the biggest pile of steaming poo I have ever read. Look, nuclear weapons grade waste is stored in flasks. These flasks are then stored in concrete, and this then encased in another flask.
If this material could eat through to the magma and cause a volcanoe, do you think it could be held inside a flask? even more to the point, do you think man could have a material that houses such a terror inside a reactor?