Sweden has for many years collected the spent nuclear fuel originating from nuclear power plants. This fuel must at all times be kept under supervision to render a diversion impossible; this is of course due to the possibility to make weapons from the material. One idea is to keep the nuclear material in a repository deep under the ground; this is not only to keep the material safe from theft but also to have a safe long-time storage as respect to the environment. As yet, no country has taken a deep repository in use; therefore, there are no routines for how the safeguarding of the nuclear material will be implemented.
