Storing means tidying an object away with the intention of getting it out again. Storage, which offers the possibility of retrieving the object that was put away, is by nature reversible. English has a more precise term for this: 'interim storage'.
In the case of radioactive waste, storing means 'temporarily depositing radioactive material in a facility designed to guarantee its containment'. Storage implies that it will be monitored. It is not designed to be used indefinitely and should not be used because one does not know what else to do.
Storage has its virtues for the most radioactive material. Storing a high activity package for several decades reduces the amount of heat it releases.
If packages are only warm by the time they are buried, the disposal facilities to be built can be smaller and therefore less expensive. During the storage period, technology will have moved on. Better packages may have been developed. Waste incineration reactors capable of destroying the most toxic and difficult radioactive material may have appeared.
Industrial storage of the most radioactive material is already a reality, with many variants. In the US, spent fuel assemblies are stored at nuclear plants in cooling pools and dry silos. In Germany, Sweden and Switzerland, there are central facilities. In France, spent fuel assemblies and vitrified waste from reprocessing are grouped at Marcoule and La Hague. There are storage facilities in operation for every type of waste, particularly pools for spent fuel and ventilated shafts for vitrified high-level waste.
Storage can be built at ground level or tens of metres below ground in a hillside or mountainside. Ground-level storage generally consists of underground shafts or cells under a building, as at La Hague. These subsurface shafts and cells can been accessed by means of a network of galleries. There is a storage facility of this type at Oskarshamn in Sweden.
Storage appears to be an essential interim stage before the disposal of radioactive waste. In all cases the solutions are temporary, valid for a few decades. Research is being done into long-term storage designed to protect packages and make them retrievable for up to 300 years.
Waiting too long means placing the burden on future generations. The right balance needs to be struck; storage should not be seen as an alternative to disposal, as it is by the opponents of disposal who advocate long-term storage. Long-term storage would involve very careful monitoring, a heavy burden of maintenance, and an obligation to remove the waste at the end. It is not a satisfactory solution as far as our descendants are concerned. Used for too long, the best storage facility becomes the worst disposal facility. Will future generations give more attention to these installations than we give to the catacombs of Paris? The example in 2005 of the dramatic consequences of Hurricane Katrina, aggravated by the US authorities' negligence over the maintenance of the levees in New Orleans, urges caution.
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