Nuclear entombment
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Entombment (also referred to as safe enclosure) of a nuclear reactor is a method of Nuclear decommissioning in which radioactive contaminants are encased in a structurally long-lived material, such as concrete, that will last for a period of time to ensure the remaining radioactivity is no longer of significant concern. The entombment structure is appropriately maintained and continued surveillance is carried out until the radioactivity is no longer a major concern, permitting decommissioning and ultimate unrestricted release of the property.
Whether or not the radioactivity is of 'major concern' is mostly an financial question. Highly contaminated sites can only be decommissioned using remotely operated tools, and this is often very expensive. After waiting a certain amount of years, the amount of short lived radioisotopes has significantly reduced, making the final decommissioning process also cheaper. At the same time, nuclear decommissioning funds, which are often collected during the operation of a nuclear power plant, have a possibility to collect interest, making more funds available for final decommission.
There are some public doubts on nuclear entombment, as it does not uphold the Polluter pays principle. It is often not possible to make an exact estimate of total decommissioning costs, leaving a certain financial liability for a future generation. It is also difficult to guarantee that the necessary expertise for final decommissioning will be available in due time, or that the decommissioning fund has earned sufficient interest.
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[edit] Examples
- Chernobyl, Ukraine - entombed in 'sarcophagus'.
- Lucens, Switzerland - entombed in mountain after accident.
- Dodewaard, the Netherlands - entombed for 40 years, awaiting final decommissioning. Also referred to as 'safe enclosure'.
