Abstract
Abstract The decommissioning is the final phase in the life cycle of a nuclear reactor. In case of finishing the operation after the foreseen lifetime the decommissioning is planned long-dated with regard to the options “immediate dismantling”, “safe enclosure” and “entombment”. In case of an accident the operational phase was mostly finished immediately depending from the possible options for managing the damaged facility. With regard to the accidents in the nuclear power plants Three Mile Island Unit 2 (USA), Lucens Experimental Reactor (Switzerland), A-1 (Slovakia) and Chernobyl-4 (Ukraine) this article presents a short description of these accidents and of the related decommissioning projects. The examples demonstrate that in principle these projects represent variations of the above mentioned options. It has, however, to be noted that the realisation of the entombment of the destroyed unit Chernobyl-4 is unique with regard to the essential high complexity related to the first and the second Sarcophagus.
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