Exploitable results
The nuclear power plant Rheinsberg (KKR) was closed down in 1990. Until that time there did not exist any procedures for the unrestricted release of materials out of the controlled area. The type of KKR wastes and its nuclide composition are different compared to Western light water reactors. For further development of an existing release measurement facility (RMF) different types of materials out of the controlled areas were measured with the RMF. The measuring of KKR in autumn 1992 lasted about 2 months. Afterwards 34% of about 100 Mg measured material in total could be declared as releasable, but some types of wastes could be released up to 90%.
In 1996 the results of the measurements have been discussed with experts and licensing authorities again. Some of the conservative assumptions concerning the nuclide mixtures for the release measurements could be refuted and new clearence levels have been defined, so that nearly 90% of all the material could be released as free.
Since starting in1988, about 3500 g of different materials have been measured by the RMF within 25 measuring campaigns in Germany. About 90% were released for direct reuse.
The NIS concept of gross gamma measurements for release of materials was represented to experts and licensing authorities in other European countries.
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