Compact sodium-cooled nuclear reactor plant in the Research Centre Karlsruhe, fast sodium-cooled reactor with an electric gross output of 21 MW. The reactor was put into operation as a thermal reactor under the name KNK-I. Following the conversion to a fast reactor, it was operated under the name KNK-II from 10th Oct. 1977 onwards. On 23rd Aug. 1991 it was definitely shut down. The decommissioning work commenced in 1993 and is to be completed with the "green meadow" condition