[en] Description: This Working Material (including the attached CD-ROM) documents progress made in the IAEA's initiative to preserve knowledge in the fast reactor domain. The brochure describes briefly the context of the initiative and gives an introduction to the contents of the CD-ROM. In 2003/2004 a first focus of activity was concentrated on the preservation of knowledge related to the KNK-II experimental fast reactor in Karlsruhe, Germany. The urgency of this project was given by the impending physical destruction of the installation, including the office buildings. Important KNK-II documentation was brought to safety and preserved just in time. The CD-ROM contains the full texts of 264 technical and scientific documents describing research, development and operating experience gained with the KNK-II installation over a period of time from 1965 to 2002, extending through initial investigations, 17 years of rich operating experience, and final shutdown and decommissioning. The index to the documents on the CD-ROM is printed at the end of this booklet in chronological order and is accessible on the CD by subject index and chronological index. The CD-ROM contains in its root directory also the document 'fr_classification.pdf' which describes the classification system used for the present collection of documents on the fast reactor KNK-II. The present version contains in addition to the Archive prepared under the auspices of the IAEA also the power history from 23-08-1983 to 7-11-1987 and Measured values of the period 01-02-1990 to 29-11-1990. Measured value include: - mass-flow in primary circuit, - reactor Delta-T, - thermal power, - electric power, - Ionisation chamber counts after scram, - primary rod position, - primary circuit temperatures, - IHX temperatures, - water mass-flow, - steam generator water temperature, mass-flow, pressure, steam mass-flow, steam outlet, - burnup, - average temperatures for different positions, - outlet temperatures for different positions. Software requirements: Microsoft Office, Excel, Acrobat Reader, HTML Browser