Werkstoffentwicklung für schnellbrüter-brennelemente hoher abbrände

Zusammenfassung This paper reports on the results of development work done at Kernforschungszentrum Karlsruhe in cooperation with Interatom and ARBED-Saarstahl on materials for LMFBR fuel elements of high burn-up. The swelling resistance of the reference material for the prototype reactor SNR-300, the austenitic steel 1.4970, has been optimized by variation of minor alloying elements. An even higher swelling resistance has been found in heavy ion irradiations for a new class of austenitic steels, characterized by chromium and nickel contents of around 9 and 25 wt%, respectively. Finally, very promising results have been obtained with an optimized 12% CrMoVNb martensitic steel intended for wrapper application.