Abstracts and Available Papers Presented at the
1998 International RERTR Meeting
Status of the Conversion of BER II after Seven HEU/LEU-Mixed-Cores
K. Haas, C.-O. Fischer, H. Krohn
Hahn-Meitner-Institut Glienicker Straße 100 D-14 109 Berlin
Hahn-Meitner-Institut presented an overview concerning the
HEU/LEU-conversion at the 15. RERTR-Meeting. Our last report at the 20. RERTR-Meeting
dealt with the successful operation of the first mixed core.
Up to now, seven different HEU/LEU-mixed cores have been in operation. 21 standard fuel elements were replaced by 14 LEU standard fuel elements and 7 beryllium reflector elements. Four control elements were changed from HEU to LEU. In the sixth mixed core, the absorber material was changed from AgInCd to Hafnium. The reactivity of all control rods was increased from 13.5% Dk/k to 16.5% Dk/k.
Reducing the power to 9.5 MW was necessary for the first mixed core. The sixth mixed core also required a reduction in power. Because of the hot channel, which was situated in a fresh LEU control fuel element, the power had to be limited to 7 MW, and the distorted control rod positions had to be reduced, too.
The next mixed core began its successful operation in September. The maximum power of 10 MW was reached again.
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