Argonne National Laboratory
Reduced Enrichment for Research and Test Reactors
Nuclear Engineering Division at Argonne
U.S. Department of Energy

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Abstracts and Available Papers Presented at the
2000 International RERTR Meeting

HEU/LEU-Conversion of BER II Successfully Finished

K. Haas, C.-O. Fischer, H. Krohn

Hahn-Meitner-Institut • Glienicker Straße 100 • D-14 109 Berlin


The BER II (Berliner Experimental Reactor) research reactor is a swimming pool type reactor located in Berlin, Germany. The reactor operates with a thermal power of 10 MW and is primarily used to produce neutrons for neutron scattering experiments.

The conversion from HEU- to LEU-fuel elements began in August, 1997. At the last RERTR-Meeting 1999 in Budapest, Hungary, Hahn-Meitner-Institut (HMI) presented a "Status Report" on the conversion of 10 HEU/LEU mixed cores. In February 2000, HMI finished the HEU/LEU-conversion. Hereby, the first pure LEU-standard-core went into operation.

Our second LEU-core just ends its operation at the end of July. The third LEU-core will be built up in the beginning of August. The average burn-up rate was improved from 50 - 55% (HEU) to 60 - 65% (LEU). Therefore, only 14 elements/year are now used instead of 28/year.

The following report describes our first steps in building pure LEU-cores from mixed HEU/LEU-cores, as well as our initial experience using the pure LEU-cores.

PDF version available
DOWNLOAD full paper in PDF format.

Dr. Karin Haas
Hahn-Meitner-Institut, Berlin GmbH
Glienicker Str. 100
D-14109 Berlin, Germany
Phone:  ++49-30-8062-2745
Fax:      ++49-30-8062-2082

2016 RERTR Meeting

The 2016 International RERTR Meeting (RERTR-2016) will take place in Belgium. Stay tuned for further details.

2015 RERTR Meeting

The 2015 International RERTR Meeting (RERTR-2015) took place in Seoul, Korea on Oct. 11-14, 2015.
For more information visit RERTR-2015.


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Last modified on July 29, 2008 11:34 +0200