High Quality Content by WIKIPEDIA articles In the 1950s, Dr. Rudolf Schulten - professor at RWTH Aachen University - was the originator of the pebble bed reactor design, which compacts silicon carbide-coated uranium granules into hard, billiard-ball-like spheres to be used as fuel for a new high temperature, helium-cooled type of nuclear reactor. The idea took root and in due course a 46 MW_th (megawatt thermal) experimental pebble bed reactor (the Arbeitsgemeinschaft Versuchsreaktor, or AVR) was built at the J lich Research Centre in J lich, West Germany. It operated successfully for 21 years but was shut down because the pebble fuel testing program came to a halt. Some of the last pebble fuel tested in the AVR was for a low enriched uranium (LEU) fuel cycle anticipated for use in the HTR-MODUL design by Interatom/SIEMENS.
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