 As part of a collaboration with the U.S. Department of Energy 's National Nuclear Security Administration , Texas A & M completed the first conversion of a nuclear research reactor from using highly enriched uranium fuel ( 70 % ) to utilizing low @-@ enriched uranium ( 20 % ) . The eighteen @-@ month project ended on October 13 , 2006 , after the first ever refueling of the reactor , thus fulfilling a portion of U.S. President George W. Bush 's Global Nuclear Threat Reduction Initiative . 
