 According to a 2001 report by the Federation of American Scientists, the MH-1A reactor had a total of five cores during its operational life.It used low-enriched uranium (LEU) in the range of 4 to 7 %, with a total amount of uranium-235 supplied being 541.4 kilograms (for the five cores).The "Sturgis" was eventually replaced by two 21 MW Hitachi turbines, one on the Pacific side of the isthmus and one on the Atlantic side.