DuPont engineer George Graves had deviated from the Metallurgical Laboratory's original design in which the reactor had 1,500 tubes arranged in a circle, and had added an additional 504 tubes to fill in the corners.
Porén, o enxeñeiro de DuPont George Graves desviárase do deseño orixinal do Laboratorio Metalúrxico, no que o reactor tería 1 500 tubos dispostos nun círculo, engadindo outros 504 tubos adicionais para encher as esquinas.