The fuel system was located in sealed cells, laid out for maintenance with long-handled tools through openings in the top shielding. A tank of LiF-BeF2 salt was used to flush the fuel circulating system before and after maintenance. In a cell adjacent to the reactor was a simple facility for bubbling gas through the fuel or flush salt: H2-hydrogen fluoride to remove oxide, fluorine to remove uranium as uranium hexafluoride. Haubenreich and Engel, Robertson, and Lindauer provide more detailed descriptions of the reactor and processing plant.