The Plutonium Finishing Plant (PFP), also known as 'Z Plant', was part of the Hanford Site nuclear research complex in Washington, US.[1][2][3][4][5]
^"Plutonium Finishing Plant"(PDF). Hanford / US Govt. Archived from the original(PDF) on 2006-09-26. Retrieved 2009-01-20. "From 1949 to 1989, U.S. Department of Energy contractors operated the Plutonium Finishing Plant (PFP) to process plutonium nitrate solutions into a solid form (hockey puck-sized “buttons” or oxide powder) for shipment to the nation’s weapons production facilities."