Rocky Flats Plant – Building #371

AddressRocky Flats Environmental Technology Site, Hwy. 93, Golden 80402
QuadLouisville, 1965 (1979)
SectionS10 & 11; T2S, R70W
Elevationc. 6000
SourceHistoric Building Inventory Record #5JF1014.30, 1995, Colorado Historical Society.
Initialdate1999-01-07 00:00:00-07
HistoryBuilt by Frank Briscoe in 1981, this four-story ( two underground), 186,000 sq. ft. building housed the recovery and refining of plutonium metal and americium oxide laboratory. It is a rectangular building with windowless reinforced concrete walls on a reinforced concrete foundation. The reinforced concrete roof is flat and a one-story wing along the south side contains fixed single pane windows and an entrance ell. Building #371 was built to assume the operations from Building #776/777 to remove plutonium from residues and convert it into high-purity metal. It was operated on a pilot scale until 1983 when serious design and construction deficiencies were identified, hindering full-scale operations. These deficiencies were never fixed and recovery operations were terminated in 1986. In 1988, the pyrochemical processes also ceased.