Urea at NSA Utah Data Center

There are two spaces labeled "Urea Tank Room" in the NSA Utah Data Center's Generator Plant shown in construction drawings recently leaked: http://cryptome.org/2013-info/07/nsa-utah-dc/nsa-utah-dc.htm See Generator Plant floor plan drawing 11.2 A101 at bottom and top left, spaces labeled "UT." Urea is used in fuel cells. Are there other uses of urea in generator or data processing equipment?