The Embalse CANDU pressurized heavy water reactor (PHWR) is owned and operated by Nucleoeléctrica Argentina Sociedad Anónima (NASA). The single-unit CANDU 6 reactor has a gross output of 648 MWe. Construction started in 1976, and the Embalse plant began commercial operation in January 1984.
In December 1982, fuel loading began, and Embalse was declared in service on Jan. 20, 1984. As well as supplying electricity, Embalse is also used to produce Cobalt-60, a radioisotope used in medical and industrial applications.
In 2011, NASA signed a contract to retube the Embalse reactor, commonly called life extension. During this process, all 380 fuel channels and calandria tubes, along with the 760 feeder pipes, will be replaced, among other maintenance work. The life extension outage is currently scheduled to begin in early 2015.