Millstone 1 was a General Electric boiling water reactor shut down in November 1995 before being permanently closed in July 1998.
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and has a maximum power output of 2700 MWth. It has 2 steam generators,
and 4 reactor cooling pumps (RCP).
It is currently undergoing an upgrade to its safe shutdown system which already met NRC standards.
During its refueling outage in October 2006, it installed a new pressurizer.
Millstone 3 is a Westinghouse plant that started operating in 1986,
and has a maximum power output of 3411 MWth