Uprating a way of increasing nuclear power capacity

Uprating a way of increasing nuclear power capacity: http://www.eia.gov/todayinenergy/detail.cfm?id=7130 ..."Currently, there are 104 commercial nuclear reactors in the United States. In 2011, these plants provided 786 billion kilowatthours of electricity, or nearly one-fifth of total generation. The electrical output of the nuclear power plant fleet can be increased either by constructing new plants or by 'uprating' operating plants. Uprating generally involves physically modifying the plant to increase its generating capacity. Since 1977, more than 6,500 megawatts-electric (MWe) of nuclear uprates have been approved, and most of these have already been implemented. Through July 10, 2012, these cumulative uprates are roughly the equivalent of constructing six new nuclear power plants."