 Built to the extent of three reactors in the US and another four in South Korea, it was among the most successful Generation II+ designs.ABB Group bought Combustion Engineering in 1990 and introduced the System 80+, with a number of design changes and safety improvements.As part of a series of mergers, purchases and divestitures by ABB, in 2000 the design was purchased by Westinghouse Electric Company, who had itself been purchased in 1999 by British Nuclear Fuels Ltd (BNFL).