As of Jan 1, 2013, 437 nuclear power plants were in operation and 64 under construction world-wide. Most of the nuclear power plants were equipped with light water reactors, i.e.→pressurized water reactors and →boiling water reactors.
Winfried Koelzer, Nuclear Terms, Karlsruher Institut for Technologie KIT (Ed.), ISBN German print version 2001: 3-923704-32-1, Translation by Informationskreis KernEnergie (Berlin), Karlsruhe, Germany 2013. https://www.euronuclear.org/info/encyclopedia/pdf/ Nuclear_Glossary-%202013-02-13.pdf, (Nucl Sfty - Amer) {1011}