The water-water energetic reactor (WWER), or VVER (from Russian: водо-водяной энергетический реактор (ВВЭР), romanized: vodo-vodyanoi enyergeticheskiy reaktor) is a series of pressurized water reactor designs originally developed in the Soviet Union, and now Russia, by OKB Gidropress. The idea of such a reactor was proposed at the Kurchatov Institute by Savely Moiseevich Feinberg. VVER were originally developed before the 1970s, and have been continually updated.
