VVER-1200 is the latest evolution of VVER design. The safety philosophy embodied in the VVER-1200 is unique among reactors on the market in deploying a combination of both active and passive systems to provide fundamental safety functions. The VVER-1200 design takes account of Design Extension Conditions, in accordance with the current IAEA safety standard. Thus all new VVER-1200 plants under construction already have design features that take fully into account the main Fukushima lessons learned, including: long term cooling of reactor core without electrical power, long term decay heat removal that does not rely on primary ultimate heat sink, protection of reactor containment integrity with dedicated systems after a core meltdown accident.
The safety systems are designed to have the capability for stable operation under adverse conditions such as earthquakes, floods, storm winds, hurricanes, snowfalls, tornadoes, fire, low and high extremes of temperature, and even aircraft crash. Fisrt nuclear power units with VVER-1200 reactor was commisioned at Novovoronezh II NPP. New units are under construction are in Russia at Leningrad II NPP, Novovoronezh II NPP, Baltic NPP, and at Belorussian NPP in Belarus. Thsi design is also to be implemented at Hanhikivi-1 NPP in Finland, Paks NPP Units 5-6 in Hungary, and Akkuyu NPP Units 1-4 in Turkey, and Rooppur NPP in Bangladesh.
Developed by ROSATOM Corporation, VVER is a pressurized water reactor, which is among the world’s most widely used reactors. VVER proved its high reliability over more than 1,300 reactor-years of VVER nuclear plants operation. Today there are 56 VVER reactors operating in 11 countries. Since the commissioning of the first VVER power unit in 1960s the technology has been providing safe and affordable electricity throughout the world: from Armenian mountains to the countryside of the Czech Republic, above the Arctic Circle and at the southern tip of India.