Russia. VVER-TOI reactor vessel of the first power unit was installed at Kursk II NPP in Russia. It weighs 340 tons and is made of nickel-free steel, which does not change its properties under the influence of radiation and high temperatures. Kursk II NPP will replace Kursk NPP units 1,2. The installed capacity of the VVER-TOI is 1255 MW, which is 25% higher than the one of VVER-1000, while the service life of the main equipment has been doubled. Another difference between VVER-TOI and the technology of the previous generation is the reduction in the cost and construction time, as well as operating costs. The design combines active and passive safety systems.