VVER.1300TOI is a project of new III+ generation NPP with improved performance characteristics. The purpose is to achieve up-to-date safety and reliability characteristics at the same time as optimized capital investments for plant construction. The design provides for use of VVER reactor with electric power output of at least 1255 MW (and an option of uprating to 1300 MW). It is planned to achieve the following characteristics: availability factor – 93%, period between refueling – up to 18 months.

From the point of view of safety, the design implies observation of all requirements of Russian scientific and technical documentation, as well as maximum consideration for IAEA recommendations. The major distinguishing feature of the project is the use of additional passive safety systems in combination with traditional active systems. The design provides for protection against earthquake, tsunami, hurricane, aircraft impact. The examples of improvements are: double containment of the reactor hall; molten core catcher located under the reactor vessel; passive residual heat removal system. The design is developed on the basis of water-moderated water-cooled power reactor (VVER) plants, which have proved their reliability through one thousand reactor years of failure-free operation.

Several workgroups participate in the design preparation, including representatives of Engineering Division of ROSATOM, OKB Gidropress, OKBM, Kurchatov Institute, Rosenergoatom, VNIIAES, a number of other organizations and enterprises. This project is expected to implement the best solutions and experience accumulated during the development of Russian-built Kundakulam NPP (India) and Tianwan NPP (China).