page_title: BN-600 reactor
hierarchical_section_title: BN-600 reactor
caption_attribution_description: English: Main building of Beloyarsk Nuclear Power Station as seen from the Beloyarskoye Reservoir near Zarechny, Sverdlovsk Oblast, Russia. Beloyarsk has the largest fast breeder reactor (BN-600) of the world and is currently building another one (BN-800). As of 2007 it is the only commercial nuclear powerplant of the Urals and the oldest Russian commercial nuclear powerplant still in use. Besides the BN-600 it also has 2 older graphite reactors, which were shutdown in the 1980s and 1990s. Français&#160;: Le bâtiment principal de la centrale nucléaire de Beloyarsk (vu ici en 2005 à partir du lac-réservoir de Beloyarskoye) près Zarechny, dans l'oblast de Sverdlovsk, en Russie. La centrale de Beloyarsk intègre un réacteur à neutrons rapides (BN-600), le plus grand encore en fonctionnement dans le monde, et un autre est en construction (BN-800). En 2007, c'était la seule centrale nucléaire à vocation commerciale de l'Oural (et la plus ancienne encore en usage en Russie). Outre le BN-600 il dispose aussi de 2 réacteurs au graphite âgés, arrêtés dans les années 1980 et 1990
context_page_description: The BN-600 reactor is a sodium-cooled fast breeder reactor, built at the Beloyarsk Nuclear Power Station, in Zarechny, Sverdlovsk Oblast, Russia. Designed to generate electrical power of 600 MW in total, the plant dispatches 560 MW to the Middle Urals power grid. It has been in operation since 1980 and represents an evolution on the preceding BN-350 reactor. In 2014, its larger sister reactor, the BN-800 reactor began operation.
  The plant is a pool-type reactor, where the reactor, coolant pumps, intermediate heat exchangers and associated piping are all located in a common liquid sodium pool. The reactor system is housed in a concrete rectilinear building, and provided with filtration and gas containment features. In the first 15 years of operation, there have been 12 incidents involving sodium/water interactions from tube breaks in the steam generators, a sodium-air oxidation/"fire" from a leak in an auxiliary system, and a sodium "fire" from a leak in a secondary coolant loop while shut down. All these incidents were classified at the lowest level on the International Nuclear Event Scale, and none of the events prevented restarting operation of the facility after repairs.
context_section_description: The BN-600 reactor is a sodium-cooled fast breeder reactor, built at the Beloyarsk Nuclear Power Station, in Zarechny, Sverdlovsk Oblast, Russia. Designed to generate electrical power of 600 MW in total, the plant dispatches 560 MW to the Middle Urals power grid. It has been in operation since 1980 and represents an evolution on the preceding BN-350 reactor. In 2014, its larger sister reactor, the BN-800 reactor began operation.
  The plant is a pool-type reactor, where the reactor, coolant pumps, intermediate heat exchangers and associated piping are all located in a common liquid sodium pool. The reactor system is housed in a concrete rectilinear building, and provided with filtration and gas containment features. In the first 15 years of operation, there have been 12 incidents involving sodium/water interactions from tube breaks in the steam generators, a sodium-air oxidation/"fire" from a leak in an auxiliary system, and a sodium "fire" from a leak in a secondary coolant loop while shut down. All these incidents were classified at the lowest level on the International Nuclear Event Scale, and none of the events prevented restarting operation of the facility after repairs. As of 1997, there had been 27 sodium leaks, 14 of which resulted in sodium-air oxidations/"fires". The steam generators are separated in modules so they can be repaired without shutting down the reactor. As of 2013, the cumulative "energy Availability factor" recorded by the IAEA was 74.6%.
  The reactor core is 1.03 meters tall with a diameter of 2.05 meters. It has 369 fuel assemblies, mounted vertically, each consisting of 127 fuel rods enriched to between 17–26% ²³⁵U. In comparison, normal enrichment in other Russian reactors is between 3–4% ²³⁵U. The control and scram system comprises 27 reactivity control elements including 19 shimming rods, two automatic control rods, and six automatic emergency shut-down rods. On-power refueling equipment allows for charging the core with fresh fuel assemblies, repositioning and turning the fuel assemblies within the reactor, and changing control and scram system elements remotely.
  The unit employs a three-circuit coolant arrangement; sodium coolant circulates in both the primary and secondary circuits. Water and steam flow in the third circuit. The sodium is heated to a maximum of 550 °C in the reactor during normal operations. This heat is transferred from the reactor core via three independent circulation loops. Each comprises a primary sodium pump, two intermediate heat exchangers, a secondary sodium pump with an expansion tank located upstream, and an emergency pressure discharge tank. These feed a steam generator, which in turn supplies a condensing turbine that turns the generator.
  There is much international interest in the fast-breeder reactor at Beloyarsk. Japan has its own prototype fast-breeder reactors. Japan paid 1 billion for the technical documentation of the BN-600. The operation of the reactor is an international study in progress; Russia, France, Japan, and the United Kingdom currently participate.
  The reactor has been licensed to operate up to 2025.
caption: Main building of Beloyarsk Nuclear Power Station as seen from the Beloyarskoye Reservoir near Zarechny, Sverdlovsk Oblast, Russia. Beloyarsk has the largest fast breeder reactor, the (BN-600), at 600 MW it is the most powerful breeder in the world. Construction of a second breeder reactor, the BN-800 reactor, is completed.
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