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VVER Today: Evolution, Design, Safety 1

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VVER Today: Evolution, Design, Safety 1 State Atomic Energy Corporation ROSATOM 24 Bolshaya Ordynka street 119017 Moscow, Russia Tel.: +7 499 949 4535 Fax: +7 499 949 4679 E-mail: [email protected] www.rosatom.ru The VVER today Rusatom Overseas JSC Evolution | Design | Safety 29 Serebryanicheskaya embankment 109028 Moscow, Russia Tel.: +7 495 730 0873 Fax: +7 495 730 0874 E-mail: [email protected] www.rosatom-overseas.com THE VVER TODAY: EvOLUTION, DESIGN, SAFETY 1 EvOLUTION 4 A brief history of the VVER 8 FIRST VVER UNITS VVER-440 VVER-1000 - V-320 VVER-1000 - AES-91 & AES-92 VVER-1200 - AES-2006 VVER OF THE FUTURE – VVER-TOI DESIGN 14 Antecedents of the VVER-1200 (AES-2006) 18 VVER-1200 (AES-2006) design basics (SPbAEP version) 21 Main components of the VVER-1200 (AES-2006) plant 26 REACTOR PRESSURE VESSEL MAIN COOLANT PIPING REACTOR COOLANT PUMP STEAM GENERATOr PRESSURIZEr REACTOR CORE AND FUEL ASSEMBLIES TURBINE SAFETY 32 Safety requirements and principles 36 Provision of fundamental safety functions 37 CONTROL OF REACTIVITY DECAY HEAT REMOVAL CONTAINMENT OF RADIOACTIVE MATERIAL Protection from external impacts 43 Other advanced safety features and systems 44 SECURING POWER SUPPLY FIRE SAFETY VVER in the world.............................6 A brief history of the VVER..............8 First VVER units.................................8 VVER-440............................................8 VVER-1000 – V-320.........................10 VVER-1000 – AES-91 & AES-92.....11 VVER-1200 – AES-2006..................12 Evolution VVER of the future – VVER-TOI .....13 VVER IN THE WORLD 4 THE VVER TODAY: EvOLUTION, DESIGN, SAFETY VVER in the world.............................6 A brief history of the VVER..............8 First VVER units.................................8 VVER-440............................................8 VVER-1000 – V-320.........................10 VVER-1000 – AES-91 & AES-92.....11 VVER-1200 – AES-2006..................12 Evolution VVER of the future – VVER-TOI .....13 VVER IN THE WORLD THE VVER TODAY: EvOLUTION, DESIGN, SAFETY 5 ROSATOM’s VVER reactors are among the world’s most widely used reactors. VVER plants have proved their high reliability over more than 1300 reactor-years of operation. 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. VVER in the world 6 THE VVER TODAY: EvOLUTION, DESIGN, SAFETY The VVER reactor itself was developed by employing light water as coolant and moderator. ROSATOM subsidiary OKB Gidropress, while However there are some significant differences the nuclear power stations employing the VVER between the VVER and other PWR types, both in have been developed by the power plant design terms of design and materials used. Distinguishing organizations within ROSATOM: Moscow Atom- features of the VVER include the following: energoproekt, Saint-Petersburg Atomenergoproekt • Use of horizontal steam generators; (a branch of VNIPIET), and Nizhniy Novgorod • Use of hexagonal fuel assemblies; Atomenergoproekt. • Avoidance of bottom penetrations in the VVER The VVER is a pressurized water reactor (PWR), vessel; the commonest type of nuclear reactor worldwide, • Use of high-capacity pressurizers. THE VVER TODAY: EvOLUTION, DESIGN, SAFETY 7 A brief history of the VVER FIRST VVER UNITS A total of 67 VVER reactors have been constructed since the 1960s. The first VVER unit was commis- sioned in 1964, at Novovoronezh nuclear power plant, in the Voronezh region, Russia. The first unit was called the V-210, the second the V-365 (the num- bers were initially corresponding to electrical output). From that time the Novovoronezh nuclear power plant has been a testing ground for new VVER units. Today, ROSATOM continues the commitment to such an approach – export only the technology Novovoronezh 1, the world’s first VVER unit, gave the green light for which has been thoroughly tested at home. further technology development VVER-440 Successful commissioning and operation of these early units provided the basis for subsequent development of more powerful reactors. Implemented first at the same site, the VVER-440 was the first of the VVERs to be Two VVER-440 reactors in Armenia continued to operate through the 0.7g Spitak earthquake in 1988 8 THE VVER TODAY: EvOLUTION, DESIGN, SAFETY Novovoronezh 1, the world’s first VVER unit, gave the green light for further technology development Loviisa NPP in Finland, with two VVER-440 reactors, has one of the best lifetime performance records in the world constructed on a serial basis. VVER-440 units have These US criteria became the standard for all been safely operating in many European Union “Generation II” PWRs, and thus the safety features countries: Slovakia (Bohunice 1-4, Mohovce 1-2 ), of operating VVER-440 units and other PWR types Hungary (Paks 1-4), Bulgaria (Kozloduy 1-4), Czech of similar vintage are quite similar. Republic (Dukovany 1-4), and Finland (Loviisa 1-2). The reliability of the design is appreciated by Design of the Finnish Loviisa was completed in VVER-440 operating countries where regulators 1971-72 taking into account the General Design have approved the lifetime extension of the Criteria for Nuclear Power Plants, issued by operating plants for decades ahead. Large safety the US AEC in 1971. After that, all VVER plants margins in the VVER-440 design also provide the were designed to meet these safety principles. basis for safe and smooth uprate of these units. THE VVER TODAY: EvOLUTION, DESIGN, SAFETY 9 Two VVER-1000/V-320 reactors at the Temelin NPP in the Czech Republic provide 20% of the country’s electricity VVER-1000 – V-320 The VVER-1000 was a milestone not only in terms • ”small series” of four plants, commissioned in 1983-86; of generating capacity, but also because of the • ”standard series” of 23 units, commissioned in 1985-2011. many safety innovations it incorporated. The VVER- Design of these standard series VVER-1000 plants, 1000 is the most common VVER design worldwide, called the V-320, was completed in the early 31 units are in operation, and have amassed about 1980s, and implemented at 8 sites in Russia and 500 reactor-years of operation. Ukraine, as well as in Bulgaria (Kozloduy 5-6) and The operating VVER-1000 plants are generally Czech Republic (Temelin 1-2). The safety record of categorized in three broad groups as follows: VVER-1000 plants is good and there have been no • pilot plant, Novovoroneh 5, commissioned in 1980; incidents with significant safety impact. 10 THE VVER TODAY: EvOLUTION, DESIGN, SAFETY China’s Tianwan 1 and 2 are of the AES-91 type. Two more units are currently under construction VVER-1000 – AES-91 & AES-92 Drawing on the significant body of experience combination of passive and active safety systems. gained with the well established VVER-1000/V-320, Only small modifications were made in the basic the AES-91 (or VVER-1000/V-428) was developed power production systems – reactor, primary cool- by Saint-Petersburg Atomenergoproekt and the ing circuit, and turbine cycle. The main changes AES-92 (or VVER-1000/V-412 and 466) by Moscow were in the safety systems and plant lay-out. Atomenergoproekt. Along with upgraded tech- The AES-91 power plant with V-428 reactor, as nology and improved economics, these designs built at Tianwan, was an evolution from the AES-91 deployed the concept of BDBA (beyond design design initially proposed for Finland (but not basis accident) management based on a balanced constructed), which reflected Finnish regulatory THE VVER TODAY: EvOLUTION, DESIGN, SAFETY 11 requirements, operating experience with the Loviisa with the technical requirements of European VVER-440 units and international best practice. operating organizations (European Utility Require- The Tianwan AES-91 units, commissioned in 2007, ments (EUR)), was planned for the Belene site in were the first reactors in the world to have “core Bulgaria, but its construction was suspended. Two catchers” installed. AES-92 units are in start-up testing at Kudankulam, A plant of the AES-92 design, certified to conform India, where unit 1 achieved first criticality in 2013. Two units at Novovoronezh II (of the V-392M type) are among the six AES-2006 projects currently underway in Russia VVER-1200 – AES-2006 The AES-2006 design is the latest evolution in the (Novovoronezh II) and two units in the Kaliningrad long line of VVER plants. It meets all the interna- Region (Baltic project). In addition, construction tional safety requirements for Gen III+ nuclear contracts have been signed and site preparation power plants. The first AES-2006 units are now is ongoing for four units in Turkey and two units in under construction in Russia: two units in Sosnovyi Belarus. It is also proposed for Temelin 3-4 (Czech Bor (Leningrad II), two units in Novovoronezh Republic) and Hanhikivi 1 (Finland). 12 THE VVER TODAY: EvOLUTION, DESIGN, SAFETY VVER GENERATIONS GEN I GEN II GEN II/GEN III GEN III+ VVER VVER-440 VVER-1000 VVER-1200 V-210 V-179 V-187 V-392M RUSSIA: RUSSIA: RUSSIA: Novovoronezh 5 RUSSIA: Novovoronezh II 1-2 Novovoronezh 1 Novovoronezh 3-4 (under construction) (decommissioned) V-302 V-230 UKRAINE: South Ukraine 1 V-491 V-365 RUSSIA: Kola 1-2 RUSSIA: Baltic 1-2 RUSSIA: V-338 (under construction) Novovoronezh 2 Decommissioned: UKRAINE: South Ukraine 2 Leningrad II 1-2 (decommissioned) EAST GERMANY: RUSSIA: Kalinin 1-2 (under construction) Greifswald 1-4 BELARUS:
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