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Introduction

ADVANCED SODIUM COOLED FAST REACTOR BN -1800 V. Poplavsky . А. Tsiboulya . А. Ка maev ( IPPE. Obninsk ) B . Vasiliev . Yu . Ка manin . А. Т imofeev (ОК B М . N.Novgorod ) V . Е rshov . К. Suknev ( SPb А EP. St. Petersburg ). Introduction. Mastering and development of SFR :

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Introduction

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  1. ADVANCEDSODIUM COOLED FAST REACTORBN -1800V. Poplavsky. А. Tsiboulya. А. Каmaev(IPPE. Obninsk)B. Vasiliev. Yu. Каmanin. А. Тimofeev(ОКBМ. N.Novgorod)V. Еrshov. К. Suknev(SPbАEP.St. Petersburg)

  2. Introduction Mastering and development of SFR: • implementationBN-350 BN-600 BN-800 1000 МWth 1470 МWth 2100 МWth 1973-1998 1980 Under construction • Design BMN-170 BN-600М BN-1600 studies400 МWth 1520 МWth 3850 МWth

  3. BN-800 - Achievement of up-to-date safety level; - Implementation of the fuel cycle based onmixed uranium-plutonium and demonstration of its closure and MA incineration • Key tasks of new designs • Advanced BN • Assurance of competitiveness with further safety improvement • Commercial implementation of advanced fuel cycle

  4. Basic areas of development • Max use of gained experience (pool type reactor design. three-circuit heat removal system. design of the main components) • Increase of unit power up to 1800 MWe (taking into account trends in the development of thermal reactor design etc.) • Increase of thermal efficiency up to ~ 46 % • Decrease of the number of systems and components • Aiming at high efficiency fuel cycle using high density fuel

  5. Choice of power unit parameters I circuitIIcircuitEfficiency Phenix* 560/400°С 512/246°С(17.7МPa) 44.5/42.4% Super- Phenix 545/395°С 487/237°С (18.2МPа) 41.5/39.5% EFR 545-395°C 490/240°C (18.4МPа) 41.7/39.6% BN-600* 550/377°С 505/240°С (13.7МPа) 42.5/40% BN-800 547/354°С 490/210°С (13.7МPа) 41.9/38.8% BN-1800* 575/410°С 525/270°С (25МPа) 46.2/44.5% * - steam reheat by sodium

  6. Reasons for adoption of high parameters • mastered technology of the third circuit (fossil fuel plants) • successful operating experience of Phenix and BN-600 reactors • possibility of introduction of Cr16Ni11Мo3steel for high temperature structures instead ofCr18Ni9 steel Tasks related to assurance of high parameters • development of high temperature radiation resistant steel for the fuel element cladding • development of SG design for supercritical parameters

  7. Mainarrangement approaches • all primary components and systems are located in the reactor • vessel( =17m): • · З primary pumps+ 6 IHX (common suction header) • · 2 cold traps cooled by nitrogen • · sodium quality control devices • number of secondary loops (and SG) - 6 (bellows) • DHRS – Air heat exchangersconnected to each secondary loop with continuously operating EM pumps • number of turbine generators - 1

  8. 1 - reactor; 2 -IHX; 3 – pressure compensator; 4 – hydraulic lock; 5 – primary pump; 6 – EM pump; 7 – air heat exchanger; 8 – steam generator; 9 - reheater; 10 – secondary pump; 11 – cold trap; 12 – water heat exchanger BN-1800:flow diagram

  9. Main components • Primary pumps (3) – centrifugal, submerged design, 7.8МW • Secondary pumps (6) - centrifugal, submerged design, 2.3МW • IHX (6) – counter-flow design with tube bends for thermal expansion compensation • CRDM (19 CR, 13 SR. 5 PSR) – electromechanical design • SG (6 EV-SH +6 RH) – counter-flow, straight-tube design The most important goal of components development is to assure max life time and min repair work with high reliability (for the plant: 60 years life time, load factor  0.9)

  10. BN-1800 reactor

  11. BN-1800 reactor

  12. Reactor core • Pancake type (Н=0.8m; D=5.2m) with the upper sodium plenum • Nitride fuel. Fuel element8.6х0.55 mm. SA 184х3.5 mm • Single enrichment (~15% Pu+MA in equilibrium state) • qemax=41/30 kW/m (468 SA/174 SA) • Тобmax=3(4)х500 ef, days. Вmax=12.2% h.а. • Temperature and power reactivity effect = -0.9% . • Burn-up reactivity effect = -0.3% . SVRE = +0.2% • BR = 1 - 1.3 (withoutblanket – with blanket)

  13. Map of the BN-1800 reactor core

  14. Characteristics of steam generator

  15. Refueling system • Fresh fuel storage and cooling poolfor one reactor loading • In-vessel refueling system • · Straight type refueling mechanism • · L-type refueling mechanism • · vertical elevator • Ex-vessel refueling system (without fresh and spent fuel storage drums) • · SA transfer mechanismlocated on the rotating table • · cells for SA heating - 5 • · cells for SA washing - 3 • · inclinedelevator

  16. 1. Механизм перегрузки L - образного типа 2. Поворотные пробки 3. Колонна СУЗ 4. Механизм перегрузки прямого типа 5. Элеватор загрузки – выгрузки 6. Машина перегрузочная 7. Стол поворотный 8. Привод стола поворотного 9. Гнезда разогрева 10. Гнездо свинцовой отмывки 11. Гнезда паровой отмывки 12. Механизм извлечения защитной пробки 13. Механизм герметизации пеналов 14. Бассейн выдержки 15. Наклонный подъемник шахты выдачи 16. Поворотная печь 17. Наклонный подъемник склада свежего топлива 18. Склад свежего топлива 19. Реактор Refueling system of the BN-1800 reactor

  17. High safety assurance • design approaches adopted forthe BN-600 and BN-800 • assurance of passive operation of CRin case of temperature increase • improvement of DHRS reliability (permanent readiness state) • no primary sodium piping • improvement of confinement systems

  18. Metal consumptionof BN-1800 reactor plant,t/МWe

  19. BN-1800 power unit

  20. BN-1800 power unit

  21. Technical and economical characteristics of BN-1800

  22. Conclusion • BN-1800 reactor power unit meats requirements for breederof 21st century: * its economical characteristics are comparable with those ofVVER-1500 * it assures BR=1-1.3 and possibility of МА incineration * it assures highefficiency of non-proliferation(closed fuel cycle with МА) * it is characterized by high safety • Key areas of R&D work * development of new structural materials for the fuel element cladding and high density fuel element design * development of vessel-type steam generator design for supercritical parameters • Estimated design development period~7-10 years

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