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GENERATION III AND III+ NUCLEAR POWER PLANT DESIGNS

GENERATION III AND III+ NUCLEAR POWER PLANT DESIGNS. ACR-1000 (Advanced CANDU Reactor ). Dr. Şule Ergün Hacettepe University Department of Nuclear Engineering March 2008, Istanbul. Outline. CANDU Concept CANDU Development ACR-1000 Technical Description Conclusion. CANDU Concept.

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GENERATION III AND III+ NUCLEAR POWER PLANT DESIGNS

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  1. GENERATION III AND III+ NUCLEAR POWER PLANT DESIGNS ACR-1000 (Advanced CANDU Reactor) Dr. Şule Ergün Hacettepe University Department of Nuclear Engineering March 2008, Istanbul

  2. Outline • CANDU Concept • CANDU Development • ACR-1000 • Technical Description • Conclusion

  3. CANDU Concept Pressurized Heavy Water Reactor (CANadian Deterium Uranium)

  4. CANDU Development • CANDU6 • ACR-700 • ACR-1000

  5. CANDU Development • The CANDU Design: • Modular horizontal fuel channels • Simple fuel bundle design • Separated coolant from moderator • Cool, low pressure heavy watermoderator • On-power fuelling • Passive shutdown systems

  6. ACR-1000 • Low enriched fuel • Light water coolant • • Higher steam pressure • Smaller reactor core • • High capacity factor • Over 60year life • • Larger thermal margins

  7. ACR-1000 Evolution in Core Size CANFLEX Fuel Bundle

  8. ACR-1000 • Safety Enhancements • Enhanced passive safety • Factor of ten improvement in severe core damage frequency • Improved Construction • Shorter construction schedule • Reduce cost by 25% or more

  9. ACR-1000 • ECC System: • Initial injection from pressurizedECI tanks located insideReactor Building (RB) • Long Term Cooling (LTC)System provides pumpedrecovery • LTC System also providesmaintenance cooling afternormal shutdown

  10. ACR-1000 Frequency for internal events: ~ 3 x 10-7/ reactoryear

  11. ACR-1000 • Severe accident mitigation: • Passive Core Make-Up Tanks keep HTS full toassure thermosyphoning capability • Reserve Water System (RWS) supply by gravity toSGs provides inventory for long-termthermosyphoning • Passive make-up to HTS from ECI and RWS delayaccident progression • Passive make-up to moderator and calandria vaultfrom RWS delay accident progression • Passive spray system supplied from RWS delayscontainment failure

  12. Conclusion • The ACR-1000 innovations include: • A compact core design which reduces heavy water inventory and results in lower costs and reduced emissions • Use of light water as reactor coolant, resulting in reduction ofsystems for heavy water coolant cleanup and recovery and simplification of containment atmosphere cleanup systems • Use of low enriched uranium fuel, contained in advanced CANFLEX ACR fuel bundles

  13. Conclusion • Efficient means for burning other fuel types such as mixed oxides (MOX) and thorium fuels • Increased fuel safety margins • Improved plant thermal efficiency through use of higher pressures and higher temperatures in the coolant and steam supply systems • Enhanced accident resistance and core damage prevention features • Enhanced operability and maintainability

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