GENERATION III AND III+ NUCLEAR POWER PLANT DESIGNS
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Transcript of GENERATION III AND III+ NUCLEAR POWER PLANT DESIGNS
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GENERATION III AND III+ GENERATION III AND III+
NUCLEAR POWER PLANT DESIGNSNUCLEAR POWER PLANT DESIGNS
ACR-1000ACR-1000
(Advanced CANDU(Advanced CANDU Reactor Reactor))
Dr. Şule Ergün
Hacettepe University
Department of Nuclear Engineering
March 2008, Istanbul
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Outline
• CANDU Concept
• CANDU Development
• ACR-1000– Technical Description
• Conclusion
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CANDU Concept
Pressurized Heavy Water Reactor
(CANadian Deterium Uranium)
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•CANDU6
•ACR-700
•ACR-1000
CANDU Development
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CANDU Development
• The CANDU Design:– Modular horizontal fuel channels– Simple fuel bundle design– Separated coolant from moderator– Cool, low pressure heavy water moderator– On-power fuelling– Passive shutdown systems
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ACR-1000
• Low enriched fuel
• Light water coolant
• Higher steam pressure
• Smaller reactor core
• High capacity factor
• Over 60 year life
• Larger thermal margins
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ACR-1000
Evolution in Core Size
CANFLEX Fuel Bundle
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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
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ACR-1000
• ECC System:– Initial injection from
pressurized ECI tanks located inside Reactor Building (RB)
– Long Term Cooling (LTC) System provides pumped recovery
– LTC System also provides maintenance cooling after normal shutdown
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ACR-1000
Frequency for internal events:
~ 3 x 10-7/ reactor year
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ACR-1000• Severe accident mitigation:
– Passive Core Make-Up Tanks keep HTS full to assure thermosyphoning capability
– Reserve Water System (RWS) supply by gravity to SGs provides inventory for long-term thermosyphoning
– Passive make-up to HTS from ECI and RWS delay accident progression
– Passive make-up to moderator and calandria vault from RWS delay accident progression
– Passive spray system supplied from RWS delays containment failure
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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 of systems 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
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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