GENERATION III AND III+
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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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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

Outline

  • CANDU Concept

  • CANDU Development

  • ACR-1000

    • Technical Description

  • Conclusion


Candu concept

CANDU Concept

Pressurized Heavy Water Reactor

(CANadian Deterium Uranium)


Candu development

CANDU Development

  • CANDU6

  • ACR-700

  • ACR-1000


Candu development1

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


Acr 1000

ACR-1000

  • Low enriched fuel

  • Light water coolant

  • • Higher steam pressure

  • Smaller reactor core

  • • High capacity factor

  • Over 60year life

  • • Larger thermal margins


Acr 10001

ACR-1000

Evolution in Core Size

CANFLEX Fuel Bundle


Acr 10002

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


Acr 10003

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


Acr 10004

ACR-1000

Frequency for internal events:

~ 3 x 10-7/ reactoryear


Acr 10005

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


Conclusion

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


Conclusion1

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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