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CANDU Design:Overview
LM1Glenn Harvel
Associate ProfessorFaculty of Energy Systems and Nuclear
Science, UOITwww.uoit.nuclear.ca
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Learning Objectives• Fundamental Concept of the CANDU
Design
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DARLINGTON NPP
4X930MWe
Location;Darlington, OntarioCanada
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Qinshan – ocean cooled
Cernavoda – River cooled
Point Lepreau – Ocean cooled
Embalse – Lake cooled
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Typical CANDU Production Systems
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Fundamental Design Features of a CANDU
• Purpose of a CANDU– Generate electricity
• Use Natural Uranium Fuel– No requirement for enrichment plant
• On-Line Refuelling
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CANDU ReactorsStation Name Type Gross MWe Net MWe Start-upPickering A Pickering 542 515 1971Bruce A Bruce 904 (including
steam)848 1977
Point Lepreau CANDU 6 680 633 1983Gentilly-2 CANDU 6 675 638 1983Wolsong 1 CANDU 6 678 638 1983Embalse CANDU 6 648 600 1984Pickering B Pickering 540 516 1983Bruce B Bruce 915 860 1984Darlington A Darlington 936 881 1989Cernavoda 1 CANDU 6 710 665 1996Wolsong 2 CANDU 6 715 668 1997Wolsong 3&4 CANDU 6 715 668 1998Qinshan 1&2 CANDU 6 722 661 2003Cernavoda 2 CANDU 6 710 665 2007
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CANDU 6 Unit DataReactor Type 380 Horizontal Pressure TubesReactor Coolant Pressurized Heavy WaterModerator Heavy WaterFuel Compact and Sintered Natural UO2
Form 37 element fuel bundleBundle Length and Outside
DiameterL = 495 mm; O.D. =102.4 mm
Bundle Weight 23.5 kg (includes 2.1 kg Zircaloy)Bundles per Fuel Channel 12Outlet Header Pressure (gauge) 9.9 MPaOutlet temperature 310 °CCoolant Flow 8600 kg/sSteam Generators 4, Vertical U-tube with integral steam drum and preheaterSteam temperature 268 °CSteam Pressure (gauge) 4.7 MPaSteam Quality 99.75%Pumps 4, Vertical Centrifugal single suction double discharge
Net Heat to Turbine 2064 MWth
Electrical Output (gross) 725 MWe (typ. For 18C Cooling Water)
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CANDU Fuel
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Calandria Structure – Side View
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Fuel – Heart of the Reactor
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Calandria Structure – CANDU 6
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Nuclear Steam Supply
(Primary Heat Transport System, Reactor Core,
Moderator System)
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Pressure and Inventory Control
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Shutdown Cooling System
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HTS Purification
System
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Moderator System
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Secondary Heat Transport System
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Main Steam Supply
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Feedwater System
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Fuel Handling System
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Fuel Transfer System
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Next Steps• Detailed Lecture Notes
– PDF lecture manual– Simulator exercises for practice
• CANDU 9 Simulator– Simulates current CANDU technology– Good for overall understanding of plant
operations• ACR-700 Simulator
– Simulates future CANDU concepts.– Includes more accident scenarios
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Next StepsCANDU-9 and ACR-700 Simulator– Practise power maneuvers for Normal
Operation Conditions– Understand basic faults
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