CANDU Safety #24 - CANDU 9 Design Overview Library/19990125.pdf · 2011-09-15 · 24/05/01 CANDU...

24/05/01 CANDU Safety - #24 -CANDU 9 Design Overview.ppt Rev. 0 vgs 1

CANDU SafetyCANDU Safety#24 #24 -- CANDU 9 Design OverviewCANDU 9 Design Overview

Dr. V.G. SnellDr. V.G. SnellDirectorDirector

Safety & LicensingSafety & Licensing


CANDU 9CANDU 9λλ CANDU 9 CANDU 9 -- a single unit design with output >935a single unit design with output >935 MWeMWeλλ optimized for multioptimized for multi--unit constructionunit constructionλλ based on Bruce B and Darlington, integrated 4 unit plants based on Bruce B and Darlington, integrated 4 unit plants

operating in Canadaoperating in Canadaλλ single unit features adapted from CANDU 6single unit features adapted from CANDU 6λλ CANDU 9 design improvements based on utility and industry CANDU 9 design improvements based on utility and industry

feedback and licensing experiencefeedback and licensing experience


CANDU 6 Bruce B Darlington CANDU 9

# of Fuel channels 380 480 480 480

Fuel Bundle 37 elements 37 elements 37 elements 37 elements

Reactor Coolant Pressure 9.9 MPa(g) 9.9 MPa(g) 9.9 MPa(g) 9.9 MPa(g)

Coolant Outlet Quality 4% 0.7% 2% 2%

Maximum Channel Flow 24 kg/s 24 kg/s 25.2 kg/s 25.2 kg/s

Number of reactor headers 8 6 8 6

Number of Coolant Pumps 4 4 4 4

Number of SteamGenerators

4 8 4 4

Steam Generator SurfaceArea

3200 m2 2400 m2 4900 m2 4900 m2

Power Output 715 MWe 915 MWe 936 MWe 945 MWe

Comparison with operating plants Comparison with operating plants


Two Unit LayoutTwo Unit Layout


Reactor BuildingReactor Building

λλ conventional dry containmentconventional dry containmentλλ prestressedprestressed concreteconcreteλλ steelsteel--linedlinedλλ no basementno basementλλ elevated Reserve Water Tank elevated Reserve Water Tank

for accidents instead of for accidents instead of dousing tankdousing tank


Feeder, header and pipe whip platformFeeder, header and pipe whip platform


Shield Cooling & End Shield Cooling SystemShield Cooling & End Shield Cooling Systemλλ elevated piping so that a leak in a elevated piping so that a leak in a

pipe does not drain the shield tankpipe does not drain the shield tankλλ connection to Reserve Water Tank connection to Reserve Water Tank

for severe accidentsfor severe accidents


Control CentreControl Centre


Control Centre LayoutControl Centre Layoutλλ Main Control RoomMain Control Room

–– work control area & computer hardware roomwork control area & computer hardware room–– Technical Support Centre & Emergency Operating CentreTechnical Support Centre & Emergency Operating Centre–– seismically qualified seismically qualified -- no need for operator to go to no need for operator to go to

Secondary Control Area following an earthquakeSecondary Control Area following an earthquakeλλ Secondary Control AreaSecondary Control Area

–– used only in case of inhabitability or hostile takeover of used only in case of inhabitability or hostile takeover of Main Control RoomMain Control Room

–– all Group 2 control functions are available in the SCA all Group 2 control functions are available in the SCA (shutdown, cool, monitor)(shutdown, cool, monitor)

–– seismically qualifiedseismically qualified


CANDU 9 Control CentreCANDU 9 Control Centre MockupMockup


Operability ImprovementsOperability Improvementsλλ separation of plant control and display/annunciation separation of plant control and display/annunciation λλ central overview displaycentral overview displayλλ improved displays to suit operational tasksimproved displays to suit operational tasksλλ improved display navigationimproved display navigationλλ advanced computerized annunciation systemadvanced computerized annunciation systemλλ common plantcommon plant--wide parameter databasewide parameter databaseλλ computerized safety system testingcomputerized safety system testing


Evolution of Plant Control and MonitoringEvolution of Plant Control and Monitoring

Plant Display SystemPlant Display System

Relay Logic and Analog Relay Logic and Analog ControllersControllers

Distributed Control Distributed Control SystemSystem

Digital Control Digital Control ComputersComputers

-- DisplayDisplay-- AnnunciationAnnunciation-- Control ProgramsControl Programs

-- DisplayDisplay-- AnnunciationAnnunciation

-- Control ProgramsControl Programs-- Relay logicRelay logic-- Most analog control functionsMost analog control functions


CANDU 6 C&I Systems OverviewCANDU 6 C&I Systems OverviewMAIN CONTROL ROOM

GROUP 1 PROCESSSYSTEMS INTERFACES

SAFETY SYSTEMSINTERFACES

ConsoleWork

Stations

PanelWork

Stations

HardwiredPanel

Devices

HardwiredPanel

Devices

SECONDARY CONTROL ROOM

HardwiredPanel

Devices

GROUP 2 INTERFACES

DCC

SDS2 Primary

SDS2 Backup

CONTROL SENSORS AND ACTUATORS (GROUP1)GROUP 1 SAFETY

SYSTEMS SENSORSAND ACTUATORS

GROUP 2 SYSTEMS SENSORSAND ACTUATORS

KEY

CONT CONTAINMENTISOLATION

ECC EMERGENCYCORE COOLING

ISO SIGNAL ISOLATIONOR BUFFERING

SDS SHUTDOWNSYSTEM

DATA LINK

SIGNAL WIRING

SDS1 Primary

SDS1 Backup

WOLSONG

DCC DIGITALCONTROLCOMPUTER


CANDU 9 C&I Systems OverviewCANDU 9 C&I Systems OverviewMAIN CONTROL ROOM

GROUP 1 PROCESSSYSTEMS INTERFACES

SAFETY SYSTEMSINTERFACES

ConsoleWork

Stations

PanelWork

Stations

HardwiredPanel

Devices

ConsoleWork

Stations

HardwiredPanel

Devices

SECONDARY CONTROL ROOM

PanelWorkStations

HardwiredPanel

Devices

GROUP 2 INTERFACES

ISO

ISO

ISO

GROUP 2SSM

ISO

ISO

PDS

ISO ISO ISO

SDS2 SSS

ECC

CONTROL SENSORS AND ACTUATORS (GROUP1)GROUP 1 SAFETY

SYSTEMS SENSORSAND ACTUATORS

GROUP 2 SYSTEMS SENSORSAND ACTUATORS

RRS HTS SG

AUX CP FH

KEY

AUX AUXILIARYSYSTEMSCONTROLLOGIC

CONT CONTAINMENTISOLATION

CP CONVENTIONALPLANTLOGICCONTROL

ECC EMERGENCYCORE COOLING

HTS HEAT TRANSPORTSYSTEMCONTOLLOGIC

FH FUEL HANDLING

ISO SIGNAL ISOLATIONOR BUFFERING

PDS PLANT DISPLAYSYSTEMS

RRS REACTORREGULATINGSYSTEMCONTROL LOGIC

SDS SHUTDOWNSYSTEM

SG STEAMGENERATORCONTROLLOGIC

SSS

SSM SAFETY SYSTEMMONITOR

SAFETY SUPPORT SYSTEMS

DISTRIBUTED CONTROL SYSTEM

DATA LINK

SIGNAL WIRING

ISO ISO

SDS1

CONT

GROUP 1SSM

CANDU 9


Plant Display System Plant Display System -- Improved NavigationImproved Navigationλλ two redundant forms of two redundant forms of

navigation are provided at all navigation are provided at all timestimes–– navigation icons within navigation icons within

process monitoring and process monitoring and control displays, andcontrol displays, and

–– direct display selection direct display selection via ‘soft function’ keypadsvia ‘soft function’ keypads


Plant Display System Plant Display System -- Improved NavigationImproved Navigation

Links to other displays

Links to control dialogs


λλ system supports overall operational strategy to managing system supports overall operational strategy to managing plant upsets and emergenciesplant upsets and emergencies

λλ CSP display providesCSP display provides–– functional representation of safety state of the plantfunctional representation of safety state of the plant–– high level physical map to key CSPhigh level physical map to key CSP--related systemsrelated systems

λλ CSP monitoring is part of the Safety System Monitor Computer CSP monitoring is part of the Safety System Monitor Computer DisplayDisplay

Critical Safety Parameter Monitor SystemCritical Safety Parameter Monitor System


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24/05/01 CANDU Safety - #24 -CANDU 9 Design Overview.ppt Rev. 0 vgs 19LCV201

PHP003

LCV202

LCV203

kg/sD20Flow

135.5

kg/sRHTR3.5

kg/sFlow

23.5

SG1

35.5 % 35.5 %

35.5 %

Enhanced Process Monitoring/Control DisplaysEnhanced Process Monitoring/Control Displays

15:10:00 15:12:00 15:14:00 15:16:00

10

5

0

SG 4 m6.0SDS1

SG 3 m6.5SG 2 m7.0SG 1 m1.0

Boiler Levels Boiler 1 Lvl Low

HT Pressure HighZone HDR Pres LoN Condenser 1 Low

RCW Temp HighDemin Flow Low

CSDVs ClosedPower & Generating

LZC P2 RunningN HT Purif Isolated

Alternate Mode

FaultsFaults StatusStatus


Advanced Computerized Annunciation SystemAdvanced Computerized Annunciation Systemλλ alarm processingalarm processing

–– prioritization and conditioning based on plant stateprioritization and conditioning based on plant state–– alarm coalescing, causealarm coalescing, cause--consequenceconsequence–– new types of alarms (expectednew types of alarms (expected--butbut--notnot--occurred, OP&P occurred, OP&P

violations, rate and margin violations, rate and margin -- advanced warning)advanced warning)λλ alarm presentation: central displaysalarm presentation: central displays

–– fault messages ordered and colour coded by priorityfault messages ordered and colour coded by priority–– status messages ordered by timestatus messages ordered by time


<<-- Fault DisplayFault Display

Status Display Status Display -->>


CANDU 9/CANDU 6 Electrical Overview DiagramsCANDU 9/CANDU 6 Electrical Overview DiagramsGridGrid Turbine/Turbine/

GeneratorGenerator

ClCl IVIVSuppliesSupplies

OnOn--sitesite EmergEmerg..Standby DGStandby DG

OnOn--sitesiteStandby DGStandby DG

ClCl IIIIIISuppliesSupplies


ClCl II AC PowerII AC PowerInstrumentationInstrumentation

ClCl I DCI DCBatteries & PowerBatteries & Power

ClCl II UPSII UPSAC PowerAC Power




Group 2Group 2Group 1Group 1

CANDU 9CANDU 9 GridGrid Turbine/Turbine/GeneratorGenerator

ClCl IVIVSuppliesSupplies

OnOn--sitesite EmergEmerg..Standby DGStandby DG

OnOn--sitesiteStandby DGStandby DG



ClCl I DCI DCPowerPower


ClCl IIIIAC PowerAC Power




Group 2Group 2Group 1Group 1

CANDU 6CANDU 6

ECC Pumps &ECC Pumps &Other LoadsOther Loads


SummarySummaryλλ evolutionary improvement approach ensures updated designs evolutionary improvement approach ensures updated designs

without economic risk of new conceptswithout economic risk of new conceptsλλ operating experience reports and database systems are used operating experience reports and database systems are used

to determine improvements to CANDU productsto determine improvements to CANDU productsλλ major improvements in control centre, and instrumentation major improvements in control centre, and instrumentation

and control systemsand control systemsλλ major improvements in safety (next lecture)major improvements in safety (next lecture)

CANDU Safety #24 - CANDU 9 Design Overview Library/19990125.pdf · 2011-09-15 · 24/05/01 CANDU...

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Transcript of CANDU Safety #24 - CANDU 9 Design Overview Library/19990125.pdf · 2011-09-15 · 24/05/01 CANDU...