Transcript Presentation Title Goes Here

Electrical, Control and Information
Systems
in the Enhanced CANDU 6®
By Sunil Tikku , presented by Jerry Hopwood
SIEN
Bucharest, October 2011
Candu – Official Use Only
Outline
•Introduction to the Enhanced CANDU 6
•I&C design philosophy and architecture
–Basic principles and architecture
–Drivers for design changes
•Specific I&C enhancements
–Electrical system enhancements
–Control room enhancements
–Control & Safety system enhancements
–Operational support systems (OSS)
•Generic engineering programs
•Summary
© Copyright 2011 , AECL
I&C Architecture
Secondary Control Area
HW Panel Devices
&
SMS Displays
Main Control Room
HW/Soft Panel Devices
&
SMS Displays
Single PDS
Workstation
(G2 & Limited G1)
Multiple PDS
Workstations
(G1 & G2)
SMS Gateways
PDS
Gateways
G2
G1
Production DCS
Mitigating
Systems
Safety Systems
G2
G2
G1
Multiple
Partitions
G1
Electrical Isolation Devices
Safety Equipment (Sensors/Actuators)
Process Equipment (Sensors/Actuators)
LEGEND
Signal Wiring
SSMC LAN
PDS LAN
© Copyright 2011 , AECL
Category A/B/C
Category C and Lower
Drivers for EC&I Enhancements
•compliance with new and more stringent licensing requirements
•improvements to enhance plant safety margins
•improvements to address customer feedback
•improvements for higher plant performance, reduced capital costs
and more economic life-cycle operation
•Compliance to international I&C standards
•changes to address obsolescence
•other opportunities for improvement
© Copyright 2011 , AECL
Electrical Power System Enhancements
•Each unit has dedicated pair of redundant standby generators with
auto start
•Seismically qualified uninterruptible power supplies (UPSs) added
with automatic start-up of essential loads
•Manual tie-in circuit breakers between the redundant buses of the
two units to enhance availability
© Copyright 2011 , AECL
EC6 MCR Enhancements
•Similar to C6 panel layout (some improvements)
•Preserves “operate at panel” philosophy
•Incorporates advantages of digital systems
•Avoids over-reliance on complex software
•Centralized operator console provides monitoring, test and
supervisory support functions
•Digital device controls (where appropriate)
•Computerized safety system testing
© Copyright 2011 , AECL
EC6 MCR Enhancements (2)
•Seismically qualified MCR
•Computerized and seismically qualified Safety Monitoring System
(includes PAM, h/w back-ups)
•Advanced alarm annunciation with h/w back-ups
•Computer based procedures (including safety system testing, EOPs)
© Copyright 2011 , AECL
Digital Safety Systems
•SDS 1 &2 remain independent and diverse:
–fully separate and diverse voting, actuation and shut-down mechanisms
–each employs triplicated computerized trip channels
–both on new digital platforms (diverse design)
–two out of three voting logic in each SDS
–adding digital neutronics trips
–adding two faster rate trips on each SDS
•Digital emergency core cooling system (ECC)
•Digital emergency heat removal system (EHRS)
•Containment systems remain as relay logic
© Copyright 2011 , AECL
Reactor Instrumentation Enhancements
•Adding more in-core flux detectors
•Additional SDS 2 in-core detectors in lower core (eliminates
difference compensation)
•Replacing ion chambers with fission chambers
–Eliminate lead shielding (reduced seismic load)
–Improved detector range
–Reduced reliance on start-up instrumentation
•Adding fission chambers on both sides of core for both shut-down
systems
Control System Enhancements
•Modern DCS technology to replace Digital Control Computers (DCCs)
–Design for safety, reliability, and maintenance
–Tighter integration of device and group control
–Separate mitigating controller (credited class 2)
–Increased use of local controllers
–Reduction in wiring and signal marshalling
–Separate Fuel-Handling DCS & display system
–Separate digital Fuel-Handling protective system
© Copyright 2011 , AECL
Display System Enhancements
•Safety qualified display systems (ACCIS® platform)
•Supervisory functions in Plant Display System (PDS)
•Use of local panel displays (touch panel VDUs and display-only VDUs)
•Advanced alarm annunciation (intelligent alarm conditioning and
management)
•Robust PDS system architecture
•Design for safety, maintainability and reliability
Operational Support Systems
•Plant information systems to help meet plant performance targets (94%
annual capacity factor, 1% forced loss rate)
•Increased equipment and system health monitoring
–Single points of vulnerability (SPV) and critical components
–Smart CANDU® applications
•Provision of online safety/reliability monitors
•Provision of an equipment status monitor (ESM)
•Provision of an historical data system (HDS)
•Improved data exchange and integration, plant configuration management
EC&I Enhancements for Severe Accidents
•Dedicated diesel generator / batteries and power distribution system to
handle severe accident recovery and heat removal
•Monitoring to deal with SA available in both MCR and SCA (in form of
hardwired and computerized safety parameter display)
•All related instrumentation evaluated / enhanced to cover the
measurement ranges expected for SA
•Instrumentation assessed for layout and power source considerations for
post SA effectiveness
•Instrumentation EQ’ed and assessed for survivability under SA conditions
© Copyright 2011 , AECL
Generic Engineering Programs
These are applied to the design of all or many plant systems and include:
–Increased use of simulation (“EC6Sim” Dynamic Simulator for design
assist, plant dynamics, Anticipated Operation Occurrence analysis etc.)
–Functional MCR mock-up facility
–IEC standards for I&C system life cycle design
–Human factors engineering program
–Operating experience feedback program
–Equipment qualification (EQ) program
–Integrated cyber security program
© Copyright 2011 , AECL
Summary
•EC6 builds on proven success of CANDU 6
•Design to meet or exceed current new build requirements
•EC&I enhancements provide improvements:
–in safety margin
–in plant performance
–to address OPEX and customer feedback issues
–in life-cycle cost reduction (improved maintainability, reliability,
reduced obsolescence issues)