High Speed Digital Data Logging for OnLine Monitoring and Diagnostics in CANDU Nuclear Power Plants

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High Speed Digital Data Logging for On-Line
Monitoring and Diagnostics in CANDU Nuclear Power
Plants

• B. Sur, H. Storey, V.N.P. Anghel, H.W. Hinds
  (retired),
• Information Control Systems Development
  Division,
• D. Taylor, E. Young (retired),
• Point Lepreau Generating Station,
• O. Glockler,
• International Atomic Energy Agency

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Outline

• CANDU Safety Instrumentation
• High Speed (gt 10 Hz) digital data acquisition
  systems
• Examples of High Speed Data and Analysis from
  Point Lepreaus HSDL
• Lessons learned and issues for future permanently
  installed high-speed data acquisition systems

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CANDU Core Instrumentation
Shut-off Mechanical Control Absorber Rods
SDS 1 (vertical) ICFDs
Liquid Zone Controllers
SDS 2 (horizontal)ICFDs
(Adjuster Rods)
Ion Chambers
Poison Injection Nozzles
Spatial Control Vanadium ICFDs
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CANDU 6 Safety System Trips Instruments
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CANDU 6 Safety System Trips Instruments cont.
Time constants from few ms to 10s of hours
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Data Acquisition Systems - Standalone
Trip Comparator Buffer Amp
Dynamic Compensator
Up to 1 kHz
ADCs
Local Disc
ICFD
Adjustable Filter
Optical Iso- Amp
ICFD Amp
Installed as required
AECL / OPG s Noise Analysis System (NAS)
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Data Acquisition Systems - Permanent
Plant Upset Trigger
20 ms data
ADCs
Plant Data LAN
FIFO Buffer
Trip Comparator Buffer Amp
ICFD Amp
ICFD
Dynamic Compensator
Normal
HSDL Iso- Amp
6 s data
Point Lepreaus High Speed Data Logging System
(HSDL)
Permanently Installed
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Point Lepreaus permanently installed High Speed
Data Logger
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HSDL Reactor Trip Data
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HSDL Reactor Trip Data
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HSDL Reactor Trip Data
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HSDL Steady State Data for Detector 1D
Raw time sequence
Histogram
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HSDL Steady State Data for Detector 1D
Power Spectrum
Gain, Phase, Coherence
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Lessons learned Issues

• Data quality
• Dropped points and irrational data
• Examine, filter, correct data before analysis
• Data buffer and network limitations for long-term
  (hours) of steady state data
• Anti-aliasing input filter is required for noise
  analysis
• Ability to subtract dc would improve resolution
  for steady state data
• Analysis software a must
• But generally works as anticipated

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Usefulness of Permanent HSDL

• Any reactor trip becomes opportunity for safety
  system instrument verification
• Readily available data for plant upset diagnosis
• Steady State data available any time (eliminates
  temporary procedures)

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Conclusions Permanent High Speed Data Logger

• Necessary
• For demonstrating compliance with safety analysis
  time constants
• For effective sensor and system health monitoring
• For diagnosis and resolution of problems
• successfully implemented in Point Lepreau
• should be retrofitted on existing plants
• should be included in IC design of new plants

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