Transcript Document
A Dual Elevator Meteorological
System at the Cooper Nuclear
Station
Jim Holian/Russ Southerland
SAIC
June 2005 NUMUG Meeting
Existing Meteorological System (9/04)
• 1982 design
• Single sensors on 100-meter tower - WS,
WD, T, Delta-T (10-, 60-, and 100-meter)
• Single elevator system
• 10-meter backup tower
• Precipitation on shelter roof
• PDP 11/34 computer system (in Plant)
Problems
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Difficulty achieving 90% data recovery
I&C delay repairing system
Increased sensor/wiring failures
Single point of failure – PDP 11/23
No viable independent backup system
Lost data during power failures
System becoming labor intensive ($$$$)
Old Single Carriage
CNS Met Upgrade Requirements
•
A viable, independent backup system with
independent elevator system, allowing one
system to be taken out of service without
impacting the other.
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Averaging performed in the MET shelter
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Primary and secondary storage of digital data in
the MET shelter as well as on PMIS.
CNS Met Upgrade Requirements
•
Off-the-shelf commercial-grade equipment with
the averaging software included within the unit,
eliminating the need to develop and maintain
software and associated quality control on the
PMIS.
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Real-time meteorological data validation based on
meteorological principles, CNS site conditions,
and climatology
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Eliminate strip chart recorders
CNS Met Upgrade Requirements
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Automatic and immediate substitution of data
whether a single sensor fails, is impacted by
meteorological conditions, or the entire System A
or B is out of service.
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Real-time meteorological data validation based on
meteorological principles, CNS site conditions,
and climatology
•
UPS system in place to maintain power to the
MET instruments during short-term station
blackout
Meteorological Parameters
Systems A and B
10, 60, and 100 meter wind speed and
direction
3 Delta-ts (60m-10m, 100m-10m, 100m-60m)
10, 60, and 100 meter temperatures
System A only
10 meter dew point
Station Pressure
Precipitation
Meteorological Equipment
System A
Climatronics F460 Wind speed and Direction
Sensors
Climatronics Temperature Sensors
Tower Systems Elevator
Climatronics Dew Point Sensor
Climatronics Tipping Bucket Rain gauge with
Wind Shield
Campbell Scientific 23X Micro Dataloggers
Climatronics Pressure Sensor
Meteorological Equipment
System B
Met One 50.5 Sonic Wind speed and
Direction Sensors
Climatronics Temperature Sensors
Tower Systems Elevator
Campbell Scientific 23X Micro Dataloggers
Dual System Design Basis
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Two Elevator Systems on same face (biggest
design challenge)
• Validation without elimination
• Reduce false 9 out of data
• Include onsite conditions/climatology
Dual System Design Basis (cont’d)
•Produce a valid data set that is the “best of”
•Reduce manual labor
•Decrease maintenance costs (i.e. Sonic)
•Independently shut down individual sensors
Site-Specific Software
• Detects the presence of wind direction shear
between tower levels
• Identifies differences in the data attributable to
tower interference
• Recognizes light and variable winds
• Identifies wind speed cup/threshold problems
before they become obvious
Site-Specific Software (cont’d)
• Recognizes delta-t differences attributed to
sunrise/sunset/precipitation onset
• Identifies aspirator trips/fluctuations
• Identifies problems associated with
temperature/dew point/precipitation
interactions
• Ability to turn off any sensor remotely
Tower Interference
Validity Flags Summary
0-3
Good data, best of both Systems A and B
4-6
Requires closer review because system
validation was limited or non-existent
7-8
Requires intense scrutiny because data failed
system validation
9
Bad or missing data
Construction/Installation
Brownville, Nebraska
(Sept-Oct 04)
Wind, wind, and more wind!!!
Old Winch Box
Old Elevator Box
Old Rack
Dual Monitoring System
Met Shelter Onsite
CNS Dual System Summary
• Dual elevator installed on same tower face
• Totally independent dual meteorological
monitoring system
• System operational since 10/26/04
• No problems to date – system performing
as designed.
• Automatic data validation – (interesting
comparisons between standard/sonic sensors
– future NUMUG paper!)