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 • • • • • • • 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. • Averaging performed in the MET shelter • 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. • Real-time meteorological data validation based on meteorological principles, CNS site conditions, and climatology • Eliminate strip chart recorders CNS Met Upgrade Requirements • 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. • 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 • 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!)