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PerformanceTHROUGH LEADERSHIP
Flow Measurement Uncertainty
Due ToTransducer (Re)placement
InCaldon® LEFM Check and CheckPlus Systems
NON-PROPRIETARY
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Background
* During a review of the accuracy of LEFM Check and CheckPlus systems, NRC staffraised a question about the error associated with replacing transducers.
NRC requested empirical confirmation of the uncertainty
- Via demonstration at ARL during Seabrook LEFM CheckPlus calibration, and- Via statistically significant tests and analysis
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Results from Seabrook Calibration
Test Performed at Alden Research Laboratory.
- One transducer replaced and the observed difference in Meter Factor was 0.00%(Tests 193G and 193H)
- Test performed at high flows (15,000 to 20,000 gpm)- Not a statistically significant test
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NRC SER Dated July 5, 2006
Requested Cameron to perform statistically significant tests to determine theuncertainty for transducer replacement
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Transducer Change Out Tests Performed on the CameronFlow Loop
* The test was performed at the Cameron flow loop (nominal maximum flow of 5700gpm)
- One 150 HP Variable Speed Pump
- Flow loop is designed for the full flow range of an 8 inch meter
- Only -20% of the 18 inch LEFMI/+ flow meter's range
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Cameron Flow Calibration Laboratory
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Meter Under Test - LEFM CheckPlus at Cameron
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LEFM CheckPlus Meter - Assembled at Alden
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Procedure
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Fix Transducer Replacement Test Procedure
Install/replace all transducers at zero-flow conditions (16 transducers replaced foreach test)
Set flow rate
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Test Results Summary
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Test Results Summary
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Path Angle Sensitivity
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Calculation of Path Angle Sensitivity
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I MEASUREMENT SYSTEMS ITransducer Clearance Uncertainties a Function of PipeSize and Number of Pipes
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Conclusions
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Review of Existing Fleet
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