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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 Loop

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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