35th EPRI NDE Conference Automatic History Comparison · PDF fileWestinghouse Non-Proprietary...

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Qui Le, Fellow Engineer Westinghouse Electric Company LLCStephen Beehner, NDE Level III Westinghouse Electric Company LLC

Utility Sponsor:Douglas Hansen, APS

35th EPRI NDE Conference

Automatic History Comparison (AHC) Experience at Palo Verde

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Automated History Comparison (AHC) Outline• AHC Detection Evaluation• AHC Process Implementation• AHC Results• Lessons Learned• Conclusion

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Automated History Comparison (AHC) Detection Evaluation• Westinghouse Data Union Software (DUS) was used to

create qualification data• Injection location: Top of Tubesheet (TTS)

– centered at TTS + 0.08 inch – centered at TTS + 0.3 inch

• Injection data is Unit 2, year 2011• Historical data is required for AHC• Donors taken from ETSS 27901

– Circumferential Groove– Axial Groove– Round Tapered Hole

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AHC Detection Evaluation – 60% Tapered Round Hole at 0.08”

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AHC Detection Evaluation – 70% Tapered Round Hole at 0.08”

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AHC Detection Evaluation – 30% Circ. Groove at 0.08”

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AHC Detection Evaluation – 60% Circ. Groove at 0.08”

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AHC Detection Evaluation – 20% Axial Groove at 0.3”

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AHC Detection Evaluation – 60% Axial Groove at 0.3”

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AHC Detection Evaluation – NDD – Mix Residual

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AHC Process Implementation• AHC Preparation

– Data from last inspection (2013) is selected for AHC process– Perform historical setup – Perform data indexing– Preparation would take 16 hours for 2 SGs

(total of 24,000 tubes)• Auto setup with over 20 AHC channels• Enhanced Auto Data Screening (EADS) is used for AHC• Auto Analysis setup with detection on AHC Channel 3 • AHC Channel 1 and AHC Channel 5 are used for

confirmation• AHC run time is about 1 second per tube

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AHC Process Implementation• AHC results are affected by:

– Changes of essential EC parameters – test frequency, gain– Probe variation (resonant frequency)– Data from 2 half-lengths in history are compared with current full-

length data collected by Zephyr®1 acquisition system• AHC process compensation and validation• AHC process error handling• AHC optimization (cache memory)• Selective data spooler to spool periphery tubes• Separate AHC PC is being used for periphery analysis1 Zephyr® is a trademark or registered trademark of Westinghouse Electric Company LLC, its affiliates and/or its subsidiaries in the United States of America and may be registered in other countries throughout the world. All rights reserved. Unauthorized use is strictly prohibited. Other names may be trademarks of their respective owners.

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AHC Field Implementation Results• Approximately 4000 periphery tubes were analyzed

with AHC • 300 I codes (DTI) were called by AHC, analyst kept 4• Lead analyst kept 3 DTI for supplemental array exam where

they are confirmed as historical anomaly

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AHC Field Implementation Results – DTI by Resolution Analysis – AHC NDD – Array: NDF

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AHC Field Implementation Results – AHC: NQI and Array: NDF

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Lessons Learned

• Enhance AHC error handling to improve user experience– Clear error message– Separate warning and real error

• Auto populate and enhance lissajous display for AHC channels

• Ease of recall and importing AHC report to resolution

• Improve validation for AHC database preparation process

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Conclusions• AHC alignment performs well most of the time when joining

2 historical tube halves against current full length tube• AHC optimization works well and is able to keep up with

high speed Zephyr® acquisition (120 ips)• Correlation between AHC channels minimizes overcall

Overcall is setup to be conservative for first field implementation

• AHC provides for added defense in depth above traditional analyses on detection of loose part wear

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Questions

35th EPRI NDE Conference Automatic History Comparison · PDF fileWestinghouse Non-Proprietary...

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