Eddy-current inspection for steam generator tubing program quarterly progress report for period ending March 31, 1979

Technical Report · Wed Aug 01 04:00:00 EDT 1979

OSTI ID:6112828

Dodd, C V; Deeds, W E; McClung, R W

Eddy-current methods provide the best in-service inspection of steam generator tubing, but present techniques can produce ambiguity because of the many independent variables that affect the signals. The current development program has used mathematical models and developed or modified computer programs to design optimum probes, instrumentation, and techniques for multifrequency, multiproperty examinations. Interactive calculations and experimental measurements have been made with the use of modular eddy-current instrumentation and a minicomputer. These establish the coefficients for the complex equations that define the values of the desired properties (and the attainable accuracy) despite changes in other significant variables. The computer programs for calculating the accuracy with which various properties can be measured indicate that the tubing wall thickness and the defect size can be measured much more accurately than is currently required, even when other properties are varying. Our experimental measurements have confirmed these results, though more testing is needed for all the different combinations of cases and different types of defects. We are continuing to design and construct instrumentation systems that will be used in the field.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 6112828
• Report Number(s): NUREG/CR-0918; ORNL/NUREG/TM-341
• Country of Publication: United States
• Language: English

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