Eddy-Current Inspection for Steam Generator Tubing Program: Quarterly Progress Report for Period Ending June 30, 1979

Technical Report · Mon Oct 01 00:00:00 EDT 1979

DOI:https://doi.org/10.2172/6022795· OSTI ID:6022795

Dodd, C. V. ^[1]; Deeds, W. E. ^[1]; McClung, R. W. ^[1]

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1. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

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. Experimental measurements have confirmed these results, though more testing is needed for all the different combinations of cases and different types of defects. Design and construction of instrumentation systems that will be used in the field is continuing.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE; USNRC
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 6022795
• Report Number(s): ORNL/NUREG/TM--353; NUREG/CR-1069
• Country of Publication: United States
• Language: English

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