Eddy-current inspection for steam-generator tubing program. Quarterly progress report for period ending June 30, 1978

Technical Report · Mon Oct 16 04:00:00 EDT 1978

DOI:https://doi.org/10.2172/6608403· OSTI ID:6608403

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 many independent variables affect the signals. The current development program will use mathematical models and develop or modify computer programs to design optimum probes, instrumentation, and techniques for multifrequency, multiproperty examinations. Interactive calculations and experimental measurements are 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 final eddy-current instruments will contain on-board microcomputers for real-time data processing and interpretation. Progress is being made in adding to the computer programs parameters for different circuit designs. Programs that allow direct interfacing between a minicomputer and the eddy-current instrument have been written and tested on preliminary tubing. The first modular three-frequency instrument has been constructed. We are continuing to acquire tubing standards and specimens for developing and checking the instrumentation and techniques.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 6608403
• Report Number(s): NUREG/CR-0479; ORNL/NUREG/TM-274
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
220200* -- Nuclear Reactor Technology-- Components & Accessories
BOILERS
DEFECTS
EDDY CURRENT TESTING
ELECTROMAGNETIC TESTING
IN-SERVICE INSPECTION
INSPECTION
MATERIALS TESTING
NONDESTRUCTIVE TESTING
POWER REACTORS
REACTORS
RESEARCH PROGRAMS
STEAM GENERATORS
TESTING
VAPOR GENERATORS