Eddy--current inspection for steam generator tubing program annual progress report for period ending December 31, 1978

Technical Report · Tue May 01 00:00:00 EDT 1979

DOI:https://doi.org/10.2172/6208969· OSTI ID:6208969

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

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 will use existing 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 complicated 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 has been made in establishing the necessary computer codes, constructing some of the basic modules for the instrumentation, and acquiring selected tubing reference standards. To date, results show that eddy-current inspection does work and can make far better measurements than are possible with existing commercial instruments.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 6208969
• Report Number(s): NUREG/CR-0764; ORNL/NUREG/TM-311
• Country of Publication: United States
• Language: English

Related Subjects

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