The eddy-current technique for nondestructive evaluation of generator retaining rings: Feasibility study: Interim report

Technical Report · Sun May 01 04:00:00 EDT 1988

OSTI ID:5162619

Elmo, P M; Nottingham, L D

An evaluation of the feasibility of using eddy current nondestructive inspection techniques to detect intergranular stress corrosion in generator rotor retaining rings was conducted by the EPRI NDE Center. Experiments were conducted using a bend-bar containing representative stress corrosion damage, a calibration block containing electrical discharge machined (EDM) notches, and four retired retaining rings containing EDM notches and stress corrosion damage. An eddy current transducer transport was designed and fabricated to interface with an existing computer-controlled, two-axis positioner and digital eddy current data acquisition system. Test results of experiments performed with this equipment on the retaining ring test-bed provided experimental validation of the eddy current method's feasibility as a retaining ring inspection method. Details are given of the system and its performance under laboratory and simulated service-inspection conditions. 9 refs., 47 figs.

• Research Organization: Jones (J.A.) Applied Research Co., Charlotte, NC (USA)
• OSTI ID: 5162619
• Report Number(s): EPRI-EL-5814; ON: TI88010353
• Country of Publication: United States
• Language: English

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BOILERS
CHEMICAL REACTIONS
COMPUTER GRAPHICS
CORROSION
CRACKING
CURRENTS
DAMAGE
DATA ACQUISITION SYSTEMS
DECOMPOSITION
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ELECTRIC CURRENTS
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STRESS ANALYSIS
TESTING
THERMOCHEMICAL PROCESSES
THREE-DIMENSIONAL CALCULATIONS
VAPOR GENERATORS