Improved eddy-current inspection for steam generator tubing

Conference · Sun Jan 01 04:00:00 EST 1989

OSTI ID:5273645

Dodd, C V; Pate, J R; Allen, Jr, J D ^[1]

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1. Oak Ridge National Lab., TN (USA)

Computer programs have been written to allow the analysis of different types of eddy-current probes and their performance under different steam generator test conditions. The probe types include the differential bobbin probe, the absolute bobbin probe, the pancake probe and the reflection probe. The generator test conditions include tube supports, copper deposits, magnetite deposits, denting, wastage, pitting, cracking and IGA. These studies are based mostly on computed values, with the limited number of test specimens available used to verify the computed results. The instrument readings were computed for a complete matrix of the different test conditions, and then the test conditions determined as a function of the readings by a least-squares technique. A comparison was made of the errors in fit and instrument drift for the different probe types. The computations of the change in instrument reading due to the defects have led to an inversion'' technique in which the defect properties can be computed from the instrument readings. This has been done both experimentally and analytically for each of these probe types. 3 refs., 13 figs., 1 tab.

• Research Organization: Oak Ridge National Lab., TN (USA)
• Sponsoring Organization: NRC
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5273645
• Report Number(s): CONF-8910222-7; ON: DE90003705; CNN: DOE-1886-8041-7B
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
220200* -- Nuclear Reactor Technology-- Components & Accessories
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
ANALOG SYSTEMS
ARTIFICIAL INTELLIGENCE
BOILERS
COMPARATIVE EVALUATIONS
COMPUTER CODES
CURRENTS
DESIGN
EDDY CURRENTS
ELECTRIC CURRENTS
ERRORS
FREQUENCY RESPONSE TESTING
FUNCTIONAL MODELS
L CODES
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
MEASURING METHODS
PERFORMANCE TESTING
REACTOR INSTRUMENTATION
REACTOR SIMULATORS
RESEARCH PROGRAMS
SAMPLING
SIMULATORS
STEAM GENERATORS
TESTING
VAPOR GENERATORS