Eddy-current inspection for steam generator tubing program: Annual progress report for period ending December 31, 1988
Reflection probes have demonstrated an improved capability to detect and size defects in degraded steam generators. We have been optimizing the reflection probes and the instrument operating parameters for steam generator inspections. We have developed programs that accurately calculate the changes in the eddy-current sheets, tube supports, copper deposits, magnetite deposits, denting, and defects. Other programs compute the accuracy and sensitivity of eddy-current measurements of defects in the presence of these property variations. These programs have been run to optimize reflection, pancake and circumferential coils. A comparison between the optimum of each type showed that the reflection coils are best, the pancake coils next and the circumferential coils are worst. We have designed both single reflection coil probes and an array of 16 reflection coils. We have also studied the accuracy of the defect theory for reflection, pancake and circumferential coils and experimentally verified the theory. The newest inversion technique shows good potential for a direct and accurate determination of defect size and depth. 8 figs.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6798205
- Report Number(s):
- CONF-8810155-34; ON: DE89005340
- Country of Publication:
- United States
- Language:
- English
Similar Records
Evaluation and field validation of Eddy-Current array probes for steam generator tube inspection
Evaluation of the eddy-current method for the inspection of steam generator tubing: denting. [PWR]
Related Subjects
210200* -- Power Reactors
Nonbreeding
Light-Water Moderated
Nonboiling Water Cooled
BOILERS
CHEMICAL REACTIONS
COMPARATIVE EVALUATIONS
CORROSION
CRACKS
DOCUMENT TYPES
EDDY CURRENT TESTING
ELECTRIC COILS
ELECTRIC PROBES
ELECTRICAL EQUIPMENT
ELECTROMAGNETIC TESTING
EQUIPMENT
FATIGUE
FRETTING CORROSION
INSPECTION
INTERGRANULAR CORROSION
MATERIALS TESTING
MECHANICAL PROPERTIES
NONDESTRUCTIVE TESTING
PITTING CORROSION
PROBES
PROGRESS REPORT
PWR TYPE REACTORS
REACTORS
STEAM GENERATORS
TESTING
TUBES
VAPOR GENERATORS
WATER COOLED REACTORS
WATER MODERATED REACTORS