Mercury modeling for PWSCC length sizing. [Primary water stress corrosion cracking]
- Westinghouse Electric Corp., Pittsburgh, PA (United States). Science and Technology Center
- Iowa State Univ. of Science and Technology, Ames, IA (United States)
This report describes the results of EPRI Program S404-28, titled Experimental Modeling of Eddy Current Response'', conducted by the Westinghouse Science and Technology Center (STC). The Westinghouse STC demonstrates that its mercury modeling technique provides an unique bridge between steam generator eddy current field inspection conditions and predictions obtained using recently developed analytical models. The mercury modeling technique was used systematically to explore factors which contribute to primary water stress corrosion cracking (PWSCC) sizing inaccuracy, including probe design, coil excitation frequency, crack length, and crack morphology. Two new proposed techniques for inverting crack lengths from eddy current data are compared with the technique commonly used in field data analysis for PWSCC. The performance of uniform field eddy current probes is compared with the performance of pancake coil probe designs, and an assessment of the advantages and limitations for each probe design is given. The effects of crack morphology (shape and crack-face connectivity) are shown to have a significant effect on crack length measurements, and methods for minimizing these errors are provided. Close agreement is shown with predictions obtained from analytical modeling performed at Iowa State University -- Center for NDE, providing a theoretical basis for the experimental mercury modeling results.
- Research Organization:
- Electric Power Research Inst., Palo Alto, CA (United States); Westinghouse Electric Corp., Pittsburgh, PA (United States). Science and Technology Center; Iowa State Univ. of Science and Technology, Ames, IA (United States)
- Sponsoring Organization:
- EPRI; Electric Power Research Inst., Palo Alto, CA (United States)
- OSTI ID:
- 7147353
- Report Number(s):
- EPRI-TR-101104
- Country of Publication:
- United States
- Language:
- English
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