Repeatability of TREES rotor bore inspection system
The repeatability of near-bore flaw detection and sizing of the Turbine Rotor Examination and Evaluation System (TREES) developed in EPRI RP502 was examined by making many repeat scans of sample blocks containing fatigue cracks and embedded spherical- and disk-shaped flaws of various sizes. Comparison data was also collected manually using the Bore Ultrasonic Characterization System (BUCS). Approximately 1500 measurements were taken with TREES and 1200 were taken with BUCS during the course of this study. The results of this work showed that TREES consistently detected flaws in the near-bore region. TREES determined the radial extent of flaws with associated standard deviations of 18% for fatigue cracks, 30% for embedded spherical beads and 18 to 28% for embedded disk-shaped reflectors. Corresponding BUCS measurements showed larger measurement spreads in each flaw classification.
- Research Organization:
- Jones (J.A.) Applied Research Co., Charlotte, NC (USA)
- OSTI ID:
- 6663550
- Report Number(s):
- EPRI-NP-2640; ON: DE83900739
- Country of Publication:
- United States
- Language:
- English
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