Northeast Inspection Services, Inc. boresonic inspection system evaluation. Final report
- EPRI Nondestructive Evaluation Center, Charlotte, NC (United States)
Turbine rotor reliability and remaining life assessment are continuing concerns to electric utilities. Over the years, boresonic inspection and evaluation have served as primary components in rotor remaining life assessment. Beginning with an evaluation of TREES by EPRI in 1982, a series of reports that document the detection and sizing capabilities of several boresonic systems have been made available. These studies should provide utilities with a better understanding of system performance and lead to improved reliability when predicting rotor remaining life. In 1990, the procedures followed for evaluating rotor boresonic performance capabilities were changed to transfer a greater portion of the data analysis function to the participating vendor. This change from previous policy was instituted so that the evaluation results would better reflect the ``final answer`` that a vendor would provide in a real rotor inspection and also to reduce the cost of an evaluation. Among the first vendors to participate in the new performance demonstration was Northeast Inspection Services, Inc. (NISI). The tests reported herein were conducted by NISI personnel under the guidelines of the new plan. Details of the new evaluation plan are also presented. Rotor bore blocks containing surface-connected fatigue cracks, embedded glass beads, and embedded radial-axial oriented disks were used in the evaluation. Data were collected during twenty-five independent passes through the blocks. The evaluation consisted of statistical characterization of the detection capabilities, flaw sizing and location accuracy, and repeatability of the inspection system. The results of the evaluation are included in this report.
- Research Organization:
- Electric Power Research Inst., Palo Alto, CA (United States); EPRI Nondestructive Evaluation Center, Charlotte, NC (United States)
- Sponsoring Organization:
- Electric Power Research Inst., Palo Alto, CA (United States)
- OSTI ID:
- 10160466
- Report Number(s):
- EPRI-TR-102256; ON: UN93013919
- Resource Relation:
- Other Information: PBD: Apr 1993
- Country of Publication:
- United States
- Language:
- English
Similar Records
Reliability of the Southwest Research Institute TREES (Turbine Rotor Examination and Evaluation System) rotor bore inspection system
Liquid Salt Combined-Cycle Pilot Plant Design