Metallurgical evaluation of a failed LP turbine disc. Final report
Technical Report
·
OSTI ID:6547169
A metallurgical evaluation of a burst disc from the LP turbine at the Yankee Rowe nuclear generating station was performed. The turbine failure incident involves catastrophic rupture of both No. 1 discs during a start-up. The objectives of the evaluation were to characterize the disc materials and identify the cacking mechanism and other metallurgical factors involved in the failure. Metallographic and fractographic examinations of one segment of the No. generator-end disc were performed. The mechanical properties and composition of the disc segment were also determined. The investigation established that the radial fracture in the disc segment initiated at a service-induced crack and was of a generally brittle character. Also, numerous subcritical cracks were observed in the bore surface.
- Research Organization:
- Southwest Research Inst., San Antonio, TX (USA)
- OSTI ID:
- 6547169
- Report Number(s):
- EPRI-NP-2738; ON: DE83901100
- Country of Publication:
- United States
- Language:
- English
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ALLOYS
CHARPY TEST
CRYSTAL STRUCTURE
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ENRICHED URANIUM REACTORS
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MACHINERY
MATERIALS TESTING
MECHANICAL TESTS
MICROSTRUCTURE
POWER REACTORS
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ROWE YANKEE REACTOR
STEAM TURBINES
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WATER MODERATED REACTORS