Abstract
The problem of evaluating structural integrity of primary water reactor steam generator tubes during normal operation, main steam line break, and severe accidents is addressed. Failure models for intact tubes as well as tubes with axial and circumferential machined flaws are discussed. Two types of tube failure are identified—ligament rupture and unstable burst. The models are generalized for application to complex stress corrosion cracks that are observed in the field. Results from rupture tests of flawed steam generator tubes are discussed and used to validate the failure models.
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