Abstract
The operation of PWR-type EDF plants has shown that components have been subjected to loadings higher than the design basis loads. For example, localized degradations on nuclear system pipes were found after relatively short times (10-10 4 hours). The main damage mechanisms involved are: • - erosion—cavitation arising from the type of hydraulic flow, • - vibrational fatigue arising from the flow or operation of mechanical • - corrosion fatigue occurring in some confined spaces (dead ends). This paper addresses these damage modes and the mitigating steps taken to cope with them, together with the initiatives taken for future reactors.
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