For a better understanding of thermal fatigue in piping mixing zone, EDF, CEA and AREVA ANP have developed a mock-up named FATHER. Tests performed on the mock-up have given access to fluid temperature thermal fluctuations and external surface strains. Tests were completed by an endurance test. Examinations revealed the presence of numerous cracks at different locations. EDF R&D has performed a numerical interpretation of the test, in relation with different specimen fatigue tests (HCF tests on polished specimens, influence of surface roughness, influence of mean stress,…) and with the use of different fatigue criteria (RCC-M, Fatemi-Socie, Dang Van…). Numerical results are compared with the results of examinations. A comparison is done with results obtained by codified methodologies for nuclear plants.

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