Qualification of Steam Generator Alloy I-690TT U-Bend Tubes in ACP1000 Nuclear Power Plants

In order to validate the whole manufacturing process and key technical parameters of nuclear steam generator heat transfer tubes and stabilize the properties during the tube mass production, an integrated technical qualification plan is established. This plan can evaluate the homogeneity of the chemical, mechanical and metallurgical properties, and can verify the effectiveness of non-destructive inspection methods of I-690 TT U-bend tubes. The plan has been implemented successfully in the domestic manufacture of ACP1000 steam generator tubes.