Theoretical and experimental study on shrink fitting of reactor coolant pump rotor can

Rotor can is one of the key components in AP1000 reactor coolant pump. Shrink fitting is the most important procedure during the manufacturing process and the assembling process of reactor coolant pump rotor can. Firstly, the theoretical analysis was preformed to point out major factors affecting the shrink fitting process of rotor can and analyze the unsuccessful reason of the original shrink fitting of the rotor can. Then, the disadvantages of the original shrink fitting technology were pointed out and corresponding improved measures were taken. In addition, the shrink fitting experiments were carried out. The experimental results indicate that the improved shrink fitting technology can expand the shrink fitting time, which reduces the shrink fitting difficulty and improves the success ratio of the shrink fitting of the rotor can. (authors)