Speaker
Mr
Baozhong Wang
(China First Heavy Industries)
Description
The mono-bloc nozzle shell for CAP1400 RPV is a combined component of Vessel flange，Nozzle shell course, inlet and outlet nozzles, safety injection nozzles. The mono-bloc nozzle shell manufacturing is technically challenging for hot working technique due to its complex shape and large size. In order to realize the dream of eliminating both U-shaped and circular welding seams, a series of research work by numerical simulation has been carried out. A final development has been adopted by using melting technique with low Si and controlled Al to cast a 700 ton super clean ingot, forging the nozzle shell by profile-modeling forging technique, that is pressing the nozzle plum blossom-protrusion like and then extruding to form the nozzle, and uniform cooling the large and complex shaped forging by swim-immersion into the water . A proportional experiment has been performed to verify the development. At last, the mono-bloc nozzle shell for CAP1400 RPV was successfully developed on the basis of optimization of the development.
Key words: mono-bloc nozzle shell, plum blossom-protrusion, swim-immersion
Author
Mr
Baozhong Wang
(China First Heavy Industries)