Key technologies for internal components installation and cleaning control of CAP1000 steam generator
In view of the problems such as key installation processes and cleanliness control of internal components inside the CAP1000 steam generator,and the difficulties in precise position adjustment and temporary fixation of the internal components such as the primary separator and water supply ring in the limited space were analyzed.The problems of pollution and collision encountered in the coaxial installation of the inner sleeve in the lower shell and in the final butt welding of the U-shaped end of the heat exchange tube in the shell were studied.A plan of cleaning and installation technology was proposed based on the structural characteristics of the internal components.By designing and applying various mechanical adjustment and support devices to replace the conventional welding fixing method,various installation dimensions were more accurately controlled,and the internal pollution by welding and polishing was avoided.It is proven by practice that the plan and method proposed here can effectively improve the manufacturing accuracy,the cleanliness and the overall quality of the products of internal components of CAP1000 steam generator.
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