Abstract
The influence technological heredity connected with the manufacturing process on the strength and service life of the assembly of joints of the collector and heat exchange pipes of a steam generator proves to be one of the main causes of premature failures of steam generators of water-cooled reactors of nuclear power plants. We present the results of a numerical simulation of the process of press-fitting of heat-exchange pipes in the collector. We determine the residual stress-strain state of the collector assembly depending on the basic technological parameters of press-fitting (the initial gap between the pipe and the collector, the pressure of hydraulic press-fitting, and the boundaries of the region of application of pressure) and strength characteristics of the materials of the collector and pipes. We also estimate the influence of the additional mechanical flaring of pipes and redistribution of local stresses in the course of consecutive hydraulic press-fitting on the level of residual stresses in the collector assembly.
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