Fatigue Analysis of Integrated Reactor Feedwater Steam Outlet Nozzles

摘要

Thermal and fatigue analyses are performed to evaluate the structural integrity of thefeedwater & steam outlet nozzles in Integrated Reactor The feedwater & steam outlet nozzles and support skirt are analyzed considering the interaction effects and accurate calculation at the intersection among the three components. They are modeled using the three dimensional technique and the assembly is symmetric about the longitudinal section, only 1/12 of the entire nozzle is analyzed. Three dimension finite element model is modeled using the Pro-Engineer and ANSYS ICEM CFD and then analyzed by ANSYS code. The stresses are calculated from the design pressure and external loads. The temperature distributions for each transient condition are calculated from the heat transfer calculation. The postprocessor POST1 of the ANSYS program is used to combine the stresses. Also it is used to linearize and evaluate the stresses for all loading conditions. Doosan program "AFPOST" is also used for range of stress intensity and fatigue evaluation. Results of the finite element analysis are temperature distribution, thermal stress, pressure stress distribution and maximum fatigue usage factor. The result is shown that the integrity of feedwater & steam outlet nozzles meets all the static strength criteria of ASME and KEPIC Code.