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Reliable operation of secondary equipment of PWR nuclear power plants is an integral part of nuclear and radiation safety of the entire NPP unit. The problem of stress strain state of steam turbine structural components under plastic deformation is considered. The theory of elastic-plastic deformations is used to solve the problem along with the finite element method. The paper presents the results of computer assessment of stress strain state of locking joint of working blades of the first stage of a intermediate-pressure cylinder (IPC) and high-pressure cylinder (HPC) body of a steam turbine, which makes it possible to characterize the degree of relaxation and stress redistribution in the structure in comparison with obtained earlier results. It is provided that the use of the presented calculation method in designing new structures of steam turbine components operating in the area of high thermal and power loads, taking into account the contact interaction of components, as well as different mechanical and physical properties of materials, and their changes depending on operating temperature, at this stage of software development allows one to identify problem areas in the design and prevent further breakdowns in the turbine. Based on the comparison of operational data of the developed design solutions and calculation assessment, it is proved that the chosen calculation method can significantly increase the operational reliability not only of the turbine unit but also the nuclear unit as a whole, as well as reduce economic costs caused by turbine unit downtime during maintenance.

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Представлены результаты разработки сварного комбинированного ротора среднего давления паровой турбины нового поколения К-325-23,5 производства АО «Турбоатом». При разработке использовались результаты опытно-конструкторских и научноисследовательских работ по выбору рациональных форм отдельных дисков и мест расположения кольцевых перемычек со сварными швами для обеспечения приемлемого уровня напряжений, что является одним из основных требований при проектировании сварных роторов. Ключевые слова: паровая турбина, сварной комбинированный ротор, насадной диск, вал, температура пара, эквивалентные напряжения, твердость сварного соединения.

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