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Application of Modern Approaches to the Numerical Modeling of the Stress-Strain State for the Strength Assessment of Complex Units of the NPP Primary Circuit Equipment. Part 1. Submodeling Methodology

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Recently, much attention has been given to developing numerical modeling methods for calculations of complex nodes of structural elements, especially for the equipment of the first circuit of NPP. The use of new methods increases the accuracy of the results and significantly reduces the calculation time. This is especially important when solving the problems of modeling the processes of crack nucleation and propagation in the material, in which, in particular, local thickening of the finite element mesh is necessary. In this paper, a description of the “submodeling” technique is given, which allows one to calculate individual components of structural elements, taking into account complex geometric shapes, contact conditions, and other factors that are difficult to take into account in calculations by conventional methods. The submodeling technique was used to calculate the stressstrain state in complex components of the pressure compensator of the WWER-440 reactor unit. For this purpose, a global simplified finite element model of the pressure compensator and a detailed submodel of the injection nozzle were built, taking into account the gap between the containment and the inner surface of the nozzle, as well as contact conditions. The results showed that the submodeling technique gives more conservative results when modeling complex assemblies. Hence, its application increases the reliability of the results obtained when assessing the strength of critical structural elements, particularly the equipment of the first circuit of NPP.

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  1. Pisarenko Institute of Problems of Strength, National Academy of Sciences of Ukraine, Kyiv, Ukraine

    E. O. Kondryakov

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  1. E. O. Kondryakov
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Correspondence to E. O. Kondryakov.

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Translated from Problemy Mitsnosti, No. 6, pp. 102 – 108, November – December 2022

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Kondryakov, E.O. Application of Modern Approaches to the Numerical Modeling of the Stress-Strain State for the Strength Assessment of Complex Units of the NPP Primary Circuit Equipment. Part 1. Submodeling Methodology. Strength Mater 54, 1057–1063 (2022). https://doi.org/10.1007/s11223-023-00481-z

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