Effect of Thermal Ageing on Mechanical and Fracture Properties Steels of Nuclear Power Plant: a Review

Authors

DOI:

https://doi.org/10.20535/2521-1943.2026.10.1.354867

Keywords:

nuclear reactor, long term operation, nuclear materials, thermal aging, embrittlement, degradation, microstructure evolution, mechanical properties, fracture toughness

Abstract

Most of Ukraine’s nuclear power plant units have reached the end of their design life (30 years), which, in the context of the transition to long-term operation, increases the risk of accidents due to the degradation of structural materials. The introduction of the ageing management concept in the nuclear industry and the tightening of regulatory requirements necessitate a comprehensive study of ageing mechanisms, in particular a quantitative assessment of their impact on the strength and fracture resistance characteristics of equipment beyond its design life. The aim of this work is to analyse scientific research on the impact of long-term thermal ageing on the mechanical properties and fracture parameters of reactor plant materials. The review examines global experience in ageing management, analyses temperature-time operating conditions, and provides a detailed description of the evolution of the microstructure and mechanical properties of the main types of reactor steels: low-alloy, austenitic, austenitic-ferritic, martensitic and martensitic-ferritic. Understanding thermal degradation processes is crucial for the informed selection of materials, the prediction of their remaining service life, and the assurance of long-term safe operation of nuclear power plants. The search and selection of sources was carried out in the scientometric databases Scopus, Web of Science and Google Scholar for the period 2010–2025. This made it possible to summarise current experimental data and approaches to predicting the residual life and ensuring the operational reliability of nuclear power plants.

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Published

2026-04-29

How to Cite

[1]
K. Lukianenko, S. Shukayev, and M. Zarazovskii, “Effect of Thermal Ageing on Mechanical and Fracture Properties Steels of Nuclear Power Plant: a Review”, Mech. Adv. Technol., vol. 10, no. 1, Apr. 2026.

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Vol. 10 No. 1 (2026): in progress

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Mechanics

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Copyright (c) 2026 Костянтин Лук’яненко, Сергій Шукаєв, Максим Заразовський

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