Master curve reference temperature behavior of steels with varying Ni/Mn content and subjected to a fluence of 11·1019 neutron/cm2

Sebastian Lindqvist*, Murthy Kolluri, David Cinger, Maksym Zarazovskii, Szavai Szabolcs, Eberhard Altstadt

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The degradation of fracture toughness due to irradiation needs to be understood to assess the structural integrity of reactor pressure vessels for long-term operation. The level of degradation is dependent on the chemical content, particularly of elements like Ni and Mn. The fracture toughness properties for three types of steels (i.e. VVER-1000 steel, western model steel and VVER-1000 welds) with varying contents of Ni and Mn were characterized based on Master Curve T0 reference temperature in reference condition and in irradiated condition. The results show that, in the high fluence region, the shifts in T0 correlate with the content of Ni and Mn, and the scatter in fracture toughness is mostly consistent for the reference and irradiated conditions. At higher T0 values, above 75 °C, T41J gives an increasingly larger estimate compared to T0. The obtained results can be applied to develop new improved embrittlement trends curves for NPP lifetime assessment.
Original languageEnglish
Article number105421
JournalInternational Journal of Pressure Vessels and Piping
Volume214
DOIs
Publication statusPublished - Apr 2025
MoE publication typeA1 Journal article-refereed

Funding

STRUMAT-LTO is a Horizon 2020 project that is funded by the Euratom research and training program 2019-2020, under grant agreement n\u00B0945272. Thanks to Timo Veijola and Wade Karlsen for the review.

Keywords

  • High fluence
  • Ni and Mn
  • Fracture toughness
  • Master curve
  • Homogeneity

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