During the ASTM Symposium on Trend Curves in Prague (19-22 April 2022), two talks were given on STRUMAT-LTO results.
Murthy Kolluri (Scientific Coordinator of STRUMAT-LTO, NRG) presented the ‘STRUMAT-LTO overview and results’ in the special section for EU projects.
Maksim Zarazovskii (IPP) and Volodymyr Revka (KINR) have presented their article. The paper title is: ‘Chemical Composition Effect on Radiation Embrittlement and Hardening of WWER-1000 RPV Steels’. From the abstract:
Paper briefly describes the material characterization of the WWER-1000 RPVs which are operates in Ukraine and the RPV material degradation monitoring program using surveillance specimens. The research is aimed on the surveillance database collection for the following characteristics of the WWER-1000 PRV beltline welds –Transition Temperature, Yield Stress and Master-Curve Reference Temperature followed by statistical treatment and analysis of the databases. At that, Yield Stress and Master-Curve Reference Temperature databases are published for the first time. The main goal of the paper directed to the identification of the chemical factor influence on the radiation embrittlement and radiation hardening for welds of RPV core region. It is found that Silicon and Nickel have the greatest impact on the Transition Temperature shift. For the Yield Stress shift and Master-Curve Reference Temperature shift the most affected elements are Nickel, Silicon and Chromium. Also, it is shown that Nickel and Manganese have synergetic effect for the radiation embrittlement and hardening. Based on the results of the statistical analysis a simple general form for the embrittlement trend equations for Transition Temperature and Master-Curve Reference Temperature as well as embrittlement hardening curve are proposed.