2nd Edition of World Nanotechnology Conference

April 27-29, 2020 | Baltimore, USA

Crowne Plaza Hotel Baltimore Dowtown –
Inner Harbor, 105 W Fayette Street
Baltimore, MD 21201 USA
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Email: worldnano@magnus-group.org
April 27-29, 2020 | Baltimore, USA

Evgenii Krasikov

Speaker for Nanotechnology Conferences  2020
Evgenii Krasikov
Kurchatov Institute, Russia
Title : Interaction of hydrogen with nanoscale structures in irradiated steel as radiation defects and grain-boundary segregants

Abstract:

It is known that in traditional power engineering hydrogen may be one of the firstprimary source of equipment damage. This problem has high actuality for both nuclear and thermonuclear power engineering owing to interaction of hydrogen with such nascent under neutron and ion irradiation nanoscale structures as radiation defects and grain-boundary segregants. The effects of neutron fluence and irradiation temperature on steel/hydrogen interactions (adsorption, desorption, diffusion, mechanical properties at different loading velocities, post-irradiation annealing) were studied. Experiments clearly reveal that the higher the neutron fluence and the lower the irradiation temperature, the more hydrogen-radiation defects occur, with corresponding effects on the RPV steel mechanical properties. It was determined at several experiments in I.V. Kurchatov Institute that for steel specimens irradiated at relatively low (100-140°C) temperatures in sealed ampoules filled with argon hydrogen content was many times higher relatively initial content. Analysis of the combined radiation-hydrogenation embrittlement of the vessel steel was performed, where at the mention of the American and own data question concerning unknown source of hydrogen in metal that was irradiated in nuclear reactor in hermetic ampoules was raised. Ageing of the irradiated steel during 48 hours revealed that IPH is not diffusible up to irradiation temperature attaining that is IRH are in the irradiation produced traps. It is necessary to look for enigmatic source of hydrogen especially because in frame of inspections numerous flows were detected in the forged rings of the reactor pressure vessels in the Belgian nuclear power plants Doel 3 and Tihange 2. As a possible initial hypothesis about the enigmatical source of hydrogen one can propose protons generation during beta-decay of free neutrons inasmuch as protons detected by researches at nuclear reactors as witness of beta-decay of free neutrons. Interaction hydrogen – grain-boundary segregants have to be taking into account as potential cause of the intergranular hydrogen embrittlement in reactor pressure vessel materials

Biography:

Education: Moscow Power Engineering Institute. Degree(s) or Diploma(s) obtained: Master’s Degree in Material Science – 1970, Ph.D. – 1974, D.Sc. -2005. Membership of professional bodies: member of Scientific Council of RAS on Radiation Damage Physics of Solids. Years within the firm: since 1974. Key qualification: responsible executor in Radiation Damage Physics of Solids. Professional experience record: since 1974 till now, Moscow, National Research Centre "Kurchatov Institute”, Department: Reactor Materials and Technologies Institute

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