Authors & Affiliations
Osipov A.A., Ivanov K.D., Niyazov S.-A.S.
A.I. Leypunsky Institute for Physics and Power Engineering, Obninsk, Russia
Osipov A.A. – Senior Researcher, Cand. Sci. (Tech.). Contacts: 1, pl. Bondarenko, Obninsk, Kaluga region, Russia, 249033. Tel.: +7 (484) 399-46-56; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..
Ivanov K.D. – Leading Researcher, Dr. Sci. (Tech.).
Niyazov S.-A.S. – Senior Researcher.
Abstract
With regard to the mass transfer processes associated with the interaction of the coolant with structural steels and with
the behavior of solid-phase impurities based on iron oxides in the circulation
circuit with HLMC, the question of the influence of changes in the
physic-chemical state of the coolant due to the presence of iron impurities in
it is considered. When operating nuclear power plants with heavy heat carriers,
their physic-chemical state relative to the content of iron and oxygen
impurities can vary quite widely.
It is shown that the degree of influence of the iron impurity depends on the ratio of its
content with the content of the oxygen impurity, which in turn determines the
resulting oxygen regime of the coolant in the form of the thermodynamic
activity of the oxygen impurity. It is noted that the entire area of
practically significant changes in this parameter can be conditionally divided
into two areas: – the dominant influence of oxygen admixture (at high values of
oxygen TDA) and, accordingly, the area of the dominant influence of iron
admixture.
The main features of the flow of the analyzed mass transfer processes depending on the realized
physic-chemical state of the coolant are considered.
The analysis of the available experimental data and theoretical estimates is carried out, which
show that in the presence of an iron impurity in the HLMC, depending on the
level of oxygen TDA, the nature of the interaction of the coolant with the
surfaces of oxide films changes, as well as the behavior of solid-phase
impurities based on iron oxides changes qualitatively.
An explanation of the observed effects is proposed, which consists in the fact that in the area
of the dominant influence of iron admixture, solid-phase iron oxides in HLMC
pass from a lyophobic state to a lyophilic one.
Keywords
mass transfer, thermodynamic activity, heavy liquid metal coolant, oxygen and iron impurities,
oxides, oxygen, metal oxidation, structural steel, oxidation potential, lead, temperature, oxygen regime, oxide film
Article Text (PDF, in Russian)
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UDC 621.039.534
Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2022, issue 1, 1:14
