Authors & Affiliations

Ivanov K.D., Niyazov S.-A.S., Cheporov R.Yu.
A.I. Leypunsky Institute for Physics and Power Engineering, Obninsk, Russia

Ivanov K.D. – Leading Researcher, Dr. Sci. (Techn.), A.I. Leypunsky Institute for Physics and Power Engineering.
Niyazov S.-A.S. – Senior Researcher, A.I. Leypunsky Institute for Physics and Power Engineering. Contacts: 1, pl. Bondarenko, Obninsk, Kaluga region, Russia, 249033. Tel.: +7(484) 399-44-40; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..
Cheporov R.Yu. – Engineer technologist, A.I. Leypunsky Institute for Physics and Power Engineering.

Abstract

The simplest method of increasing the information content of the control of the thermodynamic activity (TDA) of oxygen in heavy liquid-metal heat carriers (HLMC) is the change in the temperature of the coolant, during which the redistribution of oxygen between chemically active impurities under these conditions, which in turn affects the nature of the change in the TDA of oxygen, and can be recorded experimentally.
This technique can be used in a variety of ways. In this paper, two methods are used. In the condi-tions of static installation the method of periodic switching off of heating of all volume of the heat carrier was applied. In the conditions of non-isothermal circulation stand the method of oxygen TDA measurement in different temperature zones was used.
The experimental data on the nature of the temperature dependence of the readings of oxygen TDA sensors are obtained, both in the cases of the predominance of the deoxidizing action of the source of metal impurities and in the cases of the predominance of the oxidizing action of internal oxygen sources.
It is shown that the methods used in the work for determining the numerical values of temperature dependences of the change of oxygen TDA in the HLMC allow to obtain additional information about the physical and chemical state of the coolant, which is a function of the content of chemically active impurities in the coolant.
It was found that the influence of iron impurity on the state of the coolant is characterized by the presence of the region of relative insensitivity of the temperature dependence of oxygen TDA at high thermodynamic activity of oxygen, while the influence of hydrogen impurity in this area is high enough.
A more detailed determination of the nature of the effect of hydrogen impurities in the entire range of changes in the oxygen TDA requires additional experiments.
The experimental results confirm the theoretical background.

Keywords
thermodynamic activity of oxygen, heavy liquid metal coolant, solid electrolyte, gydrogen, diffusion output of iron, oxide film, partial pressure, lead, lead-bismuth, thermocycling

Article Text (PDF, in Russian)

References

UDC 621.039.534

Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2018, issue 5, 5:1