Authors & Affiliations

Lavrova O.V., Ivanov K.D., Salaev S.V., Askhadullin R.Sh., Legkikh A.Yu.
A.I. Leypunsky Institute for Physics and Power Engineering, Obninsk, Russia

Lavrova O.V. – Senior Researcher, A.I. Leypunsky Institute for Physics and Power Engineering.
Ivanov K.D. – Leading Researcher, Dr. Sci. (Tech.), A.I. Leypunsky Institute for Physics and Power Engineering.
Salaev S.V. – Chief Specialist, State Corporation “ROSATOM”, Innovation Management Unit.
Askhadullin R.Sh. – Deputy Director for Science and Technologies, Cand. Sci. (Tech.), PCTD, A.I. Leypunsky Institute for Physics and Power Engineering.
Legkikh A.Yu. – Senior Researcher, Cand. Sci. (Tech.), A.I. Leypunsky Institute for Physics and Power Engineering. 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..

Abstract

Consideration is given to physical and chemical processes in the lead coolant that circulates in the reactor primary circuit. Oxygen distribution in the circulation circuit and temperature zones is shown to depend on the ratio of the oxygen supply rate from the coolant to the rate of its removal from the coolant as a result of structural steel surface oxidation reaction. With the increased oxygen concentration in the coolant (C0≥1·10-6%mass), the rate of its removal from the coolant is insignificant and iso-concentration distribution is in place. When oxygen concentration goes down, the iron equilibrium activity significantly increases, both in the iron oxide produced and in the coolant, thus resulting in a significant deviation from the oxygen iso-concentration distribution on the cooling line. When the coolant is cooled the solid phase of nonstoichiometric magnetite Fe3+δO4 is formed. Value of δ is a function of temperature and oxidation potential of external environment. The value can change in limits from 1 (at the temperature of a hot zone) till 0 (when the temperature is decreased). Formating oxides on the base of iron possess a stablility in synthesis conditions only and it is decomposed on stable phases when the temperature decrease: iron and stoichiometric magnetite with releasing of the oxygen in the external environment, that is in the coolant, up to saturation at the temperature of a cold zone.

Keywords
lead, coolant, oxygen, structural steel, iron, oxidation, thermodynamic activity, experiment, circulation, temperature distribution, oxygen distribution

Article Text (PDF, in Russian)

References

[Thernodynamic Constansts of Individual Matters]. ?oscow, Nauka Publ., 1978–1982, vol. I-IV.

11. Ivanov K.D., Martynov P.N. Opyt resheniya voprosov tekhnologii svinets-vismutovogo teplonositelya pri ekspluatatsii APL vtorogo pokoleniya [The Experience in Solution of Problems of Lead-Bismuth Coolant Technology during Second Generation Nuclear Submarines Operation]. Trudy konferentsii “Tyazhelye zhidkometallicheskie teplonositeli v yadernykh tekhnologiyakh” [Proc. Conf. “Heavy Liquid Metal Coolants in Nuclear Technologies”]. Obninsk, 1999, vol. 2, pp. 709.

UDC 621.039.534.6

Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants", 2017, issue 3, 3:7