EDN: HMBBEA
Authors & Affiliations
Legkikh A.Yu., Askhadullin R.Sh., Ivanov K.D., Lavrova O.V.
A.I. Leypunsky Institute for Physics and Power Engineering, Obninsk, Russiaia
Askhadullin R.Sh. – Head of Department of Physical and Chemical Engineering, Cand. Sci. (Tech.), Assistant Professor. Contacts: 1, pl. Bondarenko, Obninsk, Kaluga region, Russia, 249033. Tel.: (484) 399-80-73; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..
Legkikh A.Yu. – Leading Researcher, Cand. Sci. (Tech.).
Ivanov K.D. – Leading Researcher, Dr. Sci. (Tech.).
Lavrova O.V. – Senior Researcher.
Abstract
The use of heavy liquid metal coolants requires special measures to ensure the reliable and safety operation of nuclear reactors with these coolants. These measures include monitoring and maintaining the oxygen regime.
To control the oxygen regime in HLMC, electrochemical sensors of oxygen activity (OAS) have been developed and experimentally substantiated. These sensors make it possible to continuously measure the difference in electric potentials between the reference electrode and the controlled medium. Together with the built-in thermocouples, the sensors uniquely characterize the thermodynamic conditions at the point of their location. To date, the developed OAS designs have been certified as a type of measuring instruments.
Meanwhile, historically, the operating standards for the content of oxygen impurities are expressed as a range of concentration of dissolved oxygen (% wt.), which should be supported by the available control means.
The transition from the measured OAS indications to the mass concentration is carried out by recalculating the EMF in % wt. according to the accepted formulas, including the Nernst equation and the temperature dependence of the solubility of oxygen in a given coolant.
In this article authors consider a historical retrospective regarding the choice of the normalized indicator of the oxygen regime (% wt.) of a heavy liquid metal coolant, and also substantiate proposals for changing it during the operation of a new generation of nuclear power plants.
Keywords
heavy liquid metal coolant, measurements, normalized parameter, concentration, oxygen regime, thermodynamic activity, electrochemical potential, nuclear reactor
Article Text (PDF, in Russian)
References
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UDC 621.039.534.6
Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2024, no. 1, 1:12
