Authors & Affiliations
Blokhin V.A., Borisov V.V., Ilicheva N.S., Kamaev A.A., Krasikova E.A., Levin O.E., Medvedev N.F., Miazdrikova O.I., Pahomov I.A., Poplavskiy V.M., Sidorov D.G., Skvorsov N.S., Solovyov A.V., Stroev A.A.
A.I. Leypunsky Institute for Physics and Power Engineering, Obninsk, Russia
Blokhin V.A. – Leading Researcher, Cand. Sci. (Tech.), A.I. Leypunsky Institute for Physics and Power Engineering. Contacts: 1, pl. Bondarenko, Obninsk, Kaluga region, Russia, 249033. Tel.: (484)399-84-79; e-mail:
Borisov V.V. – Deputy Head of laboratory, A.I. Leypunsky Institute for Physics and Power Engineering.
Ilicheva N.S. – Senior Researcher Cand. Sci. (Chem.), A.I. Leypunsky Institute for Physics and Power Engineering.
Kamaev A.A. – Deputy Director-General on nuclear power, Chief of department, Cand. Sci. (Tech.), A.I. Leypunsky Institute for Physics and Power Engineering.
Krasikova E.A. – Research engineer, A.I. Leypunsky Institute for Physics and Power Engineering.
Levin O.E. – Head of Laboratory, A.I. Leypunsky Institute for Physics and Power Engineering.
Medvedev N.F. – Team Leader, A.I. Leypunsky Institute for Physics and Power Engineering.
Miazdrikova O.I. – Engineer, A.I. Leypunsky Institute for Physics and Power Engineering.
Pahomov I.A. – Head of Laboratory, A.I. Leypunsky Institute for Physics and Power Engineering.
Poplavskiy V.M. – Deputy Director, Dr. Sci. (Tech.), Professor, A.I. Leypunsky Institute for Physics and Power Engineering.
Sidorov D.G. – Team Leade, A.I. Leypunsky Institute for Physics and Power Engineering.
Skvorsov N.S. – Chief Engineer, A.I. Leypunsky Institute for Physics and Power Engineering.
Solovyov A.V. – Lead Engineer, A.I. Leypunsky Institute for Physics and Power Engineering.
Stroev A.A. – Research scientist, A.I. Leypunsky Institute for Physics and Power Engineering.
Abstract
The object of research is a model of an oxygen sensor for continuous core monitoring oxygen in sodium. The principle of operation of the oxygen sensor is to measure the EMF (electromotive force) generating between two oxygen electrodes with different chemical activity of oxygen, separated from each other by an electrolyte with ionic oxygen conductivity. One electrode is indium saturated with oxygen and the other is sodium with the unknown oxygen content. As a solid electrolyte, the hafnium dioxide stabilized with gadolinium oxideis used, which is hermetically sealed in a ceramic insulator of reinforced steel. The measurement of signal of the oxygen sensor was carried out by the inverter IT 2512. Oxygen sensor test of was carried out in the flow of the sodium circulating sodium stand in the range of temperatures 400÷480°C (mainly at a temperature of 48°C), the coolant flow rate in the range 10÷230 l/h and the oxygen concentration in the range of 0.1÷14 ppm (mostly in the range of 0.47÷0,9 ppm) for ~6000 hours. The contributiondescribes the circulating sodium stand. The variation of oxygen concentration in sodium was carried out by direct metered supply of oxygen (air), h ydrogen in the system, and also periodic variation of temperature of the cold traps during the test period (experiment). The EMF of the oxygen sensor with a higher oxygen content in sodium increased. The measured oxygen sensordata in different time periods of the tests coincided overlapped, which proves the stability of its readings. The readings of oxygen sensoradequately varied with the temperature change. With increasing (decreasing) the temperature of the sodium the electromotive force of the oxygen sensor was changed withisoconcentration of oxygen in sodium of the circulation loop. After 90 thermal cycles in the range of 300÷400°C ata rate of 30÷40 l/h (when draining and filling the coolant circuit 50÷200 l/h) characteristics of the sensor did not change. The sensitivity of the oxygen sensor was in the range from 8 to 13 mV/ppm at the temperature of 480°C. After long-term tests (~6000 hours) in a sodium flowthe oxygen sensor did not changed the dimentions and shape of the end surface of the solid electrolyte.
Keywords
sodium, electrochemical method, oxygen, stabilized hafnium dioxide, the oxide of gadolinium, cold trap, circulating sodium stand, sensor, oxygen detection
Article Text (PDF, in Russian)
UDC 621.039.534.63