Authors & Affiliations

Beznosov A.V., Bokova T.A., Bokov P.A., Lvov A.V., Prikazchikov G.S., Gadetov V.A.
Nizhny Novgorod State Technical University. R.E. Alekseeva, Nizhny Novgorod, Russia

Beznosov A.V. – Professor, Honored Worker of Science of the Russian Federation, Dr. Sci. (Tech.), Institute of Nuclear Power Engineering and Technical Physics, Nizhny Novgorod State Technical University. R.E. Alekseeva.
Bokova T.A. – Associate professor, Cand. Sci. (Tech.), Institute of Nuclear Power Engineering and Technical Physics, Nizhny Novgorod State Technical University. R.E. Alekseeva. Contacts: 24, Minina st., Nizhny Novgorod, Russia, 603155. Tel.: +7(910)393-18-94; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..
Bokov P.A. – Senior Lecturer, Cand. Sci. (Tech.), Institute of Nuclear Power Engineering and Technical Physics, Nizhny Novgorod State Technical University. R.E. Alekseeva.
Lvov A.V. – Engineer, Institute of Nuclear Power Engineering and Technical Physics, Nizhny Novgorod State Technical University. R.E. Alekseeva.
Prikazchikov G.S. – Post-graduate student, Institute of Nuclear Power Engineering and Technical Physics, Nizhny Novgorod State Technical University. R.E. Alekseeva.
Gadetov V.A. – Master of the first year of training, Institute of Nuclear Power Engineering and Technical Physics, Nizhny Novgorod State Technical University. R.E. Alekseeva.

Abstract

A significant difference between the operation of the circulation circuits and the high-temperature lead coolant of the stands (installations) from the reactor circuits is the fact that due to frequent depressurization of the stand equipment according to test programs, repair and preventive maintenance operations, frequent feeding of argon containing oxygen admixture, etc. in the outline of stands, As a rule, lead oxides accumulate in the form of slag deposits at free levels, on walls, in stagnant zones. To maintain the normal operating condition of the circuit and coolant in the outline of the stands, it is often necessary to perform operations for the reduction of lead oxides by an argon-hydrogen mixture or hydrogen.
In the reactor circuit, in the absence of an emergency condition of "inter-loop leakage of PG" and the absence of opening of the contour volumes during repairs, the accumulation of lead oxides is not predicted. On the contrary, it is predicted that it is necessary to introduce into the coolant and oxygen circuit by dissolving the solid phase of lead oxides, introducing gaseous oxygen into gas mixtures or the like.
A gas-phase method for the regulation of thermodynamically active oxygen in HLMC, recommended by OKBM, OKB GP and IPPE for the operation of all reactor installations of serial submarines of projects 705, 705K and the KM-1 stand is used in the FT-4 stand of the NSTU.
- In the event that the oxygen content in the coolant and in the circuit increases above the established norms, a gaseous hydrogen-containing mixture (or hydrogen) is fed into the circuit until the oxygen in the coolant returns to the established rate, after which the supply of the reducing gas ceases.
- In the event that the oxygen content in the coolant decreases below the established norms, an oxygen-containing gas mixture is fed into the circuit until the oxygen in the coolant returns to the established rate, after which the supply of the oxidizing gas ceases.
Long-term experience of operation of the FT-4 stand of the NSTU showed high efficiency of the regular system for cleaning the HLMC circuit from heat-carrier oxides and controlling the oxygen content in the lead coolant at the stand.

Keywords
HLMC, coolant technology, two-component mixture, lead, oxide accumulation, gas-phase method, thermodynamic activity, gas mixture, coolant level, FT-4 stand

Article Text (PDF, in Russian)

References

UDC 621.039

Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants", 2017, special issue, 5:1