The program for enlarging the capacity of the operational power units of NPP–VVERs is driving improvements in metrological assurance for reactor thermometry. The key problem in monitoring the temperature of the primary coolant is still keeping track of the error due to radiative heating of the working end of a thermocouple. A dynamic balance-sheet ratios method is proposed for its solution based on the thermal inertia of a thermocouple in the measuring position and applying the theory of generalized functions. The dependence of the error on the thermal inertia of a thermocouple, which is determined by the degree of shortfall (the quality of the thermal contact) of the working end to the mounting socket of the temperature monitoring channel, is established. The problems involved in modernizing the monitoring of temperature control at NPP–VVERs are formulated.
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Translated from Atomnaya Énergiya, Vol. 132, No. 4, pp. 210–213, April, 2022.
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Priymak, S.V., Oleinikov, P.P., Soldatkin, D.M. et al. Methodological Basis for the Modernization of Thermal Control of NPP–VVER. At Energy 132, 219–222 (2022). https://doi.org/10.1007/s10512-023-00931-6
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DOI: https://doi.org/10.1007/s10512-023-00931-6