Instruments and Systems: Monitoring, Control, and Diagnostics Annotation << Back On the expansion of the inter-testing interval of thermocouples of systems of in-reactor control of VVER-1000 P.A. ZAITSEV, P.P. OLEINIKOV, S.V. PRIYMAK, V.C. TURCHANINOV, K.N. CHERVYAKOV The results of studies of the drift of the calibration characteristics of thermoelectric converters (TEPs) in the process of long-term exposure to reactor radiation and temperature in support of the expansion of the calibration interval for the TEP of the In-Reactor Control System (VVER) of NPPs with VVER-1000 reactors are considered. It is shown that in order to create a metrologically reliable model of drift in support of the expansion of the MPI, the results of periodic verification of the CMP thermocouples in quasi-isothermal regimes of power units should be used in conditions of maximum closeness of verification and operational temperature gradients. Keywords: thermoelectric transducer, radiation, temperature, drift of characteristics, intertesting interval. Contacts: E-mail: npo@sialuch.ru Pp. 44-51.