INDICATOR OF POSITION OF ABSORBING ROD IN REACTOR CORE Russian patent published in 2015 - IPC G01H9/00 G01H3/00 

FIELD: measurement equipment.

SUBSTANCE: position indicator of an absorbing rod in a reactor core of RNMK-1000 type comprises a servodrive, which includes the following serially connected components: a DC motor, a step-down reducer with an electromagnetic coupling of moderating vibration, an electromagnetic coupling of rod stopping, a transport drum with a metal tape, at the end of which there is an absorbing rod fixed, a reducer with a non-linear gear ratio and a selsyn sensor. At the same time the selsyn sensor via a cable route is connected in series with a unit of resistive dividers of phase voltages, closing the phase windings of selsyn sensor rotor synchronisation, a computing complex and an address decoder converting phase voltages of selsyn sensor synchronisation windings into a digital code, which characterizes address and position of the absorbing rod in the reactor core. This information is transmitted to a mnemonic table of the rod position indicator, and via an additional slot through the RS-485 interface arrives to a local information network of a power unit.

EFFECT: increased reliability, accuracy of registration of rod position, increased legibility of measurement results display and reduced power intensity.

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