FIELD: nuclear power engineering. ^ SUBSTANCE: proposed device primarily designed for checking geometrical parameters of process channels of type RBMK reactors has measuring probe incorporating transducer and signal transmitter communicating with signal receiver, means for moving probe lengthwise of channel, and power supply; transducer is, essentially, hydraulic unit made in the form of jet-pipe transducer and signal transmitter is acoustic unit; nuclear reactor refueling machine is used as probe moving means, working medium of channel and channel walls or working medium of channel and walls of mentioned machine body function as communication line; power supply is hydraulic unit made in the form of throttle mounted on bottom part of measuring probe and vertically mounted pressure header whose inlet is disposed below throttle. ^ EFFECT: ability of metering geometrical parameters of sealed channel in the course of refueling operations. ^ 1 cl, 5 dwg
