DEVICE FOR CONTROLLING GAS GAP OF GRAPHITE-URANIUM REACTOR PROCESS CHANNEL Russian patent published in 2009 - IPC G21C17/06 

FIELD: nuclear physics.

SUBSTANCE: invention relates to operation of graphite-uranium reactors. The device for controlling the gas gap of the process channel of a graphite-uranium reactor has a calibration zirconium pipe fitted on the channel pipe of the process channel. On the outer surface of the pipe there is a block of graphite rings with fixed gaps, and a vertically movable electromagnetic radiation sensor is placed coaxially inside the pipe. The sensor is made in form of two measuring coils, compensated on the surface a uniform conducting medium, and one exciting coil above which there is a short-circuited winding made from non-magnetic current conducting material. The coils are mounted on a permalloy flat-topped magnetic conductor. The device also has a mechanism for moving the sensor and an electronic signal processing unit which is connected to the sensor and a computer. Measuring coils are accordingly connected to the electronic signal processing unit through an amplitude-phase balancing bridge circuit of the sensor, and the exciting coil is connected the electronic signal processing unit through an exciting current stabiliser.

EFFECT: more accurate control when measuring gas gaps due to possible readjustment of the sensor in the control zone.

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