METHOD FOR MEASURING THE DEFLECTION OF THE TECHNOLOGICAL CHANNEL OF A NUCLEAR REACTOR Russian patent published in 2022 - IPC G21C17/17 

FIELD: measuring technologies.

SUBSTANCE: present invention relates to a method for measuring the deflection of a technological channel of a nuclear reactor. The method includes placing at least one fiber optic sensor fixed at the end of a flexible hollow carrier rod inside the central tube of a fuel assembly, supplying a light signal via fiber optic lines connected to the sensor, recording reflected light signals using a fiber optic sensor connected to the fiber optic lines of photodetector. The determination of the deflection of the technological channel of a nuclear reactor is carried out on the basis of an analysis of the parameters of the light signal. Wherein a fiber-optic sensor is used, equipped with a gravitational pendulum suspended with the possibility of deflection at the lower end of the fiber-optic sensor, a flexible hollow bearing rod is moved with a fiber-optic sensor along the central heat-generating tube, a shift of the interference pattern of the reflected light signal in the gas gap between the upper end is fixed. the surface of the gravitational pendulum and the lower end surface of fiber-optic lines connected to the photodetector and fixed on the sensor. Further, based on the profilograms of the gas gap, the magnitude and direction of the deflection of the central tube of the fuel assembly from the vertical axis are calculated, which are used to judge the presence and magnitude of the deflection of the technological channel of the nuclear reactor.

EFFECT: simplification of measurements of the deflection of the technological channel of a nuclear reactor while maintaining the measurement accuracy.

1 cl, 4 dwg