Device for measuring the thickness of the fuel elements

 

The invention relates to the field of nondestructive testing, namely, devices for measuring the shell thickness and distribution of the middle layer of fuel elements of nuclear reactors using ionizing radiation. The invention consists in that the lodgement 7 truck for fuel elements made in the form of two Maltese crosses with stepper drive, rigidly interconnected by a shaft, the sources and detectors of ionizing radiation mounted on a gear rack and pinion gears 4 and 6 with stepper drives and rod 2 provided with adjusting device 5, is made of two rotating cylindrical steam, installed perpendicular to each other. 1 Il.

The invention relates to the field of nondestructive testing, namely, devices for measuring the shell thickness and distribution of the middle layer of fuel elements of nuclear reactors using ionizing radiation.

A device for measuring pipes (see S. C. Rumyantsev. Radiation defectoscopy. M: Atomizdat, 1974, S. 400) consisting of a source and detector of ionizing radiation. The disadvantage of this device is the low accuracy of the led on the I thickness measurement of fuel elements (see patent RU No. 2069838, G 01 15/02, priority 25.04.94) prototype containing the sources and detectors of ionizing radiation, the mechanisms of their movements, mounted on the rod attached to the base, the mechanisms of displacement and rotation of the fuel elements, a system for measuring and registration, the lack of which is the low accuracy settings and measurements.

An object of the invention is to improve the accuracy of tuning and measuring the shell thickness and distribution of the middle layer of fuel elements of nuclear reactors.

The problem is solved in that the device for measuring the thickness of the fuel elements, containing the sources and detectors of ionizing radiation, the mechanisms of their movements, mounted on the rod, mechanism for rotating and moving fuel elements installed on the boom and trolley system of measuring and recording, according to the invention the bed of the truck for fuel elements made in the form of two Maltese crosses with stepper drive connected rigidly to each other via a shaft, the sources and detectors measure the membranes are installed on the gear rack and pinion gears with stepper drives and rod provided with adjusting device>the shown set of signs is new, not known from the prior art and solves the problem, because the execution of lodgement in the form of a Maltese crosses eliminates liners for various sizes of products and to provide automatic installation of products on the geometrical axis. The implementation of mechanisms for moving sources and detectors measuring membranes eliminates the centering sleeve and the damper of vibrations as excluded longitudinal load that occurred previously when the contact of the fuel element with them. The use of the adjusting device in the fastening rod accurately and promptly to combine the geometrical axis of the rod and fuel cells and to configure the control samples.

The invention is illustrated in the drawing, which schematically shows the device for measuring the thickness of the fuel elements.

The device consists of a base 1 on which is installed the rod 2, truck 3, the moving mechanism 4 sources and detectors measure the outer casing. The rod 2 is attached to the base 1 via the adjusting device 5, is made of two rotating cylindrical steam installed perpendicularly 2 on the geometrical axis of the fuel elements when it is configured as reference samples.

On the rod 2 installed mechanisms 6 move the sources and detectors measure the internal fuel cladding and active layer thickness, the rotation mechanism 8 fuel elements. On the trolley 3 is the mechanism 9 of its longitudinal movement. On the trolley 3 is fixed to the cradle 7, made in the form of two Maltese crosses with stepper drive connected rigidly to each other via a shaft. As the movement mechanisms 4 and 6 are toothed rack and pinion with stepper drive. Sources and detectors for measuring the thickness of the fuel element cladding is a compact design, combining a source of beta radiation in the collimator and small-sized semiconductor detector of electrons.

At the end of the rod is fixed to the container with a source of gamma radiation detectors on the frame of the mechanism 4, which measures the distribution of thicknesses of the active layer of the fuel element.

The dimension of the uneven distribution of the fuel layer is gamma-ray absorption method, the thickness measurement of shell - method of registering the reflected fuel layer and a weakened shell of beta radiation.

Measuring tract uneven distribution of the top is the source of gamma radiation With57and the gamma radiation detector of the type 6931-17, located on the different parties controlled the verge, the amplifier-shaper, the amplitude detector blocks high-voltage and low-voltage power supply.

The measuring paths of the thickness of the inner and outer shells are composed of three channels control the thickness of the inner shell and the three channels of the thickness of the outer shell, which include PEEP enclosed in the same housing at an angle of 45-60the source of beta radiation Sr90the detector, consisting of a stilbene crystal and the photomultiplier tube, and located on one side controlled the verge of the amplifier-shaper, the amplitude discriminator, blocks of high-voltage and low-voltage power supply.

The dimension of the uneven distribution of the fuel layer.

The flux of gamma rays from the source of Co57passing through a controlled face, weakened and is registered by the detector. The coefficient of uneven distribution of the fuel layer is defined as

Tot min=Nimin/N, Kt max=Nimax/N,

where Nimin- the minimum rate along the length of the face,

N - the average rate for the product.

Measurement of the thickness of the shells.

Thread beta radiation from stockly transformation d=f(x), obtained through certified standard samples of shell thickness, is calculated thickness of the shell at this point.

The outputs from all measuring channels are connected with the registration system through the block matching with counters TI 0-10 located in the ISA slots system unit industrial IBM - compatible computer, and further processed according to the specified algorithm. After measuring the required parameters are calculated with printing the output document of the established form.

The device operates as follows.

The computer operator switches on the device. The fuel element is mounted on the carriage 3 in the lodgement 7 on the verge of Maltese crosses, depending on the diameter of the fuel element.

The actuator 9, the trolley moves in the measurement zone. When reaching this zone further movement occurs with a given scan rate, and primary converters using mechanisms 4 and 6 are in contact with the measured surface of the fuel elements.

When driving in the area of measurement is the measurement of irregularity of the surface density of the fuel layer due to the attenuation of gamma radiation and the measurement of the thicknesses of the outer and inner obkonchennye measurement, when the fuel element is a measurement in the forward direction includes the actuator 8, and the fuel element is rotated 180and moves in the opposite direction, completing the measurement process.

Controlled fuel element is removed from the truck and install the next, and the cycle repeats.

Thus, the use of this device, in addition to improve the accuracy of settings and measurements, allows to increase the reliability and efficiency of obtaining measurement results.

Claims

Device for measuring the thickness of the fuel elements, containing the sources and detectors of ionizing radiation, the mechanisms of their movements, mounted on the rod, mechanism for rotating and moving fuel elements installed on the boom and trolley system of measuring and recording, characterized in that the bed of the truck for fuel elements made in the form of two Maltese crosses with stepper drive, rigidly interconnected by a shaft, the sources and detectors of ionizing radiation mounted on a gear rack and pinion gears with stepper drives and x perpendicular to each other.

 

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FIELD: electronics.

SUBSTANCE: method includes recording number of particles emitted by radioactive layer on basis of number of voltage or current pulses recorded by counting device, then to measuring detector a flow of ionizing radiation is directed from calibrating standard electrode and also registered is number of particles, position of covered electrode is change no less than two times, by turning it in horizontal plane around its axis for arbitrary angle, while repeating measurement of pulses number, while measurement time is selected to be such that number of recorded pulses was no less than 3600 pulses for each measurement position, and then selection of necessary number of electrodes is calculated for forming electrode system in chamber.

EFFECT: higher precision, higher safety.

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