CN110595316B - Device and method for checking overall performance of burnable poison assembly after irradiation - Google Patents

Abstract

The invention discloses a device and a method for inspecting the integral performance of a burnable poison assembly member after irradiation. The invention solves the problems of large risk, low efficiency and more personnel needing to participate in the inspection operation of the assembly part pool edge similar to a burnable poison component. The device can perform appearance inspection on a high-radioactivity assembly on site, accurately measure small dimensional change after irradiation, and has high efficiency, safety and reliability in measurement.

Description

Device and method for checking overall performance of burnable poison assembly after irradiation

Technical Field

The invention relates to a nuclear industry detection technology, in particular to a device and a method for detecting the overall performance of a burnable poison assembly member after irradiation.

Background

The burnable poison assembly is an important component in a pressurized water reactor fuel assembly, and the main functions of the burnable poison assembly are core power peak control and moderator temperature coefficient control. In the process of developing a certain fuel rod material, zirconium alloy materials of different types are prepared into irradiation sample tubes, the irradiation sample tubes are assembled into an assembly part similar to a burnable poison and inserted into a fuel assembly for irradiation test, and after a plurality of test cycles, the small change of the size of the irradiated sample assembly part needs to be measured, such as the small change of the irradiation growth amount and the thickness of an oxide film.

At present, the function of detection equipment similar to burnable poison assemblies is single, and an integral performance detection device is not provided. In addition, the existing special inspection equipment has high risk of operation of inspection of the assembly at the pond edge, low efficiency and more personnel needing to participate.

Disclosure of Invention

The invention aims to provide an integral performance inspection device for a burnable poison assembly member after irradiation, which can perform integral inspection after the burnable poison assembly member is irradiated and has the advantages of high measurement efficiency, safety and reliability.

In addition, the invention also provides a detection method based on the overall performance inspection device

The invention is realized by the following technical scheme:

a device for checking the overall performance of a burnable poison assembly after irradiation comprises a support, a detection system and a main rack rail, wherein a rotating mechanism is arranged at the top of the support and used for fixing the assembly, the main rack rail is arranged in parallel with the support, a movable trolley is arranged on the main rack rail and is controlled and driven by a main rack electrometer system, a first high-definition color CCD is arranged on the movable trolley, the detection system comprises a quick connection mechanism, an X platform, a Y platform and a Z platform are sequentially arranged on the quick connection mechanism from bottom to top, the X platform and the Y platform are controlled by the main rack electrometer system to move in an X-axis direction and a Y-axis direction, the Z platform is controlled by the detection electrometer system to move in the Z-axis direction, the detection system further comprises a measuring rod arranged in parallel with the Z platform, and a second high-definition color CCD and an anti-radiation camera are arranged on the measuring rod, the utility model discloses a high clear color CCD's of measurement mechanism, including Z platform, be provided with little Y platform on the Z platform, be provided with measuring mechanism on the little Y platform, measuring mechanism's tip rotates and is provided with restraint mechanism, restraint mechanism include with irradiation appearance pipe complex shelves pole, be provided with on the little Y platform with measuring mechanism complex eddy current sensor, be provided with on the eddy current sensor with irradiation appearance pipe complex gyro wheel, detecting system still include with measuring mechanism complex third high clear color CCD, with support parallel arrangement's scale.

The rotating mechanism is in the prior art and comprises a pneumatic motor, a worm and gear mechanism and a Z-shaped rotating rod, wherein the pneumatic motor drives the worm to further drive the worm gear and the Z-shaped rotating rod connected with the worm gear during movement, so that the rotating rod can rotate for 360 degrees. The X/Y/small Y platform is characterized in that the transmission structure of the X/Y/small Y platform is the prior art, the X/Y/small Y platform is composed of a pneumatic motor, a large chain wheel, a small chain wheel, a chain, a stainless steel wire bar module, a sliding rod, a linear bearing and the like, and the Z platform is driven by a worm and gear mechanism instead of the chain wheel. During movement, the X/Y/small Y platform drives the small chain wheel and the chain through the pneumatic motor, further drives the large chain wheel, and drives the screw rod module connected with the large chain wheel, so that X/Y-direction movement of the detection platform is realized; the Z platform drives the worm through the pneumatic motor, further drives the turbine, and drives the screw rod module connected with the turbine, so that Z-direction movement of the detection platform is realized.

When the device is used, the bracket is arranged in the water pool and used for storing the detected component, and the device is not connected with a detection system. The detection system is arranged on the movable trolley and can realize full coverage of the detected component in the vertical direction. The movable trolley slides on the track and is driven by a transmission mechanism (namely a large Z system) on the main working platform.

The invention drives the X platform, the Y platform, the Z platform and the small Y platform to move through the main platform electrical instrument system and the detection electrical instrument system, and the movement of the moving trolley on the main platform track is matched, so that the movement of the first high-definition color CCD, the second high-definition color CCD, the third high-definition color CCD and the anti-radiation camera in the X axis direction, the Y axis direction and the Z axis direction is realized, and the small Y platform is provided with the measuring mechanism and the constraint mechanism, so that the detection of the irradiation sample tube is realized.

The invention can complete the performance detection of all irradiation sample tubes of the assembly part only by one-time insertion, can carry out integrity inspection after irradiation of the burnable poison assembly part, and has the advantages of high efficiency, safety and reliability in measurement.

Further, the support comprises a lower base body, the lower base body is installed at the bottom of the well, an upper base body is vertically arranged on the lower base body, and the rotating mechanism is arranged at the top of the upper base body.

Furthermore, the rotating mechanism is provided with a rotating long handle in a matching manner, and the rotating mechanism is provided with a positioning hole matched with the rotating long handle.

Further, the restraint mechanism is driven to rotate by the air cylinder.

Further, the calibration scale is installed on a main working platform, and the main working platform is arranged above the support.

Furthermore, a railing and a transmission mechanism matched with the main rack rail are arranged on the main working platform.

Further, the top of the bracket is provided with a horizontal measuring instrument.

A method of testing a burnable poison assembly post-irradiation integrity performance inspection device, comprising the steps of:

1) and a mounting assembly: inserting the mounting assembly into the rotating mechanism;

2) and detecting: the mounted assembly was subjected to appearance inspection, irradiation growth amount measurement, and oxide film thickness measurement in this order.

Further, leveling measurements are taken of the top of the rack when the assembly is installed, ensuring that the levelness is less than 0.5 °.

Further, the step of appearance inspection is:

A1) driving the moving trolley to move on the main rack rail through the main rack electrical instrument system until the first high-definition color CCD moves to a position opposite to the upper end of the assembly part, recording a video by adopting the first high-definition color CCD, and driving the moving trolley through the main rack electrical instrument system again until the first high-definition color CCD moves to a position opposite to the lower end of the assembly part by adopting an automatic mode;

B1) rotating the rotating mechanism, checking the other side surface of the assembly part, and finishing 4-surface appearance video recording of the assembly part;

C1) amplifying and analyzing the video;

the measuring steps of the irradiation growth amount are as follows:

A2) moving the Y platform through the main stand electrometer system, moving the second high-definition color CCD to the rear end, and adjusting the light source to ensure that the calibration scale and the scales of the irradiation sample tube are clearly visible;

B2) moving the X platform through the main stand electrometer system, and calibrating the stay wire scale by matching with a calibration scale;

C2) moving the Z platform through the main stand electrometer system, moving the second high-definition color CCD to the upper scale of the irradiation sample tube, enabling the upper scale to be positioned in the middle of the screen, and recording the value of the stay wire scale at the moment;

D2) moving the Z platform through the main stand electrometer system, moving the second high-definition color CCD to the lower scale of the irradiation sample tube, enabling the lower scale to be located in the middle of the screen, and recording the value of the stay wire scale at the moment;

E2) converting the distance between the upper scale and the lower scale by the calibration value in the step B2), wherein the value is the distance between the two scales after irradiation;

F2) taking the difference between the value in the step E2) and the standard value as the irradiation growth amount;

J2) rotating the rotating mechanism, and repeating the steps C2) to F2) to complete the irradiation growth measurement of the irradiation sample tube in the rest assembly;

the oxide film thickness measurement steps were:

A3) moving the X platform through the main rack electrometer system, enabling the calibration rod to be located in the middle of the roller by means of the anti-radiation camera, moving the Y platform, enabling the roller to be in contact with the calibration rod until a measuring probe of the measuring mechanism and the roller are tightly attached to the calibration rod, and calibrating the oxidation film sensor;

B3) moving the Y platform through the detection electric instrument system, and driving the measuring mechanism and the constraint mechanism to be inserted into the gap between the adjacent irradiation sample tubes by the Y platform;

C3) judging whether the constraint mechanism is in place or not through a proximity switch and cooperating with the observation of a third high-definition color CCD;

D3) starting an air cylinder on the constraint mechanism, rotating the constraint mechanism by 90 degrees, and enabling a gear lever on the constraint mechanism to be positioned behind the irradiation sample tube to be measured;

E3) moving the small Y platform, and further driving the measuring mechanism to move forward, so that a measuring probe and a roller of the measuring mechanism are tightly attached to the irradiation sample tube to be measured;

F3) moving the Z platform through a main platform frame electrometer system to measure the thickness of the oxide film;

J3) and rotating the rotating mechanism, and repeating the steps B3) to F3) to finish the measurement of the thickness of the oxide film of the irradiation sample tube in the rest assembly.

Compared with the prior art, the invention has the following advantages and beneficial effects:

1. the invention can carry out appearance inspection on the assembly with high radioactivity on site, and accurately measure the tiny size change after irradiation.

2. The invention has no direct contact with human body in the measuring process, and the invention measures the tiny size change by the eddy current sensor and the image method, thereby the detection is safer, more efficient and more reliable.

3. The invention can complete the performance detection of all the irradiation sample tubes of the assembly part only by one-time insertion, greatly reduces the damage probability of the assembly part, simultaneously reduces the number of matched personnel of a nuclear power plant, and does not need to stay in a control area for a long time.

4. The self-contained level measuring instrument can monitor the levelness of the bracket in real time and reduce the probability of scraping the assembly part to the minimum.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a schematic diagram of the present invention;

FIG. 2 is a schematic structural diagram of an overall performance inspection apparatus;

FIG. 3 is a schematic diagram of the detection system;

FIG. 4 is a schematic of the oxidation measurement of the present invention.

Reference numbers and corresponding part names in the drawings:

1-main-gantry electrical instrument system, 2-railing, 3-rotary long handle, 4-main working platform, 5-transmission mechanism, 6-main-gantry rail, 7-detection electrical instrument system, 8-Z platform, 9-small Y platform, 10-measuring mechanism, 11-constraint mechanism, 12-third high-definition color CCD, 13-radiation-resistant camera, 14-second high-definition color CCD, 15-X platform, 16-Y platform, 17-quick connection mechanism, 18-mobile trolley, 19-roller, 20-first high-definition color CCD, 21-lower base, 22-upper base, 23-assembly piece, 24-horizontal measuring instrument, 25-rotary mechanism, 26-calibration scale, 27-irradiation sample tube, 28-eddy current sensor.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.

Example 1:

as shown in fig. 1-4, the device for inspecting the integral performance of a burnable poison assembly after irradiation comprises a support, a detection system and a main rack rail 6, wherein the support comprises a lower base 21, the lower base 21 is installed at the bottom of a well, an upper base 22 is vertically arranged on the lower base 21, a rotating mechanism 25 is arranged at the top of the upper base 22, a horizontal measuring instrument 24 is arranged at the top of the support, the rotating mechanism 25 is used for fixing the assembly 23, the rotating mechanism 25 is provided with a long rotating handle 3 in a matching manner, the rotating mechanism 25 is provided with a positioning hole matched with the long rotating handle 3, when the rotating mechanism 25 is rotated, the long rotating handle 3 is inserted into the positioning hole, the main rack rail 6 and the support are arranged in parallel, a movable trolley 18 is arranged on the main rack rail 6, and the movable trolley 18 is controlled and driven by the main rack electrical instrument, the mobile trolley 18 is provided with a first high-definition color CCD20, the detection system comprises a quick connection mechanism 17, the quick connection mechanism 17 is sequentially provided with an X platform 15, a Y platform 16 and a Z platform 8 from bottom to top, the X platform 15 and the Y platform 16 are controlled by a main platform electric instrument system 1 to move in the X axis direction and the Y axis direction, the Z platform 8 is controlled by a detection electric instrument system 7 to move in the Z axis direction, the detection system further comprises a measuring rod arranged in parallel with the Z platform 8, the measuring rod is provided with a second high-definition color CCD14 and an anti-radiation camera 13, the Z platform 8 is provided with a small Y platform 9, the small Y platform 9 is provided with a measuring mechanism 10, the end part of the measuring mechanism 10 is provided with a constraint mechanism 11 in a rotating mode, the constraint mechanism 11 is driven by an air cylinder to rotate, the constraint mechanism 11 comprises a stop lever matched with an irradiation sample tube 27, the small Y platform 9 is provided with an eddy current sensor 28 matched with the measuring mechanism 10, the eddy current sensor 28 is provided with a roller 19 matched with the irradiation sample tube 27, the detection system further comprises a third high-definition color CCD12 matched with the measuring mechanism 10 and a calibration ruler 26 arranged in parallel with the support, the calibration ruler 26 is installed on the main working platform 4, and the main working platform 4 is arranged above the support; the main working platform 4 is provided with a railing 2 and a transmission mechanism 5 matched with a main rack rail 6.

Example 2:

a method of testing a burnable poison assembly post-irradiation global performance inspection device as described in example 1, comprising the steps of:

1) mounting assembly 23: acquiring the levelness of the top plane of the support frame by thelevel gauge 24, wherein the levelness is required to be less than 0.5 degrees, pulling theassembly 23 out of the fuel assembly by using a burnable poison gripper of the nuclear power plant, moving the assembly to the top end of the support frame in the loading well, positioning the burnable poison gripper by two positioning holes of therotating mechanism 25, sitting above the rotatingmechanism 25, acquiring the levelness of the top plane of the support frame by thelevel gauge 24 again, wherein the levelness is required to be less than 0.5 degrees, inserting theassembly 23 into therotating mechanism 25 by an actuator on the burnable poison gripper, removing the burnable poison gripper, inserting the rotarylong handle 3 into the two positioning holes on therotating mechanism 25, and rotating theassembly 23 by 0-360 degrees; at the moment, the operators of the nuclear power plant can leave the control area, and the assembly parts are removed after the overall performance detection of the assembly parts is completed;

2) and detecting: the mountingassembly 23 is subjected to appearance inspection, irradiation growth amount measurement, and oxide film thickness measurement in this order; specifically, the method comprises the following steps:

the appearance inspection comprises the following steps:

A1) the main gantry electrical instrument system 1 drives the movingtrolley 18 to move on themain gantry rail 6 until the first high-definition color CCD20 moves to a position opposite to the upper end of theassembly part 23, the first high-definition color CCD20 is adopted for video recording, the automatic mode is adopted, and the main gantry electrical instrument system 1 drives the movingtrolley 18 again until the first high-definition color CCD20 moves to a position opposite to the lower end of theassembly part 23;

B1) rotating therotating mechanism 25 to inspect the other side surface of theassembly 23, thereby completing 4-surface appearance video recording of theassembly 23;

C1) amplifying and analyzing the video;

the measuring steps of the irradiation growth amount are as follows:

A2) moving theY platform 16 through the main stand electrometer system 1, moving the second high-definition color CCD14 to the rear end, and adjusting the light source to make the scales of thecalibration scale 26 and theirradiation sample tube 27 clearly visible;

B2) theX platform 15 is moved through the main stand electrometer system 1, and the stay wire scale is calibrated by matching with acalibration scale 26;

C2) moving theZ platform 8 through the main stand electrometer system 1, moving the second high-definition color CCD14 to the upper scale of theirradiation sample tube 27, enabling the upper scale to be positioned in the middle of the screen, and recording the value of the pull wire scale at the moment;

D2) moving theZ platform 8 through the main stand electrometer system 1, moving the second high-definition color CCD14 to the lower scale of theirradiation sample tube 27, enabling the lower scale to be positioned in the middle of the screen, and recording the value of the pull wire scale at the moment;

E2) converting the distance between the upper scale and the lower scale by the calibration value in the step B2, wherein the value is the distance between the two scales after irradiation;

F2) taking the difference between the value in the step E2 and the standard value as the irradiation growth amount;

J2) rotating therotating mechanism 25, and repeating the steps C2 to F2 to complete the irradiation growth measurement of theirradiation sample tube 27 in the remainingassembly 23;

the oxide film thickness measurement steps were:

A3) moving theX platform 15 through the main stand electrometer system 1, positioning the calibration rod in the middle of theroller 19 by means of theanti-radiation camera 13, moving theY platform 16, and enabling theroller 19 to be in contact with the calibration rod until the measuring probe of themeasuring mechanism 10 and theroller 19 are tightly attached to the calibration rod, and calibrating the oxidation film sensor;

B3) moving theY platform 16 through the detection electrical instrument system 7, wherein theY platform 16 drives themeasuring mechanism 10 and therestriction mechanism 11 to be inserted into the gap between the adjacentirradiation sample tubes 27, as shown in b in FIG. 4;

C3) through a proximity switch and observation by matching with a third high-definition color CCD12, whether theconstraint mechanism 11 is in place or not is judged;

D3) starting the air cylinder on theconstraint mechanism 11, rotating theconstraint mechanism 11 by 90 degrees, and enabling the shift lever on theconstraint mechanism 11 to be located behind theirradiation sample tube 27 to be measured; as in c of fig. 4;

E3) moving thesmall Y platform 9, and further driving themeasuring mechanism 10 to move forward, so that the measuring probe and theroller 19 of themeasuring mechanism 10 are tightly attached to theirradiation sample tube 27 to be measured, as shown in d in FIG. 4;

F3) moving theZ platform 8 through the main stage frame electrometer system 1 to measure the thickness of the oxide film;

J3) rotating therotating mechanism 25, and repeating steps B3 through F3 completes the oxide film thickness measurement of theirradiation sample tube 27 in the remainingassembly 23.

Fig. 4 a is a centering diagram of themeasuring mechanism 10 before measurement, fig. 4 b is a diagram of themeasuring mechanism 10 penetrating through the gap of theirradiation sample tube 27 to be measured, fig. 4 c is a diagram of the stopper rod on the constrainingmechanism 11 positioned behind theirradiation sample tube 27 to be measured, fig. 4 d is a diagram of the measurement process, fig. 4 e is a diagram of the constrainingmechanism 11 after measurement is finished, and fig. 4 f is a diagram of themeasuring mechanism 10 after measurement is finished and exits theirradiation sample tube 27 to be measured.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. The device for checking the overall performance of the burnable poison assembly after irradiation is characterized by comprising a support, a detection system and a main rack rail (6), wherein a rotating mechanism (25) is arranged at the top of the support, the rotating mechanism (25) is used for fixing an assembly part (23), the main rack rail (6) is arranged in parallel with the support, a moving trolley (18) is arranged on the main rack rail (6), the moving trolley (18) is controlled and driven by a main rack electrical instrument system (1), a first high-definition color CCD (20) is arranged on the moving trolley (18), the detection system comprises a quick connecting mechanism (17), an X platform (15), a Y platform (16) and a Z platform (8) are sequentially arranged on the quick connecting mechanism (17) from bottom to top, and the X platform (15) and the Y platform (16) are controlled by the main rack electrical instrument system (1) in the X-axis direction, Y axle direction removes, Z platform (8) are removed at Z axle direction by detection electric instrument system (7) control, detecting system still includes the measuring stick with Z platform (8) parallel arrangement, be provided with second high definition colour CCD (14) and radioresistance camera (13) on the measuring stick, be provided with little Y platform (9) on Z platform (8), be provided with measuring mechanism (10) on little Y platform (9), the tip of measuring mechanism (10) is rotated and is provided with restraint mechanism (11), restraint mechanism (11) include with irradiation appearance pipe (27) complex shelves pole, be provided with on little Y platform (9) with measuring mechanism (10) complex eddy current sensor (28), be provided with on eddy current sensor (28) with irradiation appearance pipe (27) complex gyro wheel (19), detecting system still includes with measuring mechanism (10) complex third high definition colour CCD (12), A calibration ruler (26) arranged parallel to the support.

2. The burnable poison assembly post-irradiation overall performance inspection device of claim 1, wherein the support comprises a lower base (21), the lower base (21) is installed at the bottom of the well, an upper base (22) is vertically arranged on the lower base (21), and the rotating mechanism (25) is arranged on the top of the upper base (22).

3. The burnable poison assembly post-irradiation integrity inspection device according to claim 1, wherein the rotation mechanism (25) is provided with a rotation long handle (3), and the rotation mechanism (25) is provided with a positioning hole engaged with the rotation long handle (3).

4. The burnable poison assembly post-irradiation overall performance inspection device of claim 1, wherein the restraint mechanism (11) is driven to rotate by a cylinder.

5. The burnable poison assembly post-irradiation integrity performance inspection device of claim 1, wherein the calibration ruler (26) is mounted on the main work platform (4), the main work platform (4) being disposed above the support.

6. The burnable poison assembly post-irradiation overall performance inspection device of claim 5, wherein the main working platform (4) is provided with a rail (2) and a transmission mechanism (5) engaged with the main rack rail (6).

7. The burnable poison assembly post-irradiation overall performance inspection device of claim 1, wherein the top of the rack is provided with a level gauge (24).

8. A method of testing the burnable poison assembly integral performance inspection device after irradiation according to any of claims 1-7, comprising the steps of:

1) and a mounting assembly (23): inserting the mounting assembly (23) into the rotating mechanism (25);

2) and detecting: the mounting assembly (23) was subjected to appearance inspection, irradiation growth amount measurement, and oxide film thickness measurement in this order.

9. The method of testing a burnable poison assembly post-irradiation global performance inspection device of claim 8, wherein the levelness measurement is taken of the top of the rack while the assembly (23) is installed, ensuring that the levelness is less than 0.5 °.

10. The method of inspecting a post-exposure global performance inspection device of a burnable poison assembly as recited in claim 8, wherein the step of visually inspecting is:

A1) the main rack electrical instrument system (1) drives the moving trolley (18) to move on the main rack rail (6) until the first high-definition color CCD (20) moves to a position opposite to the upper end of the assembly part (23), the first high-definition color CCD (20) is used for recording video, the main rack electrical instrument system (1) drives the moving trolley (18) again in an automatic mode until the first high-definition color CCD (20) moves to a position opposite to the lower end of the assembly part (23);

B1) a rotating mechanism (25) for inspecting the other side surface of the assembly (23) to complete 4-surface appearance video recording of the assembly (23);

C1) amplifying and analyzing the video;

the measuring steps of the irradiation growth amount are as follows:

A2) moving a Y platform (16) through a main stand electrical instrument system (1), moving a second high-definition color CCD (14) to the rear end, and adjusting a light source to enable scales of a calibration ruler (26) and an irradiation sample tube (27) to be clearly visible;

B2) the X platform (15) is moved through the main rack electrical instrument system (1), and the stay wire scale is calibrated by matching with the calibration scale (26);

C2) moving a Z platform (8) through a main rack electrical instrument system (1), moving a second high-definition color CCD (14) to an upper scale of an irradiation sample tube (27), enabling the upper scale to be located in the middle of a screen, and recording a pull wire scale value at the moment;

D2) moving a Z platform (8) through a main rack electrical instrument system (1), moving a second high-definition color CCD (14) to the lower scale of an irradiation sample tube (27), enabling the lower scale to be located in the middle of the screen, and recording the value of a pull wire scale at the moment;

E2) converting the distance between the upper scale and the lower scale by the calibration value in the step B2), wherein the value is the distance between the two scales after irradiation;

F2) taking the difference between the value in the step E2) and the standard value as the irradiation growth amount;

J2) rotating the rotating mechanism (25), and repeating the steps C2) to F2) to complete the irradiation growth measurement of the irradiation sample tube (27) in the rest assembly (23);

the oxide film thickness measurement steps were:

A3) moving an X platform (15) through a main platform electrical instrument system (1), enabling a calibration rod to be located in the middle of a roller (19) by means of an anti-radiation camera (13), moving a Y platform (16), enabling the roller (19) to be in contact with the calibration rod until a measuring probe of a measuring mechanism (10) and the roller (19) are tightly attached to the calibration rod, and calibrating an oxide film sensor;

B3) the Y platform (16) is moved through the detection electrical instrument system (7), and the Y platform (16) drives the measuring mechanism (10) and the restraining mechanism (11) to be inserted into a gap between adjacent irradiation sample tubes (27);

C3) through a proximity switch and in cooperation with the observation of a third high-definition color CCD (12), whether the constraint mechanism (11) is in place or not is judged;

D3) starting an air cylinder on the constraint mechanism (11), rotating the constraint mechanism (11) by 90 degrees, and enabling a shift lever on the constraint mechanism (11) to be located behind the irradiation sample tube (27) to be tested;

E3) the small Y platform (9) is moved to further drive the measuring mechanism (10) to move forward, so that a measuring probe and a roller (19) of the measuring mechanism (10) are tightly attached to the irradiation sample tube (27) to be measured;

F3) moving the Z platform (8) through the main platform electrical instrument system (1) to measure the thickness of the oxide film;

J3) rotating the rotating mechanism (25), and repeating the steps B3) to F3) to complete the measurement of the thickness of the oxide film of the irradiation sample tube (27) in the remaining assembly (23).

Images