Nondestructive testing equipment for reactor pressure vessel head and positioning method and testing method

Abstract

The application discloses a reactor pressure vessel top cover nondestructive testing equipment and a positioning method and a testing method. The testing equipment comprises a testing driving part, a positioning part and the like. The testing driving part comprises a flexible chain mounting plate, an adjustable angle flexible chain mounted on the flexible chain mounting plate, and a probe assembly mounted on the flexible chain. The flexible chain moves in a first direction on a second plane parallel to a first plane. The probe assembly moves in a second direction perpendicular to the first direction on the second plane. The positioning part comprises a positioning mounting plate, a laser emitter and a camera mounted on the positioning mounting plate. The laser emitted by the laser emitter is perpendicular to the first direction. Through the perpendicular arrangement of the laser emitter and the movement direction of the flexible chain, the position calibration of the probe in the first direction and the second direction can be quickly realized, and the implementation is simple and effective. The accurate positioning of the testing equipment under the complex curved surface environment of the top cover surface can be realized.

Description

Technical Field

[0001] This invention belongs to the field of nuclear power testing equipment, and specifically relates to a non-destructive testing device for the top cover of a reactor pressure vessel, as well as a positioning method and a testing method. Background Technology

[0002] The reactor pressure vessel top cover of a nuclear power plant is the core equipment of the nuclear reactor. The main body is welded together from the top cover flange and the top cover head. Several CRDM penetrations and reactor test pipe penetrations are installed on the top cover head through corresponding holes.

[0003] To ensure the safe operation of nuclear power plants, regular surface and volumetric non-destructive testing of the head material is required. Because the head is spherical, and further obstructed by CRDM (Crew Container Drilling) and reactor expansion joint (CBD) penetrations, multiple strip-shaped inspection areas are formed. The surface shapes of different strip-shaped areas vary, and even within the same strip-shaped area, different locations exhibit different surface shapes. Since the inspection results must be repeatable and traceable, determining the correspondence between the equipment coordinate system and the top cover coordinate system presents a significant challenge to precise equipment positioning. Summary of the Invention

[0004] The purpose of this invention is to provide a non-destructive testing device for the top cover of a reactor pressure vessel, which can unify the correspondence between the equipment coordinate system and the top cover coordinates, making the inspection more accurate.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a non-destructive testing device for the top cover of a reactor pressure vessel, wherein the upper end face of the top cover flange is a first plane, and it includes:

[0006] The detection drive unit includes a flexible chain mounting plate, an adjustable-angle flexible chain mounted on the flexible chain mounting plate, and a probe assembly mounted on the flexible chain. The flexible chain moves along a first direction on a second plane parallel to the first plane, and the probe assembly moves along a second direction perpendicular to the first direction on the second plane.

[0007] The positioning unit includes a positioning mounting plate, a laser emitter and a camera mounted on the positioning mounting plate, wherein the laser emitted by the laser emitter is perpendicular to the first direction.

[0008] In another embodiment, the flexible chain is a unidirectionally coiled metal plate, and the detection drive unit includes a chain disc for winding the flexible chain, an adjustable mounting base mounted on the flexible chain mounting plate, and a motor mounted on the mounting base for driving the chain disc to rotate, wherein the chain disc is rotatably connected to the mounting base.

[0009] The present invention also provides a positioning method for a non-destructive testing device for a reactor pressure vessel top cover, wherein the projection of the through-holes on the top cover onto a first plane can be divided into multiple groups along a first direction and also into multiple groups along a second direction. A first channel is formed between two adjacent groups of through-holes distributed along the first direction, and a second channel is formed between two adjacent groups of through-holes distributed along the second direction. The method includes the following steps:

[0010] a. Fix the flexible chain mounting plate to the top cover flange;

[0011] b. Install the flexible chain onto the flexible chain mounting plate and arrange the flexible chain along the first channel;

[0012] c. Fix the positioning mounting plate to the top cover flange, install the laser emitter and camera on the positioning mounting plate, make the laser emitter emit laser in the second direction, turn on the camera, start the flexible chain, and drive the probe forward;

[0013] d. Observe the positional relationship between the laser line and the corresponding marked point on the probe through the camera until the two coincide, which completes the position calibration in the first direction;

[0014] e. Then drive the probe to move in a direction perpendicular to the channel to complete the position calibration in the second direction;

[0015] f. Repeat step ae to complete all position calibrations.

[0016] The present invention also provides a testing method for a non-destructive testing device for the top cover of a reactor pressure vessel, which includes the following steps:

[0017] A. Fix the flexible chain mounting plate to the top cover flange;

[0018] B. Install the flexible chain onto the flexible chain mounting plate and arrange the flexible chain along the first channel;

[0019] C. Fix the positioning mounting plate to the top cover flange, install the laser emitter and camera on the positioning mounting plate, make the laser emitter emit laser in the second direction, turn on the camera, start the flexible chain, and drive the probe forward;

[0020] D. Observe the positional relationship between the laser line and the corresponding marked point on the probe through the camera until the two coincide, which completes the position calibration in the first direction;

[0021] E. Then drive the probe to move in a direction perpendicular to the channel to complete the position calibration in the second direction;

[0022] F. When performing non-destructive testing, the probe can be fully scanned and covered by the second channel by moving the probe along the direction of the first channel.

[0023] G. Change to another channel and repeat step AG to complete the non-destructive testing of the surface and volume of the top cover head.

[0024] The beneficial effects of this invention are as follows: by setting the laser emitter perpendicular to the direction of movement of the flexible chain, the position calibration of the probe in the first and second directions can be quickly achieved, which is simple and effective; and it can achieve precise positioning of the detection equipment in complex curved surface environments of the top cover. Attached Figure Description

[0025] Figure 1 This is a top view of the present invention;

[0026] Figure 2 This is an installation diagram of the present invention. Detailed Implementation

[0027] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings:

[0028] like Figure 1-2 As shown, the top cover includes a top cover flange 1, a top cover head 2, and a through-piece 4. The top cover flange 1 has bolt holes 11. The upper end face of the top cover flange 1 is a first plane Z. The projection of the through-piece 4 on the first plane Z can be divided into multiple groups along a first direction X and also into multiple groups along a second direction Y. Adjacent groups of through-pieces distributed along the first direction X form a first channel Q, and adjacent groups of through-pieces distributed along the second direction Y form a second channel P. The non-destructive testing equipment for the reactor pressure vessel top cover includes a testing drive unit and a positioning unit.

[0029] The detection drive unit includes a flexible chain mounting plate 5, an adjustable-angle flexible chain 6 mounted on the flexible chain mounting plate 5, a probe 7 assembly mounted on the flexible chain 6, a chain disc 12 for winding the flexible chain 6, an adjustable-angle mounting base 13 mounted on the flexible chain mounting plate 5, and a motor 14 mounted on the mounting base 13 for driving the chain disc 12 to rotate. The chain disc 12 is rotatably connected to the mounting base 13. The flexible chain 6 moves along a first direction X on a second plane parallel to the first plane Z. The probe 7 assembly can be driven by a lead screw assembly (the lead screw assembly is prior art and not the focus of this invention, so it will not be described in detail here) to move along a second direction Y perpendicular to the first direction X on the second plane. The flexible chain 6 is a unidirectionally coiled metal plate. When the motor 14 drives the chain disc 12 to release the flexible chain 6, the flexible chain 6 extends forward along the first direction and cannot be bent downwards, similar to the principle of a measuring tape.

[0030] The positioning unit includes a positioning mounting plate 9, a laser emitter 10 mounted on the positioning mounting plate 9, and a camera 3. The laser 8 emitted by the laser emitter 10 is perpendicular to the first direction X.

[0031] The positioning method for the above-mentioned non-destructive testing equipment for reactor pressure vessel top cover includes the following steps:

[0032] a. Fix the flexible chain mounting plate 5 onto the top cover flange 1;

[0033] b. Install the flexible chain 6 onto the flexible chain mounting plate 5, and arrange the flexible chain 6 along the first channel Q;

[0034] c. Fix the positioning mounting plate 9 to the top cover flange 1, install the laser emitter 10 and camera 3 on the positioning mounting plate 9, so that the laser 8 of the laser emitter 10 is emitted along the second direction Y, turn on the camera 3, start the flexible chain 6, and drive the probe 7 forward.

[0035] d. Observe the positional relationship between the laser line 8 and the corresponding marked point on the probe 7 through the camera 3 until the two coincide, thus completing the position calibration in the first direction X;

[0036] e. Then drive probe 7 to move in a direction perpendicular to the channel to complete the position calibration in the second direction Y;

[0037] f. Repeat step ae to complete all position calibrations.

[0038] The detection method based on the above positioning method includes the following steps:

[0039] A. Fix the flexible chain mounting plate 5 onto the top cover flange 1;

[0040] B. Install the flexible chain 6 onto the flexible chain mounting plate 5, and arrange the flexible chain 6 along the first channel Q;

[0041] C. Fix the positioning mounting plate 9 to the top cover flange 1, install the laser emitter 10 and camera 3 on the positioning mounting plate 9, so that the laser 8 of the laser emitter 10 is emitted along the second direction Y, turn on the camera 3, start the flexible chain 6, and drive the probe 7 forward.

[0042] D. Observe the positional relationship between the laser line 8 and the corresponding marked point on the probe 7 through the camera 3 until the two coincide, thus completing the position calibration in the first direction X;

[0043] E. Then drive probe 7 to move in a direction perpendicular to the channel to complete the position calibration in the second direction Y;

[0044] F. When performing non-destructive testing, the probe 7 can be fully scanned and covered by the probe 7 by moving along the second channel P direction and the first channel Q direction.

[0045] G. Change to another channel and repeat step AG to complete the non-destructive testing of the surface and volume of the top cover head 2.

[0046] By setting the laser emitter 10 perpendicular to the direction of movement of the flexible chain, the position calibration of the probe in the first direction X and the second direction Y can be quickly achieved. The method is simple and effective, and it can achieve precise positioning of the detection equipment in complex curved surface environments of the top cover.

[0047] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A positioning method based on a non-destructive testing device for the top cover of a reactor pressure vessel, wherein the upper end face of the top cover flange is a first plane, characterized in that, The non-destructive testing equipment for the reactor pressure vessel top cover includes: The detection drive unit includes a flexible chain mounting plate, an adjustable-angle flexible chain mounted on the flexible chain mounting plate, and a probe assembly mounted on the flexible chain. The flexible chain moves along a first direction on a second plane parallel to the first plane, and the probe assembly moves along a second direction perpendicular to the first direction on the second plane. The positioning unit includes a positioning mounting plate, a laser emitter and a camera mounted on the positioning mounting plate, wherein the laser emitted by the laser emitter is perpendicular to the first direction; the flexible chain is a unidirectionally coiled metal plate; the detection driving unit includes a chain disc for winding the flexible chain, an adjustable mounting base mounted on the flexible chain mounting plate, and a motor mounted on the mounting base for driving the chain disc to rotate, wherein the chain disc is rotatably connected to the mounting base. The projection of the through-pieces on the top cover onto the first plane can be divided into multiple groups along a first direction and also into multiple groups along a second direction. A first channel is formed between two adjacent groups of through-pieces distributed along the first direction, and a second channel is formed between two adjacent groups of through-pieces distributed along the second direction. This includes the following steps: a. Fix the flexible chain mounting plate to the top cover flange; b. Install the flexible chain onto the flexible chain mounting plate and arrange the flexible chain along the first channel; c. Fix the positioning mounting plate to the top cover flange, install the laser emitter and camera on the positioning mounting plate, make the laser emitter emit laser in the second direction, turn on the camera, start the flexible chain, and drive the probe forward; d. Observe the positional relationship between the laser line and the corresponding marked point on the probe through the camera until the two coincide, which completes the position calibration in the first direction; e. Then drive the probe to move in a direction perpendicular to the channel to complete the position calibration in the second direction; f. Repeat step ae to complete all position calibrations.

2. A detection method based on the positioning method of claim 1, characterized in that: It includes the following steps: A. Fix the flexible chain mounting plate to the top cover flange; B. Install the flexible chain onto the flexible chain mounting plate and arrange the flexible chain along the first channel; C. Fix the positioning mounting plate to the top cover flange, install the laser emitter and camera on the positioning mounting plate, make the laser emitter emit laser in the second direction, turn on the camera, start the flexible chain, and drive the probe forward; D. Observe the positional relationship between the laser line and the corresponding marked point on the probe through the camera until the two coincide, which completes the position calibration in the first direction; E. Then drive the probe to move in a direction perpendicular to the channel to complete the position calibration in the second direction; F. When performing non-destructive testing, the probe can be fully scanned and covered by the second channel by moving the probe along the direction of the first channel. G. Change to another channel and repeat step AG to complete the non-destructive testing of the surface and volume of the top cover head.

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