CN219202772U

CN219202772U - Video inspection device suitable for inside inspection of nuclear fuel assembly

Info

Publication number: CN219202772U
Application number: CN202223360956.1U
Authority: CN
Inventors: 周国正; 梁军; 姜大超; 唐西明; 许小兵; 昌思怡; 曾凯亮; 周淞仪
Original assignee: China General Nuclear Power Corp; CGN Power Co Ltd; Lingao Nuclear Power Co Ltd; Suzhou Nuclear Power Research Institute Co Ltd
Current assignee: China General Nuclear Power Corp; CGN Power Co Ltd; Lingao Nuclear Power Co Ltd; Suzhou Nuclear Power Research Institute Co Ltd
Priority date: 2022-12-14
Filing date: 2022-12-14
Publication date: 2023-06-16
Anticipated expiration: 2032-12-14

Abstract

The utility model discloses a video inspection device suitable for inspecting the inside of a nuclear fuel assembly, which comprises an optical fiber, a light source module, a relay camera module, a power module and a control module, wherein one end of the optical fiber is a detection end used for penetrating into the inside of the nuclear fuel assembly for detection, and the other end of the optical fiber is a connection end used for being connected with the light source module or the relay camera module; the optical fiber comprises a beam optical fiber for illumination and an image beam optical fiber for feedback image propagation, and the detection ends of the beam optical fiber and the image beam optical fiber are positioned on the same plane. The video inspection device suitable for inspecting the interior of the nuclear fuel assembly utilizes the characteristics of fineness and softness of the optical fiber, and simultaneously the axial leads of the detection ends of the beam optical fiber and the image beam optical fiber are positioned on the same plane, so that the device can penetrate into the fuel rod in the interior of the fuel assembly for inspecting, has better performance and flexibility, improves the inspection safety and reduces the cost.

Description

Video inspection device suitable for inside inspection of nuclear fuel assembly

Technical Field

The utility model belongs to the technical field of nuclear power detection, and particularly relates to a video inspection device suitable for internal inspection of a nuclear fuel assembly.

Background

The fuel assembly serves as a core working element of a nuclear power plant, which generates heat through a nuclear reaction for power generation or other uses. After a certain period of use, the fuel assembly may be damaged due to fission nuclear reactions in high temperature, high pressure, and water flow environments.

It is necessary to inspect the fuel assembly. However, the current video inspection means can only meet the inspection of 2-3 layers of fuel rods at the periphery of the assembly, and the fuel rods at the inner layer cannot be comprehensively inspected due to the problems of angles and light rays.

Disclosure of Invention

In view of the above, in order to overcome the defects of the prior art, the present utility model aims to provide a video inspection device for inspecting the inside of a nuclear fuel assembly, which is suitable for the medium voltage of a nuclear power plant, and can go deep into the inside of the nuclear fuel assembly for inspection.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the video inspection device suitable for the internal inspection of the nuclear fuel assembly comprises an optical fiber, a light source module, a relay camera module, a power supply module and a control module, wherein one end of the optical fiber is a detection end which is used for penetrating into the nuclear fuel assembly, and the other end of the optical fiber is a connection end which is used for being connected with the light source module or the relay camera module; the optical fiber comprises a beam optical fiber for illumination and an image beam optical fiber for feedback image propagation, and the axes of the detection ends of the beam optical fiber and the image beam optical fiber are positioned on the same plane.

According to some preferred embodiments of the present utility model, the relay camera module comprises a light source module, a relay camera module, and a power module, wherein the light source module, the relay camera module and the power module are arranged in the housing, and the power module is connected with the light source module and the relay camera module for supplying power.

According to some preferred embodiments of the present utility model, the housing is provided with a first socket and a second socket, the connection end of the image beam optical fiber is connected to the first socket, the relay camera module is disposed corresponding to the first socket, the connection end of the light beam optical fiber is connected to the second socket, and the light source module is disposed corresponding to the second socket.

According to some preferred embodiments of the utility model, the beam-like optical fiber has a first plug on its connection end for insertion into the first receptacle; and a second plug is arranged on the connecting end of the beam optical fiber and is used for being inserted into the second socket. The optical fiber is connected with the light source module or the relay camera module in a convenient pluggable connection mode, so that the optical fiber can be quickly connected or detached, and the optical fiber is convenient to replace.

According to some preferred embodiments of the present utility model, a portion of the optical fiber near the detection end is an execution section, a portion of the optical fiber near the connection end is a hose section, a steel pipe is sleeved on the periphery of the optical fiber of the execution section, and a clamping handle is arranged between the execution section and the hose section and is used for being clamped on a mechanical scanning device. The optical fiber scanning device is assembled on the mechanical scanning device through the clamping handle, and the mechanical scanning device drives the execution section of the optical fiber to move and go deep into the nuclear fuel assembly for inspection.

According to some preferred embodiments of the utility model, the beam fiber and the steel tube outside the beam fiber are fixed together.

According to some preferred embodiments of the utility model, the hose of the hose section has a polyurethane coating with radiation protection properties.

According to some preferred embodiments of the utility model, the optical fiber comprises an image beam optical fiber and two beam optical fibers, wherein two beam optical fibers are positioned at two sides of the image beam optical fiber, and the execution sections of the three optical fibers are positioned on the same plane, namely the axes of the three optical fibers are positioned on the same plane. This arrangement allows the actuating end of the optical fiber to be flattened and extend further into the interior of the nuclear fuel assembly.

According to some preferred embodiments of the utility model, the optical fiber is a silica optical fiber.

According to some preferred embodiments of the utility model, an electrical interface is provided on the housing, the electrical interface being connected to the control module.

Due to the adoption of the technical scheme, compared with the prior art, the utility model has the following advantages: the video inspection device suitable for inspecting the interior of the nuclear fuel assembly utilizes the characteristics of fineness and softness of the optical fiber, and simultaneously sets the axes of the detection ends of the beam optical fiber and the image beam optical fiber on the same plane, so that the device can penetrate into a fuel rod in the interior of the fuel assembly for inspecting, has better performance and flexibility, improves the inspection safety and reduces the cost.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view showing the construction of a video inspection apparatus suitable for the internal inspection of a nuclear fuel assembly according to a preferred embodiment of the present utility model;

FIG. 2 is an enlarged view of section I of FIG. 1;

FIG. 3 is a schematic cross-sectional view of an optical fiber executing section in accordance with a preferred embodiment of the present utility model;

in the drawing, a video inspection device-1, a shell-2, a light source module-3, a relay camera module-4, a power source module-5, a beam optical fiber-6, an image beam optical fiber-7, a first socket-81, a second socket-82, a first plug-91, a second plug-92, a fastener-10, a sealing ring-11, an execution section-12, a hose section-13, a steel pipe-14, a clamping handle-15, an electric interface-16, a tee joint-17 and a lens-18.

Detailed Description

In order to make the technical solution of the present utility model better understood by those skilled in the art, the technical solution of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

As shown in fig. 1 to 3, the video inspection device 1 suitable for the inspection of the interior of a nuclear fuel assembly in this embodiment includes an optical fiber, a control module, a housing 2, and a light source module 3, a relay camera module 4 and a power source module 5 which are accommodated in the housing 2, and an electrical interface 16 is provided on the housing 2, and the electrical interface 16 is connected with the control module. The light source module 3 is used for providing light for illumination, the relay camera module 4 receives image information, converts signals and transmits the converted signals back to the control module, and the power supply module 5 is connected with the light source module 3 and the relay camera module 4 for supplying power to the light source module and the relay camera module 4.

The optical fiber can transmit light rays by utilizing the principle of total reflection of light, can also receive image information and transmits the image information back to the relay module. The optical fiber for the illumination 6 and the image beam optical fiber for the feedback image propagation 7 are included in the present embodiment, one end of the optical fiber is a detection end for penetrating into the nuclear fuel assembly for detection, and the other end is a connection end for connection with the light source module 3 or the relay camera module 4. The part of the optical fiber close to the detection end is an execution section 12, the part close to the connection end is a hose section 13, a steel pipe 14 is sleeved on the periphery of the optical fiber of the execution section 12, and a radiation-proof polyurethane coating is arranged on the hose of the hose section 13. The steel tube 14 can keep certain levelness and rigidity, and the optical fiber can be conveniently pushed to extend into the fuel rod through the gap of the fuel rod for detection.

Since the beam optical fiber 6 is connected with the illumination module, and the image beam optical fiber 7 is connected with the relay camera module 4, the tee joint 17 is arranged on the hose section 13 in the embodiment, the image beam optical fiber 7 and the beam optical fiber 6 are gathered into a strand, and the optical fiber is wrapped for protection.

A clamping handle 15 is arranged between the execution section 12 and the hose section 13, the clamping handle 15 is used for clamping to a mechanical scanning device, and the mechanical scanning device drives the execution section 12 of the optical fiber to move and go deep into the nuclear fuel assembly for inspection. The optical fiber in the embodiment is a quartz optical fiber, and the irradiation-resistant dose rate of the optical fiber can reach 10 ⁶ Gy。

The axes of the detection ends of the beam optical fiber 6 and the image beam optical fiber 7 are positioned on the same plane. In this embodiment, the optical fiber includes an image beam optical fiber 7 and two beam optical fibers 6, the two beam optical fibers 6 are located at two sides of the image beam optical fiber 7, and the beam optical fiber 6 and a steel tube 14 outside the image beam optical fiber 7 are fixed together. And the axes of the actuating segments 12 of the three optical fibers lie on the same plane. This arrangement allows the actuating end of the optical fiber to be flattened and extend further into the interior of the nuclear fuel assembly.

The front end of the optical fiber is provided with an objective lens 18 for collecting an object image and/or focusing. The object image is transmitted to the relay camera module 4 through the image beam optical fiber 7, and the relay camera module 4 can perform signal conversion and transmit the processed signal back to the control module.

The housing 2 in this embodiment is provided with a first socket 81 and a second socket 82, and the connection end of the optical fiber 7 is connected to the first socket 81, and the connection end of the optical fiber 6 is connected to the second socket 82. Specifically, the connection end of the image beam optical fiber 7 is provided with a first plug 91, and the first plug 91 is used for being inserted into the first socket 81, and the relay camera module is arranged corresponding to the first socket; the connection end of the beam fiber 6 is provided with a second plug 92, the second plug 92 is used for being plugged into the second socket 82, and the light source module is arranged corresponding to the second socket. The light rays and the light source module 3 or the relay camera module 4 are connected in a convenient pluggable mode, so that the light rays can be quickly connected or detached, and the relay camera module is convenient to replace. In this embodiment, the socket is further provided with a fastener 10 and a sealing ring 11, the fastener 10 is in threaded connection with the socket, the sealing ring 11 is located between the fastener 10 and the socket, and after the plug is inserted into the socket, the fastener 10 is screwed down to achieve sealing.

The video inspection device 1 in the embodiment connects the optical fiber to the mechanical scanning device of the fuel assembly through the clamping handle 15, and is driven by the mechanical scanning device of the fuel assembly to move forward to the inside of the fuel assembly for visual inspection. The beam optical fiber 6 realizes illumination, the image beam optical fiber 7 receives the image, the image is transmitted back to the relay camera module 4, and the relay camera module 4 converts the transmitted image into a digital signal and transmits the digital signal to the control module for display or processing.

The existing video inspection means can only meet the inspection of 2-3 layers of rods at the periphery of the fuel assembly, and the fuel rods at the inner layer cannot be comprehensively inspected due to the problems of angles and light rays. The fuel assembly fiberscope inspection apparatus of the present utility model uses a front objective to image an object image on the end face of the image beam fiber 7. The image beam optical fiber 7 can transmit image information, the light beam optical fiber 6 provides light illumination, the relay camera module 4 receives the image information, performs signal conversion and transmits the signal converted by the image information back to the control module, and the power module 5 is used for providing power for other modules, so that the problem that the fuel rod at the inner side of the fuel assembly cannot perform video inspection at the present stage is solved.

The above embodiments are provided to illustrate the technical concept and features of the present utility model and are intended to enable those skilled in the art to understand the content of the present utility model and implement the same, and are not intended to limit the scope of the present utility model. All equivalent changes or modifications made in accordance with the spirit of the present utility model should be construed to be included in the scope of the present utility model.

Claims

1. The video inspection device is characterized by comprising an optical fiber, a light source module, a relay camera module, a power module and a control module, wherein one end of the optical fiber is a detection end which is used for penetrating into the nuclear fuel assembly, and the other end of the optical fiber is a connection end which is used for being connected with the light source module or the relay camera module; the optical fiber comprises a beam optical fiber for illumination and an image beam optical fiber for feedback image propagation, and the axes of the detection ends of the beam optical fiber and the image beam optical fiber are positioned on the same plane.

2. The video inspection device of claim 1, comprising a housing, wherein the light source module, the relay camera module, and the power module are disposed within the housing, wherein the power module is coupled to the light source module and the relay camera module for providing power.

3. The video inspection device according to claim 2, wherein a first socket and a second socket are provided on the housing, the connection end of the image beam fiber is connected to the first socket, the relay camera module is provided corresponding to the first socket, the connection end of the light beam fiber is connected to the second socket, and the light source module is provided corresponding to the second socket.

4. A video inspection device according to claim 3, wherein the beam-like optical fiber has a first plug on its connection end for insertion into the first receptacle; and a second plug is arranged on the connecting end of the beam optical fiber and is used for being inserted into the second socket.

5. The video inspection device according to claim 1, wherein a portion of the optical fiber near the detection end is an execution section, a portion near the connection end is a hose section, a steel pipe is sleeved on the periphery of the optical fiber of the execution section, and a clamping handle is arranged between the execution section and the hose section and used for being clamped on the mechanical scanning device.

6. The video inspection device of claim 5, wherein the beam fiber and the steel tube outside the beam fiber are secured together.

7. The video inspection device of claim 5 wherein the hose of the hose section has a radiation-resistant polyurethane coating thereon.

8. The video inspection device of claim 1, comprising one image beam fiber and two beam fibers, two of the beam fibers being located on either side of the image beam fiber, and the execution segments of the three fibers being located on the same plane.

9. The video inspection device of claim 1, wherein the optical fiber is a quartz optical fiber.

10. The video inspection device of claim 2, wherein an electrical interface is provided on the housing, the electrical interface being connected to the control module.