Fishing device and method for foreign matters in nuclear power plant container

Abstract

The invention provides a fishing device and method for foreign matter in a nuclear power plant container. The fishing device for the foreign matter in the nuclear power plant container comprises a foreign matter fishing main guide rod, a first aluminum plastic pipe, a second aluminum plastic pipe, a first nylon rope, a push rod, a second nylon rope, a foreign matter hanging cage, a third nylon rope, a camera, an endoscope and a four-corner gripper. The first aluminum-plastic pipe is fixed to the foreign matter salvage main guide rod and used as a guide pipe of the endoscope, and the lower end of the first aluminum-plastic pipe is bent to ensure normal passing of the endoscope. And the second aluminum-plastic pipe and the first aluminum-plastic pipe are fixedly connected and are fixed on the foreign matter salvage main guide rod in parallel. And the lower end of the second aluminum-plastic pipe is bent to ensure normal passing of the four-corner gripper. One end of the first nylon rope is fixed to the bottom of the foreign matter salvage main guide rod. The two plastic-aluminum pipes are fixed to the foreign matter salvage main guide rod side by side, the lower ends of the two plastic-aluminum pipes are bent, and therefore the technical effect of guiding an endoscope and a grabbing tool is achieved.

Description

Technical Field

[0001] The present application belongs to the technical field of diesel generators for nuclear power plants, and specifically relates to a device and method for salvaging foreign objects in a container of a nuclear power plant. Background Art

[0002] When the 2RCP002VP valve body of the reactor coolant system of nuclear power units such as Fuqing Unit 2 was dismantled, it was found that the valve seat disc spring was broken and a small half circle (about 170°, 90mm length semi-arc) was missing. After checking the upstream and downstream pipelines of the 2RCP001 / 002VP valve and the regulator 2RCP001BA for foreign matter, it was confirmed that the missing disc spring of 2RCP002VP was located on the lower support plate of the regulator 2RCP001BA. The foreign matter was in the primary circuit and may cause damage to the fuel assembly and the primary circuit main equipment during operation. The foreign matter was located at the bottom of the regulator. Due to the limited internal space, the endoscope and gripper could not turn normally, which was extremely difficult and could not be salvaged by conventional methods. Summary of the invention

[0003] In view of this, the embodiments of the present application are committed to providing a foreign body salvage device and salvage method in a nuclear power plant container. By fixing two aluminum-plastic tubes in parallel on a foreign body salvage main guide rod and setting a bend at the lower ends of the two aluminum-plastic tubes, the problem of salvaging foreign bodies in nuclear power plant containers, small spaces and high-dose areas can be solved.

[0004] The first aspect of the present application provides a foreign body salvage device for a nuclear power plant container, which comprises: a foreign body salvage main guide rod, a first aluminum-plastic tube, a second aluminum-plastic tube, a first nylon rope, a push rod, a second nylon rope, a foreign body hanging cage, a third nylon rope, a camera, an endoscope and a four-corner gripper. The first aluminum-plastic tube is fixed on the foreign body salvage main guide rod, and the first aluminum-plastic tube is used as a guide tube for the endoscope. The lower end of the first aluminum-plastic tube is bent to ensure that the endoscope passes normally. The second aluminum-plastic tube is fixedly connected to the first aluminum-plastic tube and is fixed in parallel on the foreign body salvage main guide rod. The lower end of the second aluminum-plastic tube is bent to ensure that the four-corner grippers pass normally. One end of the first nylon rope is fixed to the bottom of the foreign body salvage main guide rod. The push rod is used to pull the middle part of the first nylon rope to the vertical position of the center of the container. The second nylon rope is used to pull the foreign body hanging cage. The third nylon rope is used to pull and adjust the position of the camera. The camera is used to provide lighting and monitoring inside the container. The endoscope is used to provide lighting and monitoring at the bottom of the container.

[0005] In a specific embodiment of the present application, the lower ends of the first aluminum-plastic tube and the second aluminum-plastic tube are both bent 155°.

[0006] In a specific embodiment of the present application, the main guide rod for salvaging foreign matter is assembled from multiple sections of guide rods, and two adjacent sections of the multiple sections of the guide rods are connected by pins.

[0007] The second aspect of the present application provides a method for salvaging foreign objects in a nuclear power plant container, which comprises: opening a manhole of a pressurizer, installing a flange and a guide rail of the pressurizer; tying a third nylon rope in a foreign object salvaging device in a nuclear power plant container of an embodiment of the present application to a camera; connecting a camera system and an endoscope inspection system, turning on a built-in light tube and monitoring screen after power is turned on; sending the camera to the central axis of the pressurizer through the guide rail; adjusting the pitch angle of the camera to face vertically downward, and sending the camera to a position about 300 mm above the central hole of the lower support plate of the electric heating element through the third nylon rope; adjusting the rotation and pitch of the camera, adjusting the camera angle, and confirming the position of foreign objects in the lower head area of ​​the pressurizer below the lower support plate of the electric heating element; monitoring the position of foreign objects throughout the process through the rotation angle of the camera and the endoscope monitoring screen; tying a first aluminum-plastic tube and a second aluminum-plastic tube to the central axis of the pressurizer; adjusting the rotation and pitch of the camera, and adjusting the camera angle; confirming the position of foreign objects in the lower head area of ​​the pressurizer below the lower support plate of the electric heating element; monitoring the position of foreign objects throughout the process through the rotation angle of the camera and the endoscope monitoring screen; tying a first aluminum-plastic tube and a second aluminum-plastic tube to the central axis of the pressurizer; adjusting the rotation and pitch of the camera, and adjusting the camera angle; The tubes are fixed in parallel at the ends of the main guide rods for foreign body salvage, and the lower ends of the first aluminum-plastic tube and the second aluminum-plastic tube are bent; the first nylon rope is fixed at the bottom end of the main guide rod for foreign body salvage; the endoscope and the four-corner grabbers are guided to the vicinity of the foreign body through the first aluminum-plastic tube and the second aluminum-plastic tube; the first nylon rope at the end of the main guide rod for foreign body salvage is tied to a fixed point or the operator's hand, and is sent into the interior through the manhole of the stabilizer, and slowly descends to the center hole of the support plate under the electric heating element, and then the main guide rod for foreign body salvage is controlled to make the four-corner grabber enter the lower area of ​​the lower support plate; the foreign body cage is placed at the bottom of the stabilizer with the second nylon rope; under the monitoring and positioning of the endoscope monitoring screen, the foreign body is grabbed with the four-corner grabber; after grabbing the foreign body, the main guide rod for foreign body salvage is slowly lifted up, and the foreign body is placed in the foreign body cage; the foreign body cage is slowly lifted up, the foreign body is taken out of the stabilizer, and the foreign body is placed in a high-pressure container prepared in advance.

[0008] In a specific embodiment of the present application, before or at the same time as the first aluminum-plastic tube and the second aluminum-plastic tube are fixed in parallel at the ends of the main guide rod for foreign body salvage and the lower ends of the first aluminum-plastic tube and the second aluminum-plastic tube are bent, the foreign body salvage method in the nuclear power plant container further includes: if the main guide rod for foreign body salvage is assembled from multiple guide rods, insert the connecting head of the guide rod into one end of the pipe mouth of another guide rod, align the connecting holes, insert a quick lock pin, and ensure that the connection is firm. Repeat the operation until the main guide rod for foreign body salvage reaches the target length.

[0009] The beneficial effect of the technical solution of the present application is that by fixing two aluminum-plastic tubes (i.e., the first aluminum-plastic tube and the second aluminum-plastic tube) in parallel on the main guide rod for foreign body salvage and setting the lower ends of the two aluminum-plastic tubes to bend, the endoscope and the four-corner grippers are respectively guided to the vicinity of the foreign body through the two aluminum-plastic tubes, thereby achieving the technical effect of guiding the endoscope and the grasping tool, which is conducive to the accurate grasping of foreign bodies. In addition. By fixing one end of the first nylon rope at the bottom of the main guide rod for foreign body salvage, pushing the first nylon rope with a push rod, and using the first nylon rope for traction and position adjustment, the technical effect of moving the tool from the lateral position to the center position of the container and adjusting the position is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 Shown is a schematic diagram of the location of foreign matter in a nuclear power plant pressure vessel provided by an embodiment of the present application.

[0011] Figure 2 The figure shows a schematic structural diagram corresponding to a foreign body salvaging device in a nuclear power plant container provided by one embodiment of the present application when salvaging foreign body.

[0012] Figure 3 Shown is a schematic flow chart of a method for salvaging foreign matter in a nuclear power plant container provided in one embodiment of the present application.

[0013] Figure 4 Shown is a schematic flow chart of a method for salvaging foreign matter in a nuclear power plant container provided in another embodiment of the present application. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0015] For example, refer to Figure 1 The nuclear power plant pressure vessel includes a lower support plate 1a, an electric heating element 1b and a surge pipe nozzle 1c. Figure 1 At the position shown, the use of a nuclear power plant container foreign body salvaging device to salvage foreign bodies in a pressure vessel is used as an example to illustrate.

[0016] At least one embodiment of the present application provides a foreign body salvage device in a nuclear power plant container, referring to Figure 2The foreign body salvage device in the nuclear power plant container includes a foreign body salvage main guide rod 1, a first aluminum-plastic tube 2, a second aluminum-plastic tube 3, a first nylon rope 4, a push rod 5, a second nylon rope 6, a foreign body hanging cage 7, a third nylon rope 8, a camera 9, an endoscope 10 and a four-corner gripper 11. The first aluminum-plastic tube 2 is fixed on the foreign body salvage main guide rod 1, and the first aluminum-plastic tube 2 is used as an endoscope guide tube. The lower end of the first aluminum-plastic tube 2 is bent to ensure that the endoscope passes normally. The second aluminum-plastic tube 3 is fixedly connected to the first aluminum-plastic tube 2 and is fixed in parallel on the foreign body salvage main guide rod 1. The lower end of the second aluminum-plastic tube 3 is bent to ensure that the four-corner gripper 11 passes normally. One end of the first nylon rope 4 is fixed at the bottom of the foreign body salvage main guide rod 1. The push rod 5 is used to pull the middle part of the first nylon rope 4 to the vertical position of the center of the container. The second nylon rope 6 is used to pull the foreign body hanging cage 7. The third nylon rope 8 is used to pull and adjust the position of the camera 9. The camera 9 is used for providing lighting and monitoring inside the container. The endoscope 10 is used for providing lighting and monitoring at the bottom of the container.

[0017] It should be noted that the foreign body salvage main guide rod 1 is a long rod tool. The push rod 5 is a traction nylon rope guide rod, which can provide guidance for the first nylon rope 4. The four-corner gripper 11 is a foreign body grabbing tool.

[0018] For example, if the dimensions of the pressure vessel are Figure 2 As shown, the total length of the first aluminum-plastic tube 2 and the second aluminum-plastic tube 3 can be 11.5m or 13m. The length of the first nylon rope 4 can be 15m, and the first nylon rope 4 can be smoothly moved from the bottom to the edge of the Φ100mm hole of the pressure vessel. The length of the four-corner gripper 11 can be 15m. The push rod 5 is used to pull the middle part of the first nylon rope 4 to the vertical position of the center of the stabilizer.

[0019] According to the technical solution provided in the embodiment of the present application, by fixing two aluminum-plastic tubes (i.e., the first aluminum-plastic tube 2 and the second aluminum-plastic tube 3) in parallel on the main guide rod 1 for foreign body salvage and setting the lower ends of the two aluminum-plastic tubes to be bent, the endoscope 10 and the four-corner gripper 11 are respectively guided to the vicinity of the foreign body through the two aluminum-plastic tubes, thereby achieving the technical effect of guiding the endoscope and the grasping tool, which is conducive to the accurate grasping of foreign bodies. In addition. By fixing one end of the first nylon rope 4 at the bottom of the main guide rod 1 for foreign body salvage, and pushing the first nylon rope 4 with the push rod 5, so as to use the first nylon rope 4 for traction and position adjustment, the technical effect of moving the tool from the lateral position to the center position of the container and adjusting the position is achieved.

[0020] In at least one embodiment of the present application, the lower ends of the first aluminum-plastic tube 2 and the second aluminum-plastic tube 3 are bent 155°. In this way, the normal passage of the endoscope 10 and the four-corner gripper 11 is fully ensured, and the technical effect of the steering of the endoscope 10 and the four-corner gripper 11 is achieved.

[0021] In at least one embodiment of the present application, the main guide rod 1 for salvaging foreign objects is assembled from multiple guide rods, and two adjacent sections of the multiple guide rods are connected by a pin. In this way, the length of the main guide rod 1 for salvaging foreign objects can be adjusted according to the size of the container, and the pin can be used to prevent the risk of falling.

[0022] For example, the foreign body salvaging main guide rod 1 is assembled from four guide rod sections, and the length of each guide rod section is 3m.

[0023] In order to complete the salvage of foreign objects without leaving any safety hazards, after several days and nights of hard work, at least one embodiment of the present application also provides a method for salvaging foreign objects in a nuclear power plant container, which completes the salvage of bottom foreign objects in only 2.5 hours, making a significant contribution to the 26.94-day construction period for the overhaul of the nuclear power plant. The method for salvaging foreign objects in a nuclear power plant container is effective for salvaging deeper foreign objects inside nuclear power equipment.

[0024] refer to Figure 3 The method for salvaging foreign matter in a nuclear power plant container includes the following steps.

[0025] S1: Open the manhole of the voltage stabilizer and install the voltage stabilizer flange and guide rail.

[0026] S2: Tie the third nylon rope in the foreign matter salvaging device in the nuclear power plant container according to the embodiment of the present application to the camera.

[0027] S3: Connect the camera system and the endoscope inspection system, and turn on the built-in light tube and monitoring screen after power on.

[0028] The camera system may be a closed circuit television (CCTV) camera system.

[0029] S4: Send the camera to the central axis inside the stabilizer through the guide rail.

[0030] S5: Adjust the pitch angle of the camera to point vertically downward, and use the third nylon rope to send the camera to a position about 300 mm above the center hole of the support plate under the electric heating element.

[0031] S6: Adjust the rotation and pitch of the camera 9, adjust the angle of the camera 9, and confirm the position of the foreign matter in the lower head area of ​​the stabilizer below the lower support plate of the electric heating element.

[0032] When adjusting the rotation of the camera 9, the rotation angle does not exceed 180° both clockwise and counterclockwise.

[0033] S7: The position of the foreign body is fully monitored through the rotation angle of the camera 9 and the endoscope monitoring screen.

[0034] In at least one embodiment of the present application, reference Figure 4Before step S9, the method for salvaging foreign matter in a nuclear power plant container includes step S8.

[0035] S8: If the main guide rod 1 for foreign body salvage is assembled from multiple guide rods, insert the connecting head of the guide rod into one end of the pipe mouth of another guide rod, align the connecting holes, insert the quick lock pin, and ensure that the connection is firm. Repeat the operation until the main guide rod 1 for foreign body salvage reaches the target length.

[0036] S9: Fix the first aluminum-plastic tube 2 and the second aluminum-plastic tube 3 side by side at the end of the foreign body salvage main guide rod 1, and bend the lower ends of the first aluminum-plastic tube 2 and the second aluminum-plastic tube 3.

[0037] For example, during the process of connecting the foreign body salvage main guide rod 1 , two aluminum-plastic pipes are synchronously and parallelly fixed on the foreign body salvage main guide rod 1 .

[0038] S10: Fix the first nylon rope 4 to the bottom end of the foreign body salvaging main guide rod 1.

[0039] S11: Guide the endoscope 10 and the four-corner grippers 11 to the vicinity of the foreign body through the first aluminum-plastic tube 2 and the second aluminum-plastic tube 3.

[0040] S12: Hang the first nylon rope 4 at the end of the foreign body salvage main guide rod 1 to a fixed point or the operator's hand, send it into the interior through the manhole of the voltage stabilizer, and slowly descend to the center hole of the lower support plate of the electric heating element, then control the foreign body salvage main guide rod 1 to make the four-corner grippers enter the lower area of ​​the lower support plate.

[0041] S13: Use the second nylon rope 6 to place the foreign matter cage 7 into the bottom of the stabilizer.

[0042] S14: Under the monitoring positioning of the endoscope 10 monitoring screen, the foreign matter is grasped using the four-corner gripper 11.

[0043] S15: After grabbing the foreign object, slowly lift the foreign object salvaging main guide rod 1 and put the foreign object into the foreign object hanging cage 7.

[0044] S16: Slowly lift the foreign matter cage 7, take the foreign matter out of the stabilizer, and place the foreign matter in a high-pressure container prepared in advance.

[0045] It should be noted that the combination of the various technical features in the embodiments of the present application is not limited to the combination described in the embodiments of the present application or the combination described in the specific embodiments, and all technical features described in the present application can be freely combined or combined in any way unless there is a contradiction between them.

[0046] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "comprise" and "include" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0047] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0048] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A foreign body salvaging device for a nuclear power plant container, characterized in that: It includes a main guide rod for salvaging foreign objects, a first aluminum-plastic tube, a second aluminum-plastic tube, a first nylon rope, a push rod, a second nylon rope, a foreign object hanging cage, a third nylon rope, a camera, an endoscope and four-corner grabbers, among which: The first aluminum-plastic tube is fixed on the main guide rod for foreign object salvage, and the first aluminum-plastic tube is used as a guide tube for the endoscope. The lower end of the first aluminum-plastic tube is bent to ensure the normal passage of the endoscope; the second aluminum-plastic tube is fixedly connected to the first aluminum-plastic tube and fixed in parallel on the main guide rod for foreign object salvage, and the lower end of the second aluminum-plastic tube is bent to ensure the normal passage of the four-corner gripper; one end of the first nylon rope is fixed to the bottom of the main guide rod for foreign object salvage; the push rod is used to pull the middle part of the first nylon rope to the vertical position of the center of the container; the second nylon rope is used to pull the foreign object cage; the third nylon rope is used to pull and adjust the position of the camera; the camera is used to provide lighting and monitoring inside the container; the endoscope is used to provide lighting and monitoring at the bottom of the container.

2. The foreign body salvaging device for nuclear power plant container according to claim 1, characterized in that: The lower ends of the first aluminum-plastic tube and the second aluminum-plastic tube are both bent 155 degrees.

3. The foreign body salvaging device in a nuclear power plant container according to claim 1 or 2, characterized in that: The foreign body salvage main guide rod is assembled from multiple sections of guide rods, and two adjacent sections of the multiple sections of the guide rods are connected by pin shafts.

4. A method for salvaging foreign matter in a nuclear power plant container, characterized in that: include: Open the manhole of the voltage stabilizer and install the flange and guide rail of the voltage stabilizer; tying the third nylon rope of the foreign body salvaging device in a nuclear power plant container as claimed in any one of claims 1 to 3 to the camera; Connect the camera system and the endoscope inspection system, and turn on the built-in light tube and monitoring screen after power on; Send the camera to the central axis inside the stabilizer through the guide rail; Adjust the camera's pitch angle to face vertically downward, and use the third nylon rope to move the camera to a position about 300mm above the center hole of the support plate under the electric heating element; Adjust the camera rotation, pitch, and angle to confirm the location of foreign matter in the lower head area of ​​the voltage stabilizer below the lower support plate of the electric heating element; The position of foreign matter is fully monitored through the rotation angle of the camera and the endoscope monitoring screen; Fix the first aluminum-plastic tube and the second aluminum-plastic tube in parallel at the end of the main guide rod for foreign body salvage, and bend the lower ends of the first aluminum-plastic tube and the second aluminum-plastic tube; Fix the first nylon rope to the bottom end of the main guide rod for foreign body salvage; Guide the endoscope and the four-corner grippers to the vicinity of the foreign body through the first aluminum-plastic tube and the second aluminum-plastic tube; The first nylon rope at the end of the foreign body salvage main guide rod is tied to a fixed point or the operator's hand, and is sent into the interior through the manhole of the voltage stabilizer. After it is slowly lowered to the center hole of the lower support plate of the electric heating element, the foreign body salvage main guide rod is controlled to make the four-corner grippers enter the lower area of ​​the lower support plate; Use the second nylon rope to place the foreign body cage into the bottom of the stabilizer; Under the monitoring and positioning of the endoscope monitoring screen, use the four-corner gripper to grab the foreign body; After grabbing the foreign object, slowly lift the foreign object salvage main guide rod and put the foreign object into the foreign object cage; Slowly lift the foreign object cage, take the foreign object out of the stabilizer, and place the foreign object in a high-pressure container prepared in advance.

5. The method for salvaging foreign matter in a nuclear power plant container according to claim 4, characterized in that: Before the first aluminum-plastic tube and the second aluminum-plastic tube are fixed side by side at the end of the main guide rod for foreign body salvage, and the lower ends of the first aluminum-plastic tube and the second aluminum-plastic tube are bent, the method further includes: If the main guide rod for foreign body salvage is assembled by multiple guide rods, insert the connecting head of the guide rod into one end of the pipe mouth of another guide rod, align the connecting hole, insert the quick lock pin, make sure the connection is firm, and repeat this operation until the main guide rod for foreign body salvage reaches the target length.

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