Reactor control rod position indicator graphite sealing ring collection device and method

Abstract

The present invention belongs to the field of nuclear power plant reactor maintenance, specifically relating to a device and method for collecting graphite sealing rings for reactor control rod position indicators. The device comprises a clamp, an upper plate, a lower plate semi-ring gasket, a lower plate, an upper plate fixing claw, a torsion spring, a fixing claw shaft, a lower plate fixing claw, and an upper plate semi-ring gasket. The upper plate is seated on the lower plate, with its upper end flush with the upper end of the lower plate and connected by a clamp, allowing the lower plate to rotate relative to the upper plate. The upper plate fixing claw, the lower plate fixing claw, and the torsion spring are connected by a fixing claw shaft, and the lower plate fixing claw is adhesively fixed to the bottom of the lower plate. The present invention reduces the risk of mechanical injury to personnel during operation and significantly reduces the skill level required for such operations.

Description

Technical Field

[0001] The invention belongs to the field of nuclear power plant reactor maintenance, and in particular relates to a device and method for collecting graphite sealing rings of reactor control rod position indicators. Background Art

[0002] The control rod drive mechanism, located at the top of the nuclear reactor, inserts and withdraws the control rod assembly from the fuel assembly to enable startup, power control, and shutdown of the reactor. As a key component of the control rod drive mechanism, the position indicator (PI) measures and displays the height of the control rods within the reactor. It also serves as the primary system pressure boundary (sealed via a graphite seal and fasteners). The graphite seal is installed on the PI flange boss. Two thrust washers, a thrust ring, and six bolts compress the graphite seal to seal the PI from the pressure vessel. The graphite seal is a circular ring with stainless steel sheathing on the upper and lower ends and a graphite center section. A stainless steel wire is inserted between the graphite and stainless steel sheaths to provide additional strength. The graphite seal is tightly attached to the PI flange after prolonged compression, and often becomes attached to the PI flange when the PI is removed.

[0003] Nuclear power plants typically use a 12- or 18-month fuel cycle, requiring a refueling overhaul after each fuel cycle. Each overhaul requires partial disassembly of the control rod drive mechanism. Repair work involving the position indicator involves removing the position indicator from the reactor roof and hoisting it to a storage rack near the inspection well for the internals. The graphite seal is removed, the sealing surface cleaned and inspected, a new graphite seal installed, and the position indicator reinstalled.

[0004] The existing technical solution for removing the graphite sealing ring is to hoist the position indicator to an appropriate height (suspended state), use a flat-blade screwdriver to separate the sealing ring from the position indicator flange, use diagonal pliers to cut the sealing ring, and remove the sealing ring. The existing technical solution has the following problems: the graphite sealing ring is tightly connected to the position indicator flange after long-term compression, and it is difficult to separate the two with a flat-blade screwdriver. It takes 5 to 10 minutes to remove each sealing ring. When removing, the original sealing gasket will be damaged, and the graphite material debris is difficult to effectively control; the position indicator is a long rod cylinder, and it is impossible to collect it in a 360° circumferential direction during collection; the graphite is easy to scatter during the process of separating the sealing ring from the position indicator flange and using diagonal pliers to cut the sealing ring, and the metal ring also has the risk of falling; the operation site is the edge area of ​​the in-core component inspection well (connected to the reactor primary circuit system), and falling objects entering the system will cause foreign matter, posing a hidden danger to the safe operation of the unit.

[0005] Therefore, it is necessary to provide a device and method for collecting graphite sealing rings of reactor control rod position indicators to solve the problems existing in the prior art. Summary of the Invention

[0006] The purpose of the present invention is to provide a device and method for collecting graphite sealing rings of reactor control rod position indicators, thereby reducing the risk of mechanical injury to personnel during operation and greatly lowering the skill level requirements for the operators.

[0007] The technical solution for achieving the purpose of the present invention is as follows:

[0008] A graphite sealing ring collecting device for a reactor control rod position indicator, comprising a clamp, an upper plate, a lower plate half-ring gasket, a lower plate, an upper plate fixing claw, a torsion spring, a fixing claw shaft, a lower plate fixing claw, and an upper plate half-ring gasket;

[0009] The upper plate is located on the lower plate, and the upper end of the upper plate is flush with the upper end of the lower plate. They are connected by a clamp, and the lower plate can rotate relative to the upper plate. The upper plate fixing claw, the lower plate fixing claw and the torsion spring are connected by the fixing claw shaft, and the lower plate fixing claw is glued and fixed to the bottom of the lower plate.

[0010] The clamping piece is an arc-shaped U-shaped clamp.

[0011] There are four clamping pieces, two of which are flush with the end surfaces of the lower plate, and the remaining two have an angle of 30°.

[0012] The bottom of the upper plate is in the shape of a 240° sector, a sealing plate is fixed at the edge, and an upper plate peripheral sealing plate surface is provided at the upper edge.

[0013] The position where the middle of the upper plate outer peripheral closed plate surface contacts the position indicator is the upper plate semi-ring stepped sleeve, and the upper plate semi-ring stepped sleeve is 180 degrees.

[0014] The upper plate semi-ring stepped sleeve comprises an upper plate semi-ring stepped sleeve upper end and an upper plate semi-ring stepped sleeve lower end, and the upper plate semi-ring stepped sleeve upper end and the upper plate semi-ring stepped sleeve lower end are fixedly connected.

[0015] A notch is provided at the edge of the sealing plate, and the notch is used for the passage of the clamping piece during the rotation of the upper plate.

[0016] The notch groove, sealing plate, upper plate semi-ring stepped sleeve and upper plate outer peripheral sealing plate surface are all sheet metal parts.

[0017] The bottom of the lower plate is a 180° fan-shaped structure, and the upper part is provided with a lower plate peripheral closed plate surface.

[0018] The upper peripheral closed plate surface of the upper plate is flush with the upper end of the lower peripheral closed plate surface of the lower plate and is connected by a clamping piece.

[0019] The lower plate comprises a closed plate surface at the outer periphery of the lower plate and a fence plate. The closed plate surface at the outer periphery of the lower plate and the fence plate are both sheet metal parts and are fixedly connected.

[0020] The position where the middle of the lower plate outer peripheral closed plate surface contacts the position indicator is 180 degrees between the upper end of the lower plate semi-annular stepped sleeve and the lower end of the lower plate semi-annular stepped sleeve.

[0021] Nine fence boards are evenly distributed inside the lower plate to form a fence area. The upper end of each fence board is chamfered to prevent foreign matter and debris from being scattered on the end surface.

[0022] The upper plate and the lower plate are coaxially stacked, and the upper plate is placed above the fence area of ​​the lower plate. The fence area serves as a foreign matter collection trough on the one hand, and supports the upper plate on the other hand, serving as a contact surface when the upper plate rotates.

[0023] The upper plate fixing claw, the lower plate fixing claw, the torsion spring and the fixing claw shaft constitute the lower fixing claw, and the upper plate fixing claw, the lower plate fixing claw and the torsion spring are connected via the fixing claw shaft.

[0024] The fixed claw shaft is a hollow shaft. When the two ends of the fixed claw shaft are installed, the ends of the fixed claw shaft expand and extend outward to prevent the fixed claw shaft from axial movement.

[0025] The torsion spring is in an open state in a normal state, and then the upper plate fixing claw and the lower plate fixing claw are closed under the action force of the torsion spring.

[0026] The upper plate fixing claw is a stepped half ring. When in working state, the large-sized end of the upper plate fixing claw and the lower end of the semi-ring stepped sleeve of the upper plate are transmitted to the position indicator under the action of the torsion spring, thereby generating friction, and the small-sized end of the upper plate fixing claw contacts the position indicator, thereby generating friction.

[0027] The lower plate fixing claw is a semi-ring structure, and the lower plate fixing claw is adhered and fixed to the lower end of the lower plate semi-ring stepped sleeve. Under the action of the torsion spring, the force is transmitted to the position indicator through the lower plate and the lower plate semi-ring washer, thereby generating friction.

[0028] The method for collecting the graphite sealing ring of the reactor control rod position indicator comprises the following steps:

[0029] Step 1: Open the fixed claw below the graphite sealing ring scattered collection device, and rotate the upper plate counterclockwise until the opening meets the position indicator entering the center of rotation of the graphite sealing ring scattered collection device;

[0030] Step 2: Move the graphite sealing ring scattered collection device close to the position indicator so that the position indicator enters the central rotation axis of the graphite sealing ring scattered collection device;

[0031] Step 3: Rotate the upper plate clockwise to form a closed area with the lower plate;

[0032] Step 4: Loosen the fixing claw below the graphite sealing ring scattered collection device, so that the graphite sealing ring scattered collection device is supported on the position indicator under the force of the torsion spring of the fixing claw below the graphite sealing ring scattered collection device, and check whether the graphite sealing ring scattered collection device is firmly supported;

[0033] Step 5: Open the fixed claw below the graphite sealing ring scattered collection device, and rotate the upper plate counterclockwise to open to a degree that satisfies the position indicator and is away from the center of rotation of the graphite sealing ring scattered collection device;

[0034] Step 6: Separate the graphite sealing ring scattered collection device from the position indicator, and rotate the upper plate clockwise to form a closed area with the upper plate and the lower plate;

[0035] Step 7: Loosen the fixing claws below the graphite sealing ring scattered collection device and remove the scattered foreign matter in the upper and lower plate fence areas.

[0036] The beneficial technical effects of the present invention are:

[0037] (1) The graphite sealing ring scattered collection tool provided by the present invention has high working efficiency. It only takes 2 to 3 minutes to remove each sealing ring, which improves the working efficiency by 3 to 4 times on average.

[0038] (2) The present invention can achieve 100% collection of waste graphite sealing rings, eliminating the risk of foreign matter in the process system in the existing technical solutions;

[0039] (3) The use of the graphite sealing ring scattered collection device in the present invention reduces the amount of radioactive waste generated during the entire graphite sealing ring removal process;

[0040] (4) The present invention reduces the risk of mechanical injury to personnel during operation;

[0041] (5) The sealing ring scattered collection tool of the present invention is easy to operate, which greatly reduces the skill level requirements of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a depression-angle isometric view of a graphite sealing ring collecting device for a reactor control rod position indicator provided by the present invention;

[0043] Figure 2 This is an elevation isometric view of a graphite sealing ring collecting device for a reactor control rod position indicator provided by the present invention;

[0044] Figure 3 A top view of a graphite sealing ring collecting device for a reactor control rod position indicator provided by the present invention;

[0045] Figure 4A top view of a fixing claw below a graphite sealing ring collecting device of a reactor control rod position indicator provided by the present invention;

[0046] Figure 5 This is a diagram of the fixing claw BB below the graphite sealing ring collecting device of the reactor control rod position indicator provided by the present invention;

[0047] Figure 6 This is a CC diagram of the fixing claw below the graphite sealing ring collecting device of a reactor control rod position indicator provided by the present invention;

[0048] Figure 7 A top view of the upper plate of a graphite sealing ring collecting device for a reactor control rod position indicator provided by the present invention;

[0049] Figure 8 This is a DD diagram of the upper plate of a graphite sealing ring collecting device for a reactor control rod position indicator provided by the present invention;

[0050] Figure 9 A side view of the upper plate of a graphite sealing ring collecting device for a reactor control rod position indicator provided by the present invention;

[0051] Figure 10 This is a diagram of the lower plate of a graphite sealing ring collecting device for a reactor control rod position indicator provided by the present invention;

[0052] Figure 11 A top view of the lower plate of a graphite sealing ring collecting device for a reactor control rod position indicator provided by the present invention;

[0053] In the figure: 201-clamp; 202-upper plate; 203-lower plate semi-ring gasket; 204-lower plate; 205-upper plate fixing claw; 206-torsion spring; 207-fixing claw shaft; 208-lower plate fixing claw; 209-upper plate semi-ring gasket; 1601-notch groove; 1602-sealing plate; 1603-upper plate semi-ring stepped sleeve; 16031-upper end of upper plate semi-ring stepped sleeve; 16032-lower end of upper plate semi-ring stepped sleeve; 1604-upper plate peripheral closed plate surface; 1901-lower plate peripheral closed plate surface; 1902-fence plate; 19031-upper end of lower plate semi-ring stepped sleeve; 19032-lower end of lower plate semi-ring stepped sleeve; 2001-fence area. DETAILED DESCRIPTION

[0054] In order to enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments described in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0055] like Figure 1 、 Figure 2 and Figure 3 As shown, the present invention provides a reactor control rod position indicator graphite sealing ring collection device, which includes an upper plate 202, a lower plate half-ring gasket 203, a lower plate 204, an upper plate fixing claw 205, a torsion spring 206, a fixing claw shaft 207, a lower plate fixing claw 208 and an upper plate half-ring gasket 209.

[0056] The upper plate 202 is located on the fence area 2001 of the lower plate 204. The upper end of the upper plate 202 is flush with the upper end of the lower plate 204 and is connected by a clamp 201. The clamp 201 is evenly distributed on the outer wall of the upper end of the upper plate 202 by pasting. The lower plate 204 can rotate relative to the upper plate 202.

[0057] The lower plate half ring gasket 203 is pasted inside the lower plate 204 for fixed connection.

[0058] The upper plate fixing claw 205, the lower plate fixing claw 208 and the torsion spring 206 are connected by the fixing claw shaft 207, and the whole realizes the clamping function.

[0059] The fixed claw shaft 207 passes through the torsion spring 206 .

[0060] The upper plate half ring gasket 209 is pasted inside the upper plate 202 for fixed connection.

[0061] The lower plate fixing claws 208 are glued and fixed to the outside of the lower plate 204 to achieve a fixed connection.

[0062] The collecting device is a vertical layered rotating opening and closing device (see Figure 1 、 Figure 2 、 Figure 3 ), Upper plate 202 (see Figure 7 、 Figure 8 、 Figure 9 ) The bottom is a 240° fan-shaped and the periphery is closed. The upper plate 202 includes a notch groove 1601, a sealing plate 1602, an upper plate semi-annular stepped sleeve 1603 and an upper plate periphery closed plate surface 1604, wherein the notch groove 1601, the sealing plate 1602, the upper plate semi-annular stepped sleeve 1603 and the upper plate periphery closed plate surface 1604 are all sheet metal parts, which are welded to each other, or can be an integrally formed injection molded part.

[0063] The upper plate's outer periphery, enclosing plate 1604, is 180 degrees from the center, where it contacts the position indicator. This upper plate's semi-annular stepped sleeve 1603 comprises an upper semi-annular stepped sleeve upper end 16031 and a lower semi-annular stepped sleeve lower end 16032. These upper and lower semi-annular stepped sleeve upper and lower ends 16031 and 16032 are welded sheet metal components or can be integrally molded injection molded parts. A notched slot 1601 is defined along the edge of the sealing plate 1602, but does not extend to the bottom. This notched slot 1601 allows the clamping member 201 to pass through during the upper plate's rotation.

[0064] Lower plate 204 (see Figure 10 、 Figure 11 ) It is a 180° fan-shaped plate when viewed from above, with a closed periphery. The lower plate 204 includes a lower plate peripheral closed panel 1901 and a fence plate 1902. The lower plate peripheral closed panel 1901 and the fence plate 1902 are both sheet metal parts welded to each other. The position in the middle of the lower plate peripheral closed panel 1901 that contacts the position indicator is the 180° upper end 19031 of the lower plate semi-annular stepped sleeve and the lower end 19032 of the lower plate semi-annular stepped sleeve. There are 9 fence plates 1902 evenly distributed inside the lower plate 204, which are called fence areas 2001. The upper end of each fence plate 1902 is chamfered to prevent foreign matter and debris from being scattered on the end surface. The fence area 2001 serves as a foreign matter collection trough on the one hand, and on the other hand, it carries the upper plate 202 and serves as a contact surface when the upper plate 202 rotates.

[0065] The upper plate fixing claw 205, the lower plate fixing claw 208, the torsion spring 206 and the fixing claw shaft 207 constitute the lower fixing claw (see Figure 4 、 Figure 5 、 Figure 6 ), upper plate fixing claw 205, lower plate fixing claw 208, and torsion spring 206 are connected by fixing claw shaft 207. Fixing claw shaft 207 is a hollow shaft. During installation, the ends of fixing claw shaft 207 expand outward to prevent axial movement of fixing claw shaft 207. Torsion spring 206 is normally open, and the force of torsion spring 206 then closes upper plate fixing claw 205 and lower plate fixing claw 208.

[0066] The upper plate fixing claw 205 is a stepped half-ring. When in operation, the large end of the upper plate fixing claw 205 and the lower end of the half-ring stepped sleeve of the upper plate 202 are forced by the torsion spring 206, transmitting friction to the position indicator. The small end of the upper plate fixing claw 205 contacts the position indicator, generating friction.

[0067] The lower plate fixing claw 208 is a semi-ring structure, which is adhered and fixed to the semi-ring stepped sleeve lower end 19032 of the lower plate 204. Under the action of the torsion spring 206, the force is transmitted to the position indicator through the lower plate 204 and the lower plate semi-ring washer 203, thereby generating friction.

[0068] The upper plate 202 and the lower plate 204 are coaxially stacked, and the upper plate 202 is placed above the fence area 2001 of the lower plate 204. The lower plate 204 supports the upper plate 202. The upper peripheral closed plate surface 1604 of the upper plate 202 is flush with the upper end of the lower peripheral closed plate surface 1901 of the lower plate 204, and are connected by a clip 201. The clip 201 is an arc-shaped U-shaped clip, and the inner side of the long end is adhered and fixed to the lower peripheral closed plate surface 1901. There are four clips 201, two of which are flush with the end faces of the lower plate 204, and the remaining two are at an angle of 30°. This layout ensures that when the upper plate 202 rotates coaxially on the upper part of the lower plate 204, there are always two clips 201 to fix it.

[0069] The present invention also provides a method for collecting a graphite sealing ring of a reactor control rod position indicator, the method comprising the following steps:

[0070] Step 1: Open the fixed claw below the graphite sealing ring scattered collection device and rotate the upper plate 202 counterclockwise to make the opening meet the position indicator entering the center of rotation of the graphite sealing ring scattered collection device;

[0071] Step 2: Move the graphite sealing ring scattered collection device close to the position indicator so that the position indicator enters the central rotation axis of the graphite sealing ring scattered collection device;

[0072] Step 3: Rotate the upper plate 202 clockwise to form a closed area with the lower plate 204;

[0073] Step 4: Loosen the fixing claw below the graphite sealing ring scattered collection device, so that the graphite sealing ring scattered collection device is supported on the position indicator under the force of the torsion spring 206 of the fixing claw below the graphite sealing ring scattered collection device, and check whether the graphite sealing ring scattered collection device is firmly supported;

[0074] Step 5: Open the fixed claw below the graphite sealing ring scattered collection device and rotate the upper plate 202 counterclockwise to open to a degree that satisfies the position indicator and is separated from the center of rotation of the graphite sealing ring scattered collection device;

[0075] Step 6: Separate the graphite sealing ring scattered collection device from the position indicator, and rotate the upper plate 202 clockwise to form a closed area with the upper plate 202 and the lower plate 204;

[0076] Step seven: loosen the fixing claws below the graphite sealing ring scattered collection device to remove the scattered foreign matter in the fence area 2001 of the upper plate 202 and the lower plate 204.

[0077] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. However, the present invention is not limited to the above embodiments. Various modifications can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Any content not described in detail in the present invention may be adapted from existing technologies.

Claims

1. A graphite sealing ring collection device for a reactor control rod position indicator, characterized in that: The device comprises a clamp (201), an upper plate (202), a lower plate semi-ring washer (203), a lower plate (204), an upper plate fixing claw (205), a torsion spring (206), a fixing claw shaft (207), a lower plate fixing claw (208) and an upper plate semi-ring washer (209); The upper plate (202) is seated on the lower plate (204), and the upper end of the upper plate (202) is flush with the upper end of the lower plate (204). The upper plate (202) and the lower plate (204) are connected by a clamp (201). The lower plate (204) can rotate relative to the upper plate (202). The upper plate fixing claw (205), the lower plate fixing claw (208) and the torsion spring (206) are connected by a fixing claw shaft (207). The lower plate fixing claw (208) is glued and fixed to the bottom of the lower plate (204). The upper plate (202) includes a notch groove (1601), a sealing plate (1602), an upper plate semi-annular stepped sleeve (1603), and an upper plate peripheral closed plate surface (1604), wherein the notch groove (1601), the sealing plate (1602), the upper plate semi-annular stepped sleeve (1603), and the upper plate peripheral closed plate surface (1604) are all sheet metal parts, which are welded to each other, or can be an integrally formed injection molded part; The upper plate semi-annular stepped sleeve (1603) is 180 degrees in contact with the position indicator in the middle of the upper plate peripheral closed plate surface (1604), and the upper plate semi-annular stepped sleeve (1603) is divided into an upper plate semi-annular stepped sleeve upper end (16031) and an upper plate semi-annular stepped sleeve lower end (16032); the upper plate semi-annular stepped sleeve upper end (16031) and the upper plate semi-annular stepped sleeve lower end (16032) are sheet metal parts welded together, or can be an integrally formed injection molded part; a notch groove (1601) is formed at the edge of the sealing plate (1602), but does not reach the bottom, and the notch groove (1601) allows the clamping member (201) to pass through during the rotation of the upper plate (202); The lower plate (204) is 180° fan-shaped when viewed from above, and has a closed outer periphery. The lower plate (204) includes a lower plate outer periphery closed plate surface (1901) and a fence plate (1902); the lower plate outer periphery closed plate surface (1901) and the fence plate (1902) are both sheet metal parts welded together; the position in the middle of the lower plate outer periphery closed plate surface (1901) that contacts the position indicator is the 180° upper end (19031) of the lower plate semi-annular stepped sleeve and the lower end (19032) of the lower plate semi-annular stepped sleeve; 9 fence plates (1902) are evenly distributed inside the lower plate (204), which are called fence areas (2001), and the upper end of each fence plate (1902) is chamfered to prevent foreign matter and debris from being scattered on the end surface; the fence area (2001) serves as a foreign matter collection trough on the one hand, and supports the upper plate (202) on the other hand, serving as a contact surface when the upper plate (202) rotates; The upper plate semi-ring stepped sleeve (1603) comprises an upper plate semi-ring stepped sleeve upper end (16031) and an upper plate semi-ring stepped sleeve lower end (16032), and the upper plate semi-ring stepped sleeve upper end (16031) and the upper plate semi-ring stepped sleeve lower end (16032) are fixedly connected; The upper plate peripheral closed plate surface (1604) of the upper plate (202) is flush with the upper end of the lower plate peripheral closed plate surface (1901) of the lower plate (204) and is connected by a clamping member; The upper plate fixing claw (205), the lower plate fixing claw (208), the torsion spring (206) and the fixing claw shaft (207) form the lower fixing claw, and the upper plate fixing claw (205), the lower plate fixing claw (208) and the torsion spring (206) are connected via the fixing claw shaft (207); The fixed claw shaft (207) is a hollow shaft. When the two ends of the fixed claw shaft (207) are installed, the ends of the fixed claw shaft (207) expand and extend outward to prevent the fixed claw shaft (207) from axial movement. The torsion spring (206) is in an open state in a normal state, and then the upper plate fixing claw (205) and the lower plate fixing claw (208) are closed under the action of the torsion spring (206); The upper plate fixing claw (205) is a stepped half ring. In the working state, the large-sized end of the upper plate fixing claw (205) and the lower end (16032) of the upper plate half ring stepped sleeve are transmitted to the position indicator under the action of the torsion spring (206), thereby generating friction. The small-sized end of the upper plate fixing claw (205) contacts the position indicator, thereby generating friction. The lower plate fixing claw (208) is a semi-ring structure, and the lower plate fixing claw (208) is adhered and fixed to the lower end (19032) of the lower plate semi-ring stepped sleeve. Under the action of the torsion spring (206), the force is transmitted to the position indicator through the lower plate (204) and the lower plate semi-ring washer (203), thereby generating friction.

2. The reactor control rod position indicator graphite sealing ring collecting device according to claim 1, characterized in that: The clamping piece (201) is an arc-shaped U-shaped clamp.

3. The reactor control rod position indicator graphite sealing ring collection device according to claim 2, characterized in that: There are four clamping members (201), two of which are flush with the end faces of the lower plate (204), and the remaining two have an included angle of 30°.

4. The reactor control rod position indicator graphite sealing ring collection device according to claim 3, characterized in that: The bottom of the upper plate (202) is in the shape of a 240° sector, a sealing plate (1602) is fixed at the edge, and an upper plate peripheral sealing plate surface (1604) is provided at the upper edge.

5. The reactor control rod position indicator graphite sealing ring collecting device according to claim 4, characterized in that: The position in the middle of the upper plate outer peripheral closed plate surface (1604) that contacts the position indicator is the upper plate semi-annular stepped sleeve (1603), and the upper plate semi-annular stepped sleeve (1603) is 180 degrees.

6. The reactor control rod position indicator graphite sealing ring collection device according to claim 5, characterized in that: The upper plate semi-ring stepped sleeve (1603) comprises an upper plate semi-ring stepped sleeve upper end (16031) and an upper plate semi-ring stepped sleeve lower end (16032), and the upper plate semi-ring stepped sleeve upper end (16031) and the upper plate semi-ring stepped sleeve lower end (16032) are fixedly connected.

7. The reactor control rod position indicator graphite sealing ring collection device according to claim 6, characterized in that: A notch groove (1601) is provided at the edge of the sealing plate (1602), and the notch groove (1601) allows the clamping member (201) to pass through during the rotation of the upper plate (202).

8. The reactor control rod position indicator graphite sealing ring collection device according to claim 7, characterized in that: The notched groove (1601), the sealing plate (1602), the upper plate semi-annular stepped sleeve (1603) and the upper plate peripheral closed plate surface (1604) are all sheet metal parts.

9. The reactor control rod position indicator graphite sealing ring collection device according to claim 8, characterized in that: The bottom of the lower plate (204) is a 180° fan-shaped structure, and the upper part is provided with a lower plate peripheral closed plate surface (1901).

10. The reactor control rod position indicator graphite sealing ring collection device according to claim 9, characterized in that: The upper plate peripheral closed plate surface (1604) of the upper plate (202) and the upper end of the lower plate peripheral closed plate surface (1901) of the lower plate (204) are flush and connected via a clamp (201).

11. The reactor control rod position indicator graphite sealing ring collecting device according to claim 10, characterized in that: The upper plate (202) and the lower plate (204) are coaxially stacked, and the upper plate (202) is placed above the fence area (2001) of the lower plate (204). The fence area (2001) serves as a foreign matter collection trough on the one hand, and supports the upper plate (202) on the other hand, serving as a contact surface when the upper plate (202) rotates.

12. The method for collecting graphite seal rings of reactor control rod position indicators according to claim 11, characterized in that: The method comprises the following steps: Step 1: open the fixed claw below the graphite sealing ring scattered collection device, and rotate the upper plate (202) counterclockwise to make the opening meet the position indicator entering the center of rotation of the graphite sealing ring scattered collection device; Step 2: Move the graphite sealing ring scattered collection device close to the position indicator so that the position indicator enters the central rotation axis of the graphite sealing ring scattered collection device; Step 3: rotating the upper plate (202) clockwise to form a closed area between the upper plate (202) and the lower plate (204); Step 4, loosen the fixing claw below the graphite sealing ring scattering collection device, so that the graphite sealing ring scattering collection device is supported on the position indicator under the action of the torsion spring (206) of the fixing claw below the graphite sealing ring scattering collection device, and check whether the graphite sealing ring scattering collection device is supported firmly; Step 5, open the fixed claw below the graphite sealing ring scattered collection device, and rotate the upper plate (202) counterclockwise to make the opening satisfy the position indicator to be separated from the center of rotation of the graphite sealing ring scattered collection device; Step 6: Separate the graphite sealing ring scattered collection device from the position indicator, and rotate the upper plate (202) clockwise to form a closed area between the upper plate (202) and the lower plate (204); Step seven, loosen the fixing claws below the graphite sealing ring scattered collection device, and remove the scattered foreign matter in the fence area (2001) of the upper plate (202) and the lower plate (204).

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