Insertion device of Reactor Core Support Barrel

Abstract

The present invention relates to a method for inserting a core support barrel into a reactor vessel, comprising a drive motor and a drive means for fixing and releasing the core support barrel as it rotates in a forward or reverse direction by the drive motor, wherein the drive means is connected to the drive motor and rotates by the driving force of the drive motor, and comprises a main shaft having a long length in the longitudinal direction of the core support barrel, a screw part extending from the lower part of the main shaft and having a screw surface formed on its outer circumference, with screw surfaces formed in different directions on the upper and lower parts of the screw part centered around a stopper coupled in the center, a first lifting / lowering block mounted on the upper side of the screw part and moving up or down as the screw part rotates, a second lifting / lowering block mounted on the lower side of the screw part and moving up or down in the opposite direction to the first lifting / lowering block as the screw part rotates, a horizontal bar coupled horizontally to the upper end of the main shaft but configured not to receive the rotational force of the main shaft, and the horizontal bar A connecting member comprising a pair of vertical bars linked vertically at both ends and a contact piece linked to the lower end of the vertical bars and in direct contact with the inner surface of the core support barrel, and a plurality of link rods having both ends linked to the first and second lifting / lowering blocks of the connecting member to connect the connecting member and the first and second lifting / lowering blocks, wherein as the screw portion is rotated in a forward or reverse direction by a driving motor, the contact piece expands outward to fix and deform the core support barrel into an elliptical shape, or contracts inward to release the connection with the core support barrel, thereby having the effect of allowing the core support barrel to be easily mounted inside the reactor vessel by gripping the core support barrel and applying force so that the core support barrel is inserted into the reactor vessel while in an elliptical deformed state.

Description

Technology Field

[0001] The present invention relates to a reactor core support barrel insertion device for inserting a core support barrel into the interior of a reactor vessel. Background Technology

[0003] The internal components of a typical nuclear reactor consist of upper and lower internal structures.

[0004] The upper internal structure refers to an upper guide assembly comprising a control rod guide tube assembly and an upper guide assembly barrel, a guide support structure cover, and a nuclear fuel bundle alignment plate.

[0005] The lower internal structure includes a core support barrel, a core shroud, and a lower support structure.

[0006] To ensure the proper operation of the reactor, the upper and lower internal structures must be accurately aligned within the reactor vessel.

[0007] Meanwhile, FIG. 1 is a planar schematic diagram of a core support barrel (20), which is a lower internal structure, inserted and mounted inside a general reactor vessel (10).

[0008] Referring to FIG. 1, the coolant discharged from the reactor coolant pump (not shown) flows into the interior of the reactor vessel (10) through the low-temperature pipe (14) of the reactor vessel (10), is heated to a high temperature by the thermal energy generated by the nuclear reaction of the core, which is a nuclear fuel bundle inside the reactor vessel, is discharged through the high-temperature pipe (12) of the reactor vessel, circulates through the steam generator to heat the secondary side water (for driving the steam turbine) and convert it into steam, and then cools down. The coolant with a lowered temperature is pumped by the reactor coolant pump and reintroduced into the reactor vessel (10) through the low-temperature pipe (14), thereby undergoing a process of recovering heat generated from the core and heating.

[0009] At this time, a core support barrel (20) is installed inside the reactor vessel (10), and the core undergoes a nuclear reaction in the internal space of the core support barrel (20), heating the coolant to a high temperature, and then transferring it to the high-temperature pipe (12) of the reactor vessel through the discharge pipe (22) of the core support barrel.

[0010] Conventionally, a gap (G) is formed between the inner surface of the reactor vessel (10) and the outer surface of the core support barrel (20), and there was a problem of reduced efficiency due to bypass flow occurring through the gap. Prior art literature

[0012] Registered Patent Publication No. 10-1651412 The problem to be solved

[0013] The present invention has been devised to solve this problem and aims to provide a reactor core support barrel insertion device that causes a cylindrical core support barrel to deform into an elliptical shape by gripping the core support barrel and applying force, separates the elliptically deformed core support barrel from the core support barrel insertion device after it is inserted into the reactor vessel, and stably mounts the core support barrel to the reactor vessel by means of the elastic restoring force of the core support barrel itself.

[0014] In particular, the invention aims to provide a reactor core support barrel insertion device in which the discharge pipe of the core support barrel is installed so as to be stably attached to the hot pipe of the reactor vessel, thereby preventing the formation of a gap (G) between the discharge pipe and the hot pipe. means of solving the problem

[0016] The present invention is for inserting a core support barrel into the interior of a reactor vessel and is characterized by comprising a drive motor and a drive means for fixing and releasing the core support barrel as it is rotated in a forward or reverse direction by the drive motor.

[0017] In addition, the driving means comprises a main shaft having a long length in the longitudinal direction of the core support barrel, which is connected to the driving motor and rotated by the driving force of the driving motor; a screw part extending from the lower part of the main shaft and having a screw surface formed on its outer circumference, with screw surfaces formed in different directions on the upper and lower parts of the screw part centered around a stopper coupled in the center; a first lifting / lowering block mounted on the upper side of the screw part and moving up or down as the screw part rotates; a second lifting / lowering block mounted on the lower side of the screw part and moving up or down in the opposite direction to the first lifting / lowering block as the screw part rotates; a horizontal bar coupled horizontally to the upper end of the main shaft but configured not to receive the rotational force of the main shaft; a pair of vertical bars linked vertically to both ends of the horizontal bar; a connecting member including a contact piece linked to the lower end of the vertical bar and in direct contact with the inner circumference of the core support barrel; and the connecting member and To connect the first and second lifting / lowering blocks, the device includes a plurality of link rods, each having its ends linked to the first and second lifting / lowering blocks, respectively. As the screw portion is rotated in the forward or reverse direction by a driving motor, the contact piece expands outward to fix the core support barrel and deform it into an elliptical shape, or contracts inward to release the connection with the core support barrel.

[0018] In addition, the bottom surface of the horizontal bar is characterized by having a fitting groove formed therein for fitting and fixing the upper end of the core support barrel.

[0019] In addition, the contact pieces are characterized by being arranged such that a pair face each other and including an outer surface having a predetermined curvature. Effects of the invention

[0021] Therefore, the present invention has the effect of allowing the core support barrel to be easily mounted inside the reactor vessel by gripping the core support barrel and applying force so that the core support barrel is inserted into the reactor vessel while deformed into an elliptical shape.

[0022] In addition, the elliptical core support barrel is separated from the core support barrel after being inserted into the reactor vessel, and is stably mounted to the reactor vessel by the elastic restoring force due to the material of the core support barrel, thereby having the effect of preventing the formation of a gap that was previously formed between the reactor vessel and the core support barrel.

[0023] In particular, the discharge pipe of the core support barrel is installed so as to be stably attached to the high-temperature pipe of the reactor vessel, thereby having the effect of preventing the formation of a gap (G) between the discharge pipe and the high-temperature pipe. Brief explanation of the drawing

[0025] Figure 1 is a planar schematic diagram of a typical reactor vessel and core support barrel. FIG. 2 is a perspective view of the driving means of the reactor core support barrel insertion device according to the present invention. FIG. 3 is a front view of a reactor core support barrel insertion device according to the present invention. Figure 4 is a diagram showing the state in which the contact piece in Figure 3 is expanded. Figure 5 is a diagram showing the use of an insertion device according to the present invention. FIG. 6 is a state diagram of a core support barrel according to the use of the reactor core support barrel insertion device according to the present invention, wherein (a) is a state diagram when the core support barrel, deformed into an elliptical shape, is inserted into the reactor vessel, and (b) is a state diagram when the insertion device is separated from the core support barrel in state (a). Specific details for implementing the invention

[0026] Hereinafter, the technical concept of the present invention will be explained in more detail using the attached drawings.

[0027] The attached drawings are merely examples illustrated to further explain the technical concept of the present invention, and therefore the technical concept of the present invention is not limited to the form of the attached drawings.

[0028] Figure 1 is a planar schematic diagram of a typical reactor vessel and core support barrel.

[0029] The reactor core support barrel insertion device (100) according to the present invention is a mechanism for inserting and mounting a core support barrel (20) inside a reactor vessel (10).

[0030] More specifically, the core support barrel insertion device (100) is coupled to the core support barrel (20) and grips the core support barrel, thereby causing the cylindrical core support barrel to be deformed into an elliptical shape by applying force.

[0031] After the core support barrel, which has been deformed into an elliptical shape, is inserted into the reactor vessel (10), when the core support barrel insertion device (100) is separated from the core support barrel (20), the core support barrel is restored by elastic force and is stably mounted on the reactor vessel (10).

[0032] As such, the present invention is for inserting a core support barrel into the interior of a reactor vessel, and the core support barrel insertion device (100) of the present invention includes a driving motor (M) and a driving means (D) that fixes and releases the core support barrel (20) as it is rotated in a forward or reverse direction by the driving motor.

[0033] FIG. 2 is a perspective view of a driving means of a reactor core support barrel insertion device according to the present invention, FIG. 3 is a front view of a reactor core support barrel insertion device according to the present invention, and FIG. 4 is a drawing showing the contact piece in FIG. 3 in an expanded state.

[0034] As illustrated in FIGS. 2 to 4, the driving means (D) comprises a main shaft (110), a screw portion (115) extending from the lower part of the main shaft, a horizontal bar (120) connected horizontally to the upper end of the main shaft, a pair of vertical bars (130) connected vertically to both ends of the horizontal bar, and a gripping unit (U) mounted on the vertical bars and the screw portion to fix and apply force to the core support barrel (10).

[0035] First, the main shaft (110) has a long length in the longitudinal direction of the core support barrel (20) and is an element connected to a drive motor (M) and rotated by the driving force of the drive motor.

[0036] A screw portion (115) is extended and formed at the lower part of the main shaft, and the screw portion receives rotational force from a drive motor.

[0037] A screw surface is formed on the outer surface of the screw part (115), wherein a right-hand screw is formed on the upper outer surface and a left-hand screw is formed on the lower outer surface, centered on the stopper (S1) coupled to the center.

[0038] In addition, a stopper (S) may be additionally attached to the upper and lower ends of the screw part (115) as needed by the user, and this is not limited to the present invention.

[0039] Additionally, although the present invention describes that a right-hand thread is formed on the upper side of the screw part and a left-hand thread is formed on the lower side centered on the stopper, this means that screw surfaces are formed in different directions on the upper and lower sides of the screw part centered on the stopper, and the direction in which the screw surfaces are formed can be changed according to the user's needs.

[0041] Next, a horizontal bar (120) is connected to the top of this main shaft (110) in a horizontal direction.

[0042] The horizontal bar (120) is installed to pass through the main shaft (110), but is configured so as not to receive rotational force from the main shaft by means of a member such as a bearing.

[0043] In addition, a fitting groove (122) for connection with the top of the core support barrel (20) is formed on the bottom surface of the horizontal bar (120).

[0044] As shown in FIG. 5, the upper edge of the core support barrel is press-fitted into the fitting groove (122), and as a result, the core support barrel is stably supported in the reactor core support barrel insertion device (100).

[0045] In addition, in the present invention, the insertion groove (122) is formed so that the core support barrel insertion device (100) supports the upper end of the core support barrel (20), but a separate insertion member (not shown in the drawing) may be attached to the lower surface of the horizontal bar, and this is not limited to the present invention.

[0046] In addition, in the present invention, a fitting groove (122) is formed by forming a pair of fitting protrusions on the bottom surface of the horizontal bar (120) at a predetermined distance apart.

[0047] More specifically, in the present invention, a fitting projection (124) and a joint member (126) are formed on the bottom surface of the horizontal bar (120) at a certain distance apart and protrude downward, and a fitting groove (122) is formed between the fitting projection and the joint, but this is merely an example and is not limited to the present invention.

[0049] Additionally, a pair of vertical bars (130) are linked to both ends of the horizontal bar (120) in a vertical direction.

[0050] As illustrated in FIGS. 3 and 4, in the present invention, a fitting projection (124) protruding downward is formed at each end of a horizontal bar (120), and a joint member (126) is connected so as to be spaced apart from the fitting projection (124) at a predetermined distance, thereby forming a fitting groove (122) between the joint member (126) and the fitting projection (124). By linking a vertical bar (130) to the joint member (126), the vertical bar (130) is positioned inside the fitting groove (122) relative to the horizontal bar (120).

[0051] As illustrated in FIGS. 3 to 5, the upper end of the vertical bar (130) is connected to a joint member (126) and fixed in a fixed position, and rotates by a predetermined angle by a hinge connection, and the lower end is connected to a connecting member (140) to be described later and moves together as the connecting member moves left and right. Therefore, the upper end of the vertical bar is positioned inward by a predetermined distance from both ends of the horizontal bar so that even if the lower end of the vertical bar moves left and right, it does not go beyond both ends of the horizontal bar.

[0053] Meanwhile, a gripping unit (U) is mounted on the vertical bar (130) and the screw part (115).

[0054] The above gripping unit (U) is an element that expands outward or contracts inward as the screw part (115) is rotated in the forward or reverse direction by the drive motor, thereby fixing and releasing the core support barrel (20) and deforming it into an elliptical shape.

[0055] More specifically, the gripping unit (U) includes a connecting member (140), a link rod (150), and a lifting / lowering block (160).

[0056] First, the connecting member (140) is an element that is linked to the lower end of each of the pair of vertical bars (130), and since the present invention includes two vertical bars, the connecting member (140) is also provided in two.

[0057] More specifically, the connecting member (140) includes a contact piece (142), a first connecting part (144), and a second connecting part (146).

[0058] The above contact piece (142) is an element that comes into direct contact with the inner surface of the core support barrel (20).

[0059] The above contact pieces (142) are arranged such that a pair of them face each other. When the contact pieces are inserted into the core support barrel (20), they come into contact with the inner wall surface of the core support barrel and perform the function of directly deforming the shape of the core support barrel.

[0060] More specifically, as shown in FIG. 5, the contact piece (142) is positioned in a direction perpendicular to the discharge pipe (22) of the core support barrel (20) when inserted into the interior of the core support barrel (20) to grip the core support barrel.

[0061] In order to stably support the core support barrel, it is preferable that the outer surface of the contact piece be provided to have a predetermined curvature.

[0062] This connecting member (140) is connected to the screw part (115) by a link rod (150).

[0063] The above link rod (150) is mounted on a screw part and has both ends linked to a lifting / lowering block (160) that moves up and down and a connecting member (140), respectively. The link rod (150) guides the contact piece (142) of the connecting member (140) to expand or contract radially as the lifting / lowering block (160) moves up and down.

[0064] The above lifting block (160) includes a first lifting block (161) and a second lifting block (163).

[0065] The first lifting / lowering block (161) is mounted on the upper side of the screw part and is raised / lowered as the screw part rotates, and the second lifting / lowering block (163) is mounted on the lower side of the screw part and is arranged to be raised / lowered in the opposite direction to the first lifting / lowering block as the screw part rotates.

[0066] Meanwhile, the above-mentioned connecting member (140) must be connected to both the first lifting / lowering block and the second lifting / lowering block.

[0067] That is, two link rods are coupled to a single connecting member and connected to the first lifting / lowering block and the second lifting / lowering block, respectively, and since the present invention includes two connecting members, the present invention is configured to include a total of four link rods.

[0068] Including this configuration, the gripping unit (U) of the present invention, as shown in (a) of FIGS. 4 to 6, when the screw part (115) is rotated forward and the first lifting / lowering block is lowered, the second lifting / lowering block is raised and lowered, and the contact piece (142) is expanded radially and fixed to the inner wall surface of the core support barrel (20), and furthermore, a force is applied to the core support barrel so that the core support barrel is deformed into an elliptical shape.

[0069] As shown in FIG. 5, the contact piece (142) is positioned in a direction perpendicular to the discharge pipe (22) of the core support barrel (20) so that when the core support barrel is deformed into an ellipse, the discharge pipe (22) is positioned on the short axis of the ellipse.

[0070] Accordingly, when the core support barrel (20), which has been deformed into an elliptical shape, is inserted into the reactor vessel (10), the high-temperature tube (12) of the reactor vessel (10) and the discharge tube (22) of the core support barrel (20) are positioned facing each other but spaced apart by a predetermined distance.

[0071] Afterwards, as shown in FIG. 3, when the screw part (115) is rotated in reverse, the first lifting block is raised and the second lifting block is lowered, and as a result, the contact piece (142) contracts radially and is released from contact with the core support barrel (20).

[0072] As the contact piece (142) is released from contact with the core support barrel, the core support barrel is restored to its original shape by its own elastic restoring force, as shown in Fig. 6 (b), and the high-temperature tube (12) of the reactor vessel and the discharge tube (22) of the core support barrel (20) are in close contact with each other, so that the gap formed between the reactor vessel and the core support barrel is not formed.

[0073] As such, the present invention has the effect of allowing the core support barrel to be easily installed inside the reactor vessel by gripping the core support barrel and applying force so that the core support barrel is inserted into the reactor vessel while deformed into an elliptical shape.

[0074] In addition, the elliptical core support barrel is separated from the core support barrel after being inserted into the reactor vessel, and is stably mounted to the reactor vessel by the elastic restoring force due to the material of the core support barrel, thereby having the effect of preventing the formation of a gap that was previously formed between the reactor vessel and the core support barrel.

[0076] Although the present invention has been described above with reference to the embodiments illustrated in the drawings, this is merely for the purpose of explaining the invention, and a person skilled in the art to which the present invention pertains will understand that various modifications or equivalent embodiments are possible from the detailed description of the invention.

[0077] Therefore, the true scope of rights of the present invention must be determined by the technical concept of the patent claims. Explanation of the symbols

[0079] 10: Reactor vessel 12: High temperature tube 14: Low temperature tube 20: Core Support Barrel 22: Discharge pipe 100: Reactor core support barrel insertion device 110: Main shaft 115: Screw part 120: Horizontal bar 122: Insertion groove 124: Insertion projection 126: Joint member 130: Vertical bar 140: Connecting member 142: Contact piece 144: First connection 146: Second connection 150: Linkload 160: Lifting / Lowering Block 161: 1st Ascent / Descent Block 163: 2nd Ascent / Descent Block D: Driving means G: Gap M: Drive motor S,S1: Stopper U: Pap unit

Claims

Claim 1 For inserting a core support barrel into the interior of a reactor vessel, a drive motor; and a driving means for fixing and releasing the core support barrel as it is rotated in a forward or reverse direction by the driving motor; wherein the driving means comprises: a main shaft having a long length in the longitudinal direction of the core support barrel, which is connected to the driving motor and rotated by the driving force of the driving motor; a screw part extending from the lower part of the main shaft and having a screw surface formed on its outer circumference, with screw surfaces formed in different directions on the upper and lower parts of the screw part centered around a stopper coupled in the center; a first lifting / lowering block mounted on the upper side of the screw part and moving up or down as the screw part rotates; a second lifting / lowering block mounted on the lower side of the screw part and moving up or down in the opposite direction to the first lifting / lowering block as the screw part rotates; a horizontal bar coupled horizontally to the upper end of the main shaft but configured not to receive the rotational force of the main shaft; a pair of vertical bars linked vertically to both ends of the horizontal bar; and a component linked to the lower end of the vertical bar. A reactor core support barrel insertion device comprising: a connecting member including a contact piece that directly contacts the inner circumferential surface of a core support barrel; and a plurality of link rods, each having both ends linked to the first and second lifting / lowering blocks of the connecting member to connect the connecting member and the first and second lifting / lowering blocks, wherein as the screw portion is rotated in a forward or reverse direction by a driving motor, the contact piece expands outward to fix and deform the core support barrel into an elliptical shape, or contracts inward to release the connection with the core support barrel. Claim 2 delete Claim 3 A reactor core support barrel insertion device according to claim 1, characterized in that a fitting groove is formed on the bottom surface of the horizontal bar for fitting and fixing the upper end of the core support barrel. Claim 4 A reactor core support barrel insertion device according to claim 1, wherein the contact pieces are arranged such that a pair are facing each other and include an outer surface having a predetermined curvature.

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