Reactor internals flow-induced vibration test sensor wire protection cover and installation method

Abstract

The invention provides a reactor internal flow-induced vibration test sensor wire protection cover and an installation method, the sensor wire protection cover is used for sleeving the upper part of a sensor wire leading-out structure above a reactor internal, the sensor wire protection cover is of a sectional structure, and the sensor wire protection cover comprises at least two sections of cover bodies; and the two sections of cover bodies are detachably connected. The protection device can effectively protect a sensor wire led out of a reactor in the process of buckling a top cover of a reactor pressure vessel, the protection device is convenient to disassemble in a reactor top assembly shroud due to the sectional design, and the protection device is simple in structure, convenient to operate and low in cost. The lead-out protection problem of a sensor wire in a reactor internal flow-induced vibration test is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of in-core component flow-induced vibration design analysis and test measurement, and particularly relates to a sensor wire protection cover for in-core component flow-induced vibration test and an installation method thereof. Background Art

[0002] In-core components are important equipment of a nuclear power plant reactor. They are installed inside the reactor pressure vessel, support fuel assemblies, and provide positioning and guidance for control rod drive mechanisms. During the operation of a nuclear power plant, the flow-induced vibration characteristics of in-core components under the impact of reactor coolant are crucial. For "prototype in-core components", generally, in-core component flow-induced vibration tests should be carried out during the hot functional test of the nuclear power plant to measure the flow-induced vibration characteristics of key components of in-core components.

[0003] The wires of sensors for measurement are generally armored wires, and the wires need to be led out of the reactor. Generally, the sensor wires are led out of the reactor through the in-core measurement nozzles on the reactor pressure vessel head. When the reactor pressure vessel head is closed, the sensor wires need to pass through the in-core measurement nozzles on the reactor pressure vessel head. If the wires are not protected during the closing process of the reactor pressure vessel head, it is easy to damage the sensor wires.

[0004] In view of this, the inventors of the present application have designed a sensor wire protection cover for in-core component flow-induced vibration test and an installation method thereof in order to overcome the above technical problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defect that when the reactor pressure vessel head is closed in the prior art, the sensor wires need to pass through the in-core measurement nozzles on the reactor pressure vessel head, and if the wires are not protected during the closing process of the reactor pressure vessel head, it is easy to damage the sensor wires, and to provide a sensor wire protection cover for in-core component flow-induced vibration test and an installation method thereof.

[0006] The present invention solves the above technical problems by the following technical solutions:

[0007] The present invention provides a sensor wire protection cover for in-core component flow-induced vibration test, which is characterized in that the sensor wire protection cover is used to be sleeved on the upper part of the sensor wire leading-out structure above the in-core component, the sensor wire protection cover is a segmented structure, and the sensor wire protection cover includes at least two sections of cover bodies, and the two sections of cover bodies are detachably connected.

[0008] According to one or more embodiments of the present invention, the cover body includes a first cover body and a second cover body; the first cover body is located in the upper section, and the upper end of the first cover body is sealed; the second cover body is located in the lower section, and the lower end of the first cover body is detachably connected to the upper end of the second cover body.

[0009] According to one or more embodiments of the present invention, the upper end of the first cover body has a guiding portion, and the guiding portion is conical.

[0010] According to one or more embodiments of the present invention, an L-shaped rotating groove is provided in the lower part of the first cover body or the upper part of the second cover body, and a plugging portion matching with the L-shaped rotating groove is provided in the upper part of the second cover body or the lower part of the first cover body.

[0011] According to one or more embodiments of the present invention, the L-shaped rotating groove includes an axial plugging section and a circumferential locking section. The axial plugging section extends axially along the sensor wire protection cover to the lower end of the first cover body, and the circumferential locking section communicates with the axial plugging section and extends circumferentially along the sensor wire protection cover; the plugging portion protrudes from the surface of the sensor wire protection cover.

[0012] According to one or more embodiments of the present invention, mutually matching thread structures are provided in the lower part of the first cover body and the upper part of the second cover body.

[0013] According to one or more embodiments of the present invention, the outer diameter of the sensor wire protection cover is 80 mm to 130 mm, the inner diameter is 90 mm to 120 mm, and the wall thickness is about 2 mm to 5 mm.

[0014] According to one or more embodiments of the present invention, the total height of the sensor wire protection cover is 800 mm to 1200 mm.

[0015] According to one or more embodiments of the present invention, a sealing ring is provided on the inner side of the bottom of the sensor wire protection cover.

[0016] According to one or more embodiments of the present invention, a sensor wire leading-out structure is provided in the lower part of the sensor wire protection cover. The sensor wire leading-out structure includes: an outer sleeve, a wire tube, a bottom flange, a top plug assembly and an elastic member; the outer sleeve is arranged in the in-core measurement nozzle of the reactor pressure vessel head; the wire tube is arranged in the outer sleeve, and the wire tube is used for passing through the sensor wire; the bottom flange is fixed at the bottom of the wire tube and is used for connecting with the in-core measurement grid assembly; the top plug assembly is arranged at the top of the outer sleeve and is used for sealing the in-core measurement nozzle; the elastic member is arranged between the top plug assembly and the wire tube.

[0017] The present invention also provides a method for installing a wire protection cover for in-core component flow-induced vibration test sensors. The method is characterized in that the method for installing the wire protection cover for in-core component flow-induced vibration test sensors is used to install the wire protection cover for in-core component flow-induced vibration test sensors as described above. The method for installing the sensor wire protection cover includes the following steps: S1. Vertically sleeved the second cover body on the top of the sensor wire lead-out structure above the in-core component, ensuring that the bottom sealing ring is closely attached to the upper end of the sensor wire lead-out structure; ensuring that the bottom sealing ring is closely attached to the pressure-bearing surface of the nozzle; S2. Align and connect the lower end of the first cover body with the upper end of the second cover body; S3. Check the fastening status of each connection part to ensure that the overall installation of the sensor wire protection cover is stable.

[0018] The positive and progressive effects of the present invention are as follows:

[0019] The wire protection cover for in-core component flow-induced vibration test sensors of the present invention has at least the following advantages:

[0020] The wire protection cover for in-core component flow-induced vibration test sensors and the installation method of the present invention can effectively protect the sensor wires led out from the reactor during the process of covering the reactor pressure vessel head cover. The segmented design facilitates the removal of the protection device in the shroud of the top assembly of the reactor. Its structure is simple and the operation is convenient, solving the problem of leading out and protecting the sensor wires in the in-core component flow-induced vibration test. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other features, properties, and advantages of the present invention will become more apparent from the following description in conjunction with the drawings and embodiments. In the drawings, the same reference numerals always represent the same features, where:

[0022] Figure 1 is an installation schematic diagram of an embodiment of the wire protection cover for in-core component flow-induced vibration test sensors of the present invention.

[0023] Figure 2 is a structural schematic diagram of an embodiment of the wire protection cover for in-core component flow-induced vibration test sensors of the present invention.

[0024] Figure 3 is a disassembly state schematic diagram of an embodiment of the wire protection cover for in-core component flow-induced vibration test sensors of the present invention.

[0025]

REFERENCE NUMERALS

[0026] First cover body 100

[0027] Guide part 110

[0028] Second cover body 200

[0029] L-shaped rotating groove 300

[0030] Axial insertion section 310

[0031] Circumferential locking section 320

[0032] Insertion part 400

[0033] Sealing ring 500

[0034] Sensor wire lead-out structure 600

[0035] Outer sleeve 610

[0036] Wire conduit 620

[0037] Bottom flange 630

[0038] Top plug assembly 640

[0039] Special wire seal 641

[0040] Wire fixing post 642

[0041] Top plug 643

[0042] In-core measurement nozzle 700 Specific implementation manner

[0043] To make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manner of the present invention will be given in conjunction with the accompanying drawings.

[0044] Now, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Now, preferred embodiments of the present invention will be described in detail, and examples thereof are shown in the accompanying drawings. In any possible case, the same reference numerals will be used throughout the drawings to represent the same or similar parts. In addition, although the terms used in the present invention are selected from well-known and commonly used terms, some of the terms mentioned in the specification of the present invention may be selected by the applicant according to his or her judgment, and their detailed meanings are described in the relevant parts of the description herein. In addition, it is required to understand the present invention not only by the actual terms used, but also by the meaning implied by each term. At the same time, for the sake of convenience of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship.

[0045] See Figures 1 - 3 , the present invention provides a sensor wire protection cover for in-core component flow-induced vibration test, the sensor wire protection cover is used to sleeved on the upper part of the sensor wire lead-out structure 600 above the in-core component, the sensor wire protection cover is a segmented structure, and the sensor wire protection cover includes at least two sections of cover bodies, and the two sections of cover bodies are detachably connected.

[0046] Preferably, a rubber ring seal is provided between the two sections of the cover to ensure the seal after the connection of the two end covers.

[0047] Preferably, the overall structure of the sensor wire protection cover is a hollow thin-walled cylinder. The inner space can accommodate all the sensor wires, and the outer diameter can ensure that it can pass through the in-core measurement nozzle 700 of the reactor pressure vessel head.

[0048] The sensor wire protection cover of the in-core structure flow-induced vibration test of the present invention can provide effective protection for the wires when the reactor pressure vessel head is closed.

[0049] The sensor wire protection cover of the in-core structure flow-induced vibration test of the present invention is divided into two sections. The two sections of the cover can be connected or disassembled from the middle to meet the requirement of segmental removal of the cover through the air door or maintenance door on the outside of the top assembly. The sensor wire protection cover of the in-core structure flow-induced vibration test of the present invention can be used to protect the sensor wires led out from the core when the reactor pressure vessel is covered during the hot test.

[0050] It should be noted that after the reactor pressure vessel head is in place, the sensor wire protection cover needs to be removed so that the sensor wires can be connected to the instruments. At this time, the sensor wire protection cover is located inside the shroud of the top assembly, and the upper space of the position of the sensor wire protection cover is limited, only about 600 mm, while the total height of the protection cover is 800 mm - 1200 mm. Therefore, if the sensor wire protection cover is not segmented, the entire length of the sensor wire protection cover cannot be removed as a whole. Designing the sensor wire protection cover as a segmented structure can achieve segmented removal, and the wall thickness of the sensor wire protection cover is as thin as possible to make the weight as light as possible, so that it can be manually removed by manpower.

[0051] In addition to providing protection for the sensor wires during the in-core structure flow-induced vibration test, the sensor wire protection cover can also provide protection for the in-core measurement instrument connectors during the operation of the reactor. Its usage method and process are the same as those for protecting the sensor wires. Moreover, during refueling, the in-core structure will be placed entirely in the refueling water. At this time, the sealing function of the sensor wire protection cover can also prevent the water in the refueling pool from entering and prevent the damage of the in-core measurement instrument connectors.

[0052] See Figure 1 and Figure 2 As a preferred embodiment of the sensor wire protection cover of the in-core structure flow-induced vibration test of the present invention, the cover includes a first cover 100 and a second cover 200;

[0053] The first cover 100 is located in the upper section, and the upper end of the first cover 100 is sealed;

[0054] The second cover 200 is located in the lower section, and the lower end of the first cover 100 is detachably connected to the upper end of the second cover 200.

[0055] It should be noted that the sensor wire protection cover of the present invention is a hollow cylindrical structure, and the form of detachable connection between the lower end of the first cover body 100 and the upper end of the second cover body 200 can adopt connection forms such as threaded connection and flange connection.

[0056] See Figure 1 and Figure 2 , as a preferred embodiment of the sensor wire protection cover for the in-core component flow-induced vibration test of the present invention, the upper end of the first cover body 100 has a guiding portion 110, and the guiding portion 110 is conical.

[0057] It should be noted that the top of the sensor wire protection cover of the present invention is a conical guiding portion 110, and the outer diameter of the sensor wire protection cover of the present invention can ensure that it can pass through the in-core measurement nozzle 700 of the reactor pressure vessel head. During the process of covering the reactor pressure vessel head, the conical structure at the top of the protection cover is used for guiding.

[0058] The guiding portion 110 at the top of the first cover body 100 is a conical structure in the shape of a bullet head, and the movement track of covering the reactor pressure vessel head is guided through this conical structure.

[0059] See Figure 2 , as a preferred embodiment of the sensor wire protection cover for the in-core component flow-induced vibration test of the present invention, an L-shaped rotating groove 300 is provided in the lower part of the first cover body 100 or the upper part of the second cover body 200, and a plugging portion 400 that cooperates with the L-shaped rotating groove 300 is provided in the upper part of the second cover body 200 or the lower part of the first cover body 100.

[0060] See Figure 2 , as a preferred embodiment of the sensor wire protection cover for the in-core component flow-induced vibration test of the present invention, the L-shaped rotating groove 300 includes an axial plugging section 310 and a circumferential locking section 320. The axial plugging section 310 extends axially along the sensor wire protection cover to the lower end of the first cover body 100, and the circumferential locking section 320 communicates with the axial plugging section 310 and extends circumferentially along the sensor wire protection cover; the plugging portion 400 protrudes from the surface of the sensor wire protection cover.

[0061] During connection, the plugging portion 400 is inserted along the axial plugging section 310, and after rotating a certain angle, the plugging portion 400 is snapped into the circumferential locking section 320 to achieve locking; during disassembly, it is pulled out axially after rotating in the reverse direction by a certain angle.

[0062] Preferably, the circumferential locking section 320 extends 90° circumferentially.

[0063] See Figure 1 and Figure 2, as a preferred embodiment of the sensor wire protection cover for the in-core component flow-induced vibration test of the present invention, a threaded structure that can cooperate with each other is provided at the lower part of the first cover body 100 and the upper part of the second cover body 200.

[0064] Preferably, the first cover body 100 and the second cover body 200 can also be connected by a flange. Both the first cover body 100 and the second cover body 200 are provided with flange connection surfaces. When connecting, the flange connection surfaces of the first cover body 100 and the second cover body 200 can be aligned and fixed together with connecting parts such as bolts; when disassembling, remove the connecting parts and disassemble and separate the first cover body 100 and the second cover body 200.

[0065] As a preferred embodiment of the sensor wire protection cover for the in-core component flow-induced vibration test of the present invention, the outer diameter of the sensor wire protection cover is 80 mm to 130 mm, and the inner diameter is 90 mm

[0066] to 120 mm, and the wall thickness is about 2 mm to 5 mm.

[0067] As a preferred embodiment of the sensor wire protection cover for the in-core component flow-induced vibration test of the present invention, the total height of the sensor wire protection cover is 800 mm to 1200 mm.

[0068] See Figure 2 , as a preferred embodiment of the sensor wire protection cover for the in-core component flow-induced vibration test of the present invention, a sealing ring 500 is provided inside the bottom of the sensor wire protection cover.

[0069] When the sensor wire protection cover for the in-core component flow-induced vibration test of the present invention is in use, it is installed on the top of the in-core component. The inner side of the bottom of the protection cover is sleeved on the outer side of the top of the wire lead-out structure of the in-core component. A sealing ring 500 is provided inside the bottom of the protection cover, which can achieve the sealing of the inside of the protection cover after installation.

[0070] As described above, the sensor wire protection cover for the in-core component flow-induced vibration test of the present invention can effectively protect the sensor wires led out from the reactor during the process of covering the reactor pressure vessel head cover. The segmented design facilitates the removal of the protection device inside the shroud of the top assembly of the reactor. Its structure is simple and the operation is convenient, solving the problem of leading out and protecting the sensor wires in the in-core component flow-induced vibration test.

[0071] See Figure 1 , as a preferred embodiment of the sensor wire protection cover for the in-core component flow-induced vibration test of the present invention, a sensor wire lead-out structure 600 is provided at the lower part of the sensor wire protection cover. The sensor wire lead-out structure 600 includes: an outer sleeve 610, a wire tube 620, a bottom flange 630, a top plug assembly 640 and an elastic member;

[0072] The outer sleeve 610 is arranged inside the in-core measurement nozzle 700 of the reactor pressure vessel head cover;

[0073] The conduit 620 is arranged inside the outer sleeve 610, and the conduit 620 is used for threading the sensor wires;

[0074] The bottom flange 630 is fixed at the bottom of the conduit 620 and is used for connecting with the in-core measurement grid assembly;

[0075] The top plug assembly 640 is arranged at the top of the outer sleeve 610 and is used for sealing the in-core measurement nozzle 700;

[0076] The elastic member is arranged between the top plug assembly 640 and the conduit 620.

[0077] It should be noted that by arranging a plurality of conduits 620 inside the sensor wire lead-out structure 600, the sensor wires can be guided upward and protected. The sensor wire lead-out structure 600 passes through the reactor pressure vessel head cover to lead the wires out of the reactor. The top of the sensor wire lead-out structure 600 is matched with the sealing structure of the reactor measurement nozzle to achieve the sealing of the reactor measurement nozzle. The elastic member can realize the height adjustment of the lead-out structure to adapt to the load generated by the change of operating temperature and flow-induced vibration.

[0078] In addition, when the reactor is operating at full power, the temperature is about 300 °C, and since the materials of the reactor pressure vessel and the in-core components are different, there is a difference in thermal expansion coefficients, which will cause relative displacement between the reactor pressure vessel and the in-core components. Since the lead-out structure is fixed to the pressure vessel and the in-core components respectively, an elastic member is arranged in the lead-out structure, which can expand and contract to adapt to the relative displacement between the components generated by the temperature difference during reactor operation and the influence of flow-induced vibration.

[0079] Preferably, the outer side of the sensor wire lead-out structure 600 is the outer sleeve 610, and the outer diameter is about φ80 mm to 150 mm, which can pass through the in-core measurement nozzle 700 of the reactor pressure vessel head cover.

[0080] Preferably, in the sensor wire lead-out structure 600, there are multiple conduits 620, and the multiple conduits 620 are circumferentially evenly distributed, and a conduit support structure is fixedly arranged outside the conduits 620.

[0081] Preferably, the number of inner conduits is determined according to the number of wires, generally 4 to 8, and a circumferentially even distribution design is adopted.

[0082] Preferably, in the sensor wire lead-out structure 600, the conduit support structure includes a plurality of guide pieces, and the guide pieces are arranged at equal intervals along the axial direction of the conduit 620 and are fixed to the outer circumference of the conduit 620.

[0083] Preferably, the guiding piece is welded to the outer periphery of the wire conduit 620 to provide radial support for the wire conduit 620.

[0084] Preferably, in the sensor wire lead-out structure 600, the elastic member is an adjusting spring. The adjusting spring is arranged inside the outer sleeve 610. One end of the adjusting spring abuts against the upper end face of the wire conduit support structure, and the other end of the adjusting spring abuts against the lower end face of the top plug assembly 640.

[0085] Preferably, one end of the adjusting spring abuts against the upper end face of the uppermost guiding piece, and the other end of the adjusting spring abuts against the lower end face of the top plug 643.

[0086] It should be noted that the sensor wire lead-out structure 600 for the in-core component flow-induced vibration test of the present invention is internally provided with an adjusting spring, which can be telescoped to adapt to the relative displacement change and vibration in the reactor. The adjusting spring can realize the height adjustment of the lead-out structure and adapt to the operating temperature change and the load generated by flow-induced vibration.

[0087] Since the temperature is about 300 °C during the full-power operation of the reactor, and the materials of the reactor pressure vessel and the in-core components are different, there is a difference in the coefficient of thermal expansion, which will cause relative displacement between the reactor pressure vessel and the in-core components. Since the lead-out structure is fixed to the pressure vessel and the in-core components respectively, an adjusting spring is provided in the lead-out structure, which can be telescoped to adapt to the relative displacement between components generated by the temperature difference during the reactor operation and the influence of flow-induced vibration.

[0088] Preferably, in the sensor wire lead-out structure 600, the top plug assembly 640 includes a top plug 643 and a sealing nut;

[0089] The sealing nut is sleeved outside the top plug 643. The sealing nut is threadedly connected to the top of the in-core measuring nozzle 700 to fix the top plug 643 to the top of the in-core measuring nozzle 700.

[0090] It should be noted that a special wire sealing structure is provided at the top of the lead-out structure to realize the sealing of the lead-out wire.

[0091] Preferably, in the sensor wire lead-out structure 600, the top plug assembly 640 further includes a graphite sealing ring bracket assembly and a pressing cylinder. The graphite sealing ring bracket assembly is arranged between the top plug 643 and the in-core measuring nozzle 700. The upper part of the pressing cylinder is located between the top plug 643 and the sealing nut. The lower part of the pressing cylinder has a groove, and the upper part of the graphite sealing ring bracket assembly is inserted into the groove of the pressing cylinder.

[0092] It should be noted that the upper part of the graphite sealing ring bracket assembly is located in the groove of the pressing cylinder. The groove of the pressing cylinder presses the graphite sealing ring bracket assembly from both sides. The graphite sealing ring bracket assembly includes a graphite sealing ring. By tightening the sealing nut, the graphite sealing ring bracket assembly presses the top plug 643 to achieve sealing.

[0093] The top design of the sensor wire lead-out structure 600 is cooperated with the sealing nut, the graphite sealing ring bracket assembly, and the top plug 643 to achieve graphite sealing. The advantage of graphite sealing is excellent high-temperature resistance and good chemical stability.

[0094] Preferably, in the sensor wire lead-out structure 600, a positioning groove is provided at the bottom of the top plug 643, and the wire tube 620 moves up and down in the positioning groove.

[0095] Preferably, the diameter of the positioning groove is slightly larger than the outer diameter of the wire tube 620, so that the wire tube 620 can move up and down in the positioning groove. Cooperating with the elastic member, the height adjustment of the lead-out structure can be realized to adapt to the changes in operating temperature and the loads generated by flow-induced vibration.

[0096] Preferably, in the sensor wire lead-out structure 600, a wire special seal 641 and a wire fixing column 642 are provided on the upper part of the top plug 643.

[0097] Preferably, a wire special seal interface is provided at the top of the top plug 643. The wire special seal 641 can be connected through the wire special seal interface to achieve the sealing of the wire. Preferably, the wire special seal interface can be a threaded hole provided at the top of the top plug 643 for installing the wire special seal structure; another threaded hole is provided in the middle of the top plug 643 for installing the wire fixing column 642 outside the reactor.

[0098] Preferably, in the sensor wire lead-out structure 600, the bottom flange 630 is fixed to the lower part of the wire tube support structure.

[0099] Preferably, the bottom flange 630 is fixedly connected to the lowermost guide piece.

[0100] Preferably, in the sensor wire lead-out structure 600, the bottom flange 630 includes a fixing screw and an adjusting screw; the bottom flange 630 is connected to the in-core measurement grid assembly through the fixing screw; the bottom flange 630 adjusts the installation levelness and height of the sensor wire lead-out structure 600 for the in-core component flow-induced vibration test of the present invention through the adjusting screw.

[0101] It should be noted that the installation levelness and height are adjusted through the adjusting screw to ensure the cooperation and sealing with the in-core measurement nozzle 700 of the reactor vessel head.

[0102] The sensor wire lead-out structure 600 realizes fine adjustment of the height position and connection with the in-core measurement grid assembly through adjusting screws and fixing screws.

[0103] Preferably, the sensor wire lead-out structure 600 is connected to the threaded holes of the top flange of the in-core measurement grid assembly through 3 fixing screws, and by adjusting the screwing depth of the 3 adjusting screws, the levelness and height of the sensor wire lead-out structure 600 are adjusted to ensure the centering and reliable sealing of the lead-out structure with the in-core measurement nozzle 700.

[0104] As described above, the sensor wire lead-out structure 600 for the in-core component flow-induced vibration test can be used for the structure installed on the top of the in-core components during the hot test of the flow-induced vibration test, can provide guidance and protection for the sensor wires, and lead out of the reactor through the in-core measurement nozzle 700 of the reactor pressure vessel head, and can effectively seal the in-core measurement nozzle 700.

[0105] The present invention also provides a method for installing the sensor wire protection cover for the in-core component flow-induced vibration test. The method for installing the sensor wire protection cover for the in-core component flow-induced vibration test is used to install the sensor wire protection cover for the in-core component flow-induced vibration test as described above. The method for installing the sensor wire protection cover includes the following steps:

[0106] Step S1: Vertically sleeved the second cover body 200 on the top of the sensor wire lead-out structure 600 above the in-core components, and ensure that the bottom sealing ring 500 is closely attached to the upper end of the sensor wire lead-out structure 600;

[0107] Step S2: Align and connect the lower end of the first cover body 100 with the upper end of the second cover body 200;

[0108] Step S3: Check the fastening state of each connection part to ensure the overall installation of the sensor wire protection cover is stable.

[0109] In summary, the sensor wire protection cover and the installation method for the in-core component flow-induced vibration test of the present invention can effectively protect the sensor wires led out from the reactor during the process of covering the reactor pressure vessel head, and the segmented design is convenient for removing the protection device in the shroud of the top assembly of the reactor. Its structure is simple and the operation is convenient, which solves the problem of leading out and protecting the sensor wires in the in-core component flow-induced vibration test.

[0110] Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that these are only examples, and the protection scope of the present invention is defined by the appended claims. Without departing from the principles and essence of the present invention, those skilled in the art can make various changes or modifications to these embodiments, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A sensor wire protection cover for in-core component flow-induced vibration test, characterized in that, The sensor wire protection cover is used to sleeved on the upper part of the sensor wire leading-out structure above the in-vessel component. The sensor wire protection cover is a segmented structure, and the sensor wire protection cover includes at least two sections of cover bodies, and the two sections of cover bodies are detachably connected.

2. The in-core structure flow-induced vibration test sensor wire protection cover according to claim 1, characterized in that, The cover body includes a first cover body and a second cover body; The first cover body is located in the upper section, and the upper end of the first cover body is sealed; The second cover body is located in the lower section, and the lower end of the first cover body is detachably connected to the upper end of the second cover body.

3. The wire protection cover for the in-core component fluid-induced vibration test sensor according to claim 2, characterized in that, The upper end of the first cover body has a guiding part, and the guiding part is conical.

4. The wire protection cover for the in-core component flow-induced vibration test sensor according to claim 2, characterized in that, An L-shaped rotating groove is provided in the lower part of the first cover body or the upper part of the second cover body, and a plugging part matching with the L-shaped rotating groove is provided in the upper part of the second cover body or the lower part of the first cover body.

5. The wire protection cover for the in-core component flow-induced vibration test sensor according to claim 4, characterized in that, The L-shaped rotating groove includes an axial plugging section and a circumferential locking section. The axial plugging section extends along the axis of the sensor wire protection cover to the lower end of the first cover body, and the circumferential locking section communicates with the axial plugging section and extends along the circumference of the sensor wire protection cover; the plugging part protrudes from the surface of the sensor wire protection cover.

6. The in-core component flow-induced vibration test sensor wire protection cover according to claim 2, characterized in that, Thread structures that can cooperate with each other are provided in the lower part of the first cover body and the upper part of the second cover body.

7. The wire protection cover for the in-core component fluid-induced vibration test sensor according to claim 1, wherein The outer diameter of the sensor wire protection cover is 80 mm to 130 mm, the inner diameter is 90 mm to 120 mm, and the wall thickness is about 2 mm to 5 mm.

8. The in-core component flow-induced vibration test sensor wire protection cover according to claim 1, characterized in that, The total height of the sensor wire protection cover is 800 mm to 1200 mm.

9. The in-core component flow-induced vibration test sensor wire protection cover according to claim 1, characterized in that, A sealing ring is provided on the inner side of the bottom of the sensor wire protection cover.

10. The wire protection cover for the in-core component flow-induced vibration test sensor according to claim 1, characterized in that, A sensor wire leading-out structure is provided in the lower part of the sensor wire protection cover. The sensor wire leading-out structure includes: an outer sleeve, a wire pipe, a bottom flange, a top plug assembly and an elastic member; The outer sleeve is arranged in the in-core measurement nozzle of the reactor pressure vessel head; The wire pipe is arranged in the outer sleeve, and the wire pipe is used for threading the sensor wire; The bottom flange is fixed at the bottom of the wire pipe and is used for connecting with the in-core measurement grid assembly; The top plug assembly is arranged at the top of the outer sleeve and is used for sealing the in-core measurement nozzle; The elastic member is arranged between the top plug assembly and the wire pipe.

11. A method for installing a sensor wire protection cover for in-core component flow-induced vibration test, characterized in that, The installation method of the in-vessel component flow-induced vibration test sensor wire protection cover is used to install the in-vessel component flow-induced vibration test sensor wire protection cover according to any one of claims 1-10. The sensor wire protection cover installation method includes the following steps: S1. Vertically sleeve the second cover body on the top of the sensor wire leading-out structure above the in-vessel component, and ensure that the bottom sealing ring is closely attached to the upper end of the sensor wire leading-out structure; S2. Align and connect the lower end of the first cover body with the upper end of the second cover body; S3. Check the fastening state of each connection part to ensure that the overall installation of the sensor wire protection cover is stable.

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