Sensor wire leading-out structure for flow-induced vibration test of reactor internals and installation method of sensor wire leading-out structure

Abstract

The invention provides a sensor wire leading-out structure for a flow-induced vibration test of reactor internals and an installation method, the sensor wire leading-out structure is installed at the top of an in-reactor measurement grillwork assembly of the reactor internals, and the sensor wire leading-out structure comprises an outer sleeve, a wire conduit, a bottom flange, a top end plug assembly and an elastic piece; the outer sleeve is arranged in an in-reactor measurement connecting pipe of a top cover of a reactor pressure vessel; the wire conduit is arranged in the outer sleeve and is used for penetrating through a sensor wire; the bottom flange is fixed at the bottom of the wire conduit and is used for being connected with an in-pile measuring grillwork assembly; the top plug assembly is arranged at the top of the outer sleeve; the elastic piece is arranged between the top end plug assembly and the wire conduit. Effective protection and leading-out of the in-reactor sensor wire can be realized, possible temperature difference change and vibration load influence during reactor operation are considered, effective sealing of the in-reactor measuring conduit and the sensor wire of the reactor pressure vessel can be ensured, the structure is simple, and installation is convenient.

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 lead-out structure and installation method for in-core component flow-induced vibration tests. Background Art

[0002] In-core components are important equipment in a nuclear power plant reactor. They are installed inside the reactor pressure vessel, support the fuel assembly, and provide positioning and guidance for the control rod drive mechanism. 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 and reliably sealed to ensure the effective measurement of in-core component flow-induced vibration during the hot test of the nuclear power plant. Generally, the sensor wires are led out of the reactor through the in-core measurement nozzles on the reactor pressure vessel cover, but the sealing performance of the traditional wire lead-out structure is insufficient, and the prior art lacks the design of sensor wire lead-out structures.

[0004] In view of this, the inventors of the present application have designed a sensor wire lead-out structure and installation method for in-core component flow-induced vibration tests 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 defects that the sealing performance of the traditional wire lead-out structure is insufficient in the prior art and the prior art lacks the design of sensor wire lead-out structures, and to provide a sensor wire lead-out structure and installation method for in-core component flow-induced vibration tests.

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

[0007] The present invention provides a sensor wire lead-out structure for in-core component flow-induced vibration tests, which is characterized in that the sensor wire lead-out structure is installed on the top of the in-core measurement grid assembly of the in-core component, and the sensor wire lead-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 cover; the wire tube is arranged inside the outer sleeve, and the wire tube is used for threading 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; the elastic member is arranged between the top plug assembly and the wire tube.

[0008] According to one or more embodiments of the present invention, there are a plurality of conduit pipes, and the plurality of conduit pipes are circumferentially evenly distributed. A conduit pipe support structure is fixedly arranged outside the conduit pipes.

[0009] According to one or more embodiments of the present invention, the conduit pipe support structure includes a plurality of guide pieces, the guide pieces are arranged at equal intervals along the axial direction of the conduit pipe, and are fixed to the outer periphery of the conduit pipe.

[0010] According to one or more embodiments of the present invention, the elastic member is an adjusting spring, the adjusting spring is arranged inside the outer sleeve, one end of the adjusting spring abuts against the upper end face of the conduit pipe support structure, and the other end of the adjusting spring abuts against the lower end face of the top plug assembly.

[0011] According to one or more embodiments of the present invention, the top plug assembly includes a top plug and a sealing nut; the sealing nut is sleeved outside the top plug, and the sealing nut is threadedly connected to the top of the in-pile measurement nozzle, and the top plug is fixed to the top of the in-pile measurement nozzle.

[0012] According to one or more embodiments of the present invention, the top plug assembly further includes a graphite sealing ring bracket assembly and a pressing cylinder. The graphite sealing ring bracket assembly is arranged between the top plug and the in-pile measurement nozzle. The upper part of the pressing cylinder is located between the top plug 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.

[0013] According to one or more embodiments of the present invention, a positioning groove is provided at the bottom of the top plug, and the conduit pipe moves up and down in the positioning groove.

[0014] According to one or more embodiments of the present invention, a wire special sealing member and a wire fixing column are provided at the upper part of the top plug.

[0015] According to one or more embodiments of the present invention, the bottom flange is fixed to the lower part of the conduit pipe support structure.

[0016] According to one or more embodiments of the present invention, the bottom flange includes fixing screws and adjusting screws; the bottom flange is connected to the in-pile measurement grid assembly through the fixing screws; the bottom flange adjusts the installation levelness and height of the sensor wire lead-out structure for the in-pile component flow-induced vibration test through the adjusting screws.

[0017] The present invention also provides an installation method for a sensor wire lead-out structure used in the in-core component flow-induced vibration test. The installation method for the sensor wire lead-out structure used in the in-core component flow-induced vibration test is used to install the sensor wire lead-out structure for the in-core component flow-induced vibration test as described above. The installation method includes the following steps: S1. Adjust the installation levelness and height of the sensor wire lead-out structure through the adjusting screws on the bottom flange; S2. After the levelness and height of the sensor wire lead-out structure meet the requirements, tighten the fixing screws to connect the sensor wire lead-out structure with the in-core measurement grid assembly of the in-core component; S3. Pass the sensor wire through the wire tube, install the special wire seal, and tighten the sealing nut to complete the sealing of the sensor wire.

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

[0019] The sensor wire lead-out structure and the installation method for the in-core component flow-induced vibration test of the present invention have the following advantages:

[0020] It can effectively protect and lead out the in-core sensor wire, and takes into account the possible temperature difference changes and vibration load effects during reactor operation, which can ensure the effective sealing of the in-core measurement conduit and the sensor wire of the reactor pressure vessel. The structure is simple and the installation is convenient, solving the problem of leading out the sensor wire in the in-core component flow-induced vibration test. Description of the Drawings

[0021] The above-mentioned and other features, properties and advantages of the present invention will become more obvious through 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 sensor wire lead-out structure for the in-core component flow-induced vibration test of the present invention.

[0023] Figure 2 is a structural schematic diagram of an embodiment of the sensor wire lead-out structure for the in-core component flow-induced vibration test of the present invention.

[0024] Figure 3 is a structural schematic diagram of the bottom flange in an embodiment of the sensor wire lead-out structure for the in-core component flow-induced vibration test of the present invention.

[0025] Figure 4 is a partial structural schematic diagram of an embodiment of the sensor wire lead-out structure for the in-core component flow-induced vibration test of the present invention.

[0026] Figure 5 is a schematic diagram of the up and down movement of the internal conduit in the positioning groove in an embodiment of the sensor wire lead-out structure for the in-core component flow-induced vibration test of the present invention.

[0027]

Reference Signs

[0028] Outer sleeve 100

[0029] Conduit 200

[0030] Conduit support structure 210

[0031] Bottom flange 300

[0032] Fixing screw 310

[0033] Adjusting screw 320

[0034] Top plug assembly 400

[0035] Top plug 410

[0036] Positioning groove 411

[0037] Sealing nut 420

[0038] Graphite sealing ring bracket assembly 430

[0039] Compression cylinder 431

[0040] Special sealing part for wire 440

[0041] Interface of special sealing part for wire 441

[0042] Elastic part 500

[0043] In-core measurement nozzle 600

[0044] Wire fixing post 700 Detailed implementation manners

[0045] To make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manners of the present invention is provided in conjunction with the accompanying drawings.

[0046] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Preferred embodiments of the present invention will now be described in detail, and examples thereof are shown in the drawings. Whenever possible, 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 through the actual terms used, but also through 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 drawings are not drawn in actual proportional relationship.

[0047] Reference Figures 1 to 5 ,the present invention provides a sensor wire lead-out structure for in-core component flow-induced vibration test, which is installed at the top of the in-core measurement grid assembly of the in-core component. The sensor wire lead-out structure includes: an outer sleeve 100, a wire tube 200, a bottom flange 300, a top plug assembly 400 and an elastic member 500; the outer sleeve 100 is arranged in the in-core measurement nozzle 600 of the reactor pressure vessel head; the wire tube 200 is arranged inside the outer sleeve 100, and the wire tube 200 is used for threading the sensor wire; the bottom flange 300 is fixed at the bottom of the wire tube 200 and is used for connecting with the in-core measurement grid assembly; the top plug assembly 400 is arranged at the top of the outer sleeve 100; the elastic member 500 is arranged between the top plug assembly 400 and the wire tube 200.

[0048] By arranging a plurality of wire tubes 200 in the sensor wire lead-out structure, the present invention can guide the sensor wire upward and provide protection.

[0049] The sensor wire lead-out structure passes through the pressure vessel head to lead the wire out of the reactor.

[0050] The top of the sensor wire lead-out structure is matched with the sealing structure of the reactor pressure vessel in-core measurement nozzle to realize the sealing of the in-core measurement nozzle.

[0051] The elastic member 500 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.

[0052] In addition, when the reactor is operating at full power, the temperature is about 300 °C, and the materials of the reactor pressure vessel and the in-core component are different, there is a difference in thermal expansion coefficient, which will cause relative displacement between the reactor pressure vessel and the in-core component. Since the lead-out structure is fixed to the pressure vessel and the in-core component respectively, the elastic member 500 is arranged in the lead-out structure, which can realize expansion and contraction to adapt to the relative displacement between components caused by the temperature difference during reactor operation and the influence of flow-induced vibration.

[0053] Preferably, the outer side of the sensor wire lead-out structure for in-core component flow-induced vibration test of the present invention is the outer sleeve 100, with an outer diameter of about φ80 - 150 mm, which can pass through the in-core measurement nozzle 600 of the reactor pressure vessel head.

[0054] Reference Figure 1 and Figure 2 ,as a preferred embodiment of the sensor wire lead-out structure for in-core component flow-induced vibration test of the present invention, there are multiple wire tubes 200, and the multiple wire tubes 200 are circumferentially distributed evenly, and a wire tube support structure 210 is fixedly arranged outside the wire tubes 200.

[0055] Preferably, the number of inner conduits is determined according to the number of wires, generally 4 - 8, and a circumferentially even distribution design is adopted.

[0056] Reference Figure 1 and Figure 2 As a preferred embodiment of the sensor wire lead-out structure for the in-core component flow-induced vibration test of the present invention, the wire tube support structure 210 includes a plurality of guide pieces, which are arranged at equal intervals along the axial direction of the wire tube 200 and are fixed to the outer periphery of the wire tube 200.

[0057] Preferably, the guide pieces are welded to the outer periphery of the wire tube 200 to provide radial support for the wire tube 200.

[0058] Reference Figure 2 and Figure 4 As a preferred embodiment of the sensor wire lead-out structure for the in-core component flow-induced vibration test of the present invention, the elastic member 500 is an adjusting spring, the adjusting spring is arranged inside the outer sleeve 100, one end of the adjusting spring abuts against the upper end surface of the wire tube support structure 210, and the other end of the adjusting spring abuts against the lower end surface of the top plug assembly 400.

[0059] Preferably, one end of the adjusting spring abuts against the upper end surface of the uppermost guide piece, and the other end of the adjusting spring abuts against the lower end surface of the top plug 410.

[0060] It should be noted that the sensor wire lead-out structure 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 operation temperature change and the load generated by the flow-induced vibration.

[0061] 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 thermal expansion coefficient, which will cause the 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, the adjusting spring is provided in the lead-out structure, which can be telescoped to adapt to the relative displacement between the components caused by the temperature difference during the reactor operation and the influence of the flow-induced vibration.

[0062] Reference Figure 1 and Figure 4 As a preferred embodiment of the sensor wire lead-out structure for the in-core component flow-induced vibration test of the present invention, the top plug assembly 400 includes a top plug 410 and a sealing nut 420;

[0063] The sealing nut 420 is sleeved outside the top plug 410, and the sealing nut 420 is threadedly connected to the top of the in-core measuring nozzle 600 to fix the top plug 410 to the top of the in-core measuring nozzle 600.

[0064] 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.

[0065] Reference Figure 1 and Figure 4 As a preferred embodiment of the sensor wire lead-out structure for flow-induced vibration test of in-pile components of the present invention, the top plug assembly 400 also includes a graphite sealing ring bracket assembly 430 and a clamping cylinder 431. The graphite sealing ring bracket assembly 430 is arranged between the top plug 410 and the in-pile measurement connecting pipe 600. The upper part of the clamping cylinder 431 is located between the top plug 410 and the sealing nut 420. The lower part of the clamping cylinder 431 has a groove. The upper part of the graphite sealing ring bracket assembly 430 is inserted into the groove of the clamping cylinder 431.

[0066] It should be noted that the upper part of the graphite sealing ring bracket assembly 430 is located in the groove of the compression cylinder 431, and the groove of the compression cylinder 431 compresses the graphite sealing ring bracket assembly 430 from both sides, and the graphite sealing ring bracket assembly 430 includes a graphite sealing ring. By tightening the sealing nut 420, the top plug 410 is compressed by the graphite sealing ring bracket assembly 430 to achieve sealing. The top design of the sensor wire lead-out structure of the present invention is achieved through the cooperation of the sealing nut 420, the graphite sealing ring bracket assembly 430, and the top plug 410 to achieve graphite sealing. The advantages of graphite sealing are excellent high temperature resistance and good chemical stability.

[0067] Reference Figure 5 As a preferred embodiment of the sensor wire lead-out structure for flow-induced vibration test of in-pile components of the present invention, a positioning groove 411 is provided at the bottom of the top plug 410, and the wire tube 200 moves up and down in the positioning groove 411.

[0068] Figure 5 In the embodiment of FIG. 4 , the direction of the arrow is the direction in which the wire tube 200 moves up and down in the positioning groove 411 .

[0069] Preferably, the diameter of the positioning groove 411 is slightly larger than the outer diameter of the wire tube 200, so that the wire tube 200 can move up and down in the positioning groove 411. The elastic member 500 can adjust the height of the lead-out structure to adapt to the load generated by the operating temperature change and flow-induced vibration.

[0070] Reference Figure 1 and Figure 4 As a preferred embodiment of the sensor wire lead-out structure for flow-induced vibration test of in-core components of the present invention, a wire-specific seal 440 and a wire fixing column 700 are provided on the upper portion of the top end plug 410 .

[0071] Preferably, a wire-specific sealing member interface 441 is provided at the top of the top end plug 410, and the wire-specific sealing member interface 441 can be connected to the wire-specific sealing member 440 to achieve sealing of the wire.

[0072] Preferably, the dedicated wire seal interface 441 can be a threaded hole provided at the top of the top plug 410 for installing the dedicated wire seal structure; another threaded hole is provided in the middle of the top plug 410 for installing the in-core wire fixing column 700.

[0073] Referring to Figure 2 , as a preferred embodiment of the sensor wire lead-out structure for the in-core component flow-induced vibration test of the present invention, the bottom flange 300 is fixed to the lower part of the wire tube support structure 210.

[0074] Preferably, the bottom flange 300 is fixedly connected to the lowermost guiding piece.

[0075] Referring to Figure 2 , as a preferred embodiment of the sensor wire lead-out structure for the in-core component flow-induced vibration test of the present invention, the bottom flange 300 includes a fixing screw 310 and an adjusting screw 320; the bottom flange 300 is connected to the in-core measurement grid assembly through the fixing screw 310; the bottom flange 300 adjusts the installation levelness and height of the sensor wire lead-out structure for the in-core component flow-induced vibration test of the present invention through the adjusting screw 320.

[0076] It should be noted that the installation levelness and height are adjusted through the adjusting screw 320 to ensure the fit and seal with the in-core measurement nozzle 600 of the reactor pressure vessel head.

[0077] The sensor wire lead-out structure for the in-core component flow-induced vibration test of the present invention realizes fine adjustment of the height position and connection with the in-core measurement grid assembly through the adjusting screw 320 and the fixing screw 310.

[0078] Preferably, the sensor wire lead-out structure for the in-core component flow-induced vibration test of the present invention is connected to the threaded holes of the top flange of the in-core measurement grid assembly through 3 fixing screws 310, and the levelness and height of the sensor wire lead-out structure are adjusted by adjusting the screwing depth of the 3 adjusting screws 320 to ensure the centering and reliable seal of the lead-out structure with the in-core measurement nozzle 600.

[0079] As described above, the sensor wire lead-out structure for the in-core component flow-induced vibration test of the present invention is a structure installed on the top of the in-core components during the hot test of the flow-induced vibration test, which can provide guidance and protection for the sensor wires, lead out the reactor through the in-core measurement nozzle 600 of the reactor pressure vessel head, and can effectively seal the in-core measurement nozzle 600.

[0080] The present invention also provides a method for installing a sensor wire lead-out structure for in-core component flow-induced vibration tests, characterized in that the method for installing the sensor wire lead-out structure for in-core component flow-induced vibration tests is used to install the sensor wire lead-out structure for in-core component flow-induced vibration tests as described above, and the installation method includes the following steps:

[0081] Step S1: Adjust the installation levelness and height of the sensor wire lead-out structure through the adjusting screws 320 on the bottom flange 300;

[0082] Step S2: After the levelness and height of the sensor wire lead-out structure meet the requirements, tighten the fixing screws 310 to connect the sensor wire lead-out structure with the in-core measurement grid assembly of the in-core component;

[0083] Step S3: Pass the sensor wire through the wire tube 200, install the special wire seal 440, and tighten the seal nut 420 to complete the sealing of the sensor wire.

[0084] In summary, the sensor wire lead-out structure and installation method for in-core component flow-induced vibration tests of the present invention can effectively protect and lead out the in-core sensor wires, and consider the possible temperature difference changes and vibration load effects during reactor operation, which can ensure the effective sealing of the in-core measurement ducts and sensor wires of the reactor pressure vessel. The structure is simple and the installation is convenient, solving the problem of leading out the sensor wires in in-core component flow-induced vibration tests.

[0085] 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 lead-out structure for in-core component flow-induced vibration test, characterized in that The sensor wire lead-out structure is installed on the top of the in-core measurement grid assembly of the in-core component. The sensor wire lead-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 threading 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; The elastic member is arranged between the top plug assembly and the wire tube.

2. The sensor wire lead-out structure for in-core component flow-induced vibration test according to claim 1, characterized in that, There are multiple wire tubes, and the multiple wire tubes are circumferentially evenly distributed. A wire tube support structure is fixedly arranged outside the wire tubes.

3. The wire leading-out structure of the sensor for the in-core component flow-induced vibration test according to claim 2, wherein The wire tube support structure includes multiple guide pieces, and the guide pieces are arranged at equal intervals along the axial direction of the wire tube and are fixed to the outer periphery of the wire tube.

4. The wire lead-out structure for the in-core component flow-induced vibration test sensor according to claim 2, characterized in that The elastic member is an adjusting spring. The adjusting spring is arranged in the outer sleeve. One end of the adjusting spring abuts against the upper end face of the wire tube support structure, and the other end of the adjusting spring abuts against the lower end face of the top plug assembly.

5. The wire lead-out structure for the sensor used in the in-core component flow-induced vibration test according to claim 1, characterized in that, The top plug assembly includes a top plug and a sealing nut; The sealing nut is sleeved outside the top plug, and the sealing nut is threadedly connected to the top of the in-core measurement nozzle to fix the top plug at the top of the in-core measurement nozzle.

6. The wire leading-out structure of the sensor for the in-core component flow-induced vibration test according to claim 5, wherein, The top plug assembly further includes a graphite sealing ring bracket assembly and a pressing cylinder. The graphite sealing ring bracket assembly is arranged between the top plug and the in-core measurement nozzle. The upper part of the pressing cylinder is located between the top plug 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.

7. The wire lead-out structure for the in-core component fluid-induced vibration test sensor as described in claim 5, characterized in that, A positioning groove is provided at the bottom of the top plug, and the wire tube moves up and down in the positioning groove.

8. The wire leading-out structure of the sensor for the in-core component flow-induced vibration test according to claim 5, characterized in that, A wire special sealing member and a wire fixing column are provided at the upper part of the top plug.

9. The wire lead-out structure for the sensor used in the in-core component flow-induced vibration test according to claim 1, characterized in that, The bottom flange is fixed at the lower part of the wire tube support structure.

10. The wire lead-out structure for the in-core component flow-induced vibration test sensor according to claim 1, characterized in that, The bottom flange includes a fixing screw and an adjusting screw; the bottom flange is connected to the in-core measurement grid assembly of the in-core component through the fixing screw; the bottom flange adjusts the installation levelness and height of the sensor wire lead-out structure for the in-core component fluid-induced vibration test through the adjusting screw.

11. An installation method for a sensor wire lead-out structure used in in-core component flow-induced vibration tests, characterized in that The installation method of the sensor wire lead-out structure for the in-core component fluid-induced vibration test is used to install the sensor wire lead-out structure for the in-core component fluid-induced vibration test as described in any one of claims 1-10. The installation method includes the following steps: S1. Adjust the installation levelness and height of the sensor wire lead-out structure through the adjusting screw on the bottom flange; S2. After the levelness and height of the sensor wire lead-out structure meet the requirements, tighten the fixing screw to connect the sensor wire lead-out structure with the in-core measurement grid assembly of the in-core component; S3. Pass the sensor wire through the wire tube, install the wire special sealing member, and tighten the sealing nut to complete the sealing of the sensor wire.

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