Nuclear power plant reactor core neutron flux measurement channel insulation test device

Abstract

The utility model discloses a nuclear power plant reactor core neutron flux measurement channel insulation test device comprising a housing (1), the housing (1) comprises a display surface, a jack surface and a plug surface, and the jack surface and the plug surface are adjacent to the display surface; the display surface comprises a plurality of button switches (2), the jack surface comprises a first jack (3) and a second jack (4), and the plug surface comprises a third jack (5); at least one part of the plurality of button switches (2) is arranged in the shell (1) in a matrix arrangement manner, at least one part of the button switches is positioned on a display surface of the shell (1), the device further comprises a plurality of internal connecting wires (6), one end of each internal connecting wire (6) is connected with one button switch (2), and the other end of each internal connecting wire (6) is connected with the other button switch (2). And the other ends of the connecting rods are connected with the third jacks (5).

Description

Technical Field

[0001] This utility model relates to the field of insulation performance testing, specifically to an insulation testing device for a neutron flux measurement channel in a nuclear power plant reactor core. Background Technology

[0002] Currently, nuclear power plants use rhodium-powered self-powered neutron-temperature detector (NTD) assemblies. Each NTD assembly contains 7 SPNDs, 1 thermocouple, and 1 Pt100 RTD for cold junction compensation. There are a total of 44 NTD assemblies, each containing 7 SPNDs, for a total of 308 SPNDs. The design requires that before installation, the insulation performance of each SPND in each detector assembly be tested, and the electrical continuity and insulation performance of each neutron flux measurement signal transmission path be checked. After installation, insulation performance testing is performed on the entire path from the SPND to the signal processing cabinet, starting from the connection between the external cable and the neutron flux measurement signal processing cabinet. The neutron flux measurement inspection test in the core measurement system requires insulation performance testing of each detector assembly and its transmission path on four processing cabinet sides. Each assembly requires 15 measurements, for a total of 44 detector assemblies, requiring a total of 660 measurements.

[0003] The current insulation testing method for neutron-temperature detector components includes: inserting one end of a 19-core cable into the neutron flux measurement signal connector in the signal processing cabinet; marking the core numbers, with the 19-core cable numbered 1-19 corresponding one-to-one with the SPND core numbers in the design documents, where cores 2 / 5 / 10 / 19 are grounded and internally shorted, and one core is used for insulation testing between cores; testing the insulation of the outer shell of all SPND signal wire pairs at the other end of the 19-core cable; sequentially testing the insulation between the cores of one signal wire and the other signal wires, and wrapping the tested signal wire with insulating tape; the current field testing tools include prefabricated DuPont 19-core test leads, one end of which can be inserted into the neutron flux measurement signal connector in the signal processing cabinet, and the other end of the cable wrapped together with insulating tape.

[0004] However, current insulation testing methods still have some problems. For example, aviation connectors have 19 cores, each with a diameter of 0.5mm. When multiple test wires are connected to the female connector simultaneously, the test wires are prone to falling off due to the inability to secure them properly. This requires constant checks to ensure correct connection, affecting testing efficiency. For the SPND connector on the top of the cabinet, its high position makes it difficult for personnel to operate, and connecting the core wires presents challenges. Preventing the test wires from falling off under tension increases manpower requirements and test time. Insulation testing requires an insulation resistance of ≥1GΩ between core wires. If a test wire falls off and contacts the outer casing or has poor contact during testing, the test will fail, requiring remeasurement, which affects testing efficiency and completion time. During the initial fuel loading and subcritical testing phases of nuclear power plants, this test typically takes about a week due to on-site testing schedule requirements, impacting on-site progress. Furthermore, during insulation testing, due to the poor reliability of cable connections and the 100VDC insulation test voltage, cable detachment poses a risk of electric shock to personnel.

[0005] Patent document CN219657674U discloses a testing device, specifically a device for facilitating the calibration and insulation testing of aviation plugs. This device includes a main testing unit and an adapter plug, wherein the adapter plug is matched with the main testing unit. However, it does not solve the problem of cable detachment leading to leakage during insulation testing.

[0006] Patent document CN213149152U discloses a multi-core socket insulation testing fixture, including a connection interface, a test circuit, and a test terminal. The connection interface includes various types of connectors for connecting to the multi-core sockets to be tested. Each connector includes multiple pins, which are connected to each core wire of the multi-core socket under test during testing. The test circuit includes multiple bidirectional controllable switches, each including a common terminal, a first terminal, and a second terminal. Each common terminal is connected to each pin. The test terminal includes a test device, a first signal acquisition terminal, and a second signal acquisition terminal. One end of each of the first and second signal acquisition terminals is connected to the test device, and the other end is connected to each of the first and second terminals or ground. This invention sequentially tests the insulation resistance between each core wire and other core wires or ground, avoiding missed or incorrect tests and improving testing efficiency. However, it does not solve the problem of cable detachment leading to leakage during insulation testing.

[0007] In summary, neither of the two existing technologies mentioned above has solved the problem of cable detachment leading to leakage during insulation testing. Utility Model Content

[0008] Based on the above-mentioned technical problems, this utility model proposes an insulation testing device for the neutron flux measurement channel in a nuclear power plant core, which solves the problem of leakage caused by cable detachment during insulation testing.

[0009] To achieve the above objectives, this utility model proposes an insulation testing device for a neutron flux measurement channel in a nuclear power plant reactor core.

[0010] An insulation testing device for a neutron flux measurement channel in a nuclear power plant reactor core includes:

[0011] The housing includes a display surface, a socket surface, and a plug surface, wherein the socket surface and the plug surface are adjacent to the display surface.

[0012] The display surface includes multiple button switches, the socket surface includes a first socket and a second socket, and the plug surface includes a third socket;

[0013] At least a portion of the plurality of push-button switches are arranged in a matrix inside the housing, and at least a portion of the push-button switches are located on the display surface of the housing. The device also includes a plurality of internal connecting wires, one end of each of the internal connecting wires being connected to one of the push-button switches, and the other end being connected to the third socket.

[0014] Furthermore, the push button switch includes a button cap, a return spring, a support rod, multiple normally open stationary contacts, multiple normally closed stationary contacts, and a bridge-type stationary contact. One end of the support rod is connected to the button cap, and the other end is connected to the bridge-type stationary contact. The return spring is wound around the support rod.

[0015] The bridge-type stationary contact is always connected to either the two normally closed stationary contacts or the two normally open stationary contacts.

[0016] Furthermore, the normally closed stationary contact of each of the push-button switches is connected to the normally closed stationary contact of the adjacent push-button switch.

[0017] Furthermore, the normally open stationary contact of each of the push-button switches is connected to the normally open stationary contact of the adjacent push-button switch.

[0018] Furthermore, one end of each of the internal connecting wires is connected to a support rod of one of the push-button switches, and the other end is connected to the third socket.

[0019] Furthermore, the diameter of the cross-section of the internal connecting line is 0.3mm-0.5mm.

[0020] Furthermore, the first socket is connected to the normally closed stationary contact of the adjacent push-button switch.

[0021] Furthermore, the second socket is connected to the normally open stationary contact of the adjacent push-button switch.

[0022] Furthermore, the diameter of the button cap is 2.5cm-3cm.

[0023] Furthermore, both the first and second sockets are located in the socket surface, at a distance of 14cm-16cm from the non-adjacent side of the display surface and the socket surface.

[0024] Furthermore, the first socket is located at a distance of 3-4 cm from the adjacent side of the display surface and the socket surface.

[0025] Furthermore, the second socket is located at a distance of 14-16 cm from the adjacent side of the display surface and the socket surface.

[0026] Furthermore, the third socket is located in the plug surface, at a distance of 14cm-16cm from the non-adjacent side of the display surface and the plug surface.

[0027] Furthermore, the third socket is located in the plug surface, at a distance of 8cm-10cm from the adjacent side of the display surface and the plug surface.

[0028] Based on the above technical solution, this utility model has at least the following beneficial effects:

[0029] 1. This utility model proposes an insulation testing device for the neutron flux measurement channel in a nuclear power plant core. Through the integrated design of a self-locking push-button switch and a dedicated aviation connector, it achieves rapid and stable point-to-point insulation testing, reducing test failures and repeated measurements caused by test lead detachment or poor contact. This improves the efficiency of insulation performance testing for the neutron flux measurement channel in the nuclear power plant core. Simultaneously, the design effectively avoids the risk of electric shock to personnel. Utilizing the electrical isolation and switching performance of the push-button switch, it ensures both testing accuracy and operator safety. This efficient and safe design enables nuclear power plants to quickly complete insulation performance testing during the initial fuel loading and subcritical testing phases, meeting the schedule requirements of the on-site testing plan.

[0030] 2. This utility model proposes an insulation testing device for the neutron flux measurement channel in a nuclear power plant core. Through a specialized tool paired with an insulation tester and an SPND aviation plug interface, it ensures robustness, reliability, and good contact during insulation performance testing, eliminating the risk of leakage. This design not only improves the durability of the tool and reduces material consumption, but also allows the device to be reused in subsequent nuclear power units, reducing long-term operating costs. Furthermore, the tool's wide applicability makes it suitable not only for most currently operating nuclear power units in China, but also for units with domestically produced rhodium self-sufficient detector assemblies. It plays a crucial role during system commissioning and later refueling and overhaul periods, greatly expanding the device's application scope.

[0031] 3. This utility model proposes an insulation testing device for the neutron flux measurement channel in a nuclear power plant core. Through a self-locking push-button switch design, testing personnel can easily measure the insulation resistance between the core wires without complex wiring operations, thus reducing manpower requirements and testing time. This simplified operation process not only improves the work efficiency of testing personnel but also reduces the failure rate caused by complex operations. Furthermore, the design of this tool reduces the risk of personal injury caused by wire detachment, further improving the safety of on-site testing. With this innovative tool, nuclear power plants can more efficiently and safely complete the insulation performance testing of the neutron flux measurement channel in the core, ensuring the safe and stable operation of the nuclear power plant. Attached Figure Description

[0032] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model and do not constitute an undue limitation thereof. In the drawings:

[0033] Figure 1 A schematic diagram of an insulation test apparatus for a nuclear power plant core neutron flux measurement channel is shown in one embodiment.

[0034] Figure 2 A schematic diagram of a push-button switch for an insulation test device for a neutron flux measurement channel in a nuclear power plant core, according to one embodiment, is shown.

[0035] Figure 3 A schematic diagram of the socket surface of an insulation test device for measuring neutron flux in a nuclear power plant core, according to one embodiment, is shown.

[0036] Figure 4 A schematic diagram of the plug face of an insulation test apparatus for measuring neutron flux in a nuclear power plant core, according to one embodiment, is shown.

[0037] Figure 5 A schematic diagram of the internal structure of an insulation test apparatus for measuring neutron flux in a nuclear power plant core, according to one embodiment, is shown.

[0038] The above figures include the following reference numerals:

[0039] 1. Outer casing; 2. Push-button switch; 3. First socket; 4. Second socket; 5. Third socket; 6. Internal connecting wires;

[0040] 2a. Button cap; 2b. Return spring; 2c. Support rod; 2d. Normally open stationary contact; 2e. Normally closed stationary contact; 2f. Bridge-type stationary contact. Detailed Implementation

[0041] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0042] The present invention will be further described in detail below with reference to specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed by the present invention. The term "comprising" indicates the presence of a feature, but does not exclude the presence or addition of one or more other features. The terms "lateral," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the purpose of description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In this description, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0044] Example

[0045] To address the issue of cable detachment causing leakage during insulation testing, such as... Figure 1 As shown, this utility model proposes an insulation testing device for a neutron flux measurement channel in a nuclear power plant reactor core.

[0046] Example 1

[0047] like Figure 1An insulation test device for measuring neutron flux in a nuclear power plant reactor core is shown, comprising a housing 1, wherein the housing 1 includes a display surface, a socket surface, and a plug surface, and the socket surface and the plug surface are both adjacent to the display surface;

[0048] The display surface includes multiple button switches 2, the socket surface includes a first socket 3 and a second socket 4, and the plug surface includes a third socket 5;

[0049] At least a portion of the plurality of button switches 2 are arranged in a matrix inside the housing 1, and at least a portion of the button switches are located on the display surface of the housing 1. The device also includes a plurality of internal connecting wires 6, one end of each internal connecting wire 6 being connected to one of the button switches 2, and the other end being connected to the third socket 5.

[0050] Furthermore, such as Figure 2 The diagram shows a push-button switch 2, comprising a button cap 2a, a return spring 2b, a support rod 2c, a normally open stationary contact 2d, a normally closed stationary contact 2e, and a bridge-type stationary contact 2f.

[0051] Furthermore, combined with, for example Figure 3 and Figure 4 As shown, the first socket 3 and the second socket 4 are located on the socket surface of the outer casing 1, and the third socket 5 is located on the plug surface of the outer casing 1.

[0052] Furthermore, such as Figure 5 The diagram shows multiple internal connecting wires 6 inside the outer casing 1. One end of each internal connecting wire 6 is connected to a button switch 2, and the other end is connected to the third socket 5.

[0053] Preferably, the diameters of the first and second sockets are 5mm, the diameter of the button cap 2a of the push-button switch is 2.8cm, the diameter of the internal connecting wire 6 is 0.5mm, and the resistance is greater than 1GΩ.

[0054] Furthermore, during testing, one end of the cable to be measured is connected to the third socket 5, and the instrument probe of the insulation tester is inserted into the first socket 3 and the second socket 4 respectively.

[0055] Furthermore, the device is equipped with 19 push-button switches 2. When a push-button switch 2 is pressed, the normally closed stationary contact 2e and the bridge-type stationary contact 2f are disconnected, and the normally open stationary contact 2d is closed. When the push-button switch 2 is pressed again, the normally open stationary contact 2d is disconnected, and the push-button switch 2 is reset.

[0056] Furthermore, the display surface is located on the outer casing 1 adjacent to the socket surface and the plug surface, with the plug surface being adjacent to the socket surface.

[0057] Example 2

[0058] like Figure 1 An insulation test device for measuring neutron flux in a nuclear power plant reactor core is shown, comprising a housing 1, wherein the housing 1 includes a display surface, a socket surface, and a plug surface, and the socket surface and the plug surface are both adjacent to the display surface;

[0059] The display surface includes multiple button switches 2, the socket surface includes a first socket 3 and a second socket 4, and the plug surface includes a third socket 5;

[0060] At least a portion of the plurality of button switches 2 are arranged in a matrix inside the housing 1, and at least a portion of the button switches are located on the display surface of the housing 1. The device also includes a plurality of internal connecting wires 6, one end of each internal connecting wire 6 being connected to one of the button switches 2, and the other end being connected to the third socket 5.

[0061] Furthermore, such as Figure 2 The diagram shows a push-button switch 2, comprising a button cap 2a, a return spring 2b, a support rod 2c, a normally open stationary contact 2d, a normally closed stationary contact 2e, and a bridge-type stationary contact 2f.

[0062] Furthermore, combined with, for example Figure 3 and Figure 4 As shown, the first socket 3 and the second socket 4 are located on the socket surface of the outer casing 1, and the third socket 5 is located on the plug surface of the outer casing 1.

[0063] Furthermore, such as Figure 5 The diagram shows multiple internal connecting wires 6 inside the outer casing 1. One end of each internal connecting wire 6 is connected to a button switch 2, and the other end is connected to the third socket 5.

[0064] Preferably, the diameters of the first and second sockets are 5mm, the diameter of the button cap 2a of the push-button switch is 2.8cm, the diameter of the internal connecting wire 6 is 0.5mm, and the resistance is greater than 1GΩ.

[0065] Furthermore, during testing, one end of the cable to be measured is connected to the third socket 5, and the instrument probe of the insulation tester is inserted into the first socket 3 and the second socket 4 respectively.

[0066] Furthermore, the device is equipped with 19 push-button switches 2. When a push-button switch 2 is pressed, the normally closed stationary contact 2e and the bridge-type stationary contact 2f are disconnected, and the normally open stationary contact 2d is closed. When the push-button switch 2 is pressed again, the normally open stationary contact 2d is disconnected, and the push-button switch 2 is reset.

[0067] Furthermore, the display surface is located on the outer casing 1 adjacent to the socket surface and the plug surface, and the display surface is located on the opposite side of the socket surface on the outer casing.

[0068] In summary, as can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0069] 1. This utility model proposes an insulation testing device for the neutron flux measurement channel in a nuclear power plant core. Through the integrated design of a self-locking push-button switch and a dedicated aviation connector, it achieves rapid and stable point-to-point insulation testing, reducing test failures and repeated measurements caused by test lead detachment or poor contact. This improves the efficiency of insulation performance testing for the neutron flux measurement channel in the nuclear power plant core. Simultaneously, the design effectively avoids the risk of electric shock to personnel. Utilizing the electrical isolation and switching performance of the push-button switch, it ensures both testing accuracy and operator safety. This efficient and safe design enables nuclear power plants to quickly complete insulation performance testing during the initial fuel loading and subcritical testing phases, meeting the schedule requirements of the on-site testing plan.

[0070] 2. This utility model proposes an insulation testing device for the neutron flux measurement channel in a nuclear power plant core. Through a specialized tool paired with an insulation tester and an SPND aviation plug interface, it ensures robustness, reliability, and good contact during insulation performance testing, eliminating the risk of leakage. This design not only improves the durability of the tool and reduces material consumption, but also allows the device to be reused in subsequent nuclear power units, reducing long-term operating costs. Furthermore, the tool's wide applicability makes it suitable not only for most currently operating nuclear power units in China, but also for units with domestically produced rhodium self-sufficient detector assemblies. It plays a crucial role during system commissioning and later refueling and overhaul periods, greatly expanding the device's application scope.

[0071] 3. This utility model proposes an insulation testing device for the neutron flux measurement channel in a nuclear power plant core. Through a self-locking push-button switch design, testing personnel can easily measure the insulation resistance between the core wires without complex wiring operations, thus reducing manpower requirements and testing time. This simplified operation process not only improves the work efficiency of testing personnel but also reduces the failure rate caused by complex operations. Furthermore, the design of this tool reduces the risk of personal injury caused by wire detachment, further improving the safety of on-site testing. With this innovative tool, nuclear power plants can more efficiently and safely complete the insulation performance testing of the neutron flux measurement channel in the core, ensuring the safe and stable operation of the nuclear power plant.

[0072] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0073] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0074] It should be noted that, in the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

Claims

1. An insulation testing device for a neutron flux measurement channel in a nuclear power plant reactor core, characterized in that, Includes a housing (1), the housing (1) including a display surface, a socket surface and a plug surface, the socket surface and the plug surface being adjacent to the display surface; The display surface includes multiple button switches (2), the socket surface includes a first socket (3) and a second socket (4), and the plug surface includes a third socket (5); At least a portion of the multiple push-button switches (2) are arranged in a matrix inside the housing (1), and at least a portion of the push-button switches are located on the display surface of the housing (1). The device also includes multiple internal connecting wires (6), one end of each internal connecting wire (6) is connected to one of the push-button switches (2), and the other end is connected to the third socket (5).

2. The apparatus according to claim 1, characterized in that, The push-button switch (2) includes a button cap (2a), a return spring (2b), a support rod (2c), multiple normally open stationary contacts (2d), multiple normally closed stationary contacts (2e), and a bridge-type stationary contact (2f). One end of the support rod (2c) is connected to the button cap (2a), and the other end is connected to the bridge-type stationary contact (2f). The return spring (2b) is wound around the support rod (2c). The bridge-type stationary contact (2f) is always connected to either the two normally closed stationary contacts (2e) or the two normally open stationary contacts (2d).

3. The apparatus according to claim 2, characterized in that, The normally closed stationary contact (2e) of each of the push button switches (2) is connected to the normally closed stationary contact (2e) of the adjacent push button switch (2).

4. The apparatus according to claim 3, characterized in that, The normally open stationary contact (2d) of each of the push button switches (2) is connected to the normally open stationary contact (2d) of the adjacent push button switch (2).

5. The apparatus according to claim 3, characterized in that, One end of each of the internal connecting wires (6) is connected to a support rod (2c) of a push-button switch (2), and the other end is connected to the third socket (5).

6. The apparatus according to claim 5, characterized in that, The diameter of the cross-section of the internal connecting line (6) is 0.3mm-0.5mm.

7. The apparatus according to claim 3, characterized in that, The first socket (3) is connected to the normally closed stationary contact (2e) of the adjacent push button switch (2).

8. The apparatus according to claim 3, characterized in that, The second socket (4) is connected to the normally open stationary contact (2d) of the adjacent push button switch (2).

9. The apparatus according to claim 3, characterized in that, The diameter of the button cap (2a) is 2.5cm-3cm.

10. The apparatus according to claim 1, characterized in that, The first socket (3) and the second socket (4) are both located in the socket surface, at a distance of 14cm-16cm from the non-adjacent side of the display surface and the socket surface.

11. The apparatus according to claim 10, characterized in that, The first socket (3) is located at a distance of 3-4 cm from the adjacent side of the display surface and the socket surface.

12. The apparatus according to claim 10, characterized in that, The second socket (4) is located at a distance of 14-16cm from the adjacent side of the display surface and the socket surface.

13. The apparatus according to claim 12, characterized in that, The third socket (5) is located in the plug surface, at a distance of 14cm-16cm from the non-adjacent side of the display surface and the plug surface.

14. The apparatus according to claim 12, characterized in that, The third socket (5) is located in the plug surface at a distance of 8cm-10cm from the adjacent side of the display surface and the plug surface.

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