Radiation-resistant measuring and control cable for nuclear power facilities

Abstract

This utility model relates to the field of measurement and control cable technology, and provides a radiation-resistant measurement and control cable for nuclear power facilities. The cable includes a measurement and control core assembly, a first insulation layer and a first metal sheath, two spare cores, multiple cooling pipes, and an outer sheath. The measurement and control core assembly is coaxially disposed inside the first metal sheath. The two spare cores and multiple cooling pipes are disposed within a cavity between the measurement and control core assembly and the first metal sheath. The first insulation layer fills the cavity between the measurement and control core assembly and the first metal sheath and isolates and covers the spare cores and cooling pipes. The outer sheath is coaxially disposed outside the first metal sheath. The radiation-resistant measurement and control cable for nuclear power facilities according to this utility model can significantly improve radiation resistance and high-temperature resistance, electromagnetic shielding performance, long-term thermal stability, enhanced system reliability and maintenance convenience, and improved mechanical protection and structural integrity.

Description

Technical Field

[0001] This utility model relates to the field of measurement and control cable technology, and in particular to a radiation-resistant measurement and control cable for nuclear power facilities. Background Technology

[0002] In nuclear power plants and other nuclear energy facilities, control cables play a crucial role in transmitting critical signals and data, and their operational reliability directly affects the safety and stability of the entire facility. Due to the extreme conditions present within nuclear facilities, such as high-intensity radiation, high temperatures, high pressures, and potential mechanical stress, ordinary cables are prone to insulation aging, electrical performance degradation, and structural failure under these conditions, severely impacting the accuracy of signal transmission and the reliability of system control. Therefore, developing control cables with excellent radiation resistance, high-temperature resistance, and long-term stable operation has become a critical technical issue urgently needing to be addressed in the field of nuclear power equipment.

[0003] Currently, there are two main types of measurement and control cables commonly used in nuclear power facilities. The first type uses organic polymer materials as the insulation layer or sheath. Although these materials possess good electrical insulation properties to a certain extent, they are prone to molecular chain breakage, cross-linking, or degradation in long-term high-radiation environments. This leads to material embrittlement, decreased insulation resistance, and even short circuits or signal distortion. Furthermore, existing cable structures often lack effective heat dissipation designs. Under high-temperature conditions, the heat inside the cable is difficult to dissipate quickly, further accelerating the thermal aging process of the insulation material and shortening the cable's service life.

[0004] The second type uses metallic materials for conductors, shielding layers, and sheathing, and inorganic materials for insulation. However, due to limitations in the molding process, the shielding structure is incomplete, making it difficult to effectively resist complex electromagnetic interference in the nuclear power environment and affecting the accuracy of signal transmission. Furthermore, it relies on external cooling systems, making it difficult to achieve both uniform heat dissipation and radiation protection, especially in high-power-density applications, thus limiting its applicability in more demanding nuclear power environments. In addition, existing cable structures lack backup designs for conductor damage; a failure in the main control conductor will directly affect the continuity of system operation.

[0005] The publication number CN222213761U provides a nuclear power plant detection cable. The structural design and material system of this solution fail to achieve integrated radiation resistance, high temperature resistance, efficient heat dissipation and mechanical strength. Under the long-term radiation-thermal-mechanical stress coupling effect, the overall performance of the cable is at high risk of degradation, making it difficult to meet the higher safety and life requirements of the next generation of nuclear power facilities for measurement and control cables.

[0006] Therefore, how to provide a radiation-resistant measurement and control cable that overcomes the shortcomings of existing technologies in terms of material radiation resistance, structural integrity, heat dissipation efficiency and system redundancy, and meets the long-term demand of nuclear power facilities for high-reliability measurement and control transmission, has become an urgent technical problem to be solved. Utility Model Content

[0007] In view of this, in order to overcome the shortcomings of the prior art, this utility model aims to provide a radiation-resistant measurement and control cable for nuclear power facilities.

[0008] This utility model provides a radiation-resistant monitoring and control cable for nuclear power facilities. The radiation-resistant monitoring and control cable for nuclear power facilities includes a monitoring and control core group, a first insulation layer and a first metal sheath, two spare cores, multiple cooling pipes and an outer sheath. The monitoring and control core group is coaxially arranged inside the first metal sheath. The two spare cores and multiple cooling pipes are arranged in the cavity between the monitoring and control core group and the first metal sheath. The first insulation layer fills the cavity between the monitoring and control core group and the first metal sheath and isolates and covers the spare cores and cooling pipes. The outer sheath is coaxially arranged outside the first metal sheath.

[0009] Optionally, the radiation-resistant monitoring and control cable for nuclear power facilities of this utility model includes a monitoring and control core assembly comprising a monitoring and control core and a second insulation layer, a ceramic encapsulation layer, a third insulation layer, and a second metal sheath arranged coaxially on the outside of the monitoring and control core.

[0010] Optionally, the radiation-resistant monitoring and control cable for nuclear power facilities of this utility model consists of a monitoring and control conductor and monitoring and control insulation layer, monitoring and control shielding layer, fourth insulation layer and monitoring and control protective layer arranged sequentially from the inside to the outside of the monitoring and control conductor.

[0011] Optionally, the radiation-resistant monitoring and control cable for nuclear power facilities of this utility model has an overall annular ceramic encapsulation layer, with multiple circular through grooves arranged around the circumference of the ceramic encapsulation layer.

[0012] Optionally, in the radiation-resistant monitoring and control cable for nuclear power facilities of this utility model, multiple shielding tubes are arranged one-to-one in a circular through groove.

[0013] Optionally, in the radiation-resistant monitoring and control cable for nuclear power facilities of this utility model, the spare core consists of a spare conductor and a spare insulation layer and a spare sheath arranged sequentially from the inside to the outside of the spare conductor.

[0014] Optionally, in the radiation-resistant monitoring and control cable for nuclear power facilities of this utility model, two spare cores are symmetrically arranged in the cavity between the monitoring and control core group and the first metal sheath, and the centers of the two spare cores are collinear with the center of the monitoring and control core group.

[0015] Optionally, in the radiation-resistant monitoring and control cable for nuclear power facilities of this utility model, the spare core is located at the midpoint of the radial distance between the outer wall of the monitoring and control core group and the inner wall of the first metal sheath.

[0016] Optionally, in the radiation-resistant monitoring and control cable for nuclear power facilities of this utility model, multiple cooling pipes are arranged circumferentially at equal intervals within the cavity between the monitoring and control wire core group and the first metal sheath.

[0017] Optionally, in the radiation-resistant monitoring and control cable for nuclear power facilities of this utility model, the cooling pipe is located at the midpoint of the radial distance between the outer wall of the monitoring and control core assembly and the inner wall of the first metal sheath.

[0018] The radiation-resistant monitoring and control cable for nuclear power facilities of this utility model, through comprehensive structural design and material selection, has the following beneficial technical effects: 1. Significantly improves radiation resistance and high-temperature resistance. It fundamentally overcomes the fatal defects of organic polymer materials being prone to aging and embrittlement under strong radiation, ensuring that the cable can still maintain excellent electrical insulation performance and structural integrity under long-term high-intensity radiation, and improving the overall insulation performance and high-temperature resistance of the measurement and control core assembly.

[0019] 2. Improve electromagnetic shielding performance It effectively suppresses crosstalk between internal conductors and the intrusion of complex external electromagnetic fields, improving the signal transmission quality and electromagnetic interference (EMI) resistance of the cable, and ensuring the accuracy and purity of measurement and control signals in the complex electromagnetic environment of nuclear power plants.

[0020] 3. Improve long-term thermal stability Active heat dissipation fundamentally solves the problem of accelerated thermal aging and shortened lifespan of insulation materials caused by heat accumulation in traditional cables, significantly improving the current carrying capacity and long-term thermal stability of cables, making them particularly suitable for applications with high power density or high ambient temperature.

[0021] 4. Enhanced system reliability and ease of operation and maintenance When the main control and measurement conductor assembly fails due to accidental damage, the backup conductor can be immediately put into use to ensure the continuity of control and measurement signal transmission, avoid the risk of the entire system shutting down due to a single point of failure, and enhance the fault tolerance and safety of nuclear power facilities. At the same time, the core material of the backup conductor is consistent with that of the main control and measurement conductor, ensuring performance consistency after the switchover.

[0022] 5. Enhance mechanical protection and structural integrity The cable employs a multi-layered metal sheath structure with excellent flexibility and fatigue resistance, providing high mechanical strength and enabling it to effectively resist mechanical stresses such as compression, tension, and vibration that may be encountered during installation and operation, thus protecting the internal precision structure from damage. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This invention relates to a radiation-resistant monitoring and control cable for nuclear power facilities, according to an exemplary embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of the measurement and control wire core assembly according to an exemplary embodiment of the present invention; Figure 3 This is a schematic diagram of the measurement and control wire core according to an exemplary embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of a ceramic encapsulation layer according to an exemplary embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of a spare conductor according to an exemplary embodiment of the present invention; In the diagram, 1-Control and measurement conductor group, 2-First insulation layer, 3-First metal sheath, 4-Spare conductor, 5-Cooling pipe, 6-Outer sheath, 11-Control and measurement conductor, 12-Second insulation layer, 13-Ceramic encapsulation layer, 14-Shielding tube, 15-Third insulation layer, 16-Second metal sheath, 111-Control and measurement conductor, 112-Control and measurement insulation layer, 113-Control and measurement shielding layer, 114-Fourth insulation layer, 115-Control and measurement sheath, 131-Circular through slot, 41-Spare conductor, 42-Spare insulation layer, 43-Spare sheath. Detailed Implementation

[0025] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0026] It should be noted that, in the absence of conflict, the following embodiments and features can be combined with each other; and, based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0027] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this disclosure, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0028] Figure 1 This invention provides a radiation-resistant monitoring and control cable for nuclear power facilities according to an exemplary embodiment of the present invention, such as... Figure 1 As shown in this embodiment, the radiation-resistant monitoring and control cable for nuclear power facilities includes a monitoring and control core group 1, a first insulation layer 2 and a first metal sheath 3, two spare cores 4, multiple cooling pipes 5 and an outer sheath 6.

[0029] As an optional example, in this embodiment, the control conductor assembly 1 is coaxially disposed inside the first metal sheath 3. Two spare conductors 4 and multiple cooling tubes 5 made of annealed stainless steel are disposed within the cavity between the control conductor assembly 1 and the first metal sheath 3 made of annealed copper alloy. The first insulation layer 2 is an inorganic mineral insulating powder, such as magnesium oxide powder, that fills the cavity between the control conductor assembly 1 and the first metal sheath 3 and isolates and covers the spare conductors 4 and cooling tubes 5. The outer sheath 6 is coaxially disposed outside the first metal sheath 3. In practical applications, the outer sheath 6 can be made of a polymer material with excellent radiation resistance, such as polyimide, polyetheretherketone, or benzimidazole.

[0030] Figure 2 This is a schematic diagram of the structure of the measurement and control wire core assembly according to an exemplary embodiment of the present invention, as shown below. Figure 1 and 2 As shown, in this embodiment, the measurement and control core group 1 includes a measurement and control core 11 and a second insulating layer 12, a ceramic encapsulation layer 13, a third insulating layer 15, and a second metal sheath 16, which are sequentially and coaxially disposed on the outside of the measurement and control core 11.

[0031] In this embodiment, the second insulating layer 12 and the third insulating layer 15 are densely filled inorganic mineral insulating powders, such as magnesium oxide or aluminum oxide powder. The ceramic encapsulation layer 13 is made of ceramic materials with excellent mechanical and physical properties and insulation and high temperature resistance, such as alumina ceramics or zirconium oxide ceramics. The second metal sheath 16 is a metal tube made of annealed copper alloy or stainless steel alloy.

[0032] Figure 3 This is a schematic diagram of the measurement and control wire core according to an exemplary embodiment of the present invention, as shown below. Figures 1 to 3 As shown, in this embodiment, the measurement and control core 11 consists of a measurement and control conductor 111 and, from the inside out, a measurement and control insulation layer 112, a measurement and control shielding layer 113, a fourth insulation layer 114, and a measurement and control protective layer 115, sequentially disposed outside the measurement and control conductor 111. The measurement and control conductor 111 is an annealed copper wire, and the measurement and control insulation layer 112 and the fourth insulation layer 114 are densely filled inorganic mineral insulating powders, such as magnesium oxide or aluminum oxide powder. The measurement and control shielding layer 113 is an annealed copper alloy tube, and the measurement and control protective layer 115 is an annealed stainless steel tube.

[0033] Figure 4 This is a schematic diagram of the structure of a ceramic encapsulation layer according to an exemplary embodiment of the present invention, as shown below. Figure 4 As shown, in this embodiment, the ceramic encapsulation layer 13 is generally annular, and multiple circular through slots 131 are arranged around its circumference. In this embodiment, multiple shielding tubes 14 are correspondingly arranged within the circular through slots 131. As an optional example, in this embodiment, the shielding tubes 14 are made of annealed copper alloy material. The shielding tubes 14, which are annularly distributed on the outside of the measurement and control wire core 11, can provide efficient shielding protection for the measurement and control wire core 11.

[0034] Figure 5 This is a schematic diagram of the structure of a spare conductor according to an exemplary embodiment of the present invention, as shown below. Figures 1 to 5 As shown, in this embodiment, the spare conductor 4 consists of a spare conductor 41 and a spare insulation layer 42 and a spare sheath 43 arranged sequentially from the inside to the outside of the spare conductor 41.

[0035] As an optional example, in this embodiment, two spare cores 4 are symmetrically arranged within the cavity of the control core group 1 and the first metal sheath 3, with the centers of the two spare cores 4 collinear with the center of the control core group 1. The spare cores 4 are located at the midpoint of the radial distance between the outer wall of the control core group 1 and the inner wall of the first metal sheath 3, reducing the adverse impact on the insulation performance of the first insulation layer 2.

[0036] In this embodiment, the spare conductor 41 is made of the same material as the measurement and control conductor 111, the spare insulation layer 42 is made of the same material as the measurement and control insulation layer 112, and the spare protective layer 43 is made of annealed stainless steel.

[0037] Multiple cooling pipes 5 are evenly spaced and arranged in a circular pattern within the cavity between the measurement and control wire core assembly 1 and the first metal sheath 3. The cooling pipes 5 are located at the midpoint of the radial distance between the outer wall of the measurement and control wire core assembly 1 and the inner wall of the first metal sheath 3, thereby dissipating heat from the entire assembly more evenly and efficiently.

[0038] The radiation-resistant monitoring and control cable for nuclear power facilities according to this utility model embodiment has the following beneficial technical effects through comprehensive structural design and material selection: 1. Significantly improves radiation resistance and high-temperature resistance. The core insulation medium of this cable, from the control insulation layer 112 and the fourth insulation layer 114 inside the control core 11, to the second insulation layer 12 and the third insulation layer 15 of the control core group 1, and all the way to the outermost first insulation layer 2, is made of densely filled inorganic mineral insulating powder such as magnesium oxide and aluminum oxide. This fundamentally overcomes the fatal defects of organic polymer materials that are prone to aging and embrittlement under strong radiation, ensuring that the cable can maintain excellent electrical insulation performance and structural integrity under long-term high-intensity radiation. At the same time, the ceramic encapsulation layer 13 further enhances the overall insulation performance and high-temperature resistance of the control core group 1.

[0039] 2. Improve electromagnetic shielding performance A measurement and control shielding layer 113 is set in the innermost measurement and control core 11. At the measurement and control core group 1 level, multiple shielding tubes 14 are arranged in a ring within the circular through groove 131 of the ceramic encapsulation layer 13 to provide an all-round shielding protection ring for the multiple measurement and control cores 11 inside, effectively suppressing the crosstalk between internal cores and the intrusion of external complex electromagnetic fields. The outermost first metal sheath 3 and second metal sheath 16 constitute the outermost shielding protection. This multi-shielding structure of "independent shielding of cores, overall shielding of groups, and total shielding of outer layers" improves the signal transmission quality and electromagnetic interference (EMI) resistance of the cable, ensuring the accuracy and purity of measurement and control signals in the complex electromagnetic environment of nuclear power plants.

[0040] 3. Improve long-term thermal stability Within the cavity between the measurement and control core group 1 and the first metal sheath 3, multiple cooling pipes 5 made of annealed stainless steel are integrated. These cooling pipes 5 are evenly spaced and circumferentially distributed, forming a built-in fluid channel that allows cooling media (such as gas or liquid) to flow through the inside of the cable, directly carrying away the heat generated by conductor resistance and dielectric loss during operation, thus achieving active heat dissipation. This fundamentally solves the problem of accelerated thermal aging and shortened lifespan of insulation materials caused by heat accumulation in traditional cables, significantly improving the current carrying capacity and long-term thermal stability of the cable, making it particularly suitable for applications with high power density or high ambient temperature.

[0041] 4. Enhanced system reliability and ease of operation and maintenance When the main control and measurement conductor group 1 fails due to accidental damage, the backup conductor group 4 can be put into immediate use to ensure the continuity of control and measurement signal transmission, avoid the risk of the entire system shutting down due to a single point of failure, and enhance the fault tolerance and safety of nuclear power facility operation. At the same time, the core material of the backup conductor group 4 is consistent with that of the main control and measurement conductor group, ensuring performance consistency after switching.

[0042] 5. Enhance mechanical protection and structural integrity The cable employs a multi-layered metal sheath structure, comprising a measurement and control sheath 115, a second metal sheath 16, and a first metal sheath 3. These sheaths are made of annealed copper alloy or stainless steel alloy; the annealing treatment gives them excellent flexibility and fatigue resistance, while the metal material itself provides high mechanical strength, enabling the cable to effectively resist mechanical stresses such as compression, tension, and vibration that may be encountered during installation and operation, protecting the internal precision structure from damage. The outer sheath 6 uses high-performance radiation-resistant polymer materials such as polyimide, providing protection against chemical corrosion and physical abrasion from the external environment.

[0043] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A radiation-resistant monitoring and control cable for nuclear power facilities, characterized in that, The radiation-resistant monitoring and control cable for nuclear power facilities includes a monitoring and control core group (1), a first insulation layer (2) and a first metal sheath (3), two spare cores (4), multiple cooling pipes (5) and an outer sheath (6). The monitoring and control core group (1) is coaxially arranged inside the first metal sheath (3). The two spare cores (4) and multiple cooling pipes (5) are arranged in the cavity between the monitoring and control core group (1) and the first metal sheath (3). The first insulation layer (2) fills the cavity between the monitoring and control core group (1) and the first metal sheath (3) and isolates and covers the spare cores (4) and cooling pipes (5). The outer sheath (6) is coaxially arranged outside the first metal sheath (3).

2. The radiation-resistant monitoring and control cable for nuclear power facilities according to claim 1, characterized in that, The measurement and control core assembly (1) includes a measurement and control core (11) and a second insulation layer (12), a ceramic encapsulation layer (13), a third insulation layer (15), and a second metal sheath (16) arranged coaxially on the outside of the measurement and control core (11).

3. The radiation-resistant monitoring and control cable for nuclear power facilities according to claim 2, characterized in that, The measurement and control core (11) consists of a measurement and control conductor (111) and measurement and control insulation layer (112), measurement and control shielding layer (113), fourth insulation layer (114), and measurement and control protective layer (115) arranged sequentially from the inside to the outside of the measurement and control conductor (111).

4. The radiation-resistant monitoring and control cable for nuclear power facilities according to claim 2, characterized in that, The ceramic encapsulation layer (13) is ring-shaped, and multiple circular through slots (131) are provided on the circumference of the ceramic encapsulation layer (13).

5. The radiation-resistant monitoring and control cable for nuclear power facilities according to claim 4, characterized in that, Multiple shielding tubes (14) are arranged one-to-one in the circular through groove (131).

6. The radiation-resistant monitoring and control cable for nuclear power facilities according to claim 1, characterized in that, The spare conductor (4) consists of a spare conductor (41) and a spare insulation layer (42) and a spare sheath layer (43) arranged sequentially from the inside to the outside of the spare conductor (41).

7. The radiation-resistant monitoring and control cable for nuclear power facilities according to claim 1, characterized in that, Two spare cores (4) are symmetrically arranged in the cavity of the measurement and control core group (1) and the first metal sheath (3), and the center of the two spare cores (4) is collinear with the center of the measurement and control core group (1).

8. The radiation-resistant monitoring and control cable for nuclear power facilities according to claim 7, characterized in that, The spare core (4) is located at the midpoint of the radial distance between the outer wall of the measurement and control core group (1) and the inner wall of the first metal sheath (3).

9. The radiation-resistant monitoring and control cable for nuclear power facilities according to claim 1, characterized in that, Multiple cooling tubes (5) are arranged in a circular pattern at equal intervals within the cavity of the measurement and control wire core group (1) and the first metal sheath (3).

10. The radiation-resistant monitoring and control cable for nuclear power facilities according to claim 9, characterized in that, The cooling pipe (5) is located at the midpoint of the radial distance between the outer wall of the measurement and control core group (1) and the inner wall of the first metal sheath (3).

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