Electrical penetration assembly of integrated small reactor and assembly method

Abstract

The invention relates to an electrical penetration assembly of an integrated small reactor and an assembling method, the electrical penetration assembly comprises an inner flange and an outer flange which are connected to two ends of a cylinder, a support plate is arranged on one side, far away from the cylinder, of the inner flange and the outer flange, and a plurality of groups of feed-through conductor assemblies are arranged in a closed cavity formed by the inner flange, the cylinder and the outer flange in parallel; two ends penetrate out of the surface of the supporting plate; each group of feed-through conductor assembly is connected with the outer surfaces of the inner flange and the outer flange through corresponding sealing pieces, and the two ends of each group of feed-through conductor assembly are connected with the surface of the supporting plate through corresponding anti-rotation mechanisms. The feed-through conductor assemblies are arranged in the closed cavity formed by the inner flange, the cylinder and the outer flange in parallel, organic materials can be prevented from being used in multiple sealing structures, sealing is achieved through welding or inorganic materials, and the high-temperature sealing performance of the electrical penetration assembly under the accident working condition is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear energy equipment, in particular to an electrical penetration component of an integrated small reactor and an assembly method thereof. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] The small integrated heating reactor adopts a compact and integrated reactor body design, which makes the working conditions in the containment complex and the structural design highly integrated and modular. For example, a certain type of reactor has a design life of 60 years, a long-term operating temperature of 260°C, an equivalent cumulative irradiation dose of up to the 7th power (γ, Gy), a peak temperature of up to 350°C and a peak pressure of up to 7MPa under accident conditions, and is accompanied by flooding, and the working conditions are extremely harsh.

[0004] Electrical penetrations are parts installed on the containment of nuclear facilities for cable penetration. Since the structure of an integrated reactor is highly integrated, it has relatively higher safety redundancy requirements for its internal parts. Electrical penetrations are required to maintain sealing and electrical functions for a certain period of time in harsh environments such as high temperature, high pressure, radiation and flooding in accident conditions. For an integrated reactor with a highly integrated structure, the sealing failure caused by high temperature is an issue that needs to be paid special attention to.

[0005] At present, the electrical penetrations used in nuclear power plants are mainly divided into two technical solutions. One is to use organic materials and seal them through spinning; the other is to use inorganic materials and seal them through sintering.

[0006] For example, the prior art CN117198568 discloses an electrical penetration, in which the filler material is PEEK material, which is sealed by spinning. Since the glass transition temperature of PEEK material is about 143°C and the softening point temperature is about 168°C, the sealing performance of this type of electrical penetration is difficult to ensure at high temperatures, and its long-term operating temperature generally does not exceed 120°C. At the same time, the wiring method of the above-mentioned electrical penetration adopts terminal blocks or cold crimping, which is time-consuming, and the conductor is not resistant to water flooding, and the conductor shielding is discontinuous, which is not suitable for use in integrated reactors.

[0007] Prior art CN115548766 discloses a medium-voltage power electrical penetration for a high-temperature and high-pressure nuclear environment, wherein the inner medium-voltage conductor and the flange, and the outer medium-voltage conductor and the flange cover are sealed with sintered glass, which reduces the effects of high temperature and radiation on the accelerated aging of the sealing material. An insulating sleeve is installed on the outer surface of the conductor to ensure the insulation continuity of the entire length of the conductor. However, since the insulating sleeve is generally made of organic materials such as rubber or PEEK plastic, the electrical insulation performance of this type of electrical penetration at high temperature is also difficult to ensure, and its long-term operating temperature generally does not exceed 150°C. Although the operating temperature of the electrical penetration is improved compared to the previous type, it is still difficult to meet the needs of an integrated reactor. At the same time, the wiring method of the above-mentioned electrical penetration also adopts cold crimping or wire nose, which is time-consuming to install, and the conductor is not resistant to flooding. Summary of the invention

[0008] In order to solve the technical problems existing in the above-mentioned background technology, the present invention provides an electrical penetration component and an assembly method for an integrated small reactor, which is resistant to high temperature, radiation, and flooding, easy to install, and has good shielding effect, and meets the operating conditions of the integrated small reactor.

[0009] In order to achieve the above object, the present invention adopts the following technical solution:

[0010] A first aspect of the present invention provides an electrical penetration piece for an integrated small reactor, comprising an inner flange and an outer flange connected at both ends of a cylinder, a support plate being provided on the side of the inner flange and the outer flange away from the cylinder, a plurality of groups of feed-through conductor assemblies being arranged in parallel in a closed cavity formed by the inner flange, the cylinder and the outer flange, and both ends passing through the surface of the support plate; each group of feed-through conductor assemblies is connected to the outer surfaces of the inner flange and the outer flange through corresponding sealing members, and both ends of each group of feed-through conductor assemblies are connected to the surface of the support plate through corresponding anti-rotation mechanisms.

[0011] Furthermore, the inner flange and the outer flange are respectively arranged at both ends of the cylinder, and a closed cavity is formed after being connected. The inner flange and the outer flange are both provided with a plurality of channels for the feed-through conductor components to pass through.

[0012] Furthermore, the seal includes a ferrule assembly or a welding connection, and sealing is achieved by connecting the feed-through conductor assembly through the outer surface portion of the inner flange and the outer flange through the ferrule assembly, or by welding the feed-through conductor assembly through the outer surface portion of the inner flange and the outer flange.

[0013] Furthermore, the feed-through conductor assembly includes a sheath tube, an insulated wire is arranged inside the sheath tube, and connectors are arranged at both ends of the insulated wire.

[0014] Furthermore, the sheath tube of the feed-through conductor assembly is connected to the outer surfaces of the inner flange and the outer flange through a seal, and the seal is located between the inner flange and the support plate, and between the outer flange and the support plate.

[0015] Furthermore, the support plate is arranged in parallel on the outside of the inner flange and the outer flange, and is connected to the corresponding flange through a connecting rod. A plurality of channels for the feed-through conductor assembly to pass through are provided on the support plate, and the circumferential outer side of the connector of the feed-through conductor assembly is connected to the channel on the support plate through an anti-rotation mechanism.

[0016] Furthermore, the connector includes a shell and a tail cover, one end of the tail cover is connected to the sheath tube and the other end is connected to the shell, one end of the insulated wire is inserted into the tail cover and fixed, and the led-out insulated wire passes through the insulator and is connected to the conductor inside the shell, and the insulator is located between the shell and the tail cover.

[0017] Furthermore, the outer circumferential side of the tail cover cooperates with the anti-rotation mechanism through a plurality of limit members.

[0018] Furthermore, the anti-rotation mechanism is located on the inner surface of the channel of the support plate, and is enclosed on the outer side of the circumference of the tail cover by at least two anti-rotation blocks. A limiting groove is provided on the inner side of the circumference of the anti-rotation block, and a limiting piece is provided on the outer side of the circumference. The limiting groove on the inner side of the circumference cooperates with the limiting piece of the connector tail cover, and the limiting piece on the outer side of the circumference cooperates with the limiting groove on the inner surface of the channel of the support plate.

[0019] A second aspect of the present invention provides a method for assembling an electrical penetration member of an integrated small reactor, comprising the following steps:

[0020] The inner flange, cylinder and outer flange made of metal are welded to form a closed cavity;

[0021] The metal shell and conductor, and the glass and / or ceramic insulator are assembled in sequence, and a sealed whole is formed by glass-metal sintering or ceramic-metal brazing, and a metal tail cover is assembled to form a connector;

[0022] The insulated wire is inserted into a metal sheath tube, the wires led out from both ends of the insulated wire are respectively connected to the conductors of the corresponding connector, and the tail cover is connected to the sheath tube to form a feed-through conductor assembly;

[0023] A set number of feed-through conductor assemblies are sequentially passed through the inner flange, the barrel and the outer flange, and are fixed and sealed by a seal;

[0024] The support plate is assembled on the outer sides of the inner flange and the outer flange through the connecting rod, and the anti-rotation mechanism penetrates into the cavity between the hole of the support plate and the connector, and after being fixed, an assembled electrical penetration piece is obtained.

[0025] Compared with the prior art, one or more of the above technical solutions have the following beneficial effects:

[0026] 1. Multiple groups of feed-through conductor assemblies are arranged in parallel in a closed cavity formed by the inner flange, the cylinder and the outer flange. The connection between the feed-through conductor assembly and the inner flange and the outer flange forms a seal. At the same time, the feed-through conductor assembly itself still has a protective seal for the insulated wire. The structure of multiple seals can avoid the use of organic materials. Sealing is achieved by welding or inorganic materials to ensure the high-temperature sealing of the electrical penetration under accident conditions.

[0027] 2. The installation interface of the electrical penetration adopts a connector. By setting the connector at the support plate, it can cooperate with the connector on the field side to achieve quick plug-in or separation, and at the same time achieve a sealed and waterproof function. No redundant structures such as wire protection boxes are required, which is suitable for the narrow space characteristics of the integrated reactor. At the same time, the sheath tube is protected in the closed cavity formed by the inner flange, the cylinder and the outer flange, which also ensures the continuous penetration of the shielding layer and the shielding effect is good.

[0028] 3. The structure does not contain any organic materials, which minimizes the aging effects of temperature and radiation on electrical penetration parts, and is suitable for extremely harsh environmental conditions such as high temperature and high radiation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0030] Figure 1 is a schematic diagram of the structure of an electrical penetration provided by one or more embodiments of the present invention;

[0031] Figure 2 is a schematic cross-sectional structure diagram of an electrical penetration member provided by one or more embodiments of the present invention;

[0032] Figure 3 is a schematic structural diagram of a feed-through conductor assembly provided by one or more embodiments of the present invention;

[0033] Figure 4 is a schematic diagram of the structure of a connector provided by one or more embodiments of the present invention;

[0034] Figure 5 is a schematic diagram of the structure of a support plate provided by one or more embodiments of the present invention;

[0035] Figure 6 It is a schematic diagram of the structure of the anti-rotation mechanism provided by one or more embodiments of the present invention.

[0036] In the figure, 1-inner flange, 2-cylinder, 3-outer flange, 4-feedthrough conductor assembly, 5-support plate, 6-anti-rotation mechanism, 7-connecting rod, 8-ferrule assembly, 41-sheath tube, 42-insulated wire, 43-connector, 431-housing, 432-tail cover, 433-conductor, 434-insulator, 435-flat part, 51-channel, 52-limiting groove in the channel, 61-stop block, 62 stop block limiter, 71-screw, 72-fastener. DETAILED DESCRIPTION

[0037] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0038] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0039] Terminology explanation:

[0040] Safety barrier refers to the key design in a nuclear power plant that ensures that radioactive materials do not leak into the environment. Generally, a nuclear power plant has three safety barriers.

[0041] The first safety barrier is the fuel pellets and fuel cladding. The fuel pellets are usually made of sintered uranium dioxide ceramics. Most of their microporous structures are not connected to the outside world and can retain most of the radioactive materials produced by nuclear fission. The fuel pellets are loaded into cladding made of zirconium alloy or stainless steel to form fuel element rods.

[0042] The second safety barrier is a pressure vessel and a closed primary circuit system. The pressure vessel is used to enclose the core composed of nuclear fuel.

[0043] The third safety barrier is the containment (reactor building), which is generally a prestressed reinforced concrete structure with a thickness of 1 meter and a steel lining on the inner surface, which has good sealing performance. The containment is also equipped with a safety injection system, a containment spray system, a hydrogen removal system, an air purification and cooling system, etc. to cope with possible extreme accidents.

[0044] Since various systems require power supply and transmission of control signals, electrical penetrations are installed on the containment for cables to pass through the containment. Electrical penetrations have corresponding design requirements in terms of sealing, electrical continuity, pressure bearing and temperature resistance. Especially in the event of an accident, the electrical penetrations are required to withstand the harsh environment of high temperature, radiation and flooding caused by the accident, and maintain basic functions and sealing.

[0045] As introduced in the background art, some electrical penetrations in the prior art use organic materials in some locations to solve the problem of continuous shielding. However, such materials are not resistant to high temperatures in most cases, and the conductor parts are not resistant to water flooding and wiring is time-consuming.

[0046] Therefore, the following embodiments provide an electrical penetration component and an assembly method for an integrated small reactor, which solves the problem of conventional penetration components failing under high temperature, high radiation, and flooding conditions, and solves the problem of time-consuming wiring of electrical penetration components and discontinuous conductor shielding.

[0047] Embodiment 1:

[0048] The electrical penetration parts of the integrated small reactor include an inner flange and an outer flange connected to the two ends of the cylinder, a support plate is provided on the side of the inner flange and the outer flange away from the cylinder, a plurality of groups of feed-through conductor assemblies are arranged in parallel in a closed cavity formed by the inner flange, the cylinder and the outer flange, and pass through the support plate, the feed-through conductor assemblies are connected to the outer surfaces of the inner flange and the outer flange through a seal, and the two ends of the feed-through conductor assemblies are connected to the surface of the support plate through an anti-rotation mechanism.

[0049] like Figure 1 As shown, the electrical penetration component includes an inner flange 1, a cylinder 2, an outer flange 3, a feed-through conductor assembly 4, a support plate 5, an anti-rotation mechanism 6, a connecting rod 7 and a ferrule assembly 8.

[0050] The inner flange 1 and the outer flange 3 are respectively arranged at both ends of the cylinder 2, and a closed cavity is formed by welding. The inner flange and the outer flange are both provided with a plurality of passages for the feed-through conductor assembly to pass through, and in this embodiment, 12 passages are provided for the feed-through conductor assembly to pass through.

[0051] The inner flange, the cylinder body and the outer flange are made of stainless steel or other metal materials. In this embodiment, the inner flange 1, the cylinder body 2 and the outer flange 3 are made of stainless steel.

[0052] The electrical penetration piece is installed with feed-through conductor assemblies corresponding to the number of channels. In this embodiment, 12 feed-through conductor assemblies 4 are installed.

[0053] like Figure 2 As shown, the feed-through conductor assembly 4 is disposed in a closed cavity, and passes through the inner flange 1, the cylinder 2 and the outer flange 3 in sequence, and its two ends pass through the channels provided on the inner flange 1 and the outer flange 3 respectively.

[0054] The feed-through conductor assembly 4 is fixed and sealed with the inner flange 1 and the outer flange 3 by using a clamp assembly 8 to form a double-pass seal. The seal can also be achieved by welding.

[0055] like Figure 3As shown, the feed-through conductor assembly 4 includes a sheath tube 41, an insulated wire 42 disposed inside the sheath tube, and connectors 43 disposed at both ends of the insulated wire 42. The sheath tube 41 is fixed and sealed with the inner flange 1 and the outer flange 3, and the connector 43 is fixedly connected with the support plate.

[0056] The feed-through conductor assembly 41 adopts a modular and standardized design, has a unified and serialized sheath tube diameter specification and length specification, and can be combined according to functional requirements.

[0057] The feed-through conductor assemblies 41 are arranged in a hierarchical manner, and the outer diameters of the 12 feed-through conductor assemblies 41 are the same. Usually, in order to facilitate the quick installation and separation of the connector, when the feed-through conductor assemblies 41 are arranged in a circular manner, the feed-through conductor assemblies 41 close to the inner circle are longer, and the feed-through conductor assemblies 41 close to the outer circle are shorter.

[0058] A plurality of insulated wires 42 are arranged in the sheath tube 41 ; the number of the insulated wires 42 is not limited and depends on actual needs.

[0059] The sheath tube is made of stainless steel or other metal materials, and the insulated wire is a mineral insulated wire and / or a fiber-wrapped wire, which does not contain organic materials and has excellent high temperature resistance and radiation resistance. The core wire of the insulated wire is made of copper, nickel or alloy. In this embodiment, the sheath tube 41 is made of stainless steel, and the insulated wire 42 is a fiber-wrapped wire, and the core wire of the insulated wire 42 is made of copper.

[0060] like Figure 3 and Figure 4 As shown, the connector 43 includes a housing 431 , a tail cover 432 disposed at the rear end of the housing, a conductor 433 disposed inside the housing, and an insulator 434 disposed between the housing 431 and the tail cover 43 .

[0061] In this embodiment, nine conductors 433 are arranged in the housing 431 .

[0062] In this embodiment, the housing 431 and the tail cover 432 are both made of stainless steel, the conductor 433 is made of copper, and the insulator 434 is made of glass or ceramic. In this embodiment, the insulator 434 is made of glass.

[0063] The connector 43 is sealed by glass metal sintering or ceramic metal brazing, and the shell 431, the conductor 433 and the insulator 434 are made into a sealed whole.

[0064] The conductor 433 of the connector 43 is fixedly connected to the insulated wire 42 by crimping, termination, welding or other means, one end of the tail cover 432 is fixedly connected to the shell 431 by thread, bayonet, welding or other means, and the other end is fixedly connected to the sheath tube 41 by welding or other means.

[0065] A plurality of flat pieces are disposed on the outer circumference of the tail cover 432 , for example, there are two flat pieces, one for clamping and the other for cooperating with the anti-rotation mechanism 6 .

[0066] like Figure 5 As shown, the support plate 5 is arranged parallel to the outer sides of the inner flange 1 and the outer flange 3, and is fixed by connecting rods 7 and flanges. The support plate 5 is provided with 12 holes 51 for the connectors of the feed-through conductor assembly to pass through, and the inner side of the hole 51 is provided with an inner limit groove 52.

[0067] The anti-rotation mechanism 6 is disposed between the support plate 5 and the connector 43, and the anti-rotation mechanism 6 is fixed to the support plate 5 by bolts. Figure 6 As shown, the anti-rotation mechanism 6 is formed by two anti-rotation blocks 61, a limiting groove is provided on the inner side of the circumference of the anti-rotation block 61, and a limiting piece 62 is provided on the outer side of the circumference. The limiting groove cooperates with the flat piece 435 of the connector 43, and the limiting piece 62 cooperates with the limiting groove 52 in the channel of the support plate 5. When the tail cover 432 of the connector 43 is connected to the channel of the support plate 5 through the anti-rotation mechanism 6 formed by the two anti-rotation blocks 61, a series of limiting grooves and limiting pieces are used to cooperate to prevent the feed-through conductor assembly from rotating.

[0068] The flat piece 435 can also be replaced by a limiting part of other structural types, and the shape and size can match the outer circumference of the anti-rotation block 61. This embodiment is only used as an example and does not limit its specific structural type.

[0069] In the above structure, multiple groups of feed-through conductor assemblies are arranged in parallel in a closed cavity formed by the inner flange, the cylinder and the outer flange. The connection between the feed-through conductor assembly and the inner flange and the outer flange forms a seal. At the same time, the feed-through conductor assembly itself still has a protective seal for the insulated wire. The structure with multiple seals can avoid the use of organic materials. Sealing is achieved by welding or inorganic materials, thereby ensuring the high-temperature sealing of the electrical penetration under accident conditions.

[0070] The installation interface of the electrical penetration adopts a connector. By setting the connector on the support plate, it can cooperate with the connector on the field side to achieve quick plug-in or separation, and at the same time achieve a sealed and waterproof function. No redundant structures such as wire protection boxes are required, which is suitable for the narrow space characteristics of the integrated reactor. At the same time, the sheath tube is protected in the closed cavity formed by the inner flange, the cylinder and the outer flange, which also ensures the continuous penetration of the shielding layer and the shielding effect is good.

[0071] Embodiment 2:

[0072] The assembly method of the electrical penetration component of the integrated small reactor comprises the following steps:

[0073] The inner flange, cylinder and outer flange made of metal are welded to form a closed cavity;

[0074] The metal shell and conductor, and the glass and / or ceramic insulator are assembled in sequence, and a sealed whole is formed by glass-metal sintering or ceramic-metal brazing, and a metal tail cover is assembled to form a connector;

[0075] The insulated wire is inserted into a metal sheath tube, the wires led out from both ends of the insulated wire are respectively connected to the conductors of the corresponding connector, and the tail cover is connected to the sheath tube to form a feed-through conductor assembly;

[0076] A set number of feed-through conductor assemblies are sequentially passed through the inner flange, the barrel and the outer flange, and are fixed and sealed by a seal;

[0077] The support plate is assembled on the outer sides of the inner flange and the outer flange through the connecting rod, and the anti-rotation mechanism penetrates into the cavity between the hole of the support plate and the connector, and after being fixed, an assembled electrical penetration piece is obtained.

[0078] In this embodiment, the following steps are used to achieve assembly:

[0079] (1) Assemble the inner flange 1, the cylinder 2 and the outer flange 3 made of metal materials and form a closed cavity by welding;

[0080] (2) Assemble the metal shell 431 and conductor 433, and the glass and / or ceramic insulator 434 in sequence, perform glass-metal sintering or ceramic-metal brazing treatment to form a sealed whole, install the metal tail cover 432 to form the connector 43; insert the insulated wire 43 into the metal sheath tube 41, weld the conductors at both ends of the insulated wire 43 to the conductors 433 of the connector 43 at both ends respectively (it can also be crimped, terminated or fixedly connected in other ways), weld the tail cover 432 of the connector 43 to the sheath tube 41 to form the feed-through conductor assembly 4;

[0081] (3) The 12 feed-through conductor assemblies 4 are sequentially passed through the inner flange 1, the cylinder 2, and the outer flange 3, and fixed and sealed by the ferrule assembly 8;

[0082] (4) The support plate 5 is installed parallel to both sides of the inner flange 1 and the outer flange 2 through the connecting rod 7, and fixed by the connecting rod 7;

[0083] (5) The anti-rotation mechanism 6 is inserted into the cavity between the hole 51 of the support plate 5 and the connector 43 and fixed with bolts.

[0084] Steps (1) and (2) are performed in no particular order.

[0085] The above-mentioned electrical penetrations contain several modular feed-through conductor components, which are easy to install, disassemble, operate, identify, repair and replace. The electrical penetrations do not contain any organic materials, have no significant aging mechanism to temperature and radiation, and are suitable for extremely harsh environmental conditions such as high temperature and high radiation; at the same time, the installation interface of the electrical penetrations uses a connector, which can be quickly plugged in or out of the field side connector, and at the same time achieves a sealed and waterproof function, without the need for redundant structures such as wire protection boxes, and is suitable for narrow spaces, flooding and other working conditions; at the same time, it also ensures the continuous penetration of the shielding layer, and the shielding effect is good.

[0086] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electrical penetration piece for an integrated small reactor, characterized in that: It includes an inner flange and an outer flange connected at both ends of the cylinder, a support plate is provided on the side of the inner flange and the outer flange away from the cylinder, and multiple groups of feed-through conductor assemblies are arranged in parallel in a closed cavity formed by the inner flange, the cylinder and the outer flange, and both ends pass through the surface of the support plate; each group of feed-through conductor assemblies is connected to the outer surface of the inner flange and the outer flange through corresponding sealing members, and both ends of each group of feed-through conductor assemblies are connected to the surface of the support plate through corresponding anti-rotation mechanisms.

2. The electrical penetration piece of the integrated small reactor according to claim 1, characterized in that: The inner flange and the outer flange are respectively arranged at two ends of the cylinder, and form a closed cavity after being connected. The inner flange and the outer flange are both provided with a plurality of channels for the feed-through conductor components to pass through.

3. The electrical penetration piece of the integrated small reactor according to claim 1, characterized in that: The seal comprises a ferrule assembly or a welding connection, and sealing is achieved by connecting the outer surface portion of the feed-through conductor assembly passing through the inner flange and the outer flange through the ferrule assembly, or by welding the outer surface portion of the feed-through conductor assembly passing through the inner flange and the outer flange through the welding connection.

4. The electrical penetration piece of the integrated small reactor according to claim 1, characterized in that: The feed-through conductor assembly comprises a sheath tube, an insulated wire is arranged inside the sheath tube, and connectors are arranged at both ends of the insulated wire.

5. The electrical penetration piece of the integrated small reactor according to claim 4, characterized in that: The sheath pipe is connected to the outer surfaces of the inner flange and the outer flange through a sealing member, and the sealing member is located between the inner flange and the support plate, and between the outer flange and the support plate.

6. The electrical penetration piece of the integrated small reactor according to claim 4, characterized in that: The connector includes a shell and a tail cover, one end of the tail cover is connected to the sheath tube and the other end is connected to the shell, one end of the insulated wire is inserted into the tail cover and fixed, and the led-out insulated wire passes through the insulator and is connected to the conductor inside the shell, and the insulator is located between the shell and the tail cover.

7. The electrical penetration piece of the integrated small reactor according to claim 6, characterized in that: The outer circumferential side of the tail cover cooperates with the anti-rotation mechanism through a plurality of limiting members.

8. The electrical penetration piece of the integrated small reactor according to claim 1, characterized in that: The support plate is arranged in parallel on the outside of the inner flange and the outer flange, and is connected to the corresponding flange through a connecting rod. A plurality of channels for the feed-through conductor assembly to pass through are provided on the support plate, and the circumferential outer side of the connector of the feed-through conductor assembly is connected to the channel on the support plate through an anti-rotation mechanism.

9. The electrical penetration piece of the integrated small reactor according to claim 1, characterized in that: The anti-rotation mechanism is located on the inner surface of the channel of the support plate, and is enclosed on the outer side of the circumference of the tail cover by at least two anti-rotation blocks. A limiting groove is provided on the inner side of the circumference of the anti-rotation block, and a limiting piece is provided on the outer side of the circumference. The limiting groove on the inner side of the circumference cooperates with the limiting piece of the connector tail cover, and the limiting piece on the outer side of the circumference cooperates with the limiting groove on the inner surface of the channel of the support plate.

10. A method for assembling an electrical penetration piece of an integrated small reactor according to any one of claims 1 to 9, characterized in that: The following steps are involved: The inner flange, cylinder and outer flange made of metal are welded to form a closed cavity; The metal shell and conductor, and the glass and / or ceramic insulator are assembled in sequence, and a sealed whole is formed by glass-metal sintering or ceramic-metal brazing, and a metal tail cover is assembled to form a connector; The insulated wire is inserted into a metal sheath tube, the wires led out from both ends of the insulated wire are respectively connected to the conductors of the corresponding connector, and the tail cover is connected to the sheath tube to form a feed-through conductor assembly; A set number of feed-through conductor assemblies are sequentially passed through the inner flange, the barrel and the outer flange, and are fixed and sealed by a seal; The support plate is assembled on the outer sides of the inner flange and the outer flange through the connecting rod, and the anti-rotation mechanism penetrates into the cavity between the hole of the support plate and the connector, and after being fixed, an assembled electrical penetration piece is obtained.

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