Fireproof structure for feed-through end part of electrical penetration equipment of nuclear power unit
By setting a refractory ceramic module, heat shrink tube and ceramic composite belt at the end of the feedthrough of the electrical penetration equipment of the nuclear power unit, the problem of easy damage to the equipment due to harsh environment is solved, and the electrical continuity and anti-radical substance leakage effect is achieved in high temperature and open flame environments.
Patent Information
- Application Number
- CN202411509041.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-28
- Publication Date
- 2025-03-28
AI Technical Summary
The electrical penetration equipment of the nuclear power unit is easily damaged due to the harsh environment in which it is located, and there is a lack of targeted research on the feed-through refractory structure.
A refractory structure is arranged at the feedthrough end of the electrical penetration equipment of the nuclear power unit, including a refractory ceramic module and a heat shrink tube, and the ceramicized composite belt is wound outside the heat shrink tube.
In extreme environments of high temperature and open flames, ensure the electrical continuity of the electrical penetration equipment of the nuclear power unit, prevent the leakage of radioactive substances, and meet the requirements of the VVER-1200 nuclear power unit for the feedthrough fire resistance of the electrical penetration equipment.
Smart Images
Figure CN119724636A_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the technical field of electrical penetration equipment for nuclear power plants, and in particular relates to a refractory structure for a feed-through end of an electrical penetration equipment for a nuclear power plant. Background Art
[0002] The operating performance of the electrical penetration equipment of a nuclear power unit has a direct impact on the safety of the reactor. The electrical penetration equipment is installed on the containment of the nuclear power unit for the penetration and connection of various cables. At the same time, as part of the containment, it constitutes a barrier to prevent the leakage of radioactive materials to ensure the integrity of the pressure boundary.
[0003] Taking the VVER-1200 nuclear power unit as an example, there are nearly two hundred electrical penetration devices installed on the containment of the nuclear power unit. The environment in which some of the electrical penetration devices are located is very harsh. The feedthrough refractory technology in the electrical penetration equipment of the VVER-1200 nuclear power unit is a key technical research and development project for the electrical penetration equipment of the VVER-1200 nuclear power unit. However, there is currently no targeted research on the feedthrough refractory structure. Summary of the invention
[0004] In view of this, an embodiment of the present application is committed to providing a fire-resistant structure at the feedthrough end of the electrical penetration equipment of a nuclear power unit. By setting a fire-resistant structure at the feedthrough end of the electrical penetration equipment of the nuclear power unit, the problem that the existing electrical penetration equipment is easily damaged due to the extremely harsh environment in which it is located is solved.
[0005] The present application provides a refractory structure for a feedthrough end of an electrical penetration device of a nuclear power unit, the refractory structure for a feedthrough end of an electrical penetration device of a nuclear power unit comprising a refractory ceramic module and a heat shrink tube. The refractory ceramic module is used to be attached to a core wire extending from the feedthrough end. The heat shrink tube is sleeved on the outside of the refractory ceramic module.
[0006] In a specific embodiment of the present application, the refractory structure of the feed-through end of the electrical penetration device of the nuclear power unit further includes a ceramic composite tape, and the ceramic composite tape is wound around the outside of the heat shrink tube.
[0007] In a specific embodiment of the present application, the ceramic composite tape is configured to be cured into a ceramic body after being subjected to high temperature or open flame.
[0008] In a specific embodiment of the present application, the refractory ceramic module uses ceramic as the refractory module. The opening arrangement on the refractory ceramic module corresponds to the number of channel cores of the feedthrough, and the distance between adjacent openings of the refractory ceramic module is evenly distributed.
[0009] In a specific embodiment of the present application, the heat shrink tube adopts a nuclear grade heat shrink tube.
[0010] The beneficial effect of the technical solution of the present application is that: on the basis of keeping all the original structures of the electrical penetration equipment unchanged and not affecting the operation of the electrical penetration equipment, an external fire-resistant structure is added to the feedthrough of the electrical penetration equipment, and a fire-resistant structure at the end of the feedthrough is provided, which is mainly composed of a refractory ceramic module and a heat shrink tube. The refractory ceramic module is attached to the outside of the feedthrough. Since the ceramic module is refractory and has high-temperature insulation performance, it serves as an inner fire barrier to ensure that the core wire of the electrical penetration equipment will not be affected by high temperature and open flame. The heat shrink tube is further provided on the outside of the refractory ceramic module, so that the electrical continuity of the electrical penetration equipment of the nuclear power unit can be ensured under the extreme environment of high temperature and open flame, and the normal operation of the core wire of the feedthrough of the electrical penetration equipment under the influence of high temperature and open flame is ensured, and the integrity of the pressure boundary is also ensured to prevent the leakage of radioactive substances, meet the fire resistance requirements of the VVER-1200 nuclear power unit for the feedthrough of the electrical penetration equipment, and solve practical engineering problems. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 Shown is an exploded view of a refractory structure at the feed-through end of an electrical penetration device of a nuclear power unit provided in one embodiment of the present application.
[0012] Figure 2 Shown Figure 1 The illustrated embodiment is a schematic structural diagram of a refractory structure of a feed-through end portion of an electrical penetration device of a nuclear power unit after assembly.
[0013] Figure 3 Shown Figure 1 The illustrated embodiment is a side view of a refractory structure of a feed-through end of an electrical penetration device of a nuclear power unit after assembly.
[0014] Figure 4 Shown Figure 1 The illustrated embodiment is a schematic cross-sectional view of a refractory structure of a feed-through end of an electrical penetration device of a nuclear power unit after assembly.
[0015] Figure 5 Shown is a schematic structural diagram of a refractory ceramic module in a refractory structure at the end of a feed-through of an electrical penetration device of a nuclear power unit provided in one embodiment of the present application. DETAILED DESCRIPTION
[0016] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0017] At least one embodiment of the present application provides a refractory structure for a feed-through end of an electrical penetration device of a nuclear power unit, referring to Figures 1 to 4 The refractory structure of the feed-through end of the electrical penetration equipment of the nuclear power unit includes a refractory ceramic module 2 and a heat shrink tube 3. The refractory ceramic module 2 is used to be attached to the core wire extending from the feed-through end. The heat shrink tube 3 is sleeved on the outside of the refractory ceramic module 2.
[0018] It should be noted that the core wire of the electrical feedthrough extends through the sealing module 1 , and the sealing module 1 is used to ensure the sealing of the feedthrough. The extended core wire passes through the interior of the refractory ceramic module 2 .
[0019] According to the technical solution provided in the embodiment of the present application, on the basis that all the original structures of the electrical penetration equipment remain unchanged and do not affect the operation of the electrical penetration equipment, an external fire-resistant structure is added to the feedthrough of the electrical penetration equipment, and a fire-resistant structure at the feedthrough end is provided, which is mainly composed of a refractory ceramic module and a heat shrink tube. The refractory ceramic module is attached to the outside of the feedthrough. Since the ceramic module is refractory and has high-temperature insulation performance, it serves as an inner fire barrier to ensure that the core wire of the electrical penetration equipment will not be affected by high temperature and open flame. Further, 3 sets of heat shrink tubes are arranged on the outside of the refractory ceramic module 2, so that the electrical continuity of the electrical penetration equipment of the nuclear power unit can be ensured under the extreme environment of high temperature and open flame, and the normal operation of the core wire of the feedthrough of the electrical penetration equipment under the influence of high temperature and open flame is ensured, and the integrity of the pressure boundary is also ensured to prevent the leakage of radioactive substances, meet the fire resistance requirements of the VVER-1200 nuclear power unit for the feedthrough of the electrical penetration equipment, and solve practical engineering problems.
[0020] In at least one embodiment of the present application, the fire-resistant structure of the feed-through end of the electrical penetration device of the nuclear power unit further includes a ceramic composite tape 4, which is wound around the outside of the heat shrink tube 3. In this way, the ceramic composite tape 4 is wound around the outside of the heat shrink tube 3, and the ceramic composite tape 4 serves as the outermost fire barrier, thereby improving the overall tolerance.
[0021] In at least one embodiment of the present application, the ceramic composite tape 4 is configured to solidify into a ceramic body after being affected by high temperature or open flame. In this way, the fire resistance of the electrical penetration device under the influence of high temperature and open flame is further enhanced, ensuring that the electrical penetration device feedthrough can still operate normally even under the influence of high temperature and open flame.
[0022] In at least one embodiment of the present application, reference Figure 5 The refractory ceramic module uses ceramic as a refractory module. The opening arrangement on the refractory ceramic module corresponds to the number of cores of the feedthrough, and the distance between adjacent openings of the refractory ceramic module is evenly distributed. In this way, by setting the opening arrangement of the refractory ceramic module according to the requirements of the number of cores of the feedthrough, and selecting the corresponding refractory ceramic module according to different types of feedthroughs, the versatility of the refractory structure of the feedthrough end on the electrical penetration equipment of the nuclear power unit is improved.
[0023] For example, the feedthrough of a VVER nuclear power unit ranges from single-core to multi-core (up to 43 cores), and the refractory module can be adaptively adjusted according to the different specifications of the feedthrough.
[0024] In at least one embodiment of the present application, the heat shrink tube is a nuclear-grade heat shrink tube, so that the nuclear-grade heat shrink tube is used to fix the ceramic refractory module.
[0025] It should be noted that the combination of the various technical features in the embodiments of the present application is not limited to the combination described in the embodiments of the present application or the combination described in the specific embodiments, and all technical features described in the present application can be freely combined or combined in any way unless there is a contradiction between them.
[0026] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the term "comprising" only indicates that the steps and elements that have been clearly identified are included, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.
[0027] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.
Claims
1. A refractory structure for the feed-through end of an electrical penetration device of a nuclear power unit, characterized in that: Including refractory ceramic modules and heat shrink tubing, The refractory ceramic module is used to be attached to the core wire extending from the feed-through end, and the heat shrink tube is sleeved on the outside of the refractory ceramic module.
2. The refractory structure of the feed-through end of the electrical penetration equipment of a nuclear power unit according to claim 1, characterized in that: Also includes ceramic composite tape, Wherein, the ceramic composite tape is wound around the outside of the heat shrink tube.
3. The refractory structure of the feed-through end of the electrical penetration equipment of a nuclear power unit according to claim 2, characterized in that: The ceramic composite tape is configured to solidify into a ceramic body after being subjected to high temperature or open flame.
4. The refractory structure of the feed-through end of the electrical penetration equipment of a nuclear power unit according to any one of claims 1 to 3, characterized in that: The refractory ceramic module uses ceramic as a refractory module, the arrangement of openings on the refractory ceramic module corresponds to the number of channel cores of the feedthrough one by one, and the distances between adjacent openings of the refractory ceramic module are evenly distributed.
5. The refractory structure of the feed-through end of the electrical penetration equipment of a nuclear power unit according to any one of claims 1 to 3, characterized in that: The heat shrinkable tube is a nuclear grade heat shrinkable tube.