CN110993250A - High-temperature-resistant electromagnetic coil for control rod driving mechanism of nuclear power station - Google Patents
High-temperature-resistant electromagnetic coil for control rod driving mechanism of nuclear power station Download PDFInfo
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- CN110993250A CN110993250A CN201911043558.7A CN201911043558A CN110993250A CN 110993250 A CN110993250 A CN 110993250A CN 201911043558 A CN201911043558 A CN 201911043558A CN 110993250 A CN110993250 A CN 110993250A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F5/00—Coils
- H01F5/02—Coils wound on non-magnetic supports, e.g. formers
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Abstract
The invention provides a high-temperature resistant electromagnetic coil for a control rod driving mechanism of a nuclear power station, which comprises a ceramic framework, a coil winding and a magnetic yoke, wherein the coil winding is wound outside the ceramic framework, and a casting material is poured on the coil winding and is used for filling a gap of the coil winding; a plurality of radiating blades arranged at intervals are arranged outside the magnetic yoke, the coil winding is installed in the magnetic yoke, and a potting layer is encapsulated between the coil winding and the magnetic yoke and used for filling a gap between the magnetic yoke and the coil winding. The high-temperature-resistant electromagnetic coil for the control rod driving mechanism of the nuclear power station can greatly improve the heat-resistant grade of the electromagnetic coil, so that a forced ventilation cooling system is omitted.
Description
Technical Field
The invention relates to the technical field of control rod driving mechanisms of nuclear power stations, in particular to a high-temperature-resistant electromagnetic coil for the control rod driving mechanism of the nuclear power station.
Background
The control rod assemblies of the nuclear reactor are arranged in the reactor core and are inserted into the fuel assemblies, and the control rod assemblies are driven to be positioned in the height direction of the reactor core through the step lifting and downward inserting actions of the control rod driving mechanism so as to realize the starting, power regulation, normal shutdown and accident shutdown of the reactor. The electromagnetic coils in the control rod driving mechanism provide power for the operation of the control rod driving mechanism, the electromagnetic coils are powered on and off according to a certain time sequence to generate a specific electromagnetic field, and the driving hook grabbing part is hooked in and opened according to a specified sequence, so that the driving rod part and the control rod assembly connected with the driving rod part are driven to move up and down, and hold or drop rods. When the control rod driving mechanism operates, the electromagnetic coil generates heat, one part of the heat is from resistance heat generated when the electromagnetic coil is electrified, and the other part of the heat is from heat radiation of high-temperature water in a loop. Because a large amount of non-metallic electrical materials are used in the electromagnetic coil, the heat resistance of the electromagnetic coil is limited, and the temperature resistance grade of the electromagnetic coil of the control rod driving mechanism of most international pressurized water reactor nuclear power stations can only reach 200 at present.
In order to cool the coils, a dedicated forced air cooling system is provided at the top of the reactor, which, while providing cooling for the coil components, has the following disadvantages: (1) the forced ventilation cooling device occupies a large amount of space of the reactor top, so that the reactor top structure is complex, the difficulty of the arrangement of the reactor top structure and the laying of cables is increased, the system needs to be maintained during the operation of the nuclear power station, and the operation cost is increased; (2) once the forced draft cooling system fails, the temperature of the coil will rise rapidly in a short time, which may lead to coil burnout and emergency unplanned reactor shutdown accidents, affecting the reliability and economy of the plant operation.
Therefore, how to improve the high temperature resistance grade of the electromagnetic coil and cancel a forced ventilation cooling system on the top of the pile becomes a problem to be solved urgently at present.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the high-temperature resistant electromagnetic coil for the control rod driving mechanism of the nuclear power station, which can greatly improve the heat resistance grade of the electromagnetic coil so as to cancel a forced ventilation cooling system at the top of a reactor.
The technical scheme of the invention for solving the technical problems is as follows: provided is a high temperature resistant electromagnetic coil for a control rod drive mechanism of a nuclear power plant, comprising:
a ceramic skeleton;
the coil winding is wound outside the ceramic framework, and pouring materials are poured on the coil winding and used for filling gaps of the coil winding;
the coil winding is installed in the magnetic yoke, and a potting layer is encapsulated between the coil winding and the magnetic yoke and is used for filling gaps between the magnetic yoke and the coil winding.
In the high temperature resistant electromagnetic coil of the present invention, the yoke includes:
the main body part is of a cylindrical structure with openings at two ends, and each radiating blade extends along the axial direction of the main body part and is arranged outside the main body part;
the cover plate is of an annular structure and is installed on the end portion of the main body portion through bolt connection, and a leading-out opening used for penetrating the coil winding is further formed in the cover plate.
In the above high temperature resistant electromagnetic coil of the present invention, the coil winding includes:
the winding wire is wound outside the ceramic framework according to the set number of layers and the number of turns, and two ends of the winding wire form leading-out ends;
the number of the lead wires is two, one ends of the two lead wires are respectively connected with the two lead-out ends, the other ends of the two lead wires penetrate through the lead-out openings and extend out of the cover plate, and the potting layer is potted between the lead wires and the lead-out openings.
In the high temperature resistant electromagnetic coil of the present invention, the ceramic frame includes:
the winding wire winding device comprises a framework body, a winding wire winding device and a winding wire winding device, wherein the framework body is of a cylindrical structure with openings at two ends, and framework limiting parts are arranged at two ends of the outer wall surface of the framework body in a radially outward extending mode and used for limiting the winding wire wound on the framework body;
the framework lead part is arranged on the other side face of the framework limiting part opposite to the framework body, and one end of the framework lead part extends into the lead-out opening and is used for guiding the lead wire to enter the lead-out opening.
In the high-temperature resistant electromagnetic coil, the casting material comprises quartz sand and insulating paint, the quartz sand is filled in the coil winding, the coil winding filled with the quartz sand is wholly soaked in the insulating paint, and the insulating paint is cured by baking.
In the high-temperature resistant electromagnetic coil, the potting layer is made of resin material.
In the high-temperature resistant electromagnetic coil, the winding wire comprises a wire core formed by a nickel-plated round copper wire, a glass fiber coated outside the wire core, a mica tape wrapping coated outside the glass fiber, and an insulating paint layer coated outside the mica tape wrapping.
In the high-temperature resistant electromagnetic coil, the winding wire includes a wire core made of a nickel-plated round copper wire, and a ceramic insulating layer coated outside the wire core.
In the high-temperature resistant electromagnetic coil, the lead wire includes a wire core formed by a plurality of nickel wires, a mineral insulating layer coated outside the wire core, an alloy layer coated outside the mineral insulating layer, and a steel wire braided protective layer coated outside the alloy layer, and the mineral insulating layer is respectively connected with the wire core and the alloy layer in a sintering manner.
In the high-temperature resistant electromagnetic coil, the insulating paint is organic silicon paint.
The high-temperature resistant electromagnetic coil for the control rod driving mechanism of the nuclear power station has the following beneficial effects:
(1) the electromagnetic coil is made of a ceramic framework, the ceramic framework has good heat resistance and heat insulation performance, heat radiation of a loop of high-temperature water to the electromagnetic coil can be reduced, and the heat resistance grade of the electromagnetic coil is improved; meanwhile, the ceramic framework has stable size, no magnetism, electric insulation, high strength, fracture resistance and easy processing, and meets the special requirements of high temperature resistance, irradiation resistance and long service life of the control rod driving mechanism electromagnetic coil;
(2) the radiating blades are arranged outside the magnet yoke of the electromagnetic coil, so that the radiating area of the magnet yoke can be increased, and natural ventilation and radiating air channels are formed among the radiating blades, thereby enhancing the radiating effect and improving the heat-resisting grade of the electromagnetic coil;
(3) according to the electromagnetic coil, the coil winding is wound on the ceramic framework, and the high-temperature-resistant and irradiation-resistant casting material, the potting layer and the magnetic yoke are wrapped outside the coil winding, so that the stability and the heat dissipation performance of the overall structure are ensured, the heat-resistant grade of the electromagnetic coil can be greatly improved, and the forced ventilation cooling system is omitted.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a cross-sectional schematic view of an electromagnetic coil shown in accordance with an exemplary embodiment;
FIG. 2 is a schematic diagram of a solenoid coil shown in accordance with an exemplary embodiment;
FIG. 3 is a schematic diagram illustrating the structure of a ceramic backbone in an electromagnetic coil, according to an exemplary embodiment.
Detailed Description
In order that those skilled in the art will more clearly understand the present invention, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a cross-sectional schematic view of an electromagnetic coil shown in accordance with an exemplary embodiment, as shown in FIG. 1, including:
a ceramic skeleton 10;
the coil winding 20 is wound outside the ceramic framework 10, and pouring materials are poured on the coil winding 20 and used for filling gaps of the coil winding 20;
a yoke 30, a plurality of radiating fins 50 arranged at intervals are arranged outside the yoke 30; the coil winding 20 is mounted in the yoke 30, and a potting layer 40 is potted between the coil winding 20 and the yoke 30 to fill a gap between the yoke 30 and the coil winding 20.
In the above embodiment, the ceramic frame 10 has very good heat resistance and good heat insulation performance, and can reduce heat radiation of a loop of high-temperature water inside the coil to the electromagnetic coil; meanwhile, the ceramic framework has the advantages of being stable in size, non-magnetic, electrically insulating, high in strength, resistant to fragmentation, easy to machine and the like, and meets the special requirements of high temperature resistance, radiation resistance and long service life of the control rod driving mechanism electromagnetic coil.
Preferably, the ceramic skeleton 10 is made of a ceramic material or a ceramic matrix composite material, which has been widely used in aerospace, energy, metallurgy, and other industries, and has high reliability.
On the other hand, the heat dissipating blades 50 are disposed on the yoke 30, so that the surface area of the yoke 30 can be increased, and air passages for natural ventilation and heat dissipation are formed between the heat dissipating blades 50 at intervals, thereby greatly improving the heat dissipating efficiency and the heat resistance grade of the electromagnetic coil.
Fig. 2 is a schematic structural diagram of an electromagnetic coil according to an exemplary embodiment, and referring to fig. 1 and 2, a yoke 30 includes a main body 31 and a cover plate 32, wherein the main body 31 is a cylindrical structure with two open ends, and each heat dissipating fin 50 is disposed outside the main body 31 along an axial direction of the main body 31; the cover plate 32 is of an annular structure, the cover plate 32 is mounted on the end portion of the main body portion 31 through bolt connection, and the cover plate 32 is further provided with an outlet 321 for passing through the coil winding 20.
In the above embodiment, the yoke 30 is composed of the body 31 and the cover 32, and the body 31 and the cover are connected by bolts, so that each coil can be assembled and disassembled independently. In the prior art, the coils are grouped into three groups, and the coils share the magnetic yoke between every two coils, so that the magnetic cross between the coils is large, the coils are required to be assembled and disassembled in sequence from top to bottom, and the assembly, the disassembly and the maintenance of the single coil cannot be carried out.
The coil winding 20 comprises a winding wire 21 and a lead wire 22, wherein the winding wire 21 is wound outside the ceramic framework 10 according to the set number of layers and the number of turns, and two ends of the winding wire 21 form lead-out ends; the number of the lead wires 22 is two, one end of each of the two lead wires 22 is connected to the two lead terminals of the winding wire 21, the other end of each of the two lead wires 22 extends out of the cover plate 32 through the lead-out opening 321, and a potting layer 40 is potted between each of the lead wires 22 and the corresponding lead-out opening 321 to fill a gap between each of the lead wires 22 and the corresponding lead-out opening 321.
In order to improve the heat resistance of the electromagnetic coil, high temperature resistant wires are used for the winding wire 21 and the lead wire 22. Preferably, the winding wire 21 includes a wire core made of a high temperature resistant nickel-plated round copper wire, a glass fiber covered outside the wire core, a mica tape wrapping covered outside the glass fiber, and an insulating paint layer coated outside the mica tape wrapping. Wherein, the insulating paint layer can be made of high-temperature-resistant organic silicon paint.
In another embodiment, the winding wire 21 includes a core made of a high temperature-resistant nickel-plated round copper wire, and a ceramic insulating layer coated outside the core.
The lead wire 22 is an armored cable, and specifically includes a wire core formed by a plurality of high temperature resistant nickel wires, a mineral insulating layer coated outside the wire core, a high temperature resistant alloy layer coated outside the mineral insulating layer, and a steel wire braided protective layer coated outside the alloy layer. In a preferred embodiment of the armored cable, the mineral-filled insulating layer is silicon oxide, the alloy sleeve is nickel-based alloy, and the mineral-filled insulating layer is respectively connected with the high-temperature-resistant nickel wire and the alloy sleeve by high-temperature sintering. The cable is applied to the industries of aerospace and the like, and has strong reliability.
Fig. 3 is a schematic structural diagram of a ceramic bobbin in an electromagnetic coil according to an exemplary embodiment, and as shown in fig. 1 and fig. 3, a ceramic bobbin 10 includes a bobbin body 11, a bobbin limiting portion 12, and a bobbin lead portion 13, the bobbin body 11 is a cylindrical structure with openings at two ends, and the bobbin limiting portion 12 is radially and outwardly extended from two ends of an outer wall surface of the bobbin body 11 and is used for limiting a winding wire 21 wound on the bobbin body 11; the framework lead part 13 is arranged on the other side surface of the framework limiting part 12 opposite to the framework body 11, and one end of the framework lead part 13 extends into the leading-out opening 321 and is used for guiding the leading wire 22 to enter the leading-out opening 321. The ceramic framework 10 is simple and practical in structural design, and the coil winding 20 can be replaced conveniently; preferably, the framework body 11, the framework limiting part 12 and the framework lead part 13 are integrally formed, so that the processing and the manufacturing are convenient.
In order to further improve the heat resistance of the electromagnetic coil, the casting material includes quartz sand and insulating varnish, the quartz sand is filled in the coil winding 20, the quartz sand filled coil winding is entirely impregnated with the insulating varnish, and is cured by baking. Preferably, the insulating paint is high-temperature-resistant organic silicon paint.
The specific implementation process comprises the following steps: winding the winding wire 21 on the ceramic framework 10 according to the specified number of layers and turns; after the winding wire 21 is finished, subtracting the redundant winding wire outlet, and connecting the lead wire 22 to form a coil winding 20; placing the coil winding 20 on a mold and a vibration table for sand filling; after the sand filling is completed, the coil winding 20 is wholly impregnated with the insulating paint, and through impregnation and baking, the high-temperature-resistant insulating paint fills the gaps inside the coil and bonds the wires and the sand into a closed whole.
In order to further improve the heat resistance grade of the electromagnetic coil, the potting layer 40 is made of a resin material, which can improve the sealing performance of the whole coil winding 20, isolate oxygen and moisture, and prevent the oxygen and moisture from damaging the insulating material inside the coil winding 20 at high temperature; meanwhile, the potting layer 40 can attach the outer surface of the coil winding 20 to the yoke 30, eliminate an air gap between the outer surface of the coil winding and the yoke, and improve the heat dissipation of the coil. It should be noted that the heat conductivity coefficient of air is very small, which is equivalent to that of a heat insulating layer, and if an air gap exists between the coil winding and the magnetic yoke, the outward heat transfer effect of the heat generated inside the coil is greatly reduced.
In summary, according to the high-temperature resistant electromagnetic coil for the control rod driving mechanism of the nuclear power station, which is provided by the invention, the coil winding consisting of the ceramic framework and the high-temperature resistant lead is adopted, and the coil winding is wrapped by the high-temperature resistant and radiation resistant casting material, the potting layer and the magnet yoke, so that the heat resistance grade of the electromagnetic coil can be greatly improved, and a forced ventilation cooling system is omitted.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (10)
1. A nuclear power station control rod drive mechanism is with high temperature resistant solenoid, its characterized in that includes:
a ceramic skeleton (10);
the coil winding (20), the coil winding (20) is wound outside the ceramic framework (10), and casting material is poured on the coil winding (20) and is used for filling gaps of the coil winding (20);
the heat dissipation device comprises a magnetic yoke (30), wherein a plurality of heat dissipation blades (50) arranged at intervals are arranged outside the magnetic yoke (30); the coil winding (20) is mounted in the magnetic yoke (30), and a potting layer (40) is potted between the coil winding (20) and the magnetic yoke (30) and used for filling a gap between the magnetic yoke (30) and the coil winding (20).
2. The high temperature resistant electromagnetic coil as set forth in claim 1, wherein said yoke (30) includes:
the main body part (31), the main body part (31) is a cylindrical structure with two open ends, and each radiating blade (50) extends along the axial direction of the main body part (31) and is arranged outside the main body part (31);
the cover plate (32), the cover plate (32) is of an annular structure, the cover plate (32) is installed on the end portion of the main body portion (31) through bolt connection, and the cover plate (32) is further provided with an outlet (321) used for penetrating the coil winding (20).
3. The high temperature resistant electromagnetic coil of claim 2, wherein the coil winding (20) comprises:
the winding wire (21) is wound outside the ceramic framework (10) according to the set number of layers and the number of turns, and two ends of the winding wire (21) form leading-out ends;
the number of the lead wires (22) is two, one end of each of the two lead wires (22) is connected with the two lead-out ends, the other end of each of the two lead wires (22) penetrates through the lead-out opening (321) and extends out of the cover plate (32), and the potting layer (40) is potted between each lead wire (22) and the corresponding lead-out opening (321).
4. The high temperature resistant electromagnetic coil as set forth in claim 3, characterized in that said ceramic former (10) comprises:
the winding wire frame comprises a frame body (11), wherein the frame body (11) is of a cylindrical structure with openings at two ends, and frame limiting parts (12) are arranged at two ends of the outer wall surface of the frame body (11) in an outward extending mode along the radial direction and used for limiting winding wires (21) wound on the frame body (11);
skeleton lead wire portion (13), set up and be in on the another side of the relative skeleton body (11) of the spacing portion of skeleton (12), the one end of skeleton lead wire portion (13) extends to in drawing forth mouth (321), be used for the guide draw wire (22) to get into draw forth mouth (321).
5. The high-temperature resistant electromagnetic coil according to claim 1, wherein the castable includes silica sand filled in the coil winding (20) and an insulating varnish, and the coil winding (20) filled with the silica sand is entirely impregnated with the insulating varnish and cured by baking.
6. The high temperature resistant electromagnetic coil according to claim 1, wherein the potting layer (40) is made of a resin material.
7. The high-temperature-resistant electromagnetic coil is characterized in that the winding wire (21) comprises a wire core made of a nickel-plated round copper wire, a glass wire coated outside the wire core, a mica tape wrapping bag coated outside the glass wire, and an insulating paint layer coated outside the mica tape wrapping bag.
8. The high-temperature-resistant electromagnetic coil as claimed in claim 3, wherein the winding wire (21) comprises a wire core made of a nickel-plated round copper wire, and a ceramic insulating layer covering the outside of the wire core.
9. The high-temperature-resistant electromagnetic coil is characterized in that the lead wire (22) comprises a wire core consisting of a plurality of nickel wires, a mineral insulating layer coated outside the wire core, an alloy layer coated outside the mineral insulating layer, and a steel wire braided protective layer coated outside the alloy layer, wherein the mineral insulating layer is respectively connected with the wire core and the alloy layer in a sintering way.
10. The high temperature resistant electromagnetic coil of claim 5 wherein said insulating varnish is a silicone varnish.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911043558.7A CN110993250A (en) | 2019-10-30 | 2019-10-30 | High-temperature-resistant electromagnetic coil for control rod driving mechanism of nuclear power station |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911043558.7A CN110993250A (en) | 2019-10-30 | 2019-10-30 | High-temperature-resistant electromagnetic coil for control rod driving mechanism of nuclear power station |
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| CN110993250A true CN110993250A (en) | 2020-04-10 |
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| CN201911043558.7A Pending CN110993250A (en) | 2019-10-30 | 2019-10-30 | High-temperature-resistant electromagnetic coil for control rod driving mechanism of nuclear power station |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5588247A (en) * | 1978-12-05 | 1980-07-03 | Matsushita Electronics Corp | Magnet built-in type magnetron |
| KR20000017789A (en) * | 1999-12-09 | 2000-04-06 | 서정열 | Structure of Electric Magnet For Magnetic Separator |
| DE102010035954A1 (en) * | 2010-08-31 | 2012-03-01 | Continental Teves Ag & Co. Ohg | Magnetic coil for solenoid valve, has low-viscous volume controlled elastomer that is filled in cavity that is formed between magnetic wire wound on bobbin, and yoke structure |
| CN103871709A (en) * | 2012-12-11 | 2014-06-18 | 中国核动力研究设计院 | Control coil structure suitable for control rod drive mechanism |
| CN206601998U (en) * | 2017-04-19 | 2017-10-31 | 黄曦雨 | A kind of novel electromagnetic wire coil assembly |
| CN108257761A (en) * | 2018-01-16 | 2018-07-06 | 喻杰 | A kind of manufacturing method of control rod drive mechanism electromagnetic coil assembly and the component |
| CN207663873U (en) * | 2017-09-29 | 2018-07-27 | 黄曦雨 | A kind of control rod drive mechanism control coil that structural strength can be improved |
| CN109360705A (en) * | 2018-10-11 | 2019-02-19 | 深圳中广核工程设计有限公司 | Control rod drive mechanism and its electromagnetic coil |
-
2019
- 2019-10-30 CN CN201911043558.7A patent/CN110993250A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5588247A (en) * | 1978-12-05 | 1980-07-03 | Matsushita Electronics Corp | Magnet built-in type magnetron |
| KR20000017789A (en) * | 1999-12-09 | 2000-04-06 | 서정열 | Structure of Electric Magnet For Magnetic Separator |
| DE102010035954A1 (en) * | 2010-08-31 | 2012-03-01 | Continental Teves Ag & Co. Ohg | Magnetic coil for solenoid valve, has low-viscous volume controlled elastomer that is filled in cavity that is formed between magnetic wire wound on bobbin, and yoke structure |
| CN103871709A (en) * | 2012-12-11 | 2014-06-18 | 中国核动力研究设计院 | Control coil structure suitable for control rod drive mechanism |
| CN206601998U (en) * | 2017-04-19 | 2017-10-31 | 黄曦雨 | A kind of novel electromagnetic wire coil assembly |
| CN207663873U (en) * | 2017-09-29 | 2018-07-27 | 黄曦雨 | A kind of control rod drive mechanism control coil that structural strength can be improved |
| CN108257761A (en) * | 2018-01-16 | 2018-07-06 | 喻杰 | A kind of manufacturing method of control rod drive mechanism electromagnetic coil assembly and the component |
| CN109360705A (en) * | 2018-10-11 | 2019-02-19 | 深圳中广核工程设计有限公司 | Control rod drive mechanism and its electromagnetic coil |
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| Title |
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