CN112420224A - Locking device and fuel assembly suitable for marine reactor - Google Patents
Locking device and fuel assembly suitable for marine reactor Download PDFInfo
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- CN112420224A CN112420224A CN202011343024.9A CN202011343024A CN112420224A CN 112420224 A CN112420224 A CN 112420224A CN 202011343024 A CN202011343024 A CN 202011343024A CN 112420224 A CN112420224 A CN 112420224A
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- rod guide
- elastic
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- 239000000446 fuel Substances 0.000 title claims abstract description 37
- 230000006835 compression Effects 0.000 claims abstract description 31
- 238000007906 compression Methods 0.000 claims abstract description 31
- 230000007246 mechanism Effects 0.000 claims abstract description 30
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 238000009434 installation Methods 0.000 abstract description 8
- 230000000712 assembly Effects 0.000 description 10
- 238000000429 assembly Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 239000000306 component Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000002567 autonomic effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004992 fission Effects 0.000 description 1
- 230000005251 gamma ray Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003758 nuclear fuel Substances 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
- G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
- G21C3/33—Supporting or hanging of elements in the bundle; Means forming part of the bundle for inserting it into, or removing it from, the core; Means for coupling adjacent bundles
- G21C3/332—Supports for spacer grids
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
- G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
- G21C3/334—Assembling, maintenance or repair of the bundles
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The application relates to a locking device and fuel assembly suitable for marine reactor, it includes: the sleeve is provided with at least two clamping grooves and is used for penetrating through the lower support plate of the reactor core; a first header provided on the sleeve for ballasting on an upper surface of the core lower support plate; the locking mechanism is positioned in the sleeve and comprises an elastic opening and closing assembly corresponding to the clamping groove, part of the elastic opening and closing assembly extends out of the clamping groove and is used for supporting the lower surface of the lower supporting plate of the reactor core; the driving mechanism is assembled in the sleeve and comprises a control rod guide pipe and an elastic compression assembly, and the control rod guide pipe is connected with the locking mechanism; the control rod guide tube is used for moving downwards to compress the elastic compression assembly and drive the part of the elastic opening and closing assembly extending out of the clamping groove to be retracted into the sleeve. Through setting up locking device in fuel assembly, realize fuel assembly's whole reloading to dismantle and the installation is quick, saved the time of reloading.
Description
Technical Field
The application relates to the field of design of nuclear fuel assemblies of marine reactors, in particular to a locking device and a fuel assembly suitable for marine reactors.
Background
The reactor core is a core component of a reactor at present, and not only needs to meet the physical, thermal and hydraulic requirements of the reactor, but also needs to meet the operating performance requirements of nuclear power facilities; the fuel assembly is the main body of the reactor core, realizes fission reaction, releases nuclear energy, and works under the conditions of high temperature, high pressure, long-term scouring corrosion of boron-containing water, hydraulic vibration, strong neutron flow, gamma-ray irradiation and the like; its working performance has a significant impact on the safety, reliability and economy of reactor operation.
In some related arts, fuel assemblies of onshore nuclear power plants are mounted on a lower core support plate of a lower internals, and are positioned and fixed only by gravity, and can meet the requirement of safe operation of a reactor. However, in the use environment of marine reactors at sea, the reactor core is always in a state of ship inclination and ship sway, and the installation reliability of the fuel assemblies cannot be ensured only by gravity.
In other related technologies, for the use environment of marine reactors at sea, an upper fuel assembly compression plate is added to a lower reactor internals, and the upper compression plate is connected with the fuel assemblies through a plurality of fixing pieces, so that the whole fuel assembly is compressed and fixed. However, when loading and unloading materials, the upper pressing plate needs to be disassembled firstly to be separated from the fuel assembly, then the fuel assembly is replaced, and due to the arrangement of the plurality of fixing pieces for fixing the upper pressing plate, the disassembly is inconvenient, so that the operation steps and the operation time for loading and unloading materials are increased, and the operation economy of the reactor is reduced; meanwhile, the fuel assemblies are easy to overturn, and the requirements on stability, reliability and safety of a single fuel assembly in the offshore autonomous refueling process cannot be met.
Disclosure of Invention
The embodiment of the application provides a locking device and fuel assembly suitable for marine reactor to solve among the prior art because the inconvenient dismantlement of last pressure strip, increased the problem of refueling time.
In a first aspect, there is provided a locking device suitable for use in a marine reactor, comprising:
the sleeve is provided with at least two clamping grooves and is used for penetrating through the lower supporting plate of the reactor core;
a first nozzle provided on the sleeve and ballasted on an upper surface of the lower support plate of the core;
the locking mechanism is positioned in the sleeve and comprises an elastic opening and closing component corresponding to the clamping groove; the elastic opening and closing assembly part extends out of the clamping groove and is used for supporting the lower surface of the lower support plate of the reactor core;
the driving mechanism is assembled in the sleeve and comprises a control rod guide pipe and an elastic compression assembly, and the control rod guide pipe is connected with the locking mechanism; the control rod guide tube is used for moving downwards to compress the elastic compression assembly and drive the part of the elastic opening and closing assembly extending out of the clamping groove to be retracted into the sleeve.
In some embodiments, the resilient opening and closing assembly comprises:
a positioning hook rotatably connected to the control rod guide tube;
and one end of the elastic sheet is connected to the control rod guide pipe, and the other end of the elastic sheet is used for pushing the positioning hook, so that the positioning hook part extends out of the clamping groove.
In some embodiments, the locking mechanism further comprises a linking bracket removably coupled to the control rod guide tubes, and the resilient opening and closing assembly is indirectly coupled to the control rod guide tubes via the linking bracket.
In some embodiments, the part of the positioning hook extending out of the clamping groove is provided with a supporting part attached to the lower surface of the lower support plate of the reactor core.
In some embodiments, a limit part is arranged on one side of the positioning hook close to the control rod guide tube, and the limit part is used for limiting the rotation angle of the positioning hook.
In some embodiments, the resilient compression assembly is located above the locking mechanism, the resilient compression assembly comprising:
the first limiting table is connected to the inner wall of the sleeve;
a second limit stop connected to the control rod guide tube;
and the elastic piece is sleeved on the control rod guide tube and is positioned between the first limiting table and the second limiting table.
In some embodiments, the resilient compression assembly comprises:
the third limiting table is positioned at the lower end of the sleeve;
and the elastic piece is positioned in a space between the third limiting table and the locking mechanism.
In some embodiments, the resilient member is a spring.
In some embodiments, the bottom wall of the clamping groove is an inclined surface, and the elastic opening and closing component is provided with an inclined part matched with the inclined surface
In a second aspect, there is provided a fuel assembly adapted for use in a marine reactor, comprising:
a locking device suitable for a marine reactor; and the number of the first and second groups,
a second socket disposed at a top of the sleeve;
a lattice disposed on the sleeve and between the first and second headers, the lattice for housing fuel rods.
The beneficial effect that technical scheme that this application provided brought includes:
the embodiment of the application provides a locking device suitable for a marine reactor, wherein a clamping groove is formed in a sleeve, a locking mechanism is arranged in the sleeve, and an elastic opening and closing assembly of the locking mechanism is used for extending out of the clamping groove to support the lower surface of a lower support plate of a reactor core in a normal state; the sleeve is also provided with a first pipe seat, and the first pipe seat is ballasted on the upper surface of the lower reactor core supporting plate, so that the sleeve is stably arranged on the lower reactor core supporting plate; in addition, a control rod guide pipe and an elastic compression assembly are arranged in the sleeve, when the rod guide pipe is controlled by a lower pressure, the elastic compression assembly is compressed, the part of the elastic opening and closing assembly, which extends out of the clamping groove, is retracted into the sleeve, and at the moment, the sleeve and the reactor core lower support plate can be separated for material replacement; when the downward pressure of the control rod guide pipe is removed, the elastic compression assembly resets, and the elastic opening and closing assembly extends out of the clamping groove again to support the lower surface of the lower support plate of the reactor core, so that the sleeve can be stably connected to the lower support plate of the reactor core; when the control rod guide tube is disassembled, only downward pressure is required to be applied to the control rod guide tube, so that the disassembly is convenient and quick; therefore, the disassembly speed is high, and the operation steps and the operation time in the material changing process are reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a fuel assembly provided by an embodiment of the present application;
fig. 2 is a schematic structural diagram of a locking device provided in an embodiment of the present application;
FIG. 3 is an enlarged schematic view of a point A in FIG. 1 according to an embodiment of the present disclosure;
fig. 4 is an enlarged schematic view at B in fig. 2 according to an embodiment of the present application.
In the figure: 1. a sleeve; 10. a card slot; 2. a reactor core lower supporting plate; 3. a first stem; 4. a drive mechanism; 40. a control rod guide tube; 41. a resilient compression assembly; 411. a first limit table; 412. a second limit table; 413. an installation space; 414. an elastic member; 5. a locking mechanism; 50. an elastic opening and closing component; 500. a positioning hook; 501. a spring plate; 502. a holding portion; 503. a limiting part; 51. connecting a bracket; 510. a threaded connection; 511. a connecting nail; 512. an I-shaped mounting portion; 5. a first stem; 6. a second stem; 7. a framework; 8. and (4) fuel rods.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides a locking device suitable for marine reactor, and the problem of reloading time is increased because the inconvenient dismantlement of last pressure strip among the correlation technique can be solved.
Referring to fig. 1, 2 and 3, a locking device for a marine reactor includes a sleeve 1, a first pipe seat 3, a locking mechanism 5 and a driving mechanism 4.
The first pipe seat 3 is placed and ballasted on the upper surface of the reactor core lower supporting plate 2 and fixedly connected to the outer surface of the lower part of the sleeve 1, at least two symmetrical clamping grooves 10 are arranged on the sleeve 1, and the lower part of the sleeve 1 is used for penetrating through the reactor core lower supporting plate 2 to provide an installation space for the locking mechanism 5 and the driving mechanism 4.
The locking mechanism 5 is located inside the sleeve 1, and includes an elastic opening and closing component 50 corresponding to the slot 10, and the elastic opening and closing component 50 partially extends out of the slot 10 and is used for supporting the lower surface of the lower support plate 2 of the reactor core, and at this time, the locking state of the locking mechanism 5 is also the structural form of the locking device in the normal state.
The driving mechanism 4 is also positioned in the interior of the sleeve 1 and comprises a control rod guide tube 40 and an elastic compression assembly 41, wherein the control rod guide tube 40 is of a cylindrical structure and is connected with the locking mechanism 5; wherein the control rod guide tube 40 is used to move downwards to compress the elastic compression assembly 41 and to drive the part of the elastic opening and closing assembly 50 extending out of the bayonet 10 to retract into the sleeve 1, as follows:
when the locking device is required to be installed and connected with the lower reactor core support plate 2, the sleeve 1 is dropped down and penetrates through the lower reactor core support plate 2 until the first nozzle 3 is ballasted on the upper surface of the lower reactor core support plate 2; when the sleeve 1 is installed, the control rod guide tubes 40 are pressed downwards, the control rod guide tubes 40 move downwards, the elastic opening and closing assembly 50 moves downwards along with the downward movement, the elastic compression assembly 41 is compressed, meanwhile, the elastic opening and closing assembly 50 is pressed by the sleeve 1, so that the part of the elastic opening and closing assembly 50 extending out of the clamping groove 10 is retracted into the sleeve 1, and the sleeve 1 can penetrate through the reactor core lower support plate 2 to be installed; when the downward pressure of the control rod guide tubes 40 is removed after the first nozzle 3 is ballasted on the upper surface of the core lower support plate 2, the elastic compression assemblies 41 are reset, and the elastic opening and closing assemblies 50 are extended out of the slots 10 again to support the lower surface of the core lower support plate 2, so that the sleeve 1 can be stably connected to the core lower support plate 2.
The upper surface and the lower surface of the lower support plate 2 of the reactor core are respectively ballasted and supported through the elastic opening and closing assembly 50 and the first pipe seat 3, so that the sleeve 1 can be stably installed on the lower support plate 2 of the reactor core.
When the locking device and the reactor core lower supporting plate 2 need to be detached and separated, and the control rod guide tubes 40 are pressed downwards, the control rod guide tubes 40 move downwards, the elastic opening and closing assembly 50 moves downwards along with the control rod guide tubes, the elastic compression assembly 41 is compressed, and meanwhile, the elastic opening and closing assembly 50 is pressed by the sleeve 1, so that the part of the elastic opening and closing assembly 50 extending out of the clamping groove 10 is retracted into the sleeve 1; at this time, the sleeve 1 can be lifted upwards to be separated from the lower support plate 2 of the reactor core, and the replacement can be carried out.
With the structure, when the sleeve 1 needs to be installed and disassembled, only the control rod guide tube 40 needs to be pressed down and the sleeve 1 needs to be moved, a complex disassembling step is not needed, and the time is short; and the installation position of the sleeve 1 on the lower support plate 2 of the reactor core is accurate while ensuring the quick installation.
As shown in fig. 3, in some preferred embodiments, the elastic opening and closing assembly 50 may be a stopper having elasticity and disposed on the control rod guide tube 40 in an inclined manner, which can achieve the above-mentioned object, but the elastic stopper generates a large friction force with the sleeve when compressed, so that it is inconvenient to press down the control rod guide tube 40, and thus the following structure is proposed:
the elastic opening and closing assembly 50 comprises a positioning hook 500 and an elastic sheet 501, the positioning hook 500 is rotatably connected to the control rod guide tube 40 through a pin, and the positioning hook 500 can rotate around the pin; one end of the elastic sheet 501 is fixedly connected to the control rod guide tube 40, and the other end of the elastic sheet is used for always pushing the positioning hook 500, so that the positioning hook 500 extends out of the clamping groove 10; the other end of the elastic sheet 501 can be connected or disconnected with the positioning hook 500, as long as the positioning hook 500 is enabled to rotate and can extend out of the clamping groove 10 under the elastic force of the elastic sheet 501, in this way, the positioning hook 500 is supported by the elastic sheet 501, when the positioning hook 500 descends and is pressed by the sleeve 1, the elastic sheet 501 is compressed, the positioning hook 500 can rotate quickly, the positioning hook 500 does not generate large friction force when moving in the sleeve 1, and the abrasion is small; moreover, the requirement on the elastic property of the elastic sheet 501 is low; in addition, the positioning hook 500 is not made of elastic material, so that the supporting force is more stable; thereby facilitating movement and opening and closing of the resilient opening and closing member 50 and improving the life span thereof.
In some preferred embodiments, in order to facilitate the installation of the elastic opening and closing assembly 50 in the thimble 1, a connecting bracket 51 is additionally arranged, the connecting bracket 51 is detachably connected with the control rod guide tube 40, and the elastic opening and closing assembly 50 is indirectly connected with the control rod guide tube 40 through the connecting bracket 51, specifically:
the connecting bracket 51 comprises a threaded connecting part 510, a connecting nail 511 and an I-shaped mounting part 512, wherein an external thread is arranged on the threaded connecting part 510, an internal thread is arranged at the lower end of the control rod guide tube 40, the threaded connecting part 510 is connected with the control rod guide tube 40 through the internal thread and the external thread, the I-shaped mounting part 512 is connected below the threaded connecting part 510, two symmetrical mounting blocks are arranged below the I-shaped mounting part 512 and used for mounting the positioning hook 500, and the two mounting blocks are matched with the inner diameter of the sleeve 1; the connecting nail 511 is disposed on the i-shaped mounting portion 512, and is used for fixedly connecting one end of the elastic piece 501 to the i-shaped mounting portion 512.
Further, the part of the positioning hook 500 extending out of the clamping groove 10 is provided with a supporting part 502 attached to the lower surface of the lower support plate 2 of the reactor core, which ensures that the positioning hook 500 is stressed uniformly when supporting the lower support plate 2 of the reactor core.
Furthermore, in order to prevent the positioning hook 500 from rotating at an excessively large angle and make the amount of the protruding part difficult to determine, a limiting part 503 is arranged at one end of the positioning hook 500 close to the i-shaped mounting part 512, and the limiting part 503 is attached to the i-shaped mounting part 512; when the positioning hook 500 is pushed down by the spring plate 501 to rotate, extends out of the clamping groove 10 and contacts the reactor core lower supporting plate 2 in place, the limiting part 503 is attached to the i-shaped mounting part 512 at the moment to limit the rotation of the positioning hook 500.
In some preferred embodiments, the resilient compression assembly 41 is arranged in two ways:
as shown in fig. 4, in the first embodiment, the elastic compression assembly 41 is located above the locking mechanism 5, the elastic compression assembly 41 includes a first limit stage 411, an elastic member 414 and a second limit stage 412, the first limit stage 411 is connected to the inner wall of the thimble 1, the second limit stage 412 is connected to the control rod guide tube 40, and the elastic member 414 is disposed in the installation space 413 formed by the second limit stage 412, the first limit stage 411 and the control rod guide tube 40, and may be sleeved on the outer surface of the control rod guide tube 40 or disposed on both sides thereof.
Secondly, the elastic compression assembly 41 is located below the locking mechanism 5, the elastic compression assembly 41 comprises a third limit stop and an elastic member 414, the third limit stop is arranged on the inner wall of the lower end of the sleeve 1, and the elastic member 414 is located in a space between the third limit stop and the locking mechanism 5.
Through the two forms, the control rod guide pipe 40 is provided with upward pre-tightening force, and the structure is simple.
Further, the elastic member 414 may be a spring, which may have good mechanical properties and is resistant to high temperature.
In some preferred embodiments, two slots 10 are symmetrically disposed, the number of the slots 10 may also be multiple, and the positioning hooks 500 are also correspondingly disposed, the slots 10 are elongated and matched with the positioning hooks 500, and are opened along the axial direction of the sleeve 1, and the bottom walls of the slots 10 are inclined surfaces, and the elastic opening and closing component 50 is provided with inclined portions matched with the inclined surfaces to facilitate the retraction of the positioning hooks 500 into the sleeve 1.
Referring to fig. 1-4, a fuel assembly for a marine reactor includes the above locking device, a second stem 6 is disposed on the top of a sleeve 1, a grid 7 is disposed on the sleeve 1, the grid 7 is also disposed between the first stem 3 and the second stem 6, the grid 7 is used for placing fuel rods 8, and the fuel rods 8 are installed and fixed by the grid 7 arranged at equal intervals and uniformly distributed around the locking device.
The fuel assembly utilizes a locking device, fuel rods 8 placed on a grid 7 can be stably placed on a reactor core lower supporting plate 2 through a positioning hook 500 and a first tube seat 3, so that the influence of the marine use environment is avoided, wherein the fuel rods 8 cannot fall off and overturn when shaking due to the arrangement of the first tube seat 3 and a second tube seat 6; need not to set up the device that compresses tightly alone, make locking device and fuel assembly as an organic whole, carry out whole reloading, can be convenient load and unload the material operation to single fuel assembly, created the advantage for marine autonomic reloading.
Further, the first nozzle 3 is ballasted on the lower support plate 2 of the core, and also enhances the connection strength between the fuel assembly and the lower support plate 2 of the core, increases the contact area, and is more stable.
Furthermore, the second pipe seat 6 is provided with a mounting hole matched with the top of the sleeve 1, the top of the sleeve 1 is provided with a connecting part matched with the mounting hole,
furthermore, when the locking device is disassembled by utilizing the steps during material changing, the fuel rods 8 on the locking device are also disassembled together, the locking device and the fuel rods 8 are not required to be separated, the integral material changing is realized, and the material changing time is reduced.
The first nozzles 3, the grids 7 and the second nozzles 6 may be designed to match the shape and size of the reactor core, and the cross-section may be square, circular, regular hexagonal, etc.
The principle of the application is as follows:
(1) when the locking device is disassembled, the control rod guide tube 40 is pressed downwards, the control rod guide tube 40 moves downwards, the elastic opening and closing assembly 50 moves downwards along with the control rod guide tube, the elastic compression assembly 41 is compressed, and meanwhile, the elastic opening and closing assembly 50 is pressed by the sleeve 1, so that the part of the elastic opening and closing assembly 50 extending out of the clamping groove 10 is retracted into the sleeve 1.
(2) When the fuel assembly is installed, the sleeve 1 is slowly dropped, the control rod guide pipe 40 is pressed downwards, the positioning hook 500 is retracted into the sleeve 1, and the elastic compression assembly 41 is compressed until the first tube socket 3 on the sleeve 1 is ballasted on the upper surface of the lower support plate 2 of the reactor core; the control rod guide tubes 40 are then released and the compressed resilient compression assemblies 41 reposition the control rod guide tubes 40 and the positioning hooks 500 again extend out of the pockets 10 and bear against the lower surface of the core lower support plate 2.
(3) When fuel assemblies are reloaded, the control rod guide tubes 40 are pressed down, the positioning hooks 500 are retracted into the sleeves 1, and then the sleeves 1 are lifted to be separated from the lower support plate 2 of the reactor core, so that the fuel assemblies and the lower support plate 2 of the reactor core are integrally separated to carry out integral reloading.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A locking device suitable for use in a marine reactor, comprising:
the reactor core support plate structure comprises a sleeve (1), at least two clamping grooves (10) are formed in the sleeve (1), and the sleeve (1) is used for penetrating through a reactor core lower support plate (2);
a first nozzle (3) provided on the sleeve (1) and ballasted on an upper surface of the lower core support plate (2);
the locking mechanism (5) is positioned in the sleeve (1) and comprises an elastic opening and closing component (50) corresponding to the clamping groove (10); the elastic opening and closing assembly (50) partially extends out of the clamping groove (10) and is used for supporting the lower surface of the reactor core lower supporting plate (2);
a drive mechanism (4) assembled in the sleeve (1) and comprising a control rod guide tube (40) and a resilient compression assembly (41), the control rod guide tube (40) being connected to the locking mechanism (5); the control rod guide tube (40) is used for moving downwards to compress the elastic compression assembly (41) and drive the part of the elastic opening and closing assembly (50) extending out of the clamping groove (10) to retract into the sleeve (1).
2. Locking device for a marine reactor according to claim 1, characterised in that said elastic opening and closing assembly (50) comprises:
a positioning hook (500) rotatably connected to the control rod guide tube (40);
and one end of the elastic sheet (501) is connected to the control rod guide tube (40), and the other end of the elastic sheet is used for pushing the positioning hook (500) so that the part of the positioning hook (500) extends out of the clamping groove (10).
3. A locking device for a marine reactor according to claim 2, wherein: the locking mechanism (5) further comprises a connecting bracket (51), the connecting bracket (51) is detachably connected with the control rod guide tube (40), and the elastic opening and closing assembly (50) is indirectly connected with the control rod guide tube (40) through the connecting bracket (51).
4. A locking device for a marine reactor according to claim 2, wherein: the part of the positioning hook (500) extending out of the clamping groove (10) is provided with a supporting part (502) attached to the lower surface of the reactor core lower supporting plate (2).
5. A locking device for a marine reactor according to claim 2, wherein: one side of the positioning hook (500) close to the control rod guide tube (40) is provided with a limiting part (503), and the limiting part (503) is used for limiting the rotation angle of the positioning hook (500).
6. A locking device for a marine reactor according to claim 1, wherein: the elastic compression assembly (41) is located above the locking mechanism (5), the elastic compression assembly (41) comprising:
a first limit table (411) connected to the inner wall of the sleeve (1);
a second limit stop (412) connected to the control rod guide tube (40);
and the elastic piece (414) is sleeved on the control rod guide tube (40) and is positioned between the first limiting table (411) and the second limiting table (412).
7. A locking device suitable for use in a marine reactor according to claim 1, characterised in that said elastic compression assembly (41) comprises:
the third limiting table is positioned at the lower end of the sleeve (1);
an elastic member (414) located in a space between the third stopping table and the locking mechanism (5).
8. The locking device for a marine reactor according to claim 6 or 7, wherein: the elastic member (414) is a spring.
9. A locking device for a marine reactor according to claim 1, wherein: the bottom wall of the clamping groove (10) is an inclined surface, and the elastic opening and closing assembly (50) is provided with an inclined part matched with the inclined surface.
10. A fuel assembly adapted for use in a marine reactor, comprising:
a locking device for a marine reactor according to claim 1; and the number of the first and second groups,
a second socket (6) arranged on top of the sleeve (1);
a grid (7) disposed on the sleeve (1) and between the first and second stem (3, 6), the grid (7) being for placement of fuel rods (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011343024.9A CN112420224A (en) | 2020-11-25 | 2020-11-25 | Locking device and fuel assembly suitable for marine reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011343024.9A CN112420224A (en) | 2020-11-25 | 2020-11-25 | Locking device and fuel assembly suitable for marine reactor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112420224A true CN112420224A (en) | 2021-02-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011343024.9A Pending CN112420224A (en) | 2020-11-25 | 2020-11-25 | Locking device and fuel assembly suitable for marine reactor |
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| Country | Link |
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| CN (1) | CN112420224A (en) |
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| CN113782240A (en) * | 2021-08-11 | 2021-12-10 | 中国原子能科学研究院 | Replacing tool for control rod moving body |
| CN113851239A (en) * | 2021-09-26 | 2021-12-28 | 中国原子能科学研究院 | Replacing tool for outer sleeve of control rod assembly |
| WO2023077468A1 (en) * | 2021-11-05 | 2023-05-11 | 中广核研究院有限公司 | Fuel assembly locking device |
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| CN109767850A (en) * | 2018-12-21 | 2019-05-17 | 中广核研究院有限公司 | Fuel assembly lower locking mechanism and its application method |
| CN209641358U (en) * | 2019-01-04 | 2019-11-15 | 中广核研究院有限公司 | Fuel assembly locking device and nuclear reactor for heavy metal reactor |
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| CN113782240A (en) * | 2021-08-11 | 2021-12-10 | 中国原子能科学研究院 | Replacing tool for control rod moving body |
| CN113782240B (en) * | 2021-08-11 | 2024-02-20 | 中国原子能科学研究院 | A reloading instrument for control stick mobile body |
| CN113851239A (en) * | 2021-09-26 | 2021-12-28 | 中国原子能科学研究院 | Replacing tool for outer sleeve of control rod assembly |
| CN113851239B (en) * | 2021-09-26 | 2024-02-20 | 中国原子能科学研究院 | Material changing tool for outer sleeve of control rod assembly |
| WO2023077468A1 (en) * | 2021-11-05 | 2023-05-11 | 中广核研究院有限公司 | Fuel assembly locking device |
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