CN112951453A - Safety locking device for nuclear fuel fixing equipment and nuclear fuel fixing equipment with safety locking device - Google Patents

Safety locking device for nuclear fuel fixing equipment and nuclear fuel fixing equipment with safety locking device Download PDF

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Publication number
CN112951453A
CN112951453A CN202011251900.5A CN202011251900A CN112951453A CN 112951453 A CN112951453 A CN 112951453A CN 202011251900 A CN202011251900 A CN 202011251900A CN 112951453 A CN112951453 A CN 112951453A
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CN
China
Prior art keywords
nuclear fuel
ball
guide unit
fixing
ball guide
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Pending
Application number
CN202011251900.5A
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Chinese (zh)
Inventor
曺永甲
许炯
俞渊植
李孝光
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Korea Atomic Energy Research Institute KAERI
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Korea Atomic Energy Research Institute KAERI
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Publication date
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Publication of CN112951453A publication Critical patent/CN112951453A/en
Pending legal-status Critical Current

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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
    • 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
    • G21C3/34—Spacer grids
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
    • G21C19/02—Details of handling arrangements
    • G21C19/06—Magazines for holding fuel elements or control elements
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C23/00—Adaptations of reactors to facilitate experimentation or irradiation
    • 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
    • G21C3/34—Spacer grids
    • G21C3/356—Spacer grids being provided with fuel element supporting members
    • 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
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/16—Rectilinearly-movable armatures
    • 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)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
  • Clamps And Clips (AREA)

Abstract

The invention relates to a safety locking device for a nuclear fuel fixation device, comprising: a fixing rod disposed under the nuclear fuel and configured to fix or release the nuclear fuel as the nuclear fuel moves up and down; and a magnetic part that selectively moves the fixing rod up and down using a magnetic force, wherein the safety locking apparatus for a nuclear fuel fixing device includes: an extension bar formed to extend downward from a lower end portion of the fixing bar and provided with a groove portion formed to be recessed on a side surface thereof; a ball guide unit provided with a ball portion formed to correspond to the groove portion such that the ball portion is seated on the groove portion as it moves up and down to fix the extension bar to restrict the movement at a predetermined height or to release a state in which the movement is restricted; and a driving unit configured to selectively move the ball guide unit up and down using a magnetic force.

Description

Safety locking device for nuclear fuel fixing equipment and nuclear fuel fixing equipment with safety locking device
Technical Field
The present disclosure relates to a safety locking device of a nuclear fuel fixing apparatus for fixing and releasing nuclear fuel disposed in a nuclear reactor at a predetermined position, and a nuclear fuel fixing apparatus having the same.
Background
In a research reactor having an upward-flowing core, a nuclear fuel fixing apparatus that prevents nuclear fuel from being released from the core due to flow is required. Looking at data found in existing research reactors, nuclear fuel securing devices in the related art use a method of securing nuclear fuel by manually rotating a mechanical latch located below the nuclear fuel.
In recent years, in order to improve the problems occurring in the mechanical latch type nuclear fuel fixing apparatuses in the related art, a new nuclear fuel fixing apparatus has been proposed in which nuclear fuel is remotely fixed or unlocked using the power of a permanent magnet. The nuclear fuel fixing apparatus proposed in korean patent No. 10-1760724 (7/24/2017), which is a patent document, has an advantage of automatically fixing nuclear fuel and excludes the possibility of radiation exposure of workers, compared to the mechanical latching method in the related art.
Hereinafter, a related art nuclear fuel fixing device 1 using permanent magnets 2a will be briefly described with reference to fig. 1A and 1B.
Fig. 1A and 1B are views showing a state of releasing the nuclear fuel 1A and a state of fixing the nuclear fuel 1A in the related art nuclear fuel fixing apparatus 1 using the permanent magnet 2a, respectively.
Referring to fig. 1A and 1B, in order to prevent the nuclear fuel 1A from being released by the water 8 flowing through the space between the grid 7a and the concrete portion 7B, the nuclear fuel fixing apparatus 1 is configured to stably fix the nuclear fuel 1A to the grid 7 a.
The function of the zero electromagnet of the nuclear fuel fixing device 1 is achieved by the configuration of the permanent magnet 2a and the electromagnet 2b connected in series inside the electromagnet housing 2c, which is a magnetic body. Specifically, when a current is applied to the electromagnet 2b, the electromagnet 2b cancels the force of the permanent magnet 2a, and the sum of the forces of the electromagnet 2b and the permanent magnet 2a is made zero to achieve zero electromagnetization.
Then, the fixing rod 3 is pushed out only by the force of the return spring 4c to restore the shunt tube 6 to its original state, in an opened state as shown in fig. 1A, so as to easily separate the nuclear fuel 1A from the grid 7a, and on the contrary, when no current flows through the electromagnet 2B, the force of the return spring 4c between the stator 4a and the mover 4B is overcome only by the force of the permanent magnet 2a, and at this time, the fixing rod 3 integrated with the mover 4B is pulled while pulling the mover 4B toward the stator 4a, and in a locked state as shown in fig. 1B, so that the upper end portion of the fixing rod 3 opens the upper end portion of the shunt tube 6 inside the groove container 1A' at the lower end portion of the nuclear fuel 1A, thereby locking and fixing the nuclear fuel 1A inside the grid 7 a.
At this time, a method of remotely checking whether the nuclear fuel fixing apparatus 1 is locked to prevent the nuclear fuel 1a from being released is to install the proximity sensor 5 outside the bottom surface of the sealing tube 9, and install the target member 3a, the target member 3a being a measuring body for sensing the proximity sensor 5 at the end of the fixing rod 3, the target member being integrated with the mover 4b, and when no current flows through the electromagnet 2b, the target member 3a at the end of the fixing rod 3 integrated with the mover 4b, which is moved only by the force of the permanent magnet 2a, can be accessed, i.e., the locked state of the nuclear fuel fixing apparatus 1 is checked through the open state of the signal of the proximity sensor 5.
In contrast, when a current is applied to the electromagnet 2b, which is zero-magnetized, and is in an open state of the nuclear fuel fixing apparatus 1 as shown in fig. 1A, the target piece 3a located at the end of the fixing rod 3 is moved upward between the stator 4a and the mover 4b only by the force of the return spring 4c to increase the distance from the proximity sensor 5, and as a result, the proximity sensor 5 may fail to recognize the target piece 3a, i.e., check the open state of the nuclear fuel fixing apparatus 1 by the closed state of the signal of the proximity sensor 5.
In this way, the above-described nuclear fuel fixing apparatus 1 is manipulated to fix the nuclear fuel 1a in such a manner that the wedge-shaped fixing rod 3 is operated using the force of the permanent magnet 2a, and conversely, whether or not to apply current to the electromagnet 2b is controlled to cancel the force of the permanent magnet 2a, and when the nuclear fuel 1a is unlocked, the fixing rod 3 is moved upward with the force of the return spring 4c to unlock the fixed state of the nuclear fuel 1 a.
However, when the permanent magnet 2a is aged or the electromagnet 2b is failed, the nuclear fuel fixing device 1 loses the function of holding the nuclear fuel 1 a. In addition, when the elastic force of the return spring 4c moving the fixing rod 3 fixing the nuclear fuel 1a upward is insufficient due to aging or the like, the fixing rod 3 may not move upward, thereby causing an unlocking phenomenon in which the function of the nuclear fuel 1a cannot be normally performed.
Disclosure of Invention
An aspect of the present disclosure is to provide a safety locking device for a nuclear fuel fixing apparatus, which can stably provide a function of fixing or unlocking nuclear fuel even when a function of a part for performing a nuclear fuel fixing or releasing operation of the nuclear fuel fixing apparatus is lost, and a nuclear fuel fixing apparatus having the same.
To achieve such an object of the present disclosure, a safety locking apparatus for a nuclear fuel fixing device according to an embodiment of the present disclosure may include: a fixing rod disposed under the nuclear fuel and configured to fix or release the nuclear fuel as it moves up and down; and a magnetic part that selectively moves the fixing rod up and down using a magnetic force, wherein the safety locking apparatus for a nuclear fuel fixing device includes: an extension bar formed to extend downward from a lower end portion of the fixing bar and provided with a groove portion formed to be recessed on a side surface thereof; a ball guide unit provided with a ball portion formed to correspond to the groove portion such that the ball portion is seated on the groove portion as it moves up and down to fix the extension bar to restrict the movement at a predetermined height or to release a state in which the movement is restricted; and a driving unit configured to selectively move the ball guide unit up and down using a magnetic force.
On the other hand, to achieve the object of the present disclosure, a nuclear fuel locking apparatus according to an embodiment of the present disclosure may include: a fixing rod disposed under the nuclear fuel and configured to fix or release the nuclear fuel as it moves up and down; a magnetic part selectively moving the fixing bar up and down by using a magnetic force; and a safety locking device connected to the fixing rod and configured to lock or unlock a state in which the fixing rod fixes the nuclear fuel, wherein the safety locking device includes: an extension bar formed to extend downward from a lower end portion of the fixing bar and provided with a groove portion formed to be recessed on a side surface thereof; a ball guide unit provided with a ball portion formed to correspond to the groove portion such that the ball portion is seated on the groove portion as it moves up and down to fix the extension bar to restrict the movement at a predetermined height or to release a state in which the movement is restricted; and a driving unit configured to selectively move the ball guide unit up and down using a magnetic force.
Drawings
Fig. 1A and 1B are views respectively showing a state where nuclear fuel is released and a state where nuclear fuel is fixed in a related art nuclear fuel fixing apparatus using a permanent magnet.
Fig. 2 is a conceptual diagram illustrating a nuclear fuel fixing apparatus having a safety locking device of the nuclear fuel fixing apparatus according to an embodiment of the present disclosure.
Fig. 3 is an enlarged view of a portion "a" shown in fig. 2.
Fig. 4 is a view for explaining an operation principle of the safety locking device shown in fig. 3.
Fig. 5 is a view illustrating an operation of releasing a fixed state of nuclear fuel using the position control unit shown in fig. 3.
Fig. 6 is a view illustrating an operation of releasing a fixed state of nuclear fuel using the unlocking device unit shown in fig. 3.
Detailed Description
Hereinafter, a safety locking device for a nuclear fuel fixing apparatus and a nuclear fuel fixing apparatus having the same according to the present disclosure will be described in more detail with reference to the accompanying drawings.
Even in different embodiments according to the present disclosure, the same or similar reference numerals are designated to the same or similar configurations, and the description thereof will be replaced with the earlier description.
In the case where an element is "connected" or "linked" to another element, it may be directly connected or linked to the other element, but there may be another element therebetween. In contrast, where an element is "directly connected" or "directly linked" to another element, it is understood that there are no other elements present between them.
As used herein, singular references may include plural references unless it is meant otherwise than the context dictates.
Fig. 2 is a conceptual view illustrating the nuclear fuel fixing apparatus 10 having the safety locking device 100 of the nuclear fuel fixing apparatus according to an embodiment of the present disclosure, and fig. 3 is an enlarged view of a portion "a" shown in fig. 2.
Referring to fig. 2 and 3, the nuclear fuel fixing apparatus 10 includes a fixing rod 13, a magnetic part 12, and a safety locking device 100. For example, in the case of the upflow core method in the nuclear reactor core, there may be provided a means capable of stably fixing the nuclear fuel 10a on the grid 17a so as to prevent the nuclear fuel 10a from being released by the water 18, the water 18 forming a flow from the lower side to the upper side through the space provided between the grid 17a and the concrete portion 17 b.
As disposed under the nuclear fuel 10a to move up and down in the longitudinal direction, the fixing rod 13 is configured to fix the movement of the nuclear fuel 10a to the louver 17a or to release from the louver 17a as the case may be.
The magnetic part 12 is configured to selectively move the fixing rod 13 up and down using a magnetic force. Specifically, the magnetic part 12 may include a permanent magnet 12a, an electromagnet part 12b, and an electromagnet housing 12 c. When a current is applied to the electromagnet portion 12b, the sum of the forces of the electromagnet portion 12b and the permanent magnet 12a is made zero to achieve zero electromagnetization. Then, as the force of the permanent magnet 12a pulling the mover 14b integrally constructed with the fixing rod 13 disappears, the shunt tube 16 restores the fixing state of releasing the nuclear fuel 10a, and at the same time, the fixing rod 13 is moved upward by the force of the spring 14c, thereby separating the nuclear fuel 10a from the louver 17 a.
In contrast, when no current flows through the electromagnet portion 12b, the force of the spring 14c located between the stator 14a and the mover 14b is overcome only by the force of the permanent magnet 12a, and the fixing rod 13 integrally constructed with the mover 14b is also pulled downward together while pulling the mover 14b toward the stator 14a and causing the upper end portion of the fixing rod 13 to open the upper end portion of the shunt tube 16, thereby fixing the movement of the nuclear fuel 10a to be restricted on the fixing groove 10 a'. The electromagnet housing 12c serves to restrict the direction of the magnetic force of the permanent magnet 12a to the inside of the electromagnet housing 12c so that the magnetic force acts only on the mover 14 b.
On the other hand, the nuclear fuel fixing equipment 10 may be provided with a target 13a and a proximity sensor 15 in order to remotely check whether the nuclear fuel 10a is locked. As a measuring body of the proximity sensor 15 for sensing the target piece 13a, it may be formed at an end of the fixing rod 13. Furthermore, the proximity sensor 15 may be arranged at the outside of the tubular unit 19. Therefore, when no current flows through the electromagnet portion 12b, the mover 14b is moved downward only by the force of the permanent magnet 12a, and the target formed at the end of the fixing rod 13 integrated with the mover 14b may approach the proximity sensor 15, i.e., by the open state of the signal of the proximity sensor 15, to check the locked state of the nuclear fuel fixing apparatus 1.
In contrast, when a current is applied to the electromagnet portion 12b, the magnetic portion 12 is zero-magnetized, and the target piece 13a located at the end of the fixing rod 13 is moved upward only by the force of the spring 14c, and therefore, the distance between the target piece 13a and the proximity sensor 15 is increased, and a state is switched in which the proximity sensor 15 cannot recognize the target piece 13 a. In other words, the user may check that the signal of the proximity sensor 15 is off to confirm that the nuclear fuel 10a of the nuclear fuel fixing apparatus 10 is unlocked.
Meanwhile, the nuclear fuel fixing apparatus 10 includes a safety locking device 100, the safety locking device 100 being connected to the fixing rod 13 and configured to lock a state in which the fixing rod 13 fixes the nuclear fuel 10 a.
The safety locking device 100 includes an extension rod 110, a ball guide unit 120, and a driving unit 130.
The extension bar 110 is provided with a groove portion 110a formed to extend downward from a lower end portion of the fixing bar 13 and formed to be recessed on a side surface thereof. In other words, the extension bar 110 is configured integrally with the fixing bar 13, and configured to move up and down together with the fixing bar 13.
The ball guide unit 120 includes a ball portion 120a formed to correspond to the shape of the groove portion 110 a. In addition, as the ball part 120a moves up and down along the longitudinal direction of the extension bar 110, the ball part 120a is seated in the groove part 110a of the extension bar 110 to fix the movement of the extension bar 110 to be restricted at a predetermined height or unlock the movement of the extension bar 110 to be released from the restricted state. As shown in fig. 2 and 3, the ball portion 120a may be formed in plurality. The ball portion 120a may be formed to have, for example, a spherical shape.
The driving unit 130 is configured to selectively move the ball guide unit 120 up and down using a magnetic force. For example, the driving unit 130 may include an electromagnet 131 and a mover portion 132.
The electromagnet 131 may be disposed at an outer side of the tubular unit 19, and magnetized to selectively pull and move the electromagnet 131 when a current is applied thereto, which will be described later.
The mover part 132 is made of a material that serves as an attractive force when the electromagnet 131 is magnetized, is formed to be integral with the ball guide unit 120, and is configured to move the ball guide unit 120 up and down according to whether a current is applied to the electromagnet 131. On the other hand, the mover portion 132 is provided not to overlap with the moving path of the ball portion 120a so as not to cause interference with the ball portion 120a during movement.
On the other hand, the fixing rod 13 and the extension rod 110 may be disposed at the inner side of the tubular unit 19, and the tubular unit 19 is formed to accommodate the fixing rod 13, the extension rod 110, and the ball guide unit 120. When the water 18 flowing between the grid 17a and the concrete portion 17b flows therein, the drain pipe 19a forms a flow path for discharging the water 18, a valve 19b is formed on the flow path of the drain pipe 19a to allow or block the discharge of the water 18, and a flange portion 19c formed at an end of the drain pipe 19a may be provided at a lower side of the tubular unit 19 to block the flow path of the drain pipe 19 a. A sealing member 19c' for watertightness of the flange portion 19c may be provided at a portion where the flange portion 19c and the drain pipe 19a are coupled to each other.
Additionally, the security lock device 100 may also include a ball housing 140.
The ball housing 140 may be disposed at an inner side of the tubular unit 19, and formed to position the height of the ball portion 120a at a predetermined height on the tubular unit 19. The ball housing 140 may be formed to allow the ball portion 120a to move in a horizontal direction at a predetermined height of the ball housing 140.
Further, the ball guide unit 120 is disposed at an outer side of the ball part 120a to surround the ball part 120a, and is configured to provide an accommodation space 120b movable in a horizontal direction when the ball part 120a is separated from the groove part 110a formed in the extension bar 110.
Meanwhile, the ball guide unit 120 may include a protrusion portion 121.
The protrusion part 121 is formed to protrude toward the extension bar 110, and is configured to move the ball part 120a to the groove part 110a of the extension bar 110 when the ball guide unit 120 moves upward. In addition, the protrusion part 121 may be provided with a guide surface 121a formed to be inclined upward toward the inner side of the ball guide unit 120 to guide the ball part 120a to the groove part 110a of the extension rod 110 when the ball guide unit 120 moves upward to allow the nuclear fuel fixing apparatus 10 to lock a state in which the nuclear fuel 10a is fixed. Therefore, when the ball guide unit 120 moves upward, the ball portion 120a located on the receiving space 120b can be more effectively moved and disposed on the groove portion 110 a.
On the other hand, the ball housing 140 is disposed in a fixed position at the inside of the tubular unit 19, and at this time, the ball guide unit 120 may be configured to move up and down in the length direction of the ball housing 140, the ball housing 140 being in a fixed state at the inside of the tubular unit 19. In other words, the ball guide unit 120 may be configured to be relatively moved in a vertical direction with respect to the ball housing 140.
Meanwhile, the safety locking apparatus 100 may further include a pressing member (not shown) formed on the groove portion 110a of the extension bar 110.
A pressing member may be formed on the groove portion 110a to apply an elastic force to the ball portion 120a toward the outside of the groove portion 110a such that the ball portion 120a comes out of the groove portion 110a of the extension bar 110 to move to the receiving space 120b of the ball guide unit 120 when the ball guide unit 120 moves upward. For example, the pressing member may be formed to have a spring structure. Therefore, when the ball guide unit 120 moves downward, the operation of moving the ball portion 120a located on the groove portion 110a onto the accommodation space 120b of the ball guide unit 120 can be more effectively performed.
Meanwhile, the safety locking apparatus 100 of the nuclear fuel fixing device may further include a sensing unit 170.
The sensing unit 170 is configured to sense a position change occurring when the ball guide unit 120 moves up and down. Specifically, a target portion 123 configured with a measuring body for sensing the sensing unit 170 may be formed below the ball guide unit 120. As shown with reference to fig. 2 and 3, the target portion 123 may be configured integrally with the ball guide unit 120 to move up and down together with the ball guide unit 120.
Meanwhile, the safety locking device 100 may further include a position adjusting unit 150.
The position adjusting unit 150 may be configured to move the position of the electromagnet 131 up and down at the outside of the tubular unit 19. As shown in fig. 2 and 3, the electromagnet 131 may be provided in a state of being accommodated on a housing 131a formed to surround the electromagnet 131. In the drawings of the present disclosure, the upper side of the case 131a is shown in an open state, but may be formed in a closed form instead of the open state. The position adjustment unit 150 may be formed in a bolt shape, for example. Accordingly, the position adjusting unit 150 may be configured to move the electromagnet 131 upward by a predetermined distance through the bottom of the housing 131 a.
Meanwhile, the security locking device 100 may further include an unlocking device unit 160.
The unlocking device unit 160 is detachably coupled to a portion of the ball guide unit 120, and may be configured to move the ball guide unit 120 upward by a predetermined height as needed. The unlocking device unit 160 may include, for example, a rod 161 extending in one direction. A screw structure for fastening a thread may be formed at an upper end portion of the rod 161. The rod 161 may be inserted into the tubular unit 19 through an opening portion formed in the drain pipe 19a of the tubular unit 19, and fastened and fixed to a lower portion of the ball guide unit 120. A fastening groove 123a formed to correspond to an upper end portion of the rod 161 may be formed at a lower portion of the ball guide unit 120 to be fastened to the upper end portion of the rod 161.
The unlocking device unit 160 may further include: a bent flange 162 for closing the open end of the drain pipe 19 a; and a sealing member 162a provided between the rod 161 and the bent flange 162 for water tightness of the bent flange 162.
Hereinafter, an operation principle of the safety locking apparatus 100 of the nuclear fuel fixing device according to an embodiment of the present disclosure will be described with reference to fig. 4.
Fig. 4 is a view for explaining an operation principle of the safety locking device 100 shown in fig. 3.
Referring to fig. 4, (a) of fig. 4 shows a state in which the nuclear fuel 10a is unlocked as a state in which the fixing rod 13 is moved upward. As for the sequence of unlocking the nuclear fuel 10a, first, when current is applied to turn on the power, the ball guide unit 120 and the mover part 132 are moved upward by the force of the electromagnet 131, and as a result, the user is prompted that the safety locking device 100 is unlocked while the sensing unit 170 is turned off.
Next, when a current is applied to the electromagnet portion 12b of the nuclear fuel fixing apparatus 10 to turn on the power, the fixing rod 13 is moved upward by the force of the spring 14c by removing the force of the permanent magnet 12a, and as a result, the user is prompted that the fixing state of the nuclear fuel 10a is unlocked while the proximity sensor 15 is turned off.
Next, (b) of fig. 4 shows a process of fixing the nuclear fuel 10 a. Referring to (b) of fig. 4, when the power of the electromagnet 12b is turned off, the force of the permanent magnet 12a acts more than that of the spring 14c to move the fixing rod 13 downward and fix the nuclear fuel 10 a. At this time, the proximity sensor 15 senses the target 13a to inform the user that the nuclear fuel 10a is fixed.
Next, fig. 4 (c) shows a process in which the safety locking device 100 will firmly lock the fixed state of the nuclear fuel 10a in the nuclear fuel fixing apparatus 10. Referring to (c) of fig. 4, when the power of the electromagnet 131 is turned off to cut off the current supply, the ball guide unit 120 and the mover part 132 are moved downward by their own weight and simultaneously seated on the groove part 110a of the extension bar 110 while guiding the movement of the ball part 120a, thereby safely and mechanically locking the movement of the fixing rod 13 connected to the extension bar 110.
Hereinafter, referring to fig. 5, an operation principle of releasing the fixed state of the nuclear fuel 10a using the position adjusting unit 150 shown in fig. 3 when the spring 14c of the nuclear fuel fixing apparatus 100 is disabled will be described.
Fig. 5 is a view illustrating an operation of releasing the fixed state of the nuclear fuel 10a using the position adjusting unit 150 shown in fig. 3.
First, referring to (a) of fig. 5, when the power of the electromagnet 131 of the safety lock device 100 is turned on to apply a current thereto, as a state in which the sensing unit 170 is turned OFF (OFF) by getting away from the target unit 123, a state in which the safety lock device 100 is unlocked is represented. In addition, the following states are indicated: in this state, although the electromagnet portion 12b of the nuclear fuel fixing apparatus 10 is turned on to apply current thereto, the restoring force of the spring 14c is insufficient, so that the fixing rod 13 is not moved upward. In other words, the nuclear fuel fixing device 10 shown in fig. 5 (a) is a state in which the proximity sensor 15 is turned on and the fixing state of the nuclear fuel 10a is not released.
Next, fig. 5 (b) illustrates an operation of pushing up the position of the electromagnet 131 using the position adjusting unit 150 on the case 131a to move the ball guide unit 120 and the mover part 132 upward. Therefore, even when the restoring force of the spring 14c is insufficient and its function is lost, the position of the fixing rod 13 is moved upward by the position adjusting unit 150 of the safety locking device 100, thereby stably releasing the fixed state of the nuclear fuel 10a to allow the nuclear fuel 10a to move.
Hereinafter, referring to fig. 6, an operation principle of releasing the unlocked state of the nuclear fuel 10a using the unlocking device unit 160 shown in fig. 3 when the magnetic part 12 of the nuclear fuel fixing apparatus 100 is disabled will be described.
Fig. 6 is a view illustrating an operation of releasing the fixed state of the nuclear fuel 10a using the unlocking device unit 160 shown in fig. 3.
Referring to (a) of fig. 6, a case is shown in which the sensing unit 170 is turned ON (ON) even if the power of the electromagnet 131 of the safety locking device 100 is turned ON (ON), i.e., a state in which the safety locking device 100 is not unlocked, and this may be regarded as a fault state in which the function of the safety locking device 100 is not normally performed. In this case, since the fixing rod 13 cannot be moved upward, a situation may occur in which the nuclear fuel 10a cannot be unlocked.
Referring to (b) of fig. 6, the flange portion 19c fastened to the end of the drain pipe 19a may be separated, and the unlocking device unit 160 may be assembled. At this time, it is possible to open the valve 19b and move the ball guide unit 120 and the mover part 132 upward using the rod 161 to unlock the locked state of the safety locking device 100. Then, an electric current is applied to the electromagnetic portion 12b of the nuclear fuel fixing device 10 to release the fixed state of the nuclear fuel 10 a.
Next, referring to (c) of fig. 6, when the restoring force of the spring 14c is insufficient so as not to move the fixing rod 13 upward, while the safety locking device 100 is not unlocked due to a malfunction occurring in the safety locking device 100, and the rod 161 may be further pushed upward to move the fixing rod 13 upward and release the fixed state of the nuclear fuel 10 a.
According to the present disclosure having the above-described configuration, the safety locking device includes an extension rod extending from a lower end portion of a fixing rod provided in the nuclear fuel fixing apparatus and provided with a groove portion formed to be recessed on a side surface thereof; and a ball guide unit allowing a ball portion formed to correspond to the groove portion to be seated on the groove portion of the extension bar to fix the extension bar at a predetermined height or release a state in which movement is restricted. Therefore, even during a failure of the magnetic part that realizes the operation of the nuclear fuel fixing apparatus, the nuclear fuel can be safely fixed or released to allow the nuclear fuel to move.
Further, when the function of the spring for moving the fixing rod to the upper side in the nuclear fuel fixing apparatus in the related art is lost, the unlocking operation of the nuclear fuel may be stably achieved by the position adjusting unit configured to move the electromagnet up and down. In addition, even when the function of the magnetic part of the nuclear fuel fixing apparatus in the related art is lost, the ball guide unit may be moved upward using the unlocking device unit to stably provide the function of unlocking the nuclear fuel.
The foregoing description is merely exemplary, and various modifications may be made by those skilled in the art to which the disclosure pertains without departing from the scope and technical spirit of the described embodiments. The foregoing embodiments may be implemented individually or in any combination thereof.

Claims (13)

1. A safety lockout device for a nuclear fuel fixture, comprising: a fixing rod disposed under the nuclear fuel and configured to fix or release the nuclear fuel as it moves up and down; and a magnetic part that selectively moves the fixing rod up and down using a magnetic force, wherein the safety locking apparatus for a nuclear fuel fixing device includes:
an extension bar formed to extend downward from a lower end portion of the fixing bar and provided with a groove portion formed to be recessed on a side surface thereof;
a ball guide unit provided with a ball portion formed to correspond to the groove portion such that the ball portion is seated on the groove portion as it moves up and down to fix the extension bar to restrict movement at a predetermined height or release a state in which movement is restricted; and
a driving unit configured to selectively move the ball guide unit up and down using a magnetic force.
2. The safety locking device for a nuclear fuel fixing apparatus according to claim 1,
characterized in that the fixing lever, the extension lever and the ball guide unit further include a ball housing provided at an inner side of a tubular unit formed to accommodate the fixing lever, the extension lever and the ball guide unit and formed to position a height of the ball portion at a preset height of the tubular portion.
3. The safety locking device for a nuclear fuel fixing apparatus as claimed in claim 2,
characterized in that the ball housing is formed such that the ball part can move in a horizontal direction over a preset height of the ball housing.
4. The safety locking device for a nuclear fuel fixing apparatus according to claim 3,
characterized in that the ball guide unit is disposed at an outer side of the ball part to surround the ball part and is configured to provide an accommodation space through which the ball part can move in a horizontal direction when the ball part is separated from the groove part.
5. The safety locking device for a nuclear fuel fixing apparatus according to claim 4,
characterized in that the ball guide unit is provided with a protruding portion formed to protrude toward the extension bar to move the ball portion to the groove portion when the ball guide unit moves upward.
6. The safety locking device for a nuclear fuel fixing apparatus according to claim 5,
characterized in that the protruding portion is provided with a guide surface formed to be inclined upward toward an inner side of the ball guide unit so as to guide the ball portion to the groove portion when the ball guide unit is moved upward.
7. The safety locking device for a nuclear fuel fixing apparatus according to claim 1,
characterized in that the ball housing is arranged in a fixed position at the inside of the tubular unit, and
the ball guide unit is configured to move up and down in a longitudinal direction of the ball housing at an inner side of the tubular unit in a fixed state.
8. The safety lockout device for a nuclear fuel fixture of claim 4, further comprising:
a pressing member formed on the groove portion to apply an elastic force to the ball portion toward an outer side of the groove portion to allow the ball portion to move out of the groove portion into the accommodation space when the ball guide unit moves upward.
9. The safety lockout device for a nuclear fuel fixture of claim 1, further comprising:
a sensing unit configured to sense a position change occurring when the ball guide unit moves up and down.
10. The safety locking device for a nuclear fuel fixing apparatus as claimed in claim 2,
characterized in that the drive unit comprises:
an electromagnet disposed at an outer side of the tubular unit to be magnetized when a current is applied thereto; and
a mover made of a material that serves as an attractive force when an electromagnet is magnetized, formed as one body with the ball guide unit, and configured to move the ball guide unit up and down according to whether a current is applied to the electromagnet.
11. The safety lockout device for a nuclear fuel fixture of claim 10, further comprising:
a position adjustment unit configured to move a position of the electromagnet up and down at an outer side of the tubular unit.
12. The safety lockout device for a nuclear fuel fixture of claim 1, further comprising:
an unlocking device unit detachably coupled to a portion of the ball guide unit and configured to move the ball guide unit upward by a predetermined height.
13. A nuclear fuel locking device comprising:
a fixing rod disposed under the nuclear fuel and configured to fix or release the nuclear fuel as it moves up and down;
a magnetic part selectively moving the fixing bar up and down using a magnetic force; and
a safety locking device connected to the fixing rod and configured to lock or unlock a state in which the fixing rod fixes the nuclear fuel,
wherein the safety locking device comprises:
an extension bar formed to extend downward from a lower end portion of the fixing bar and provided with a groove portion formed to be recessed on a side surface thereof;
a ball guide unit provided with a ball portion formed to correspond to the groove portion such that the ball portion is seated on the groove portion as it moves up and down to fix the extension bar to restrict movement at a predetermined height or to release a state in which movement is restricted; and
a driving unit configured to selectively move the ball guide unit up and down using a magnetic force.
CN202011251900.5A 2019-11-26 2020-11-11 Safety locking device for nuclear fuel fixing equipment and nuclear fuel fixing equipment with safety locking device Pending CN112951453A (en)

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KR1020190153637A KR102284601B1 (en) 2019-11-26 2019-11-26 Safety locking apparatus for nuclear fuel fixing equipment and nuclear fuel fixing equipment having the same one
KR10-2019-0153637 2019-11-26

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RU2748908C1 (en) 2021-06-01
AR120463A1 (en) 2022-02-16
KR20210064903A (en) 2021-06-03

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