KR20080089857A - Refueling machine grapple - Google Patents

Abstract

A refueling machine grapple is provided to prevent a grapple releasing device from reversely rotating by supplying resisting power when putting a steel ball for a grapple releasing device on a slot with power of a spring. A grapple housing(1) is a case constituting a body of a grapple. A grapple stop pin guide barrel(5) facilitates mounting by guiding the grapple to a nuclear fuel head(20) and sets an initial installation position of a nuclear fuel clamp bar axis(11). The nuclear fuel clamp bar axis draws the nuclear fuel inserted and installed inside the grapple housing in an axial direction. A grapple guide pin(10) is installed at one point of an upper end portion of the grapple housing and monitors a vertical pulling distance of the nuclear fuel clamp bar axis. A grapple guide axis(7) is installed at a lower portion of the nuclear fuel clamp bar axis and is a portion of a grapple releasing device(6) used to monitor coupling with the nuclear fuel. The grapple releasing device is inserted and installed at a circumferential portion of a center part of the grapple guide axis and releases the grapple in loading the nuclear fuel. A grapple chuck(3) is installed at an inner diameter portion of the grapple housing and lifts a nuclear fuel chuck fixing unit(21) formed at an upper portion of the nuclear fuel head while moving vertically.

Description

Refueling Machine Grapple

1 is a cross-sectional view of a nuclear fuel grapple and a nuclear fuel head to which the present invention is applied;

2a, 2b is an operational flow chart of the nuclear fuel grapple according to the invention,

3A to 3E are cross-sectional exemplary views showing details of main parts at positions (I) to (V) shown in FIGS. 2A and 2B;

4 is a schematic explanatory view of a grapple releasing device of a nuclear fuel grapple according to the present invention.

<Description of the symbols for the main parts of the drawings>

(1): grapple housing (2): grapple steel ball

(3): grapple chuck (4): grapple stopper

(5): grapple stopper guide (6): grapple release device

(7): grapple guide shaft (8): grapple release device

(9): Grapple release pin (10): Grapple guide pin

(11): fuel tong shaft (20): nuclear fuel head

(21): fuel chuck fixture (22): nuclear fuel chuck

23: fixed chuck guide pin 30: reactor

(310): protrusion 110: grapple guide shaft locking jaw

120: grapple chuck jaw 210: fuel chuck fixture groove

(510, 610, 620): Groove (1100): Grapple Guide Pin Groove

630: spring

The present invention relates to a nuclear fuel grapple (nuclear fuel tongs) used for picking up and loading new fuel into a nuclear reactor core when reloading small and medium-sized fuels applied to an integrated nuclear reactor, or for picking up spent fuel from the nuclear reactor core. The present invention relates to a nuclear fuel grapple that handles nuclear fuel and draws or loads the fuel to be suitable for designing a fuel head composed of a fuel anchor chuck and a fuel chuck anchor in a small and medium-sized fuel installed in the fuel cell.

Reactors should be withdrawn and reloaded according to reactor operating cycles or operating conditions.

If the reactor is operated after the new fuel is installed in the reactor core, the inside of the reactor including nuclear fuel is contaminated by radioactive material, and after the dismantling, the operator will never be able to access the inside of the reactor.

Therefore, the withdrawal and reloading of spent fuel should be carried out by a remotely controlled reloader and the operator should be able to work at a remote location within the radiation dose prescribed by law.

The reloader lowers the fuel tongs into the reactor to match the position of the fuel head and then loads or withdraws the fuel using the fuel grapple installed at the bottom of the fuel tongs.

Nuclear fuel is manufactured in the form of reactor suitable for pressurized water reactor, boiling water reactor, pressurized heavy water reactor, etc., and even reactors of the same type have unique fuel design unique to each reactor. In particular, the fuel has a unique shape of the fuel head depending on the design of the reactor in which the fuel is installed at the reactor core. As a result, the shape of the nuclear fuel grapples installed in the reloader is not standardized, and has been developed with the appropriate shape and function for each reactor. In the case of small and medium-sized integrated reactors being developed in Korea, the method of fixing nuclear fuel in the reactor core is very different from the existing reactors.

Therefore, the conventional nuclear fuel grapple has a problem that it can not be used in small and medium-size integrated reactor.

An object of the present invention for solving the above problems is to provide a nuclear fuel grapple that significantly improved the stability and reliability when dismantling the reload nuclear fuel used in small and medium-sized integrated reactor, specifically, when the fuel is withdrawn nuclear fuel It is fastened to the fuel chuck holder installed in the head to draw the fuel chuck holder, and it is possible to take out the fuel by releasing the coupling between the reactor and the fuel fixing chuck, and then extract the fuel fastened to the fuel grapple, or when the fuel is loaded, After loading the nuclear fuel into the reactor core, the fuel chuck holder is inserted into the fuel head to provide a fuel grapple that allows the fuel to be fixed to the reactor.

The configuration of the present invention to achieve the object as described above and to perform the problem for eliminating the conventional defects in the grapple device for withdrawing and loading the nuclear fuel in the reactor,

A grapple housing which is a case forming a torso of the grapple;

A grapple stopper guide passage installed at the bottom of the grapple housing to guide the fuel grapple to the nuclear fuel head located at the bottom to facilitate mounting and to set an initial installation position of the fuel tong rod shaft;

A nuclear forceps rod shaft for extracting the nuclear fuel inserted into the grapple housing in the axial direction;

A grapple guide pin installed at one point of the upper end of the grapple housing to clamp up and down lifting distances of the nuclear forceps rod shaft;

A grapple guide shaft disposed below the nuclear forceps rod shaft and configured as part of a grapple releasing device used to control engagement with nuclear fuel;

A grapple release device configured to release the grapple during nuclear fuel loading, including the grapple guide shaft;

It is characterized in that it comprises a grapple chuck installed to the inner diameter portion of the grapple housing and configured to raise the fuel chuck holder formed on the upper portion of the nuclear fuel head while moving up and down.

At one point of the upper part of the grapple housing, a grapple guide pin is configured to be fixed to penetrate the inner diameter portion in a horizontal direction, and a grapple guide pin groove having a predetermined length in the longitudinal direction is formed on the nuclear forceps rod shaft. The guide pin is inserted through the clamping shaft, and the lifting distance of the nuclear forceps rod shaft to the grapple housing is intermittent.

The grapple stop pin guide tube is configured to be coupled at the outer diameter portion of the grapple housing is configured to move the grapple housing up and down, the grapple housing in the grooves formed in the stop pin guide tube grapple housing The grapple stop pin protruding outward from the hook is caught to configure the feed distance up and down.

Grooves are formed on the outer circumferential side of the grapple release device at a predetermined length in the upper and lower portions thereof, and a plurality of grooves in the lower portion are formed in the circumferential direction, and the grapple release pin is inserted into the neighboring grooves in the lifting and releasing step. It is configured to move along, a plurality of grooves in the upper direction is formed in two directions to configure the grapple release device steel ball to move in accordance with the lifting and lifting step.

The grapple releasing pin and the grapple releasing device steel ball position in each step groove are adjacent to each other while the grapple releasing device rotates with respect to the grapple guide shaft while the grapple releasing device rotates with respect to the grapple guide shaft. Configure it to go home.

The size of each position of the groove in which the grapple release pin is located is configured differently so that the amount of axial movement of the grapple release device and the nuclear forceps rod shaft is controlled by the grapple release pin.

The shape of the groove in which the grapple release pin is located is configured to be inclined to one side so that the grapple release pin is not inserted in the reverse direction when the grapple release pin is switched to the next position.

The steel ball for the grapple release device is provided with a spring at the rear portion to move between the slot-shaped grooves along the circumferential surface, the resistance enough to prevent the arbitrary rotation of the grapple release device in the state of being mounted in the slot-shaped groove It is configured to prevent the grapple release device to be rotated in the reverse direction arbitrarily.

A grapple guide shaft engaging jaw is formed at a lower portion of the grapple guide shaft to protrude to a predetermined length so that the movement of the bottom of the grapple guide shaft moving up and down inside the grapple housing is intermittent.

The fixing of the grapple chuck and the fuel chuck holder is a projection formed at the bottom of the grapple chuck when the grapple chuck is raised so that the grapple steel ball is inserted into the grapple steel locking groove formed on one side of the nuclear fuel chuck holder. It pushes outwards and closes to the grapple steel locking groove so as to exert a fixing force.

The grapple chuck fixture rises upwards, and when the fixed chuck guide pin installed at the upper portion of the nuclear fuel chuck is caught at the lower end of the fuel chuck fixture groove formed longitudinally on one side of the nuclear fuel chuck holder, the fuel chuck is removed from the reactor groove. It is configured to withdraw to the top.

Hereinafter, the configuration and the operation of the embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of a nuclear fuel grapple according to the present invention and a nuclear fuel head to which the present invention is applied, and as shown in the drawing, there is a grapple housing 1 which is a body forming a body, and at the bottom of the grapple housing. The grapple stopper guide cylinder 5 is configured to be coupled at the outer diameter portion of the grapple housing 1. The grapple stopper guide (5) guides the nuclear fuel grapple to the nuclear fuel head (20) located at the bottom to facilitate mounting and to set the initial installation position of the nuclear forceps rod shaft.

At one point of the upper part of the grapple housing (1), the grapple guide pin (10) is fixed through the inner diameter in the horizontal direction, the nuclear fuel tong rod shaft (11) in the length of the grapple guide pin groove in a certain section length 1100 is formed and the grapple guide pin 10 is inserted therethrough so that the lifting distance of the nuclear forceps rod shaft 11 with respect to the grapple housing 1 is intermittent.

The stop pin guide tube (5) is to move the grapple housing (1) up and down, Shanghai transport distance of the stop pin guide tube (5) is a grapple housing (510) formed in the stop pin guide tube (5) ( The grapple stop pin (4) protruding outwardly in 1) is caught to interrupt the transport distance up and down.

In addition, inside the grapple housing, a device configuration for extracting nuclear fuel is inserted and operated. First, a nuclear forceps rod shaft 11 is installed from an upper portion, and a grapple guide shaft 7 is coupled to a lower portion of the nuclear forceps rod shaft 11. .

The grapple guide shaft (7) is inserted into the center portion of the grapple guide shaft (7) is configured to release the grapple during nuclear fuel loading. Grooves 610 and 620 are formed on the outer circumferential side of the grapple releasing device 6 at predetermined lengths at upper and lower sides, and a plurality of grooves 610 in the lower portion are formed in the circumferential direction to release the grapple release pin 9. ) Is inserted into the neighboring groove 610 and moved according to the lifting and releasing step. At this time, the position of the grapple release pin (9) in each step groove (610) in the groove because the grapple release device (6) rotates about the grapple guide shaft (7) in accordance with the rise or fall of the grapple. As the vertical position changes, it moves to a neighboring groove.

In addition, a plurality of grooves 620 are also formed in the circumferential direction, such that the grapple releasing device steel balls 8 move according to the lifting and releasing steps. At this time, the position of the grapple release device (8) in each step groove (620) is within the groove because the grapple release device (6) rotates with respect to the grapple guide shaft (7) in accordance with the rise or fall of the grapple. The vertical position of the is changed to move to the neighboring groove.

In addition, since the positions of the grooves 610 are different from each other, the amount of axial movement of the grapple releasing device 6 and the nuclear forceps rod shaft 11 is controlled by the grapple releasing pin 9.

In addition, the bottom of the grapple guide shaft 7 is formed with a grapple guide shaft engaging jaw 110 protruding to a predetermined length is moved to the lower side of the grapple guide shaft 7 to move up and down inside the grapple housing (1) Will be cracked down.

In addition, a grapple chuck 3 is formed on the inner diameter of the grapple guide shaft engaging jaw 110 protruding in the inner diameter direction of the grapple housing 1, and the fuel chuck holder formed on the upper portion of the nuclear fuel head while moving up and down ( 21) will be raised.

The grapple chuck 3 and the nuclear fuel chuck fixture 21 are fixed by the grapple steel ball 2 being inserted into the grapple steel ball locking groove 220 formed at one side of the nuclear fuel chuck holder 21 to be raised. Specifically, as the grapple chuck 3 rises, the protrusion 31 formed at the lower end of the grapple chuck 3 pushes the grapple steel ball 2 outward so as to closely adhere to the grapple steel ball locking groove 220. As a result, the fixing force is exerted.

In addition, the grapple chuck holder 21 rises in the upper direction, and the chuck guide pins 23 provided at the upper portion of the nuclear fuel holding chuck 22 have a fuel chuck holder formed in a longitudinal direction at one side of the fuel chuck holder 21. When caught in the lower end of the groove 210, the nuclear fuel holding chuck 22 is configured to withdraw from the groove of the nuclear reactor and withdrawn to the top.

Figure 2a, 2b is a flow chart of the operation of the fuel grapple according to the present invention, Figure 2a is a flow chart of the fuel grapple based on the fuel head, Figure 2b is a flow chart of the operation of the fuel grapple based on the grapple position. 3A to 3E are cross-sectional exemplary views showing the main parts at positions (I) to (V) shown in FIGS. 2A and 2B. The nuclear fuel mounted in the reactor as shown in FIG. The process is explained. The process of loading the fuel into the reactor core is the reverse of the withdrawal process, and the loading of the fuel is also performed by the same device.

In a nuclear fuel reloader (not shown) installed in the upper reactor building, the nuclear fuel tongs equipped with the fuel grapple according to the present invention are lowered to the fuel position to be withdrawn. In this case, the reactor is ready for reloading, and detailed description thereof will be omitted.

Specifically, the nuclear fuel grapple lowered to the position (I) has a grapple stop pin guide tube 5 mounted on the fuel head 20 and a fuel clamp pin shaft 11 by the grapple stop pin 4. , No whole city) Continue to descend until the descent stops (position II).

The fuel grapple mounted on the lower end of the nuclear forceps tongs 11 is placed on the nuclear fuel head 20 and then lifts the nuclear power tongs 11 as in the (III) position. The lifting distance of the nuclear forceps rod shaft 11 with respect to the grapple housing 1 is limited by the grapple guide pins 10, which are at a height before the nuclear forceps rod shaft 11 contacts the grapple guide pins 10. The projection 310 formed on the bottom of the pleated chuck 3 pushes one or more grapple steel balls 2 in a radial direction to grapple steel balls in the grapple steel ball locking groove 220 of the nuclear fuel chuck holder 21. Let (2) get caught.

In this state, if the fuel tong rod shaft 11 is continuously lifted, the fuel chuck fixture 21 is drawn out together with the fuel tong rod shaft 11, as shown in the position (IV), and the fuel holding chuck 22 is returned to its original position. Nuclear fuel and the reactor are in the unlocked state (A in the (I) position, A 'in the (IV) position).

Lifting of the fuel anchoring chuck 22 is limited by the anchoring chuck guide pin 23, and after the fuel anchoring chuck 22 is lifted to its maximum height, fuel begins to be lifted from the reactor as shown in position (V). do.

After the fuel has been lifted, the fuel must be installed in a fixed storage and the fuel grapple must be separated from the fuel. (V) When the fuel pinch rod shaft 11 is lowered with respect to the nuclear fuel fixed to the storage device in the position state, the fuel chuck holder 21 is lowered together and reduced to the initial charged state of the nuclear fuel as in the position state (II).

Then, if the fuel tong rod shaft is raised, the grapple chuck (3) rises and pushes the grapple steel ball (2), and the nuclear fuel holding chuck (22) and the bite state occurs, it is impossible to separate the fuel grapple. In order to solve this problem, the present invention introduces a grapple release device (6).

4 is a schematic explanatory view of a grapple releasing device of a nuclear fuel grapple according to the present invention. As shown, the grapple releasing device 6 is illustrated as an unfolded figure in the circumferential direction. The positions I, II, III, IV and V in the figure indicate the state of the grapple release device to match the positions of FIGS. 2A, 2B and 3A to 3E.

The grapple release device (6) is rotatable about the grapple guide shaft (7), as shown in Figure 4 the grapple release device steel (8) and the grapple release pin (9) can move along the groove ( 620 and 610 are processed.

Since the grapple release pin 9 is fixed to the grapple housing 1, when the nuclear forceps rod shaft moves up and down, the grapple release device 6 rotates along grooves 620 and 610 formed on the circumferential surface thereof. The relative motion circulating from position I to II, position II to III, and position VI again to position I of FIG. 4 is performed.

At this time, since the length of the groove 610 is different for each position as shown in FIG. 4, the amount of axial movement of the grapple releasing device and the nuclear forceps rod shaft is controlled by the grapple releasing pin 9.

(V) After the fuel is drawn out in the position state and the fuel is installed in the fixed storage device, the fuel clamp rod shaft 11 is lowered to the position (VI) of FIG. 4, wherein the state of the fuel and the fuel grapple is shown in FIG. It becomes the same as the (II) position state of 2a, 2b. At this time, if the fuel tong rod shaft 11 is raised to dismantle the fuel grapple from the fuel, the grapple release device 6 is switched to the (I) position state by the grapple release pin 9.

In the position (I), the length of the groove 610 processed in the grapple releasing device 6 (Fig. 4A) is the length of the groove in the positions (III), (IV), and (V) (Fig. 4). c) because the grapple chuck (3) is not lifted to a position where it can push the grapple steel ball (2), so that the grapple steel ball is not engaged with the fuel chuck holder (21) and thus the nuclear fuel The flaps can be lifted off the nuclear fuel.

To describe the groove shape of the grapple release device in more detail as shown in FIG. 4 so as to be inclined to one side so that the grapple release pin 9 is not inserted in the reverse direction when it is switched to the next position.

In addition, the grapple release device (8) can be moved along the circumferential surface between the slot-shaped groove 620, the grapple release device (6) in the state that is mounted on the slot by the force of the spring 630 in the rear portion The resistance of the grapple release device is prevented from being rotated in the reverse direction by providing enough resistance to prevent any rotation of the disc.

Therefore, in the present invention, it is not necessary for the reload operator to control the fastening and release of the fuel grapple and the nuclear fuel, and it is suitable for shortening the reloading time since it is automatically performed by a mechanical configuration.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

As described above, the present invention has been developed as a fuel grapple that can be used to dismantle and install nuclear fuel for small and medium-sized nuclear reactors. It is the invention which is expected greatly.

Claims (11)

In the grapple device for extracting and loading the nuclear fuel in the reactor, A grapple housing 1 which is a case forming a torso of a grapple; A grapple stopper guide (5) installed at the bottom of the grapple housing to guide the fuel grapple to the nuclear fuel head (20) located at the bottom to facilitate mounting and to set an initial installation position of the fuel tong rod shaft; A nuclear fuel tong rod shaft (11) for extracting nuclear fuel inserted into the grapple housing in the axial direction; A grapple guide pin 10 installed at one point of the upper end of the grapple housing 1 to control a vertical lifting distance of the nuclear fuel tong rod shaft 11; A grapple guide shaft installed under the nuclear forceps rod shaft and configured as part of a grapple releasing device used to control the fastening with the nuclear fuel; A grapple releasing device 6 inserted into a center portion of the grapple guide shaft 7 and configured to release the grapple during nuclear fuel loading; A nuclear fuel cabinet characterized in that it comprises a grapple chuck (3) installed on the inner diameter portion of the grapple housing (1) and configured to raise the fuel chuck holder (21) formed on the top of the nuclear fuel head while moving up and down. Electric grapple. The method of claim 1, At one point of the upper end of the grapple housing 1, the grapple guide pin 10 is configured to be fixed to penetrate the inner diameter portion in the horizontal direction, and guides the grapple having a predetermined length in the longitudinal direction to the nuclear forceps rod shaft 11. A fuel reloader graph, characterized in that the pin groove 1100 is formed so that the grapple guide pin 10 is inserted therethrough so that the lifting distance of the nuclear forceps rod shaft 11 with respect to the grapple housing 1 is intermittent. Play. The method of claim 1, The grapple detent pin guide cylinder 5 is configured to be coupled to the outer diameter portion of the grapple housing 1 is configured to move the grapple housing 1 up and down, Shanghai Song of the grapple detent pin guide cylinder 5 The distance is a nuclear fuel regeneration, characterized in that the groove 510 formed in the stop pin guide tube (5) is caught in the grapple stop pin (4) protruding outward from the grapple housing (1) is configured to control the transfer distance up and down Electric grapple. The method of claim 1, Grooves 610 and 620 are formed on the outer circumferential side of the grapple releasing device 6 at predetermined lengths at upper and lower sides, and a plurality of grooves 610 in the lower portion are formed in the circumferential direction. ) Is inserted into the neighboring groove 610 and configured to move according to the lifting and releasing step, the groove 620 of the upper portion is formed in the circumferential direction, the grapple release device steel ball 8 is lifting and releasing step A fuel reloader grapple, characterized in that configured to move in accordance with. The method of claim 4, wherein The grapple releasing pin 9 and the grapple releasing device steel ball 8 positions in the grooves 610 and 620 of each step are the grapple releasing device 6 according to the rise or fall of the grapple. 7) A nuclear fuel reloader grapple, characterized in that it is configured to move to a neighboring groove as the vertical position in the groove changes as it rotates with respect to 7). The method of claim 4, wherein The size of each position of the groove 610 in which the grapple release pin 9 is located is configured differently, and the shaft of the grapple release device 6 and the nuclear forceps rod shaft 11 are formed by the grapple release pin 9. A nuclear fuel reloader grapple, characterized in that configured to control the amount of directional movement. The method of claim 4, wherein The shape of the groove 610 in which the grapple release pin 9 is positioned is processed to be inclined toward the nuclear fuel reloader graph, characterized in that the grapple release pin 9 is configured not to be inserted in the reverse direction when switched to the next position. Play. The method of claim 4, wherein The grapple releasing device steel ball 8 is installed in the rear portion of the slot-shaped groove 620 to move along the circumferential surface of the slot-shaped groove 620, the grapple release in the state A nuclear fuel reloader grapple, characterized in that it is configured to provide resistance enough to prevent arbitrary rotation of the device (6) to prevent the grapple release device from rotating arbitrarily in the reverse direction. The method of claim 1, A grapple guide shaft engaging jaw 110 is formed at a lower portion of the grapple guide shaft 7 to protrude to a predetermined length to move downward of the grapple guide shaft 7 to move up and down inside the grapple housing 1. A nuclear fuel reloader grapple, characterized in that configured to control. The method of claim 1, The grapple chuck (3) and the fuel chuck holder 21 is fixed to the grapple so that the grapple steel (2) is inserted into the grapple steel groove engaging groove 220 formed on one side of the nuclear fuel chuck holder (21) When the chuck 3 is raised, the protrusion 31 formed at the lower end of the grapple chuck 3 pushes the grapple steel ball 2 outward so as to be in close contact with the grapple steel groove engaging groove 220 to exert a fixing force. Fuel reload grapple. The method of claim 1. The grapple chuck fixture 21 rises in the upper direction, and the chuck guide pin 23 provided at the upper portion of the nuclear fuel anchor chuck 22 has a fuel chuck anchor formed in a longitudinal direction on one side of the nuclear chuck anchor 21. A fuel reloader grapple, characterized in that configured to pull the nuclear fuel holding chuck 22 out of the reactor's groove when it is caught at the lower end of the groove 210.

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