JP2023136523A - Pulverization device - Google Patents

Abstract

To provide a device which can safely pulverize an obstacle existing when used fuel is taken out from a fuel storage rack.SOLUTION: A pulverization device X is provided which pulverizes an object becoming an obstacle when a channel box is taken out from a fuel storage rack comprised of a plurality of rack cells, the pulverization device X comprises: a hammer portion A which is inserted into one rack cell r; an insertion portion B which inserts the hammer portion A into the inside of the one rack cell r to thereby support the hammer; a control mechanism C which controls an action of the hammer portion A; and a support portion D which supports the insertion portion B and control mechanism C. The hammer portion A has: a hammer portion main body A1 which is coupled to the insertion portion B; and an abutting portion A2 which is provided in the hammer main body A1, and can abut on an inner wall of the one rack cell r. The control mechanism C impart propulsion force toward the inner wall to the hammer main body A1, to thereby cause the abutting portion A2 to collide with the inner wall of the one rack cell r.SELECTED DRAWING: Figure 1

Description

The present invention relates to a device for crushing obstacles during spent fuel removal operations.

As a result of the Great East Japan Earthquake that occurred in March 2011, a hydrogen explosion occurred at Unit 3 of the Fukushima Daiichi Nuclear Power Plant, and fragments of the reactor building damaged by the explosion were placed in rubble on fuel storage racks in the spent fuel pool. It became scattered.

Debris gets into the gaps between the channel box that covers the fuel assembly and the channel fasteners that connect the channel box and the fuel assembly, as well as the gaps between the channel box and rack cells, impeding the work to remove spent fuel. was.

However, on the fuel storage rack located at a special location at a depth of approximately 7m within the spent fuel pool, it is difficult to safely remove debris that has gotten into the gaps between the channel box and channel fasteners and the gaps between the channel box and rack cells. There has never been a suitable device for this purpose.

none

The present invention has been made in view of the above situation, and an object to be solved is to provide a device that can safely crush obstacles when taking out spent fuel from a fuel storage rack.

In order to solve the above problems, the present invention provides a crushing device for crushing objects that become an obstacle when taking out spent fuel from a fuel storage rack composed of a plurality of rack cells,
a hammer part that is inserted into the one rack cell; an insertion part that inserts and supports the hammer part into the first rack cell; a control mechanism that controls the operation of the hammer part; and a control mechanism that controls the insertion part and the control mechanism. A supporting portion for supporting the
The hammer part has a hammer part main body connected to the insertion part, and a contact part provided on the hammer part main body and capable of contacting an inner wall of the one rack cell,
The control mechanism causes the contact portion to collide with the inner wall of the one rack cell by applying a propulsive force toward the inner wall to the hammer body.

According to the present invention, the control mechanism causes the abutting portion to collide with the inner wall of one rack cell, so that the abutting portion collides with debris that has entered between the channel box and the rack cell in the rack cell adjacent to this rack cell. It becomes possible to apply the impact force associated with the impact.
By performing this striking action a necessary number of times, the operator can crush the target rubble and can smoothly perform the task of taking out the channel box.

In a preferred form of the present invention, the insertion part has a pivot support that rotatably supports the hammer part main body,
The control mechanism causes the contact portion to collide with an inner wall of the one rack cell by rotating the hammer portion main body around the shaft support.

With such a configuration, the operator can more efficiently apply the impact force associated with the collision of the abutting portion using the centrifugal force of the hammer body.

In a preferred form of the invention, the pivot support extends substantially horizontally;
The control mechanism includes a reciprocating part that is inserted into the one rack cell together with the hammer part and the insertion part, and a vibration imparting part that moves the reciprocating part up and down along a substantially vertical direction,
The reciprocating part includes a reciprocating part main body connected to the vibration applying part, and a connecting part connecting the reciprocating part main body and the hammer part main body,
The hammer main body rotates around the shaft support due to the vertical movement of the connecting portion via the vibration applying portion.

With this configuration, the operator can easily and continuously perform the striking operation with the abutting part by the operation of the vibration applying part and the reciprocating part, and the worker can easily and continuously perform the striking action with the contact part. Improves sex.

In a preferred embodiment of the present invention, the insertion portion and the reciprocating portion are elongated bodies extending substantially vertically,
A plurality of the shaft supports are provided in the insertion portion along a substantially vertical direction,
The reciprocating portion is provided with a plurality of the connecting portions along a substantially vertical direction,
A plurality of the hammer main bodies are provided along a substantially vertical direction,
Each of the plurality of hammer main bodies is connected to the insertion portion via one of the shaft supports, and is also connected to the reciprocating portion via one of the connection portions.

With this configuration, it is possible to apply impact force all at once to multiple pieces of debris that have entered between the channel box and the rack cell at a predetermined interval in the vertical direction, and to remove the debris. The workability of crushing work is further improved.

In a preferred embodiment of the present invention, a lifting portion is provided for lifting the insertion portion and the control mechanism via the support portion,
The lifting section has a lifting section main body to which a predetermined lifting machine is locked, and a main connecting cable connecting the lifting section main body and the support section.

With such a configuration, the operator can easily carry out the work of transporting the present crushing device to the target fuel storage rack and the work of removing it.

In a preferred form of the present invention, the lifting part has a sub-connection rope connecting the lifting part main body and the reciprocating part main body,
A predetermined tension is generated in the sub-connection rope in a state in which the insertion portion and the control mechanism are lifted,
The reciprocating part main body is configured to be movable upward by the tension,
The hammer part main body rotates in a direction in which the abutting part moves away from an inner wall that is a collision target of the one rack cell, due to the movement of the reciprocating part main body based on the tension.

With such a configuration, when the operator lifts up the present crushing device, the reciprocating part main body moves upward, and accordingly, the hammer part main body rotates around the shaft support.
The hammer body rotates in the direction in which the abutting part moves away from the inner wall of the target object, so when the insertion part etc. is inserted into the target rack cell, the abutting part gets caught in the opening of the rack cell. The situation can be brought under control.
This allows the operator to smoothly insert the insertion portion into the target rack cell.

In a preferred embodiment of the present invention, the support section has a placement section on which the lifting section main body is placed.

With this configuration, the operator can carry out the main pulverization by placing the lifting part main body on the mounting part when the main pulverizer is seated on the fuel storage rack or when not in use. It is possible to improve the fit of the device and improve the workability of other operations performed around the crushing device.

In a preferred embodiment of the present invention, the vibration applying section is a cylinder including a piston rod that electrically moves up and down along a substantially vertical direction.

With this configuration, the operator can set the amplitude and frequency of the vibration applying part in advance, and accordingly adjust the rotation angle of the hammer body and the impact force from the contact part. It becomes possible to do so.

In a preferred embodiment of the present invention, the hammer portion has a biasing portion that biases the contact portion toward an inner wall of the one rack cell.

With such a configuration, the operator can always perform a stable striking operation while having the biasing part absorb the reaction force received when the contact part collides with the inner wall.

In a preferred embodiment of the present invention, a fixing means is connected to the support part and inserted into another rack cell different from the one rack cell through which the hammer part is inserted,
The fixing means includes a pressing means that presses the abutment part against the inner wall of the one rack cell via the support part and the insertion part by pressing the inner wall of the other rack cell.

With this configuration, the operator can use the pressing means to more reliably apply the impact force from the abutting portion to the rubble, and also prevent the position of the entire crushing device from shifting due to repeated impact operations. It becomes possible to suppress the

In a preferred embodiment of the present invention, the insertion portion includes a camera portion provided above the insertion portion and capable of photographing the contact portion inserted into the one rack cell.

With this configuration, the operator can visually check whether the contact part is in proper contact with the inner wall of the object and whether the striking operation can be performed properly. Become.

According to the present invention, it is possible to provide a device that can safely crush obstacles when taking out spent fuel from a fuel storage rack.

1 is an overall perspective view of a crushing device according to an embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a crushing device according to an embodiment of the present invention, showing (A) a front view and (B) a right side view. FIG. 2 is an explanatory diagram of the operation of the crushing device according to the embodiment of the present invention. FIG. 2 is an explanatory diagram of the operation of the crushing device according to the embodiment of the present invention. FIG. 2 is an explanatory diagram of how to use the crushing device according to the embodiment of the present invention. FIG. 2 is an explanatory diagram of how to use the crushing device according to the embodiment of the present invention. FIG. 2 is an explanatory diagram of how to use the crushing device according to the embodiment of the present invention. FIG. 2 is an explanatory diagram of how to use the crushing device according to the embodiment of the present invention. FIG. 2 is an explanatory diagram of how to use the crushing device according to the embodiment of the present invention. FIG. 2 is an explanatory diagram of how to use the crushing device according to the embodiment of the present invention. FIG. 2 is an explanatory diagram of how to use the crushing device according to the embodiment of the present invention.

A crushing apparatus according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 11. In addition, the embodiment shown below is an example of this invention, and this invention is not limited to the following embodiment. Moreover, in these figures, the code|symbol X shows the crushing apparatus based on this embodiment.

In addition, in Figures 1 to 11, drawings of air hoses and hydraulic hoses for supplying compressed gas, hydraulic oil, etc. to various parts, wiring for video and other signal transmission, power supply, etc. are omitted. Appropriate connections for these tubes and wires will be readily understood by those skilled in the art.

The crushing device It is.
Here, for convenience of explanation below, the x-axis direction shown in FIG. 1 will be referred to as the front-rear direction, the y-axis direction as the left-right direction, and the z-axis direction as the vertical direction. is referred to as the left side, and the arrow side in the z-axis direction is referred to as the upper side.

As shown in FIGS. 1 and 2, the crushing device An insertion part B that is inserted and supported inside, a control mechanism C that controls the operation of the hammer part A, a support part D that supports the insertion part B and the control mechanism C; It includes a lifting part E for lifting the mechanism C, and a fixing means F connected to the support part D and inserted into the rack cell r different from the rack cell r into which the hammer part A is inserted.
In addition, in FIG. 1, a main connecting rope E2 and a sub connecting rope E3, which will be described later, are omitted.
Further, the crushing device X in FIG. 1 is shown in a state before it is lifted up by the lifting part E, and the crushing device X in FIG. 2 is shown in the state when it is lifted up from the lifting part E.

The hammer parts A are formed as a substantially thin plate-like body as a whole, and four hammer parts A are provided at substantially the same intervals along the vertical direction.
Note that a more specific configuration of the hammer portion A will be described later using FIG. 3.

The insertion part B includes a pair of elongated insertion part main bodies B1 extending vertically downward from the bottom surface of a base part D1, which will be described later, and four shaft supports that rotatably support each hammer part main body A1, which will be described later. B2, a camera part B3 provided at the upper end of each insertion part main body B1, and a tapered part B4 provided at the lower end of each insertion part main body B1.

Each of the insertion portion main bodies B1 is configured as a substantially thin plate-like body having a rectangular shape when viewed from the side, and is connected to the bottom surface of the base portion D1 so that the respective side surfaces thereof face each other.
Moreover, each hammer part A is provided between each insertion part main body B1, and the surface direction of each insertion part main body B1 and the surface direction of each hammer part A are made substantially parallel.

Each shaft support B2 extends in the left-right direction (substantially perpendicular to the surface direction of each insertion part main body B1), and penetrates each insertion part main body B1 and each hammer part A interposed therebetween. It is provided.

The camera section B3 is a waterproof underwater camera, and like the hammer section A, is provided between each insertion section main body B1.
In addition, the camera part B3 has a photographing lens (not shown) facing vertically downward, so that the hammer part A located at the uppermost position among the hammer parts A inserted through the rack cell r will be described later. It is configured to be able to photograph the contact portion A2.

The tapered portion B4 is configured as a substantially square pyramid-shaped body that becomes sharp toward the bottom.
With this configuration, the operator can smoothly insert each insertion portion main body B1 into the rack cell r.

The control mechanism C includes a reciprocating part C1 that is inserted into the rack cell r together with the hammer part A and the insertion part B, and a vibration imparting part C2 that moves the reciprocating part C1 up and down along the vertical direction.

The reciprocating part C1 includes a reciprocating part main body C11 connected to the vibration applying part C2, and four connecting parts C12 (see FIG. 3) that connect the reciprocating part main body C11 and each hammer part main body A1. .

The reciprocating part main body C11 includes a first reciprocating part main body C11a, which is a pair of elongated bodies, and a first reciprocating part main body C11a, which is provided adjacent to the rear of each of the insertion part main bodies B1. and a second reciprocating portion main body C11b held between.

Each first reciprocating part main body C11a, like each insertion part main body B1, is configured as a substantially rectangular thin plate-like body when viewed from the side, and each hammer part A is interposed therebetween.
That is, the surface direction of each insertion portion main body B1 and the surface direction of each first reciprocating portion main body C11a are substantially parallel.

The second reciprocating portion main body C11b is a block body that is provided through the base portion D1 and has a substantially L-shape when viewed from the side. It is held between the reciprocating portion main body C11a.
Further, a slight gap is provided between the outer periphery of the second reciprocating part main body C11b and a through hole (not shown) of the base part D1 through which the second reciprocating part main body C11b passes. Accordingly, the second reciprocating portion main body C11b can move up and down in the vertical direction within a predetermined range.

In addition, in the part where the second reciprocating part main body C11b is sandwiched by each first reciprocating part main body C11a, there are three A joint j is provided.
Each joint j can be configured, for example, by a bolt or the like that passes through each first reciprocating part main body C11a and second reciprocating part main body C11b.

Each connecting portion C12 is a substantially cylindrical body suspended between each first reciprocating portion main body C11a, and extends in the same direction (left-right direction) as the shaft support B2.
Note that a substantially square plate-shaped cover member k is fitted into the outer surface of each first reciprocating portion main body C11a so as to cover both ends of each connecting portion C12.

In this embodiment, the vibration applying section C2 is a so-called double-acting air cylinder that includes a piston rod C21 that electrically moves up and down along the vertical direction.
To be more specific, the vibration imparting section C2 includes a piston rod C21, a housing section C22 in which a cylinder mechanism etc. (not shown) for vertically moving the piston rod C21 is built-in, and a connection extending from above the housing section C22. A pipe C23 is included.
Note that the vibration applying section C2 may be a hydraulic cylinder or an electric cylinder.

The piston rod C21 is connected to the rear end portion of the upper surface of the second reciprocating portion main body C11b that protrudes above the base portion D1.

The casing portion C22 has a substantially cylindrical stepped shape, and is fixed to an upright portion D2, which will be described later, via a pair of elongated fixing fittings m provided to cover the outer periphery of the casing portion C22.

The inside of the connecting pipe C23 communicates with the inside of the housing section C22.
Further, an air hose (not shown) that connects the above-described cylinder mechanism and an air pump (not shown) separately installed outside is connected to one end of the connection pipe C23 by a coupler or the like.
Thereby, compressed air supplied from the air pump passes through each air hose and is supplied to the cylinder mechanism, thereby allowing the piston rod C21 to move up and down.

The support section D includes a substantially flat base section D1 that is seated on the fuel storage rack R, an upright section D2 that stands up from the rear end of the top surface of the base section D1, and a top surface of the upright section D2. A pair of mounting parts D3 erected from the left and right ends of the pipe support part D4 extending from the rear end of the upper surface of the erected part D2, and connected to the upper ends of the left and right sides of the erected part D2. It has a pair of lifting bracket holding parts D5 and a hose hook part D6 connected to each mounting part D3.

The base portion D1 has a first base portion D11 having a substantially rectangular shape elongated in the front-rear direction, to which the insertion portion main body B1 and the fixing means F are connected, and an upright portion D2 on the top surface of the base portion D1. and a substantially rectangular second base portion D12 that is long in the left-right direction.

The upright portion D2 has a substantially rectangular cylindrical shape, and a reinforcing rib portion e for stably fixing the upright portion D2 onto the second base portion D12 is provided at the lower part thereof.

Each placing part D3 includes a placing part main body D31 provided with a slit in the upper part into which a first lifting part main body E11 described later is inserted, and an auxiliary placing part protruding outward from each placing part main body D31. It is composed of a section D32.

Each of the mounting portion main bodies D31 is formed as a substantially thin plate-like body, and is provided in the upright portion D2 so that its surface direction is substantially parallel to the front-rear direction.
Further, each of the mounting portion main bodies D31 is configured to have a substantially Y-shape in side view by having sloped portions facing the slits formed in the front and back directions on the upper portion thereof.
With this configuration, the operator can smoothly insert the first lifting portion main body E11 into the slit.

Each of the auxiliary placement parts D32 is configured as a substantially thin plate-like body having a substantially L-shape when viewed from the front, and the left and right ends of the first lifting part main body E11 when the first lifting part main body E11 is inserted into the slit. supports the load of

The pipe support portion D4 is erected from an approximately thin plate-like extension portion D41 and an extension portion D42 extending rearward from the upper surface of the upright portion D2, and has an approximately inverted L shape when viewed from the side. and a pipe support main body D42 having a substantially thin plate shape.

As shown in FIG. 2(B), the pipe support main body D42 abuts and supports the connection pipe C23 (and the connection pipe P13, which will be described later) from below.

Each lifting bracket holding portion D5 is configured as a substantially thin plate-like body having a substantially inverted L shape when viewed from the front, and a lifting bracket w to which a main connecting cable E2 to be described later is fastened is provided at the front end thereof. It is being

Here, the lifting brackets w are provided not only on each lifting bracket holding part D5 but also on the left and right sides of the upper surface of the first base part D11, and on the upper front side of the second reciprocating part main body C11b.
Moreover, each lifting bracket w is configured as a substantially thin plate-like body provided with connection holes to which the main connection rope E2 and the sub-connection rope E3 are attached.

The hose hook portion D6 is configured as a substantially prismatic body having a substantially U-shape that opens forward when viewed from above.
Further, an air hose and a hydraulic hose, which will be described later, are tied together with a binding material or the like and then hooked onto the hose hook portion D6.

The lifting section E includes a lifting section main body E1 to which a predetermined lifting machine (not shown) is locked, a main connecting rope E2 connecting the lifting section main body E1 and the support section D, and a reciprocating movement with the lifting section main body E1. It has an auxiliary connecting cable E3 that connects the main body C11.

The lifting part main body E1 includes a first lifting part main body E11 having a substantially thin plate shape, a second lifting part main body E12 located below the first lifting part main body E11, a first lifting part main body E11, and a second lifting part main body E11. and a connector E13 that connects the connector E12.

The first lifting part main body E11 is provided with a locking hole h into which a lifting machine is locked.

The second lifting portion main body E12 is provided with a connecting hole to which the main connecting rope E2 and the sub connecting rope E3 are attached.
The second lifting part main body E12 has a main part E12a to which a connecting tool E13 is attached and a connecting hole is provided in the front-rear direction, and a main part E12a is provided on the front end surface of the main part E12a, and a connecting hole is provided in the left-right direction. It is composed of an auxiliary part E12b.

The connecting tool E13 is configured as a so-called eggplant that connects the first lifting part main body E11 and the second lifting part main body E12 so as to be relatively rotatable about the vertical direction.

In this embodiment, four main connecting ropes E2 are provided, each of which is composed of a wire rope-shaped main connecting rope body E21 and a pair of connecting rings E22 to which both ends of the main connecting rope body E21 are fastened. has been done.
In addition, the two main connecting cables E2 each have their respective connecting rings E22 attached to the connecting hole of the lifting bracket w provided in each lifting bracket holding part D5 and the rear connecting hole of the main part E12a. The lifting portion main body E1 and the support portion D are connected to each other.
Furthermore, in the remaining two main connecting cables E2, each connecting ring E22 is attached to the connecting hole of the lifting bracket w provided in the first base part D11 and each connecting hole of the auxiliary part E12b. This connects the lifting part main body E1 and the support part D.

In this embodiment, one sub-connection rope E3 is provided, and is composed of a wire rope-shaped sub-connection rope main body E31 and a pair of connection rings E32 to which both ends of the sub-connection rope main body E31 are fastened. .
In addition, the sub-connection rope E3 can be lifted by attaching each connection ring E32 to the connection hole of the lifting bracket w provided in the second reciprocating part main body C11b and the connection hole in the front of the main part E12a. The section main body E1 and the reciprocating section main body C11 are connected.

The fixing means F has a pair of side wall parts F1 extending vertically downward from the bottom surface of the base part D1, and a pressing means P interposed between each side wall part F1.
Note that a more specific configuration of the pressing means P will be described later using FIG. 4.

Each side wall portion F1 includes a side wall portion main body F11 configured as a substantially thin plate-like body, and a tapered portion F12 connected to the lower end portion of the side wall portion main body F11.

Each side wall main body F11 is provided at a predetermined interval in the left-right direction so that its surface direction is substantially parallel to the front-back direction.

Each of the tapered portions F12 is inclined inward, so that the pair of tapered portions F12 as a whole has a tapered shape that becomes sharper toward the lower end.
With this configuration, the operator can smoothly insert the fixing means F into the rack cell r.

The configuration and operation of the hammer section A will be described in detail below with reference to FIG.
In addition, each upper figure of FIG. 3 is a partially enlarged view of FIG. , are shown with cover member k excluded.
Moreover, in each upper figure of FIG. 3, the main connecting rope E2, the sub connecting rope E3, and the lifting bracket w to which these are connected are omitted.
Moreover, each lower figure of FIG. 3 is a partially enlarged view showing only the hammer part A and the connecting part C12 in each upper figure.

As shown in FIG. 3, the hammer portion A includes a hammer portion main body A1 connected to the insertion portion main body B1, and a contact portion A2 provided on the hammer portion main body A1 and capable of abutting against the inner wall of the rack cell r. , and a biasing portion A3 that biases the contact portion A2 toward the inner wall of the rack cell r.
Note that, for convenience of explanation, the configuration of the uppermost hammer part A will be described below, but the other hammer parts A have the same configuration except that a compression spring part A4, which will be described later, is not provided.

The hammer main body A1 is rotatably supported by a shaft support B2.
Further, the hammer body A1 is provided with a loose fitting hole A11, through which the connecting portion C12 is inserted, at a predetermined distance rearward from the portion through which the shaft support B2 passes.
The loose fitting hole A11 is configured to have a substantially elliptical shape when viewed from the side, so that the connecting portion C12 having a substantially cylindrical shape is inserted into the loose fitting hole A11 with play.

The contact portion A2 extends from the bottom of the hammer body A1 toward the front.
Note that the hammer portion A is configured as a generally plate-shaped body having approximately the same thickness as a whole, including the hammer portion main body A1 and the contact portion A2.

The biasing portion A3 is a plate spring that is provided at the rear of the hammer body A1 and is curved toward the rear in a substantially dogleg shape, and abuts on an inner wall opposite to the inner wall that the abutment portion A2 abuts. This biases the contact portion A2.

The compression spring portion A4 is provided only in the uppermost hammer portion A, and is provided above the hammer portion main body A1 so as to protrude toward the front similarly to the contact portion A2.
Further, the compression spring portion A4 is configured to be able to come into contact with the inner wall of the rack cell r, similarly to the contact portion A2.

The hammer section A configured as described above operates as follows by the control mechanism C.
That is, when the piston rod C21 moves downward from the state shown in FIG. 3(A), the second reciprocating part main body C11b connected to the piston rod C21 moves downward and is connected to the second reciprocating part main body C11b. The first reciprocating portion main body C11a that has been moved moves downward.
Then, the first reciprocating portion main body C11a presses the hammer portion main body A1 downward via the connecting portion C12.
As a result, the hammer main body A1 rotates clockwise as seen from the right side about the shaft support B2 (propulsive force directed toward the inner wall is applied), resulting in the state shown in FIG. 3(B). .

Further, when the piston rod C21 of the vibration applying part C2 moves upward from the state shown in FIG. 3(B), the first reciprocating part body C11a moves the hammer part main body A1 upward via the connecting part C12 and pull it up.
As a result, the hammer main body A1 rotates counterclockwise as seen from the right side about the shaft support B2, and enters the state shown in FIG. 3(A).
Note that, hereinafter, the state of the hammer part A shown in FIG. 3(A), ie, the state in which the contact part A2 extends from the hammer part main body A1 in a substantially horizontal direction, will be referred to as an initial state.

In this way, the vibration imparting portion C2 (piston rod C21) imparts reciprocating vibration motion in the vertical direction to the reciprocating portion main body C11, and this reciprocating vibration motion is applied to the hammer portion main body by the shaft support B2 and the connecting portion C12. It is converted into a rotational vibration motion of A1.

In addition, in FIG. 3 (and FIG. 11), for convenience of explanation, the travel distance of the reciprocating vibration operation and the rotation angle of the rotary vibration operation accompanying this are exaggerated, but in reality, they are much smaller. This is the moving distance and rotation angle.

Specifically, for example, the piston rod C21 moves up and down at high speed with an amplitude of about 1 mm and a frequency of about 9Hz to 10Hz, and the hammer body A1 moves at high speed with a small angle of about 5°. Performs rotational vibration motion.
Further, the operator can change the frequency and amplitude of the piston rod C21 to arbitrary values via a control panel described later.

Hereinafter, the configuration and operation of the pressing means P will be described in detail using FIG. 4.
Note that FIG. 4 is a partially enlarged view of FIG. 2(B), and each side wall portion F1 is shown in a transparent state by being drawn with a dotted line.

The pressing means P includes a cylinder P1, a lever portion P2, and a conversion mechanism P3 that connects the cylinder P1 and the lever portion P2.

In this embodiment, the cylinder P1 is a so-called double-acting hydraulic cylinder that includes a piston rod P11 that electrically moves up and down in the vertical direction.
More specifically, the cylinder P1 includes a piston rod P11, a cylinder mechanism P12 including a cylinder tube t1 that stores the piston rod P11, a front and rear cover t2, and a connecting pipe P13.
Note that the cylinder P1 may be an air cylinder or an electric cylinder.

A guide rail P31, which will be described later, is provided at the tip of the piston rod P11.

The cylinder mechanism P12 is connected to the bottom surface of the base portion D1 so as to extend vertically downward.

The connecting pipes P13 are provided inside the front and rear covers t2 and the above-mentioned upright portion D2, respectively.
Further, at one end of the connection pipe P13 provided inside the upright portion D2, there is a hydraulic hose (not shown) that connects the cylinder mechanism P12 and a hydraulic pump (not shown) separately installed outside. , connected via a coupler.

Furthermore, the connecting pipe P13 provided on the front and rear covers t2 and the connecting pipe P13 provided inside the upright portion D2 are also connected by hydraulic hoses via couplers.
In addition, this hydraulic hose is pulled out to the end of each connection pipe P13 by being inserted into a through hole (not shown) provided in the base part D1 or the standing part D2, for example.
Thereby, the hydraulic oil supplied from the hydraulic pump is supplied to the cylinder mechanism P12 through each hydraulic hose, thereby enabling the piston rod P11 to move up and down.

The lever part P2 is suspended between a lever part main body P21, which is a plate-like body having an approximately dogleg shape when viewed from the side, and each side wall part F1, and has a rotation shaft P22 that rotatably supports the lever part main body P21. It is composed of.

The lever main body P21 is configured to be rotatable in the same direction as the hammer part A by being pivotally supported by a rotation shaft P22 extending along the left-right direction.

The conversion mechanism P3 is provided at the tip of the piston rod P11, and is provided on a guide rail P31 that reciprocates together with the piston rod P11, and on the upper part of the lever main body P21, and is slidable in the front-rear direction along the guide rail P31. and a fitted cam follower P32.

The pressing means P configured as described above operates as follows by means of a hydraulic pump.
That is, when the guide rail P31 moves downward together with the piston rod P11 from the state shown in FIG. Rotates counterclockwise when viewed from the side.
As a result, the lower part of the lever main body P21 protrudes from each side wall F1 in a side view, resulting in the state shown in FIG. 4(B).

Furthermore, when the guide rail P31 moves upward together with the piston rod P11 from the state shown in FIG. Rotates clockwise when viewed from the side.
Thereby, the lower part of the lever main body P21 becomes in a state where it is stored between each side wall part F1 when viewed from the side, resulting in the state shown in FIG. 4(A).

In this way, the reciprocating sliding motion of the cylinder P1 (piston rod P11) is converted into a rotating motion of the lever body P21 by the conversion mechanism P3.

Hereinafter, a method of using the crushing device X will be explained using FIGS. 5 to 11.
In addition, in the enlarged views shown in FIGS. 5 and 6, and in FIGS. 9 and after, each insertion part main body B1 and each first reciprocating part main body C11a are shown in a transparent state, and the cover member k is shown in a transparent state, similar to FIG. 3. Shown with exclusion.
Moreover, in the enlarged views shown in FIGS. 5 and 6, the main connecting rope E2, the lifting bracket w connected thereto, and the fixing means F are omitted.
Further, in the right side views shown in FIG. 8 and subsequent figures, the fuel storage rack R and the channel box fb are shown in cross-sectional views taken along the line PP′ shown in FIG.

Here, the operator controls the operation of the vibration applying section C2 by the air pump and the operation of the cylinder P1 by the hydraulic pump using an externally installed control panel (not shown), a solenoid valve (not shown), etc. Can be controlled remotely via.
Further, the operator can also view the image captured by the camera unit B3 via, for example, a display monitor (not shown) provided near the control panel.

First, from the state shown in FIG. 5, the operator locks a lifting device such as a crane truck into the locking hole h of the first lifting portion main body E11, and lifts up the crushing device X.
In addition, when the crusher X is not in use, as shown in FIG. are placed on each placing portion D3 by being inserted into each slit.

Here, the crushing device X is lifted by the lifting machine, and changes from the state shown in FIG. 5 to the state shown in FIG. 6.

To be more specific, in a state where the crushing device It is said to be in a rotated state.

Then, when the crushing device X is lifted by the lifting machine, a predetermined tension is generated in the sub-connection cable E3, and the reciprocating portion main body C11 moves upward due to this tension.
As a result, each hammer main body A1 is moved in a direction (in this embodiment (counterclockwise) to return to the initial state.

In addition, in this embodiment, when each hammer part A is in the initial state, the distance from the front end surface of each hammer part A (each contact part A2) to the rear end part (top) of each biasing part A3 is The distance is configured to be approximately the same as the width of the rack cell r along the front-rear direction.
With this configuration, the operator can smoothly insert the insertion part B etc. into the rack cell r1, and also quickly bring each contact part A2 into contact with the inner wall of the rack cell r. It can be a state.

Next, as shown in FIG. 7, the operator transports the crushing device X to the fuel storage rack R using a lifting machine.

Hereinafter, for convenience of explanation, the rack cell r into which the hammer part A, the insertion part main body B1, and the reciprocating part C1 are inserted will be called a rack cell r1, and the rack cell r into which the fixing means F is inserted will be called a rack cell r2. Rack cell r1 and rack cell r2 are rack cells r that are adjacent to each other in the front-rear direction.
Although not shown in FIG. 7, the rack cell r adjacent to the front of the rack cell r1 has a channel box fb (spent fuel, 8 etc.) has been inserted.

Next, as shown in FIG. 8(A), the operator places the crushing device X in the fuel storage rack R using a lifting machine.
Specifically, the operator inserts the hammer part A, the insertion part main body B1, and the reciprocating part C1 (the first reciprocating part main body C11a, the connecting part C12) into the rack cell r1, and inserts the fixing means F into the rack cell r2. and seat the base portion D1 on the fuel storage rack R.

Next, as shown in FIG. 8(B), the operator places the first lifting part body E11 on each placing part D3 by inserting it into each slit using a lifting machine.
At this time, each of the contact portions A2 and each of the biasing portions A3 abuts on each of the inner walls facing each other in the front-rear direction of the rack cell r1, so that each of the hammer portions A is in an initial state.

Next, as shown in FIG. 9A, the operator activates the hydraulic pump and moves the piston rod P11 downward to cause the lever body P21 to protrude from each side wall F1 using the conversion mechanism P3. let
As a result, the lever main body P21 presses the inner wall of the rack cell r2, and the resulting reaction force is transmitted to the entire crushing device X, so that each contact portion A2 is pressed against the inner wall of the rack cell r1.

Further, as shown in FIG. 9(B), the operator confirms that the compression spring part A4 of the uppermost hammer part A is contracted through the image taken by the camera part B3. .
That is, when the compression spring part A4 is contracted, it indicates that the compression spring part A4 is in contact with the inner wall of the rack cell r1. From this, the operator can ensure that the contact part A2 is in contact with the inner wall of the rack cell r1. You can confirm that it is in contact with the
In this way, in the uppermost hammer part A, the compression spring part A4 is provided above the contact part A2, so that, for example, it is difficult to visually recognize the contact part A2 in turbid water. Even if there is, it becomes easy to confirm the contact state of the contact part A2 via the camera part B3.

Here, as shown in FIG. 10, the channel box fb covering the spent fuel is fastened to the fuel assembly by a channel fastener cf located at one corner of its upper end.
The channel fastener cf is a device that not only connects the channel box fb and the fuel assembly with its screw, but also has a pair of leaf springs on two sides for the purpose of maintaining the mutual spacing between the fuel assemblies in a nuclear reactor. .

Further, as shown in FIG. 10, the rack guide portion Lg provided at the upper end of the partition wall p that separates the plurality of rack cells r is usually designed in consideration of the convenience of inserting the channel box fb (spent fuel). , a slope is formed that narrows toward the upper and lower ends.
Furthermore, the rack guide section Lg at the top of the fuel storage rack R (bulkhead p) is narrower than the inner diameter of the rack cell r, and the leaf spring of the channel fastener cf comes into contact with the rack guide section Lg during normal fuel removal. The fuel is taken out as it is pushed and flexed inward.

From the configuration of the channel fastener cf and the partition wall p as described above, for example, as shown in FIG. ), even if the plate spring of the channel fastener cf contacts the rack guide portion Lg, the plate spring cannot be pushed down due to the presence of the obstacle ob.
As a result, the channel box fb (spent fuel) cannot pass through the rack guide portion Lg, which impedes the work to take out the channel box fb (spent fuel).

Therefore, after bringing the crushing device X into the state shown in FIG. 9, the operator performs a striking action of striking the inner wall of the rack cell r1 with the contact portion A2.

More specifically, the operator activates the air pump and causes the vibration applying section C2 (piston rod C21) to reciprocate and vibrate, thereby rotationally vibrating the hammer section A.
That is, as the piston rod C21 moves upward, the hammer part A rotates counterclockwise against the urging force of the urging part A3 (FIG. 11(A)).
Then, as the piston rod C21 moves downward, the hammer part A rotates clockwise as it receives the urging force of the urging part A3 and is given a propulsive force toward the inner wall. Hit the front inner wall (Figure 11(B))

At this time, the piston rod C21 repeats minute vibrations with the amplitude and frequency described using FIG. 3, and the hammer body A1 repeats the minute clockwise and counterclockwise rotations described above.
As a result, the contact part A2 repeatedly hits the front inner wall of the rack cell r1, and the impact force of the contact part A2 is transmitted to the obstacle ob via the front inner wall, thereby crushing the obstacle ob. .

Further, in the above, for convenience of explanation, only the striking operation of the uppermost hammer part A has been described in detail, but each of the other hammer parts A also executes the same striking action as above at the same time as the uppermost hammer part A. That will happen.
As a result, other obstacles ob caught between the channel box fb and the partition wall p are also crushed by the impact force of each of the other contact portions A2.
In addition, in FIG. 11(B), the contact portion A2 collides with the inner wall while extending from the hammer body A1 in a substantially horizontal direction; It may be configured so that it collides with the inner wall in a state where the installation direction is slightly upward or downward.

By the above-described striking action of each hammer part A, the plurality of obstacles ob caught between the channel box fb and the partition wall p (or the channel box fb and the channel fastener cf) are crushed, and the operator can smoothly remove the spent fuel. can be taken out.

In addition, if there is an obstacle ob between the channel box fb and another partition p, the operator must release the pressing state of the pressing means P using the hydraulic pump, and then start the crushing work 1 using the lifting machine. Lift up.
Then, the operator inserts the insertion portion B etc. into another rack cell r formed by another partition p, and performs the same striking operation as described above.

According to this embodiment, the operator can crush the obstacle ob by performing the required number of striking operations with the hammer part A using the control mechanism C, and can smoothly perform the work of removing the spent fuel. becomes possible.

In addition, the control mechanism C rotates the hammer body A1 around the shaft support B2 and causes the contact portion A2 to collide with the inner wall of the rack cell r1, so that the operator can use the centrifugal force of the hammer body A1 to It becomes possible to more efficiently apply the impact force accompanying the collision of the contact portion A2.

In addition, the operation of the vibration imparting part C2 and the reciprocating part C1 allows the operator to easily and continuously perform the striking action with the contact part A2, which improves the workability of crushing the obstacle ob. improves.

In addition, the worker can use the plurality (four) hammer parts A provided along the substantially vertical direction to strike the plurality of obstacles ob between the channel box fb and the rack cell r at once. A force can be applied, and the workability of crushing obstacles ob is further improved.

Moreover, the lifting part E allows the operator to easily carry out the work of transporting the crushing device X to the fuel storage rack R and the work of removing it.

In addition, the hammer main body A1 can be rotated clockwise with the crusher X lifted by the sub-connection cable E3 which generates a predetermined tension while the crusher X is lifted, and the operator can: It is possible to smoothly insert the insertion portion B into the rack cell r1.

In addition, by placing the lifting part body E1 on the placing part D3, the operator can place the lifting part main body E1 on the placing part D3 when the crushing device X is seated on the fuel storage rack R or when not in use. It is possible to improve the fit of the crusher X and improve the workability of other operations performed around the crusher X.

In addition, since the vibration applying section C2 is an air cylinder, the operator can set the amplitude and frequency of the vibration applying section C2 in advance, and accordingly, the rotation angle and the hitting force of the hammer body A1 can be set in advance. It becomes possible to adjust the impact force by the contact portion A2.

In addition, the biasing portion A3 allows the operator to always perform a stable striking action while absorbing the reaction force received when the contact portion A2 collides with the inner wall.

In addition, the pressing means P allows the operator to more reliably apply the impact force from the contact portion A2 to the rubble, and also suppresses fluctuations in the overall position of the crushing device X due to repeated impact operations. It becomes possible.

In addition, the camera section B3 allows the operator to visually check whether the contact section A2 is in proper contact with the inner wall of the object and whether the striking operation can be performed appropriately. .

Note that the shapes, dimensions, etc. of each component shown in the above-described embodiments are merely examples, and can be variously changed based on design requirements and the like.

For example, in this embodiment, the number of hammer parts A is four, but it may be three or less, or five or more. Also, the number of shaft supports B2 and connecting portions C12 is changed.

X Crushing device A Hammer part B Insertion part C Control mechanism D Support part E Lifting part F Fixing means R Fuel storage rack r Rack cell fb Channel box (spent fuel)
cf channel fastener ob obstruction

Claims (11)

A crushing device for crushing objects that become an obstacle when taking out a channel box from a fuel storage rack composed of a plurality of rack cells,
a hammer part that is inserted into the one rack cell; an insertion part that inserts and supports the hammer part into the first rack cell; a control mechanism that controls the operation of the hammer part; and a control mechanism that controls the insertion part and the control mechanism. A supporting portion for supporting the
The hammer part has a hammer part main body connected to the insertion part, and a contact part provided on the hammer part main body and capable of contacting an inner wall of the one rack cell,
In the crushing device, the control mechanism causes the contact portion to collide with the inner wall of the one rack cell by applying a propulsive force toward the inner wall to the hammer portion main body. The insertion part has a pivot support that rotatably supports the hammer part main body,
The crushing device according to claim 1, wherein the control mechanism causes the contact portion to collide with an inner wall of the one rack cell by rotating the hammer portion main body around the shaft support. The pivot support extends substantially horizontally,
The control mechanism includes a reciprocating part that is inserted into the one rack cell together with the hammer part and the insertion part, and a vibration imparting part that moves the reciprocating part up and down along a substantially vertical direction,
The reciprocating part includes a reciprocating part main body connected to the vibration applying part, and a connecting part connecting the reciprocating part main body and the hammer part main body,
The crushing device according to claim 2, wherein the hammer main body is rotated around the shaft support by vertical movement of the connecting portion via the vibration applying portion. The insertion part and the reciprocating part are elongated bodies extending substantially vertically,
A plurality of the shaft supports are provided in the insertion portion along a substantially vertical direction,
The reciprocating portion is provided with a plurality of the connecting portions along a substantially vertical direction,
A plurality of the hammer main bodies are provided along a substantially vertical direction,
4. The plurality of hammer part bodies are each connected to the insertion part via one of the shaft supports, and connected to the reciprocating part via one of the coupling parts. crushing equipment. a lifting part for lifting the insertion part and the control mechanism via the support part,
The crushing device according to claim 3 or 4, wherein the lifting section has a lifting section main body to which a predetermined lifting machine is locked, and a main connecting cable connecting the lifting section main body and the support section. The lifting part has a sub-connection cable that connects the lifting part main body and the reciprocating part main body,
A predetermined tension is generated in the sub-connection rope in a state in which the insertion portion and the control mechanism are lifted,
The reciprocating part main body is configured to be movable upward by the tension,
The pulverizer according to claim 5, wherein the hammer part main body rotates in a direction in which the abutting part moves away from an inner wall that is a collision target of the one rack cell due to movement of the reciprocating part main body based on the tension. Device. The crushing device according to claim 5 or 6, wherein the support section has a placement section on which the lifting section main body is placed. The crushing device according to any one of claims 3 to 7, wherein the vibration applying section is a cylinder including a piston rod that electrically moves up and down along a substantially vertical direction. The crushing device according to any one of claims 1 to 8, wherein the hammer portion has a biasing portion that biases the contact portion toward the inner wall of the one rack cell. comprising a fixing means connected to the support part and inserted into another rack cell different from the one rack cell through which the hammer part is inserted;
2. The fixing means includes a pressing means for pressing the contact portion against the inner wall of the one rack cell via the support portion and the insertion portion by pressing the inner wall of the other rack cell. The crushing device according to any one of 1 to 9. The crushing device according to any one of claims 1 to 10, wherein the insertion part has a camera part provided above the insertion part and capable of photographing the contact part inserted into the one rack cell.