Crushing equipment

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

[Technical Field]

[0001] The present invention relates to an apparatus for breaking up obstacles during spent fuel removal operations. [Background technology]

[0002] 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 debris from the reactor building damaged by the explosion was scattered as rubble on the fuel storage racks in the spent fuel pool.

[0003] The rubble had gotten into the gaps between the channel box covering the fuel assemblies and the channel fasteners fastening the channel box to the fuel assemblies, as well as the gaps between the channel box and the rack cell, hindering the work of removing the spent fuel.

[0004] However, there has never been a suitable device to safely remove the rubble that has gotten into the gaps between the channel box and the channel fastener, and between the channel box and the rack cell on the fuel storage rack, which is located in a special location at a depth of approximately 7 meters in the spent fuel pool. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] none Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been made in consideration of the above-mentioned circumstances, and an object to be achieved is to provide an apparatus that can safely crush obstacles that occur when removing spent fuel from a fuel storage rack. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides a crushing device for crushing objects that obstruct the removal of spent fuel from a fuel storage rack that is composed of a plurality of rack cells, the device comprising: a hammer portion inserted into the one rack cell; an insertion portion that inserts and supports the hammer portion inside the one rack cell; a control mechanism that controls the operation of the hammer portion; and a support portion that supports the insertion portion and the control mechanism, the hammer portion has a hammer portion main body connected to the insertion portion, and a contact portion provided on the hammer portion main body and capable of contacting an inner wall of the one rack cell, The control mechanism applies a propulsive force to the hammer body toward the inner wall, causing the abutment portion to collide with the inner wall of the one rack cell.

[0008] According to the present invention, the control mechanism causes the abutment portion to collide with the inner wall of one rack cell, thereby making it possible to apply an impact force resulting from the collision of the abutment portion to rubble that has become lodged between the channel box and the rack cell in the rack cell adjacent to this rack cell. By performing this striking action the required number of times, the worker can crush the target rubble, allowing the channel box to be removed smoothly.

[0009] In a preferred embodiment of the present invention, the insertion portion has a pivot portion that rotatably supports the hammer body, The control mechanism rotates the hammer body around the pivot support portion to cause the abutment portion to collide with the inner wall of the one rack cell.

[0010] With this configuration, the worker can more efficiently apply the impact force that accompanies the collision of the contact portion by using the centrifugal force of the hammer body.

[0011] In a preferred embodiment of the present invention, the pivot support portion extends in a substantially horizontal direction, the control mechanism includes a reciprocating unit that is inserted into the one rack cell together with the hammer unit and the insertion unit, and a vibration applying unit that moves the reciprocating unit up and down in a substantially vertical direction, the reciprocating unit includes a reciprocating unit body connected to the vibration applying unit, and a connecting unit connecting the reciprocating unit body and the hammer unit body, The hammer body rotates around the pivot support portion due to the up and down movement of the connecting portion via the vibration applying portion.

[0012] With this configuration, the worker can easily and continuously perform impact operations with the contact part by operating the vibration imparting part and the reciprocating part, improving the workability of the rubble crushing work.

[0013] In a preferred embodiment of the present invention, the insertion portion and the reciprocating portion are elongated bodies extending substantially vertically, The insertion portion is provided with a plurality of the pivot support portions along a substantially vertical direction, The reciprocating portion is provided with a plurality of connecting portions along a substantially vertical direction, The hammer body is provided in a plurality of positions along a substantially vertical direction, Each of the plurality of hammer body members is connected to the insertion portion via one of the pivot support portions, and is connected to the reciprocating portion via one of the connecting portions.

[0014] With this configuration, it is possible to apply impact force all at once to multiple pieces of rubble that have entered the space between the channel box and the rack cell at a predetermined interval in the vertical direction, further improving the workability of the rubble crushing work.

[0015] In a preferred embodiment of the present invention, a lifting unit is provided that lifts the insertion unit and the control mechanism via the support unit, The lifting section has a lifting section body to which a predetermined lifting machine is attached, and a main connecting rope that connects the lifting section body and the support section.

[0016] With this configuration, the worker can easily transport the pulverizing device to the target fuel storage rack and remove it.

[0017] In a preferred embodiment of the present invention, the lifting unit has a sub-connecting rope connecting the lifting unit main body and the reciprocating unit main body, A predetermined tension is generated in the auxiliary connecting rope when the insertion portion and the control mechanism are lifted, The reciprocating unit body is configured to be movable upward by the tension, The hammer body rotates in a direction in which the contact portion moves away from the inner wall of the one rack cell that is the target of collision, due to the movement of the reciprocating body based on the tension.

[0018] With this configuration, when an operator lifts up the crushing device, the reciprocating unit body moves upward, and as a result, the hammer unit body rotates around the pivot support. Furthermore, since the hammer body rotates in a direction in which the abutment portion moves away from the inner wall of the object to be hit, it is possible to prevent the abutment portion from getting caught on the opening of the rack cell when inserting the insertion portion, etc. into the target rack cell. This allows the worker to smoothly perform the insertion work of the insertion portion or the like into the target rack cell.

[0019] In a preferred embodiment of the present invention, the support portion has a mounting portion on which the lifting portion main body is mounted.

[0020] With this configuration, when the pulverizer is seated on a fuel storage rack or when not in use, the worker can place the lifting unit body on the mounting unit, which allows the pulverizer to fit more snugly and improves the workability of other tasks performed around the pulverizer.

[0021] In a preferred embodiment of the present invention, the vibration applying unit is a cylinder including a piston rod that electrically moves up and down in a substantially vertical direction.

[0022] With this configuration, the operator can preset the amplitude and frequency of the vibration imparting part, which in turn allows them to adjust the rotation angle of the hammer body and the impact force of the abutment part.

[0023] In a preferred embodiment of the present invention, the hammer portion has a biasing portion that biases the contact portion toward the inner wall of the one rack cell.

[0024] With this configuration, the operator can always perform a stable impact operation while the biasing portion absorbs the reaction force received when the contact portion collides with the inner wall.

[0025] In a preferred embodiment of the present invention, the hammer unit further includes a fixing means connected to the support portion and inserted into another rack cell different from the one rack cell into which the hammer portion is inserted, The fixing means includes a pressing means that presses the inner wall of the other rack cell, thereby pressing the abutting portion against the inner wall of the one rack cell via the support portion and the insertion portion.

[0026] With this configuration, the operator can use the pressing means to more reliably apply impact force from the contact part to the rubble, and can also suppress fluctuations in the position of the entire crushing device due to repeated impact operations.

[0027] In a preferred embodiment of the present invention, the insertion portion has a camera portion provided above the insertion portion and capable of photographing the contact portion inserted into the one rack cell.

[0028] With this configuration, the worker can visually check whether the contact portion is in proper contact with the inner wall of the target and whether the impact action can be performed properly. [Effects of the Invention]

[0029] According to the present invention, it is possible to provide an apparatus that can safely crush obstacles that occur when removing spent fuel from a fuel storage rack. [Brief explanation of the drawings]

[0030] [Figure 1] 1 is an overall perspective view of a crushing device according to an embodiment of the present invention. [Figure 2] 1A and 1B are views showing a crushing device according to an embodiment of the present invention, in which (A) is a front view and (B) is a right side view. [Figure 3] 5A to 5C are explanatory diagrams illustrating the operation of the crushing device according to the embodiment of the present invention. [Figure 4] 5A to 5C are explanatory diagrams illustrating the operation of the crushing device according to the embodiment of the present invention. [Figure 5] 1 is an explanatory diagram of a method of using the crushing device according to an embodiment of the present invention. [Figure 6] 1 is an explanatory diagram of a method of using the crushing device according to an embodiment of the present invention. [Figure 7] 1 is an explanatory diagram of a method of using the crushing device according to an embodiment of the present invention. [Figure 8] 1 is an explanatory diagram of a method of using the crushing device according to an embodiment of the present invention. [Figure 9] 1 is an explanatory diagram of a method of using the crushing device according to an embodiment of the present invention. [Figure 10] 1 is an explanatory diagram of a method of using the crushing device according to an embodiment of the present invention. [Figure 11] 1 is an explanatory diagram of a method of using the crushing device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0031] A pulverizer according to an embodiment of the present invention will be described below with reference to Figures 1 to 11. Note that the embodiment shown below is an example of the present invention, and the present invention is not limited to the following embodiment. In these figures, the symbol X indicates the pulverizer according to this embodiment.

[0032] 1 to 11, air hoses and hydraulic hoses for supplying compressed gas, hydraulic oil, etc. to each part, and wiring for transmitting video and other signals, power supply, etc. are not shown, but the appropriate connection relationships of these pipes and wiring will be easily understood by those skilled in the art.

[0033] The crushing device X is a device for crushing obstacles ob (see Figure 8, etc.) that get in the way when removing the channel box fb (spent fuel, see Figure 8, etc.) from the fuel storage rack R (see Figure 7, etc.). For convenience of explanation, the x-axis direction shown in FIG. 1 will be referred to as the front-to-back direction, the y-axis direction as the left-to-right direction, and the z-axis direction as the vertical direction, and the side indicated by the arrow in the x-axis direction will be referred to as the front, the side indicated by the arrow in the y-axis direction as the left, and the side indicated by the arrow in the z-axis direction as the up.

[0034] As shown in Figures 1 and 2, the crushing device X includes a hammer portion A that is inserted into one of the rack cells r (see Figure 7, etc.) that constitutes the fuel storage rack R, an insertion portion B that inserts and supports the hammer portion A inside the rack cell r, a control mechanism C that controls the operation of the hammer portion A, a support portion D that supports the insertion portion B and the control mechanism C, a lifting portion E that lifts the insertion portion B and the control mechanism C via the support portion D, and a fixing means F that is connected to the support portion D and inserted into another rack cell r that is different from the one rack cell r into which the hammer portion A is inserted. In addition, a main connecting rope E2 and a sub connecting rope E3, which will be described later, are omitted in FIG. 1 shows the crushing device X in a state before it is lifted by the lifting part E, and FIG. 2 shows the crushing device X in a state after it is lifted by the lifting part E.

[0035] The hammer portion A is configured as a generally thin plate-like body, and four of them are provided at generally equal intervals along the vertical direction. The more specific configuration of the hammer part A will be described later with reference to FIG.

[0036] The insertion portion B has a pair of elongated bodies, insertion portion bodies B1, extending vertically downward from the bottom surface of the base portion D1 described later, four pivot support portions B2 that rotatably support each hammer portion body A1 described later, a camera portion B3 provided at the upper end of each insertion portion body B1, and a tapered portion B4 provided at the lower end of each insertion portion body B1.

[0037] Each of the insertion portion bodies B1 is configured as a generally thin plate-like body having a rectangular shape in a side view, and is connected to the bottom surface of the base portion D1 so that the respective side surfaces face each other. Further, the hammer portions A are provided between the insertion portion bodies B1, and the surface direction of each insertion portion body B1 and the surface direction of each hammer portion A are made to be approximately parallel.

[0038] Each of the pivot support portions B2 extends in the left-right direction (substantially perpendicular to the surface of each of the insertion portion bodies B1) and penetrates each of the insertion portion bodies B1 and each of the hammer portions A interposed therebetween.

[0039] The camera section B3 is a waterproof underwater camera, and like the hammer section A, is provided between the insertion section bodies B1. Furthermore, the camera unit B3 is configured so that its photographing lens (not shown) faces vertically downward, allowing it to photograph the contact portion A2 (described later) of the hammer portion A located at the top of each hammer portion A inserted into the rack cell r.

[0040] The tapered portion B4 is configured as a substantially quadrangular pyramid that becomes sharper downward. With this configuration, the worker can smoothly insert each insertion portion body B1 into the rack cell r.

[0041] The control mechanism C has 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 applying part C2 that moves the reciprocating part C1 up and down in the vertical direction.

[0042] The reciprocating section C1 includes a reciprocating section body C11 connected to the vibration applying section C2, and four connecting sections C12 (see FIG. 3) that connect the reciprocating section body C11 to each hammer section body A1.

[0043] The reciprocating portion body C11 is composed of a pair of elongated bodies, a first reciprocating portion body C11a, which is arranged adjacent to the rear of each insertion portion body B1, and a second reciprocating portion body C11b, which is sandwiched between each first reciprocating portion body C11a.

[0044] Like the insertion portion bodies B1, the first reciprocating portion bodies C11a are configured as substantially thin plate-like bodies having a rectangular shape in a side view, and the hammer portions A are interposed between the first reciprocating portion bodies C11a. That is, the surface direction of each insertion portion body B1 and the surface direction of each first reciprocating portion body C11a are made to be approximately parallel.

[0045] The second reciprocating part body C11b is a block body that is approximately L-shaped in side view and is provided to penetrate the base part D1, and the part that protrudes downward from the base part D1 is clamped between each of the first reciprocating part bodies C11a. In addition, there is a small gap between the outer periphery of the second reciprocating part body C11b and the through hole (not shown) of the base part D1 through which the second reciprocating part body C11b passes, which allows the second reciprocating part body C11b to move up and down in the vertical direction within a predetermined range.

[0046] In addition, in the portion where the second reciprocating part body C11b is clamped between each of the first reciprocating part bodies C11a, three joints j are provided to join each of the first reciprocating part bodies C11a and the second reciprocating part body C11b. Each joint j can be formed by, for example, a bolt or the like passing through each first reciprocating part body C11a and each second reciprocating part body C11b.

[0047] Each of the connecting portions C12 is a substantially cylindrical body suspended between the first reciprocating portion bodies C11a, and extends in the same direction (left-right direction) as the pivot support portion B2. A cover member k having a substantially rectangular plate shape is fitted onto the outer surface of each first reciprocating portion body C11a so as to cover both ends of each connecting portion C12.

[0048] 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. More specifically, the vibration applying section C2 includes a piston rod C21, a housing section C22 incorporating a cylinder mechanism (not shown) for moving the piston rod C21 up and down, and a connecting pipe C23 extending from above the housing section C22. The vibration applying unit C2 may be a hydraulic cylinder or an electric cylinder.

[0049] The piston rod C21 is connected to the rear end of the upper surface of the second reciprocating part body C11b that protrudes above the base part D1.

[0050] The housing portion C22 is configured in a stepped, generally cylindrical shape, and is fixed to the standing portion D2 (described later) via a pair of long fixing metal fittings m that are provided to cover the outer periphery of the housing portion C22.

[0051] The inside of the connection pipe C23 communicates with the inside of the housing C22. Furthermore, an air hose (not shown) that connects the above-mentioned cylinder mechanism to a separate, externally installed air pump (not shown) is connected to one end of the connection pipe C23 by a coupler or the like. As a result, compressed air supplied from the air pump is supplied to the cylinder mechanism through each air hose, thereby enabling the piston rod C21 to move up and down.

[0052] The support portion D has a substantially flat base portion D1 that sits on the fuel storage rack R, an upright portion D2 that stands upright from the rear end of the upper surface of the base portion D1, a pair of mounting portions D3 that stand upright from the left and right end portions of the upper surface of the upright portion D2, a pipe support portion D4 that extends from the rear end of the upper surface of the upright portion D2, a pair of lifting bracket holding portions D5 connected to the upper ends of the left and right side surfaces of the upright portion D2, and a hose hook portion D6 connected to each mounting portion D3.

[0053] The base part D1 is composed of a first base part D11, which is elongated in the front-to-back direction and has an approximately rectangular shape, and to whose bottom surface the insertion part main body B1 and the fixing means F are connected, and a second base part D12, which is elongated in the left-to-right direction and has an upright part D2 erected on its top surface.

[0054] The standing portion D2 is configured in a substantially rectangular tubular shape, and a reinforcing rib portion e is provided at the bottom thereof for stably fixing the standing portion D2 on the second base portion D12.

[0055] Each mounting section D3 is composed of a mounting section main body D31 having a slit at the top into which the first lifting section main body E11 described later is inserted, and an auxiliary mounting section D32 protruding outward from each mounting section main body D31.

[0056] Each of the placement portion bodies D31 is configured as a substantially thin plate-like body, and is provided on the standing portion D2 so that the surface direction thereof is substantially parallel to the front-rear direction. Each placement portion main body D31 has an inclined portion formed in the front-rear direction at the top thereof, which is directed toward the slit, and is configured to have a substantially Y-shape in side view. With this configuration, the worker can smoothly insert the first lifting part body E11 into the slit.

[0057] Each auxiliary loading portion D32 is configured as an approximately thin plate-like body that is approximately L-shaped when viewed from the front, and supports the load at the left and right ends of the first lifting portion main body E11 when the first lifting portion main body E11 is inserted into the slit.

[0058] The pipe support portion D4 is composed of an extension portion D41, which is approximately a thin plate-like body and extends rearward from the upper surface of the upright portion D2, and a pipe support portion main body D42, which is approximately a thin plate-like body and extends upright from the extension portion D42, and which has an approximately inverted L-shape in side view.

[0059] As shown in FIG. 2(B), the pipe support body D42 abuts against and supports the connection pipe C23 (and a connection pipe P13, which will be described later) from below.

[0060] Each lifting bracket holding portion D5 is configured as an approximately thin plate-like body that is approximately inverted L-shaped when viewed from the front, and at its front end is provided a lifting bracket w to which the main connecting rope E2 described later is fastened.

[0061] Here, the lifting brackets w are provided on the respective lifting bracket holding portions D5, as well as on the left and right sides of the upper surface of the first base portion D11 and on the front of the upper surface of the second reciprocating portion main body C11b. Each lifting bracket w is formed as a substantially thin plate-like body having connection holes to which the main connection rope E2 and the sub connection rope E3 are attached.

[0062] The hose hook portion D6 is configured as a substantially rectangular columnar body that is substantially U-shaped and opens forward when viewed from above. In addition, an air hose and a hydraulic hose (described later) are bound together with a separate fastening material or the like and then hooked onto the hose hook portion D6.

[0063] The lifting section E has a lifting section main body E1 to which a specified lifting machine (not shown) is attached, a main connecting rope E2 that connects the lifting section main body E1 to the support section D, and a secondary connecting rope E3 that connects the lifting section main body E1 to the reciprocating section main body C11.

[0064] The lifting section body E1 is composed of a first lifting section body E11 which is an approximately thin plate-shaped body, a second lifting section body E12 which is located below the first lifting section body E11, and a connecting device E13 which connects the first lifting section body E11 and the second lifting section body E12.

[0065] The first lifting part body E11 is provided with a locking hole h to which a lifting machine is locked.

[0066] The second lifting unit body E12 is provided with connection holes to which the main connection rope E2 and the sub connection rope E3 are attached. In addition, the second lifting section main body E12 is composed of a main section E12a to which a connecting device E13 is attached and which has a connecting hole in the front-to-back direction, and an auxiliary section E12b which is provided on the front end surface of the main section E12a and which has a connecting hole in the left-to-right direction.

[0067] The connector E13 is configured as a so-called swivel that connects the first lifting part body E11 and the second lifting part body E12 so as to be relatively rotatable about an axis in the vertical direction.

[0068] In this embodiment, there are four main connecting ropes E2, each consisting 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. In addition, the two main connecting ropes E2 connect the lifting part main body E1 and the support part D by attaching each connecting ring E22 to the connecting hole of the lifting bracket w provided on each lifting bracket holding part D5 and to the connecting hole at the rear of the main part E12a. Furthermore, the remaining two main connecting ropes E2 connect the lifting part main body E1 and the support part D by attaching each connecting ring E22 to the connecting hole of the lifting bracket w provided on the first base part D11 and each connecting hole of the auxiliary part E12b.

[0069] In this embodiment, one sub-connecting rope E3 is provided, and is composed of a wire rope-like sub-connecting rope main body E31 and a pair of connecting rings E32 to which both ends of the sub-connecting rope main body E31 are fastened. In addition, the secondary connecting rope E3 connects the lifting unit main body E1 and the reciprocating unit main body C11 by attaching each connecting ring E32 to the connecting hole of the lifting bracket w provided on the second reciprocating unit main body C11b and to the connecting hole in front of the main part E12a.

[0070] The fixing means F has a pair of side walls F1 extending vertically downward from the bottom surface of the base D1, and a pressing means P interposed between the side walls F1. A more specific configuration of the pressing means P will be described later with reference to FIG.

[0071] Each side wall F1 is made up of a side wall main body F11 formed as a substantially thin plate-like body, and a tapered portion F12 connected to the lower end of the side wall main body F11.

[0072] The side wall main bodies F11 are provided at predetermined intervals in the left-right direction so that the surface direction of each side wall main body F11 is substantially parallel to the front-rear direction.

[0073] Each of the tapered portions F12 is inclined inward, so that the pair of tapered portions F12 as a whole presents a tapered shape that becomes sharper toward the lower end. With this configuration, the worker can smoothly insert the fixing means F into the rack cell r.

[0074] The configuration and operation of the hammer part A will be described in detail below with reference to FIG. Each upper view in Figure 3 is a partially enlarged view of Figure 2(B), in which each insertion portion body B1 and each first reciprocating portion body C11a are shown in a transparent state by being drawn with dotted lines, and the cover member k is excluded. In addition, in each of the upper views of FIG. 3, the main connecting rope E2, the sub connecting rope E3, and the lifting bracket w to which they are connected are omitted. 3A and 3B are enlarged views of the hammer part A and the connecting part C12 in the upper views.

[0075] As shown in Figure 3, each hammer part A has a hammer part main body A1 connected to the insertion part main body B1, a contact part A2 provided on the hammer part main body A1 and capable of contacting the inner wall of the rack cell r, and a biasing part A3 that biases the contact part A2 toward the inner wall of the rack cell r. For the sake of convenience, the following description will be made of the configuration of the uppermost hammer portion A, but the other hammer portions A have the same configuration except that they are not provided with a compression spring portion A4, which will be described later.

[0076] The hammer body A1 is rotatably supported by a pivot support B2. 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 pivot support portion B2 passes. The loose-fitting hole A11 is configured to have a substantially elliptical shape in a side view, so that the connecting portion C12, which is configured to have a substantially cylindrical shape, is inserted into the loose-fitting hole A11 with some play.

[0077] The contact portion A2 extends forward from below the hammer body A1. The hammer portion A is configured as a substantially plate-like body having substantially the same thickness as a whole, including the hammer portion main body A1 and the contact portion A2.

[0078] The biasing portion A3 is provided at the rear of the hammer portion main body A1 and is a leaf spring curved in an approximately L-shape toward the rear. It biases the abutment portion A2 by abutting against the inner wall opposite the inner wall that the abutment portion A2 abuts against.

[0079] The compression spring portion A4 is provided only on the uppermost hammer portion A, and is provided above the hammer portion body A1 so as to protrude forward in the same manner as the abutment portion A2. Similarly to the contact portion A2, the compression spring portion A4 is configured to be able to contact the inner wall of the rack cell r.

[0080] The hammer section A configured as described above is operated by the control mechanism C as follows. That is, when the piston rod C21 moves downward from the state shown in Figure 3(A), the second reciprocating part body C11b connected to the piston rod C21 moves downward, and the first reciprocating part body C11a connected to the second reciprocating part body C11b moves downward. As a result, the first reciprocating portion body C11a presses the hammer portion body A1 downward via the connecting portion C12. As a result, the hammer body A1 rotates clockwise as viewed from the right side (a driving force toward the inner wall is applied) around the pivot support B2, resulting in the state shown in FIG. 3(B).

[0081] Furthermore, 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 pulls the hammer part body A1 upward via the connecting part C12. As a result, the hammer body A1 rotates counterclockwise as viewed from the right side about the pivot support B2, and assumes the state shown in FIG. 3(A). In the following description, the state of the hammer part A shown in FIG. 3(A), that is, 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 the initial state.

[0082] In this way, the vibration imparting part C2 (piston rod C21) imparts a reciprocating vibration motion in the up and down direction to the reciprocating part main body C11, and this reciprocating vibration motion is converted into a rotational vibration motion of the hammer part main body A1 by the support part B2 and the connecting part C12.

[0083] In FIG. 3 (and FIG. 11), for the sake of convenience, the travel distance of the reciprocating vibration motion and the rotation angle of the associated rotational vibration motion are exaggerated, but in reality, the travel distance and rotation angle are much smaller.

[0084] 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 9 Hz to 10 Hz, causing the hammer body A1 to perform high-speed rotational vibration at a small angle of about 5°. Furthermore, the operator can change the vibration frequency and amplitude of the piston rod C21 to any desired values ​​via a control panel, which will be described later.

[0085] The configuration and operation of the pressing means P will be described in detail below with reference to FIG. 4 is a partially enlarged view of FIG. 2(B), and shows the side wall portions F1 in a transparent state by drawing them with dotted lines.

[0086] The pressing means P has a cylinder P1, a lever portion P2, and a conversion mechanism P3 that connects the cylinder P1 and the lever portion P2.

[0087] 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 along the vertical direction. More specifically, the cylinder P1 includes a piston rod P11, a cylinder mechanism P12 including a cylinder tube t1 that houses the piston rod P11, front and rear covers t2, etc., and a connecting pipe P13. The cylinder P1 may be an air cylinder or an electric cylinder.

[0088] A guide rail P31, which will be described later, is provided at the tip of the piston rod P11.

[0089] The cylinder mechanism P12 is connected to the bottom surface of the base portion D1 so as to extend vertically downward.

[0090] The connection pipes P13 are provided inside the front and rear covers t2 and the above-mentioned standing portion D2. In addition, a hydraulic hose (not shown) that connects the cylinder mechanism P12 and a hydraulic pump (not shown) installed separately outside is connected to one end of a connecting pipe P13 provided inside the standing portion D2 via a coupler.

[0091] Furthermore, the connecting pipe P13 provided on the front and rear covers t2 and the connecting pipe P13 provided inside the standing portion D2 are also connected by hydraulic hoses via couplers. The hydraulic hoses are, for example, inserted into through holes (not shown) provided in the base portion D1 or the standing portion D2, and are drawn out to the ends of the respective connection pipes P13. As a result, hydraulic oil supplied from the hydraulic pump passes through each hydraulic hose and is supplied to the cylinder mechanism P12, thereby enabling the piston rod P11 to move up and down.

[0092] The lever portion P2 is composed of a lever portion main body P21, which is a plate-like body that is roughly V-shaped in side view, and a rotation shaft P22 that is suspended between each side wall portion F1 and rotatably supports the lever portion main body P21.

[0093] The lever body P21 is pivotally supported by a rotation shaft P22 extending in the left-right direction, and is configured to be rotatable in the same direction as the hammer A.

[0094] The conversion mechanism P3 is composed of a guide rail P31 that is provided at the tip of the piston rod P11 and moves back and forth together with the piston rod P11, and a cam follower P32 that is provided at the top of the lever portion main body P21 and is fitted so as to be slidable in the forward and backward directions along the guide rail P31.

[0095] The pressing means P configured as above is operated by a hydraulic pump as follows. That is, when the guide rail P31 moves downward together with the piston rod P11 from the state shown in FIG. 4(A), the cam follower P32 slides forward, and the lever portion main body P21 rotates counterclockwise in right side view about the rotation axis P22. As a result, the lower portion of the lever portion main body P21 protrudes from each side wall portion F1 in a side view, resulting in the state shown in FIG. 4(B).

[0096] Furthermore, when the guide rail P31 moves upward together with the piston rod P11 from the state shown in FIG. 4(B), the cam follower P32 slides rearward, and the lever portion main body P21 rotates clockwise in right side view about the rotation axis P22. As a result, the lower part of the lever portion main body P21 is stored between the side wall portions F1 in a side view, as shown in FIG. 4(A).

[0097] In this way, the reciprocating sliding motion of the cylinder P1 (piston rod P11) is converted into the rotational motion of the lever portion main body P21 by the conversion mechanism P3.

[0098] Hereinafter, a method of using the crushing device X will be described with reference to FIGS. In the enlarged views shown in Figures 5 and 6, and in Figures 9 and onwards, as in Figure 3, each insertion portion body B1 and each first reciprocating portion body C11a are shown in a transparent state, and the cover member k is excluded. 5 and 6, the main connecting rope E2, the lifting bracket w connected thereto, and the fixing means F are omitted. 7. 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 section along the line PP' shown in FIG.

[0099] Here, the operator can remotely control the operation of the vibration imparting section C2 using the air pump and the operation of the cylinder P1 using the hydraulic pump via an externally installed control panel (not shown), an electromagnetic valve (not shown), etc. The worker can also view the image captured by the camera unit B3, for example, on a display monitor (not shown) provided near the control panel.

[0100] First, from the state shown in FIG. 5, the worker engages a lifting machine such as a crane truck with the engaging hole h of the first lifting portion main body E11, and lifts up the crushing device X. When not in use, the crushing device X is supported in an upright position on a dedicated frame Z consisting of multiple pillars and beams, as shown in Figure 5, and the first lifting part body E11 is inserted into each slit and placed on each placement part D3.

[0101] Here, the crushing device X is lifted by a lifting machine, and changes from the state shown in FIG. 5 to the state shown in FIG.

[0102] In more detail, when the crushing device X is supported by the frame Z, each hammer section A is rotated slightly clockwise from its initial state as the reciprocating section body C11 moves downward due to its own weight.

[0103] When the crushing device X is lifted by a lifting machine, a predetermined tension is generated in the sub-connecting rope E3, and the reciprocating unit main body C11 moves upward due to this tension. As a result, each hammer body A1 rotates around each pivot support B2 via each connecting portion C12 in a direction (counterclockwise in this embodiment) in which each abutment portion A2 moves away from the inner wall of the rack cell r that is the target of collision, returning to its initial state.

[0104] In this embodiment, when each hammer portion A is in its initial state, the distance from the front end face of each hammer portion A (each abutment portion A2) to the rear end (top) of each urging portion A3 is configured to be approximately the same as the width of the rack cell r along the front-to-rear direction. By configuring it in this manner, the worker can smoothly insert the insertion portion B etc. into the rack cell r1, and can quickly bring each abutment portion A2 into a state of abutment against the inner wall of the rack cell r.

[0105] Next, the worker carries the crushing device X to the fuel storage rack R using a lifting machine, as shown in FIG.

[0106] For ease of explanation, the rack cell r into which the hammer portion A, the insertion portion main body B1, and the reciprocating portion C1 are inserted will be referred to as rack cell r1, and the rack cell r into which the fixing means F is inserted will be referred to as rack cell r2. The rack cell r1 and the rack cell r2 are adjacent rack cells r in the front-to-rear direction. In addition, a channel box fb (spent fuel, see Figure 8, etc.) is inserted into the rack cell r adjacent to the front of the rack cell r1, and is lifted up using a dedicated lifting device (not shown), although this is not shown in Figure 7.

[0107] Next, the worker places the crushing device X on the fuel storage rack R using a lifting machine, as shown in FIG. 8(A). In detail, the worker inserts the hammer portion A, the insertion portion main body B1 and the reciprocating portion C1 (first reciprocating portion main body C11a, connecting portion C12) into the rack cell r1, inserts the fixing means F into the rack cell r2, and seats the base portion D1 on the fuel storage rack R.

[0108] Next, as shown in FIG. 8(B), the worker uses a lifting machine to insert the first lifting part body E11 into each slit, thereby placing it on each placement part D3. At this time, each of the contact portions A2 and each of the biasing portions A3 comes into contact with the inner walls of the rack cell r1 that face each other in the front-rear direction, and each of the hammer portions A is set in its initial state.

[0109] Next, as shown in FIG. 9(A), the worker operates the hydraulic pump to move the piston rod P11 downward, thereby causing the conversion mechanism P3 to project the lever portion main body P21 from each side wall portion F1. As a result, the lever portion main body P21 presses against the inner wall of the rack cell r2, and the resulting reaction force is transmitted to the entire crushing device X, causing each abutment portion A2 to be pressed against the inner wall of the rack cell r1.

[0110] Furthermore, the worker confirms through the image captured by the camera unit B3 that the compression spring unit A4 of the uppermost hammer unit A is contracted, as shown in FIG. 9(B). In other words, when the compression spring portion A4 is contracted, it indicates that the compression spring portion A4 is in contact with the inner wall of the rack cell r1, and from this, the operator can confirm that the contact portion A2 is definitely in contact with the inner wall of the rack cell r1. In this way, since the compression spring part A4 is provided above the contact part A2 in the uppermost hammer part A, it becomes easy to check the contact state of the contact part A2 via the camera part B3 even when it is difficult to see the contact part A2, for example, in murky water.

[0111] 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 the upper end of the channel box fb. The channel fastener cf is a device that not only connects the channel box fb and the fuel assembly with its screw threads, but also has a pair of leaf springs on two sides whose purpose is to maintain the spacing between the fuel assemblies inside the reactor.

[0112] Also, as shown in Figure 10, the rack guide portion Lg, which is usually provided at the upper end of the partition wall p that separates multiple rack cells r, is formed with a slope that narrows as it approaches its upper and lower ends, taking into consideration the convenience of inserting the channel box fb (spent fuel). Furthermore, the rack guide portion Lg at the top of the fuel storage rack R (partition p) is narrower than the inner diameter of the rack cell r, and during normal fuel removal, the leaf spring of the channel fastener cf comes into contact with and is pushed against the rack guide portion Lg, bending inward as the fuel is removed.

[0113] Due to the configuration of the channel fastener cf and the partition wall p described above, for example, if an obstacle ob is sandwiched between the channel box fb and the channel fastener cf as shown in Figure 10, when an attempt is made to remove the channel box fb (spent fuel), even if the leaf spring of the channel fastener cf comes into contact with the rack guide portion Lg, the presence of the obstacle ob prevents the leaf spring from being pushed down. This prevents the channel box fb (spent fuel) from passing through the rack guide portion Lg, which hinders the operation of removing the channel box fb (spent fuel).

[0114] Therefore, after the worker sets the crushing device X to the state shown in FIG. 9, he or she performs a striking operation to strike the inner wall of the rack cell r1 with the contact portion A2.

[0115] More specifically, the worker operates the air pump to reciprocate the vibration applying part C2 (piston rod C21), thereby causing the hammer part A to rotate and vibrate. That is, when the piston rod C21 moves upward, the hammer part A rotates counterclockwise against the biasing force of the biasing part A3 (FIG. 11(A)). As the piston rod C21 moves downward, the hammer A receives the biasing force of the biasing portion A3 and is given a propulsive force toward the inner wall, causing it to rotate clockwise and strike the front inner wall of the rack cell r1 (FIG. 11(B)).

[0116] At this time, the piston rod C21 repeats minute vibrations with amplitude and frequency similar to those described with reference to FIG. 3, causing the hammer body A1 to repeat the above-mentioned minute clockwise and counterclockwise rotations. As a result, the contact portion A2 repeatedly strikes the front inner wall of the rack cell r1, and the striking force of the contact portion A2 is transmitted to the obstacle ob via the front inner wall, thereby crushing the obstacle ob.

[0117] For the sake of convenience, only the striking action of the uppermost hammer part A has been described in detail above, but the other hammer parts A will also perform striking actions similar to those described above simultaneously with the uppermost hammer part A. 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 Figure 11(B), the abutment part A2 extends from the hammer part main body A1 in a substantially horizontal direction and strikes the inner wall, but it may be configured so that it strikes the inner wall at a certain angle (i.e., extending slightly upward or downward).

[0118] The striking action of each hammer part A described above crushes multiple obstacles ob caught between the channel box fb and the partition wall p (or the channel box fb and the channel fastener cf), allowing the worker to smoothly remove the spent fuel.

[0119] Furthermore, if an obstacle ob has also entered between the channel box fb and another partition wall p, the worker will use the hydraulic pump to release the pressing state of the pressing means P, and then lift the crushing work 1 using a lifting machine. Then, the worker inserts the insertion portion B etc. into another rack cell r formed by another partition wall p, and performs the same striking operation as above.

[0120] According to this embodiment, the worker can crush the obstacle ob by using the control mechanism C to perform the required number of striking operations with the hammer section A, thereby enabling the work of removing spent fuel to be carried out smoothly.

[0121] In addition, the control mechanism C rotates the hammer body A1 around the support portion B2 and causes the contact portion A2 to collide with the inner wall of the rack cell r1, allowing the worker to more efficiently apply the impact force associated with the collision of the contact portion A2 using the centrifugal force of the hammer body A1.

[0122] Furthermore, the operation of the vibration applying part C2 and the reciprocating part C1 allows the worker to easily and continuously perform impact operations using the contact part A2, improving the workability of crushing the obstacles ob.

[0123] In addition, the multiple (four) hammer sections A arranged along an approximately vertical direction allow the worker to simultaneously apply striking force to multiple obstacles ob that have gotten stuck between the channel box fb and the rack cell r, further improving the workability of crushing the obstacles ob.

[0124] Furthermore, the lifting part E allows the worker to easily transport the crushing device X to the fuel storage rack R and remove it.

[0125] In addition, the sub-connecting rope E3, which generates a predetermined tension when the crushing device X is lifted, allows the hammer section main body A1 to rotate clockwise while the crushing device X is lifted, allowing the worker to smoothly insert the insertion section B etc. into the rack cell r1.

[0126] In addition, by using the mounting section D3, the worker can place the lifting section main body E1 on the mounting section D3 when the pulverizer X is seated on the fuel storage rack R or when not in use, thereby making the pulverizer X more easily stored and improving the workability of other tasks performed around the pulverizer X.

[0127] Furthermore, since the vibration imparting part C2 is an air cylinder, the operator can preset the amplitude and frequency of the vibration imparting part C2, thereby making it possible to adjust the rotation angle of the hammer part main body A1 and the impact force of the abutment part A2.

[0128] Furthermore, the biasing portion A3 allows the operator to absorb the reaction force received when the contact portion A2 collides with the inner wall, and allows the operator to always perform a stable striking operation.

[0129] Furthermore, the pressing means P allows the worker to more reliably apply impact force to the rubble by the contact portion A2, and also makes it possible to suppress fluctuations in the position of the entire crushing device X due to repeated impact operations.

[0130] Furthermore, the camera unit B3 allows the worker to visually check whether the contact part A2 is in proper contact with the inner wall of the target and whether the striking operation can be performed properly.

[0131] The shapes and dimensions of the components shown in the above-described embodiment are merely examples and can be modified in various ways based on design requirements, etc.

[0132] For example, in this embodiment, the number of hammer portions A is four, but it may be three or less, or five or more, and accordingly, the lengths of the insertion portion main body B1 and the first reciprocating portion main body C11a, and the number of axial support portions B2 and connecting portions C12 will also be changed. [Explanation of symbols]

[0133] X Crushing Device A Hammer section B Insertion part C Control Mechanism D Support part E Lifting section F Fixing means R Fuel storage rack r rack cell fb channel box (spent fuel) cf channel fastener Obstacles

Claims

1. When removing a channel box from a fuel storage rack consisting of multiple rack cells A crushing device for crushing an object that obstructs the a hammer portion inserted into the one rack cell; and a control mechanism for controlling the operation of the hammer portion; a support portion that supports the control mechanism and a support portion that supports the control mechanism, The hammer portion includes a hammer portion body connected to the insertion portion, and a hammer portion body. and a contact portion that can contact the inner wall of the one rack cell, The control mechanism applies a propulsive force to the hammer body toward the inner wall, thereby The crushing device crushes the object by causing the contact portion to collide with the inner wall of one of the rack cells.

2. The insertion portion has a pivot portion that rotatably supports the hammer body, The crushing device according to claim 1 , wherein the control mechanism rotates the hammer body around the pivot support to cause the contact portion to collide with the inner wall of the one rack cell.

3. The support portion extends in a substantially horizontal direction, the control mechanism includes a reciprocating unit that is inserted into the one rack cell together with the hammer unit and the insertion unit, and a vibration applying unit that moves the reciprocating unit up and down in a substantially vertical direction, the reciprocating unit includes a reciprocating unit body connected to the vibration applying unit, and a connecting unit connecting the reciprocating unit body and the hammer unit body, The crushing device according to claim 2 , wherein the hammer body rotates around the pivot support by vertical movement of the connecting portion via the vibration applying portion.

4. the insertion portion and the reciprocating portion are elongated bodies extending substantially vertically, The insertion portion is provided with a plurality of the pivot support portions along a substantially vertical direction, The reciprocating portion is provided with a plurality of connecting portions along a substantially vertical direction, The hammer body is provided in a plurality of positions along a substantially vertical direction, 4. The crushing device according to claim 3, wherein each of the plurality of hammer bodies is connected to the insertion portion via one of the pivot support portions and to the reciprocating portion via one of the connecting portions.

5. a lifting section that lifts the insertion section and the control mechanism via the support section, 5. The crushing device according to claim 3, wherein the lifting section has a lifting section body to which a predetermined lifting machine is attached, and a main connecting rope connecting the lifting section body and the support section.

6. The lifting unit has a sub-connecting rope connecting the lifting unit main body and the reciprocating unit main body, a predetermined tension is generated in the auxiliary connecting rope when the insertion portion and the control mechanism are lifted, The reciprocating unit body is configured to be movable upward by the tension, The crushing device according to claim 5, wherein the hammer body rotates in a direction in which the contact portion moves away from the inner wall of the one rack cell that is the target of collision due to movement of the reciprocating body based on the tension.

7. The crushing device according to claim 5 or 6, wherein the support portion has a mounting portion on which the lifting portion body is mounted.

8. 8. The crushing device according to claim 3, wherein the vibration applying unit is a cylinder including a piston rod that electrically moves up and down in a substantially vertical direction.

9. 9. The crushing device according to claim 1, wherein the hammer portion has a biasing portion that biases the contact portion toward the inner wall of the one rack cell.

10. a fixing means connected to the support portion and inserted into another rack cell different from the one rack cell into which the hammer portion is inserted, The crushing device according to any one of claims 1 to 9, wherein the fixing means has a pressing means that presses the inner wall of the other rack cell, thereby pressing the abutment portion against the inner wall of the one rack cell via the support portion and the insertion portion.

11. The crushing device according to any one of claims 1 to 10, wherein the insertion portion has a camera portion provided above it that can photograph the contact portion inserted into the one rack cell.

Images