JP2007003203A - Nuclear fuel assembly handling tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple nuclear fuel assembly handling tool allowing a person to surely and easily check the seating of the tool on a nuclear fuel assembly and the nuclear fuel assembly gripping condition of the tool. <P>SOLUTION: The nuclear fuel assembly handling tool for a boiling water reactor comprises: a nuclear fuel assembly supporting means provided vertically; a gripping means installed on the bottom end of the supporting means or in the vicinity of the bottom end for gripping the nuclear fuel assembly by an air-driven device; and a seating condition display means or a gripping condition display means for the nuclear fuel assembly installed on the top end of the supporting means or in the vicinity of the top end. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a nuclear fuel assembly handling tool used for moving a nuclear fuel assembly for a boiling water reactor.

  In general, a so-called nuclear fuel exchanger is used as a nuclear fuel assembly handling tool used in moving a nuclear fuel assembly used in a boiling water nuclear power plant, and is provided at the lower end of the mast of the nuclear fuel exchanger. The nuclear fuel assembly is gripped and lifted by the grapple, and then moved to a predetermined location. However, the nuclear fuel changer is large, cumbersome and expensive.

  For this reason, in particular, a simple nuclear fuel assembly handling tool is used for storing and taking out a nuclear fuel assembly from a cask (nuclear fuel transport container) or the like from the viewpoint of easy operation and agility. As this type of nuclear fuel assembly handling tool, there is an atomic fuel assembly handling tool that suspends an air-driven grapple such as an air cylinder with a wire and grips the nuclear fuel assembly with the grapple.

  In the case of the simple nuclear fuel assembly handling tool described above, it is confirmed whether the nuclear fuel assembly handling tool is seated on the nuclear fuel assembly (seating confirmation), or the nuclear fuel assembly handling tool is used for the nuclear fuel. Confirmation (gripping confirmation) of whether or not the assembly has been gripped is difficult for the following reasons.

  A nuclear fuel assembly containing nuclear fuel is usually stored in water. This is because radiation such as γ rays and neutron rays emitted from nuclear fuel, particularly spent nuclear fuel, is shielded by attenuation or scattering by water, thereby reducing the exposure of workers.

  On the other hand, in the case of the simple nuclear fuel assembly handling tool described above, the display for confirmation of seating and gripping is attached to the grapple. It was necessary to confirm the display of the grapple in the water of about 8 m with binoculars or other methods.

  For this reason, the problem to be solved by the present invention is a simple nuclear fuel assembly handling tool, which can surely and easily confirm seating and gripping on the nuclear fuel assembly. Is to provide.

  As a result of intensive studies, the present inventor can achieve the above-mentioned problem by providing a seating state display means or a gripping state display means for the nuclear fuel assembly at or near the upper end of the nuclear fuel handling tool. The present invention has been completed.

That is, the present invention provides the following claims.
A nuclear fuel assembly handling tool for a boiling water reactor,
The means for supporting the nuclear fuel assembly is suspended,
A gripping means for gripping the nuclear fuel assembly by an air driving device is provided at or near the lower end of the support means,
Provided is a nuclear fuel assembly handling tool characterized in that a seating state display means or a gripping state display means of the nuclear fuel assembly is provided at or near the upper end of the support means.

  In the present invention, the seating state display means or the gripping state display means for the nuclear fuel assembly is provided at or near the upper end of the support means, so that seating confirmation or gripping confirmation can be performed in the air instead of underwater. Can be confirmed easily.

Next, the present invention provides a second aspect of the present invention.
2. The nuclear fuel assembly handling tool according to claim 1, wherein both the seating state display unit and the gripping state display unit are provided on the support unit. 3.

  According to the present invention, it is possible to easily confirm both seating and gripping.

Next, the present invention provides a third aspect of the present invention.
The support means comprises
A support pipe;
3. The atom according to claim 1, further comprising: a grapple provided in communication with the lower end of the support pipe and provided with a gripping means for gripping the nuclear fuel assembly. 4. Provide fuel assembly handling tools.

  According to the present invention, the above-described problem can be achieved by a nuclear fuel assembly handling tool having a support pipe and a grapple as basic components.

Next, the present invention provides a fourth aspect of the present invention.
The gripping means includes a gripping part, and the gripping part grips the nuclear fuel assembly by elasticity of an elastic body provided in the gripping part. A nuclear fuel assembly handling tool according to any one of 3 is provided.

  According to the present invention, even if a trouble such as stopping the supply of air to the air driving device occurs, the nuclear fuel assembly can always be securely gripped regardless of the trouble. In the present invention, the elastic force is applied to the member connected to the gripping portion and the elastic force is indirectly applied to the gripping portion in addition to the case where the elastic body is provided directly on the gripping portion. This includes cases where a body is provided.

Next, the present invention provides a fifth aspect of the present invention.
2. The gripping unit is provided with an air driving device connected thereto, and when the air driving device is supplied with air, the gripping of the nuclear fuel assembly by the gripping unit is released. A nuclear fuel assembly handling tool according to any one of claims 4 to 4 is provided.

  According to the present invention, it is possible to release the grip of the nuclear fuel assembly only by a simple process of air supply, and a safe design that does not cause a risk of release of the grip even if a trouble of stopping the air supply occurs. It has become.

Next, the present invention provides, as claim 6,
6. The nuclear fuel assembly handling tool according to claim 5, wherein an air supply pipe and an air exhaust pipe for the air driving device are vertically suspended in the support means. .

Next, the present invention provides the following as claim 7.
The nuclear fuel assembly handling tool according to claim 6, wherein the air supply pipe and the air exhaust pipe are connected to the air driving device by a flexible pipe.

Next, the present invention provides the following as claim 8.
The seating state display means or the gripping state display means is a display means based on a combination of an air pipe position display provided above the air supply pipe or the air exhaust pipe and a support means position display provided on the support pipe. The nuclear fuel assembly handling tool according to claim 6 or 7, wherein the nuclear fuel assembly handling tool is provided.

  According to the above invention, the air supply pipe and the air exhaust pipe can be used not only for air supply / discharge but also as a means for displaying a seating state and a gripping state, and providing a support means position indication on the support pipe. This makes it easy to check each state, making it possible to reduce the size and cost of the tool.

Next, the present invention provides, as claim 9,
A seating confirmation tool is fixed to the lower part of the air supply pipe or the air exhaust pipe,
When the nuclear fuel assembly handling tool is lowered, the handle provided at the upper end of the nuclear fuel assembly is penetrated from the through hole provided in the lower surface of the grapple, so that the handle is attached to the seating confirmation tool. Raise the seating confirmation tool while abutting,
The nuclear fuel assembly handling tool according to any one of claims 6 to 8, wherein the air supply pipe or the air exhaust pipe rises by raising the seating confirmation tool.

  In the present invention, since the descent state of the nuclear fuel assembly handling tool is linked to the raising and lowering of the air pipe (air supply pipe or air exhaust pipe), the air pipe position indication provided on the air pipe and the support pipe The seating confirmation of the nuclear fuel assembly handling tool on the nuclear fuel assembly can be confirmed in the upper portion of the air pipe, that is, in the air.

Next, the present invention provides, as claim 10,
The nuclear fuel assembly handling tool according to claim 9, wherein the gripping operation of the gripping means is prohibited by the lowering of the seating confirmation tool.

Next, the present invention provides, as claim 11,
11. The nuclear fuel assembly handling tool according to claim 9, wherein the prohibition of the gripping operation of the gripping means is released by raising the seating confirmation tool.

  According to the above invention, when the nuclear fuel assembly handling tool is not seated on the nuclear fuel assembly, the supporting means performs a gripping operation, and the nuclear fuel assembly handling tool is lifted up by misunderstanding that it has been gripped. Can be prevented. The seating confirmation tool can also be used as a means for inhibiting the gripping operation, and the tool can be reduced in size and cost.

Next, the present invention provides, as claim 12,
The air supply pipe or the air exhaust pipe is connected to the gripping means by a link mechanism;
When the nuclear fuel assembly is gripped by the gripping means, the air supply pipe or the air exhaust pipe is below or above,
When the holding of the nuclear fuel assembly is released by the holding means, the air supply pipe or the air exhaust pipe is upward or downward,
The nuclear fuel assembly handling tool according to any one of claims 6 to 11, which is moved up and down.

In the present invention, since the gripping state of the nuclear fuel assembly handling tool is linked to the raising and lowering of the air pipe (air supply pipe or air exhaust pipe), the air pipe position indication provided on the air pipe and the support pipe By the support means position display provided in the above, the grasping of the nuclear fuel assembly by the nuclear fuel assembly handling tool can be confirmed at the upper part of the air tube, that is, in the air.
Furthermore, when an air supply stop trouble occurs when removing the nuclear fuel assembly from the nuclear fuel assembly handling tool, the grip release operation can be manually performed by manually lowering the air tube.

Next, the present invention provides, as claim 13,
The position of the seating confirmation tool when the nuclear fuel assembly handling tool is seated on the nuclear fuel assembly,
The nuclear fuel assembly according to any one of claims 9 to 12, wherein the nuclear fuel assembly is located above a position of the seating confirmation tool when the nuclear fuel assembly is lifted by the nuclear fuel assembly handling tool. Provide body handling tools.

  According to the present invention, when the nuclear fuel assembly is gripped and lifted by the nuclear fuel assembly handling tool, the seating confirmation tool descends relative to the support means. The release of the grip is prohibited, and the nuclear fuel assembly can be lifted and moved safely.

In the present invention, even with a simple nuclear fuel assembly handling tool, seating confirmation or gripping confirmation can be performed not in water but in the air, so that confirmation can be easily performed. For this reason, erroneous operation can be prevented.
In addition, even if a trouble such as an air supply stop to the air drive device occurs due to an accident or the like, it is possible to always securely hold the nuclear fuel assembly regardless of such trouble.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

  FIG. 1 is an operation explanatory view of a nuclear fuel assembly handling tool 1 according to an embodiment of the present invention.

  The support pipe 101 is provided with a grapple 102 at the lower end and a hanger 103 made of a U-bolt at the upper end. In the support pipe 101, an air supply pipe 104 (air supply pipe) and an air exhaust pipe 105 (air exhaust pipe) are vertically suspended and reach the grapple 102, respectively.

  A seating confirmation tool 106 is fixed to the lower end of the air supply pipe 104, and the air supply pipe 104 is connected to one port (lower port) of the air cylinder 108 by a flexible air hose 107 from the vicinity of the lower end. Has been.

  The upper end of the air supply pipe 104 is located in the vicinity of the hanger 103, and a scale 109 (air tube position display) is provided on the outer surface near the upper end of the air supply pipe 104. An instruction line 110 (support means position display) for indicating the scale 109 is provided in the portion of the support pipe 101 at a position corresponding to the scale 109.

  An air pipe from an air supply device is connected to the upper end of the air supply pipe 104 (not shown).

  A link 111 is provided in the vicinity of the lower end of the air exhaust pipe 105, and the air exhaust pipe 105 and a claw 112 (gripping portion) provided on the grapple 102 are connected by a link mechanism.

  In addition, a flexible air hose 113 is connected to the other port (upper port) of the air cylinder 108 from the vicinity of the lower end of the air exhaust pipe 105.

  The upper end of the air exhaust pipe 105 is located in the vicinity of the hanger 103, and a scale 114 (air tube position display) is provided on the outer surface near the upper end of the air exhaust pipe 105. In the portion of the support pipe 101 at a position corresponding to the scale 114, an instruction line 115 (support means position display) for indicating the scale 114 is provided.

  A claw 112 provided in the grapple 102 is connected to a single-acting air cylinder 108, and a first groove 116 and a second groove 117 are provided on the upper surface of the claw 112.

  The air cylinder 108 is provided with a spring (not shown) inside, and when no air is supplied from the air supply pipe 104, the handle 118 at the upper end of the nuclear fuel assembly (not shown) is gripped. When the claw 112 moves to air and air is supplied from the air supply pipe 104, the claw 112 moves in a direction in which the grip 118 of the upper end of the nuclear fuel assembly is released.

  A through hole 119 through which the handle 118 provided at the upper end of the nuclear fuel assembly can be inserted is provided on the lower surface of the grapple 102, and a tapered portion is provided below the through hole 119 so that the handle 118 can easily enter. 120 is provided.

Next, the operation of this embodiment will be described.
FIG. 1A shows a normal state in which the nuclear fuel assembly handling tool 1 is suspended by a wire 103 (not shown) by a lifting tool 103 at the upper end.

  In the state of FIG. 1A, air is supplied to the air cylinder 108 through the air supply pipe 104, and the claw 112 is located on the air cylinder 108 side.

  The lower end of the seating confirmation tool 106 is inserted into the first groove 116 of the claw 112 due to the weight of the air supply pipe 104 and the seating confirmation tool 106, and movement of the claw 112 is restricted. As a result, even if the supply of air to the air cylinder 108 is stopped due to equipment failure or the like, the claw 112 is elastically moved by the spring inside the air cylinder 108 in the direction of moving the claw 112 in the direction of the through hole 119. However, the claw 112 does not move in the direction of the through hole 119.

  Next, when the nuclear fuel assembly handling tool 1 is lowered to the nuclear fuel assembly from the state of FIG. 1 (a), the handle 118 at the upper end of the nuclear fuel assembly passes through the through-hole 119, as described above. Since the claw 112 cannot move in the direction of the through hole 119, the nuclear fuel assembly handling tool 1 is seated on the nuclear fuel assembly and the handle 118 is confirmed to be seated as shown in FIG. While making contact with the tool 106, the seating confirmation tool 106 is raised relative to the nuclear fuel assembly handling tool 1.

  As a result, the air supply pipe 104 rises, and the seating of the nuclear fuel assembly can be confirmed by the scale 109 and the indicator line 110.

  Further, the lower end of the seating confirmation tool 106 fitted in the first groove 116 of the claw 112 is separated from the first groove 116, and the movement restriction of the claw 112 is released. In this state, the supply of air to the air cylinder 108 is stopped. As a result, the claw 112 moves in the direction of the through hole 119 by the elastic force of the spring provided in the air cylinder 108, and grips the handle 118 as shown in FIG.

  In the state of FIG. 1C, as the claw 112 moves in the direction of the through hole 119, the air exhaust pipe 105 is raised by the operation of the link 111, and the scale 114 and the indicator line 115 indicate that the nuclear fuel assembly is It can be confirmed that the handle 118 is gripped by the claw 112.

  Next, the nuclear fuel assembly handling tool 1 is lifted by winding the wire. As the nuclear fuel assembly handling tool 1 is lifted, the handle 118 at the upper end of the nuclear fuel assembly is lowered relative to the nuclear fuel assembly handling tool 1 until the handle 118 comes into contact with the upper surface of the claw 112.

  Thereby, the seating confirmation tool 106 descends and the air supply pipe 104 descends. Further, the lower end of the seating confirmation tool 106 is fitted into the second groove 117 of the claw 112, the movement of the claw 112 is restricted, and the holding of the nuclear fuel assembly is released while the nuclear fuel assembly handling tool 1 is lifted. Is prevented.

  Next, after the suspended nuclear fuel assembly handling tool 1 is moved to a predetermined position, the nuclear fuel assembly handling tool 1 is lowered by a wire, and the nuclear fuel assembly is installed at a predetermined position.

  When the nuclear fuel assembly is installed at a predetermined position, the handle 118 at the upper end of the nuclear fuel assembly raises the seating confirmation tool 106 while abutting against the seating confirmation tool 106, and as a result, the air supply pipe 104 is raised. Furthermore, the lower end of the seating confirmation tool 106 is also separated from the second groove 117 of the claw 112, and the restriction on the movement of the claw 112 is released.

  Next, air is supplied to the air cylinder 108 through the air supply pipe 104, and the claw 112 is separated from the through hole 119 by the operation of the air cylinder 108, and the gripping of the handle 118 at the upper end of the nuclear fuel assembly is released.

  In this case, even if a state in which air cannot be supplied to the air cylinder 108 occurs due to a failure of the device, the claw 112 is forcibly moved toward the air cylinder 108 by pushing down the air exhaust pipe 105. The grip of the handle 118 can be released.

  Next, the wire is wound up and the nuclear fuel assembly handling tool 1 is lifted to return to the normal state of FIG.

  In the above operation, the raising and lowering of the air supply pipe 104 is linked to the raising and lowering of the seating confirmation tool 106, and the raising and lowering of the air exhaust pipe 105 is linked to the movement of the claw 112. When the air supply pipe 104 or the air exhaust pipe 105 is raised or lowered when the operator sits on or holds the nuclear fuel assembly, the scales 109 and 114 provided in the air and the indicator line 110 are provided. , 115 can be confirmed surely in the air.

FIG. 2 is an operation explanatory view of the nuclear fuel assembly handling tool 2 according to another embodiment of the present invention.
The support pipe 201 is provided with a grapple 202 at the lower end and a hanger 203 made of a U-bolt at the upper end. In the support pipe 201, an air supply pipe 204 (air supply pipe) and an air exhaust pipe 205 (air exhaust pipe) are vertically suspended and reach the grapple 202. In the grapple 202 of FIG. 2, the air supply pipe 204 is provided on the back surface of the air exhaust pipe 205.

  A seating confirmation tool 206 is fixed to the lower end of the air supply pipe 204, and the air supply pipe 204 is connected to one port (lower port) of the air cylinder 208 by a flexible air hose 207 from the vicinity of the lower end. Has been.

  The upper end of the air supply pipe 204 is located in the vicinity of the hanger 203, and an indication line 209 (air tube position indication) is provided on the outer surface near the upper end of the air supply pipe 204. Further, a scale 210 (support means position display) fixed to the support pipe is provided at a position corresponding to the instruction line 209.

  An air pipe from an air supply device is connected to the upper end of the air supply pipe 204 (not shown).

  A link 211 is provided near the lower end of the air exhaust pipe 205, and the air exhaust pipe 205 and a claw 212 (gripping part) provided on the grapple 202 are connected by a link mechanism.

  In addition, the air exhaust pipe 205 is connected to another port (upper port) of the air cylinder 208 from the vicinity of the lower end of the air exhaust pipe 205 by a flexible air hose 213.

  The upper end of the air exhaust pipe 205 is located in the vicinity of the hanger 203, and an instruction line 214 (air tube position display) is provided on the outer surface near the upper end of the air exhaust pipe 205. A scale 215 (support means position display) fixed to the support pipe 201 is provided at a position corresponding to the instruction line 214.

  A claw 212 provided in the grapple 202 is connected to a single-acting air cylinder 208 via a link 211. Unlike the embodiment of FIG. 1, the claw 212 is formed in a U-shape, and is configured to rotate around one end A of the claw 212 as a fulcrum.

  A spring 216 is provided between the air cylinder 208 and the link 211. When no air is supplied from the air supply pipe 204, the handle 218 at the upper end of the nuclear fuel assembly (not shown) is gripped. When the claw 212 is rotated and air is supplied through the air supply pipe 204, the claw 212 is rotated in the direction in which the grip of the handle 218 at the upper end of the nuclear fuel assembly is released.

  A through hole 219 through which a handle 218 provided at the upper end of the nuclear fuel assembly can be inserted is provided on the lower surface of the grapple 202, and a tapered portion is provided below the through hole 219 so that the handle 218 can easily enter. 220 is provided.

Next, the operation of this embodiment will be described.
FIG. 2 (a) shows a normal state in which the nuclear fuel assembly handling tool 2 is suspended by a wire (not shown) by a lifting tool 203 at the upper end.

  In the state of FIG. 2A, air is supplied to the air cylinder 208 through the air supply pipe 204, and the claw 212 is located in a state where the grip of the handle 218 at the upper end of the fuel assembly is released. 2B is a view of the handle 218 at the upper end of the fuel assembly as viewed from the side.

  The seating confirmation tool 206 is positioned near the lower end of the grapple 202 due to the weight of the air supply pipe 204 and the seating confirmation tool 206. For this reason, one end B of the U-shaped claw 212 abuts against the side surface of the seating confirmation tool 206, and the claw 212 is restricted from rotating in the direction in which the handle 218 is gripped, that is, in the through-hole direction.

  As a result, even if the supply of air to the air cylinder 208 is stopped due to equipment failure or the like, the elastic force by the spring 216 acts on the claw 212 in the direction of moving the claw 212 in the direction of the through hole 219. The claw 212 does not rotate in the direction of the through hole 219.

  Next, when the nuclear fuel assembly handling tool 2 is lowered to the nuclear fuel assembly from the state of FIG. 2 (a), the handle 218 at the upper end of the nuclear fuel assembly passes through the through-hole 219, as described above. Since the claw 212 cannot rotate in the direction of the through hole 219, the nuclear fuel assembly handling tool 2 is seated on the nuclear fuel assembly and the handle 218 is seated as shown in FIG. The seating confirmation tool 206 is raised relative to the nuclear fuel assembly handling tool 2 while contacting the confirmation tool 206.

As a result, the air supply pipe 204 is raised, and the seating of the nuclear fuel assembly can be confirmed by the indication line 209 and the scale 210.
Further, when the seating confirmation tool 206 is raised, the rotation restriction of the claw 212 is released.

  In this state, the supply of air to the air cylinder 208 is stopped. As a result, the claw 212 moves in the direction of the through hole 219 by the elastic force of the spring 216, and grips the handle 218 as shown in FIG. 2C, 2D, and 2E are views in which the air exhaust pipe 205 in the grapple 202 is removed.

  In the state of FIG. 2C, the air exhaust pipe 205 is lowered by the operation of the link 211 as the claw 212 rotates in the direction of the through hole 219, and the nuclear fuel assembly is indicated by the indication line 214 and the scale 215. Can be confirmed to be gripped by the nail 212.

  Next, the nuclear fuel assembly handling tool 2 is lifted by winding the wire. As the nuclear fuel assembly handling tool 2 is lifted, the nuclear fuel assembly is handled until the handle 218 at the upper end of the nuclear fuel assembly contacts the U-shaped inner surface of the claw 212 as shown in FIG. It descends relative to the tool 2.

  Thereby, the seating confirmation tool 206 is lowered, and the air supply pipe 204 is lowered. Further, since the lower end of the seating confirmation tool 206 is in contact with the U-shaped inner surface, the rotation of the claw 212 is restricted, and the holding of the nuclear fuel assembly is released while the nuclear fuel assembly handling tool 2 is lifted. It is prevented.

  Next, after the suspended nuclear fuel assembly handling tool 2 is moved to a predetermined position, the nuclear fuel assembly handling tool 2 is lowered by a wire, and the nuclear fuel assembly is installed at a predetermined position.

  When the nuclear fuel assembly is installed at a predetermined position, as shown in the figure (e), the handle 218 at the upper end of the nuclear fuel assembly raises the seating confirmation tool 206 while abutting against the seating confirmation tool 206. As a result, the air supply pipe 204 is raised. And the restriction | limiting of nail | claw 212 rotation is cancelled | released when the seating confirmation tool 206 raises.

  Next, air is supplied to the air cylinder 208 through the air supply pipe 204, and the operation of the air cylinder 208 rotates the claw 212 in a direction away from the through hole 219 to release the grip of the handle 218 at the upper end of the nuclear fuel assembly. To do.

  In this case, even if a state in which air cannot be supplied to the air cylinder 208 occurs due to equipment failure or the like, the claw 212 is forcibly rotated by pulling up the air exhaust pipe 205, and the handle 218 is The grip can be released.

  Next, the wire is wound up and the nuclear fuel assembly handling tool 2 is lifted to return to the normal state of FIG.

  In the above operation, the raising / lowering of the air supply pipe 204 is linked to the raising / lowering of the seating confirmation tool 206, and the raising / lowering of the air exhaust pipe 205 is linked to the rotation of the claw 212. When the tool 2 is seated on the nuclear fuel assembly or gripped by the nuclear fuel assembly, when the air supply pipe 204 and the air exhaust pipe 205 are moved up and down, the operator can check the indication lines 209 and 214 provided in the air and the scale. By looking at 210 and 215, it can be confirmed surely in the air.

  In the embodiment of FIGS. 1 and 2, more efficient work is possible by detecting the positions of the air supply pipe and the air exhaust pipe with sensors and taking the interlock for air supply and stop. become.

It is operation | movement explanatory drawing of one Example of this invention. It is operation | movement explanatory drawing of the other Example of this invention.

Explanation of symbols

1, 2 Nuclear fuel assembly handling tool 101, 201 Support pipe 102, 202 Grapple 103, 203 Lifting tool 104, 204 Air supply pipe 105, 205 Air exhaust pipe 106, 206 Seating confirmation tool 107, 113, 207, 213 Air hose 108 , 208 Air cylinder 109, 114, 210, 215 Scale 110, 115, 209, 214 Indicator line 111, 211 Link 112, 212 Claw 116 First groove 117 Second groove 118, 218 Handle 119, 219 Through hole 120, 220 Taper Part 216 Spring

Claims (13)

A nuclear fuel assembly handling tool for a boiling water reactor,
The means for supporting the nuclear fuel assembly is suspended,
A gripping means for gripping the nuclear fuel assembly by an air driving device is provided at or near the lower end of the support means,
A nuclear fuel assembly handling tool, wherein a seating state display means or a gripping state display means of the nuclear fuel assembly is provided at or near the upper end of the support means.   The nuclear fuel assembly handling tool according to claim 1, wherein the support means is provided with both the seating state display means and the gripping state display means. The support means comprises
A support pipe;
3. The atom according to claim 1, further comprising: a grapple provided in communication with the lower end of the support pipe and provided with a gripping means for gripping the nuclear fuel assembly. 4. Fuel assembly handling tool.   The gripping means includes a gripping part, and the gripping part grips the nuclear fuel assembly by elasticity of an elastic body provided in the gripping part. 4. The nuclear fuel assembly handling tool according to any one of 3 above.   2. The gripping unit is provided with an air driving device connected thereto, and when the air driving device is supplied with air, the gripping of the nuclear fuel assembly by the gripping unit is released. The nuclear fuel assembly handling tool according to claim 4.   6. The nuclear fuel assembly handling tool according to claim 5, wherein an air supply pipe and an air exhaust pipe for the air driving device are vertically suspended in the support means.   The nuclear fuel assembly handling tool according to claim 6, wherein the air supply pipe and the air exhaust pipe are connected to the air driving device by a flexible pipe.   The seating state display means or the gripping state display means is a display means based on a combination of an air pipe position display provided above the air supply pipe or the air exhaust pipe and a support means position display provided on the support pipe. The nuclear fuel assembly handling tool according to claim 6 or 7, wherein A seating confirmation tool is fixed to the lower part of the air supply pipe or the air exhaust pipe,
When the nuclear fuel assembly handling tool is lowered, the handle provided at the upper end of the nuclear fuel assembly is penetrated from the through hole provided in the lower surface of the grapple, so that the handle is attached to the seating confirmation tool. Raise the seating confirmation tool while abutting,
The nuclear fuel assembly handling tool according to any one of claims 6 to 8, wherein the air supply pipe or the air exhaust pipe rises as the seating confirmation tool rises.   The nuclear fuel assembly handling tool according to claim 9, wherein the gripping operation of the gripping means is prohibited by the lowering of the seating confirmation tool.   The nuclear fuel assembly handling tool according to claim 9 or 10, wherein the prohibition of the gripping operation of the gripping means is released by the rising of the seating confirmation tool. The air supply pipe or the air exhaust pipe is connected to the gripping means by a link mechanism;
When the nuclear fuel assembly is gripped by the gripping means, the air supply pipe or the air exhaust pipe is below or above,
When the holding of the nuclear fuel assembly is released by the holding means, the air supply pipe or the air exhaust pipe is upward or downward,
The nuclear fuel assembly handling tool according to any one of claims 6 to 11, wherein the tool is moved up and down. The position of the seating confirmation tool when the nuclear fuel assembly handling tool is seated on the nuclear fuel assembly,
The nuclear fuel assembly according to any one of claims 9 to 12, wherein the nuclear fuel assembly is located above a position of the seating confirmation tool when the nuclear fuel assembly is lifted by the nuclear fuel assembly handling tool. Body handling tools

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