JPH01495A - Equipment for handling nuclear reactor core components - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a device that handles the components of a nuclear reactor core, and in particular, it relates to a device that handles the components of a nuclear reactor core, and in particular, it relates to a device that handles the components of a nuclear reactor core. This is related to the technology handled in .

[Conventional technology]

FIG. 6 shows a conventional example of the reactor structure of a fast breeder reactor. The structure of a fast breeder reactor similar to the structure shown in Figure 6 is described in Part 3 of "SUf" ERpHENIX NIEWS J, published in March 1987.
As shown in the figure. As shown in FIG. 6, the fast breeder reactor has a reactor vessel 1 and a roof deck 2 that covers the top of the reactor vessel 1.

The roof deck 2 is composed of a large rotation plug 3 and a small rotation plug 4 that can rotate independently of each other. In this sealed container, there is a reactor core 5, a primary system coolant sodium 6 for extracting the heat generated by the nuclear reaction in the reactor core 5, and a system for forcing the primary system coolant to circulate through the reactor core 5. It includes a circulation pump 7 and an intermediate heat exchanger 8 that exchanges heat between the primary coolant that has become high temperature by passing through the reactor core and the low temperature secondary coolant from the outside.

The large rotation plug 3 is installed to rotate with respect to the roof deck 2, and the small rotation plug 4 is installed so as to rotate with respect to the large rotation plug 3. Small rotation plug 4
A core upper mechanism 9 and a fuel exchanger 10 are installed in the reactor. Further, as shown in FIG. 7, the reactor core 5 includes core fuel assemblies 11. Blanket fuel assembly 12. Control rod assembly 13. Movable neutron shield 1
4 and a fixed neutron shield 15.

Furthermore, an in-core relay pot is installed on the side of the reactor core 5 to temporarily store the core components before taking them out of the reactor. (not shown) is carried out of the furnace. An example of such a fuel inlet/output machine is Nuclear Technology, No. 6
Volume 8 (February 1985), pages 160 to 170 (N
UCLEARTECIINOLOGY VoQ 68
(Feb, l 985) PP, 160-1
70).

Among the core components, the core fuel assembly 11. Blankerato fuel assembly 12. The control assembly 13. The movable neutron shield 14 is connected to the fuel exchanger 10. Although it is necessary to replace the old and new ones inside and outside the reactor using a fuel inlet/outer machine, as the name suggests, the fixed neutron shield 15 does not need to be taken out of the reactor during the life of the plant and remains installed inside the reactor. Among the fuel assemblies that are moved in and out of the reactor, core fuel assemblies 11. Blanket fuel assembly 12. The movable neutron shield 14 has a structure as shown in FIG. 8, and a gripper claw of a refueling machine engages in a handling head 16 at the upper end so that it can be handled by the refueling machine. On the other hand, the control rod assembly 13 is connected to the guide tube 1 as shown in FIG.
7 and a control rod 18, which controls the handling head 19 of the control 4IL8 when adjusting the core power.
The control rod can be moved up and down by gripping it with the gripper claws of the rod drive device. Also, when moving the control rod assembly 13 in and out of the reactor, as with other core components,
The upper end of the guide tube 17 can be grasped and handled using the claws of the gripper of the fuel exchanger.

A refueling machine is shown in FIG. As shown in the figure, the fuel exchanger 10 includes a fuel exchanger body 20 that is supported in a vertically movable manner by a chain 24 wound around a winch 23, and a guide sleeve 21. The fuel exchanger main body 20 is installed to grip the core components, and the guide sleeve 21 is installed in the main body 20 to prevent the gripper from swinging during an earthquake. The fuel exchanger main body 20 is driven up and down via a chain 24.

The fuel exchanger main body 20 has claws 2 for grasping core components.
5, a claw operating shaft 26 for opening and closing the claw 25,
Outer cylinder and claw operating shaft 2 that prevent lateral vibration of the claw operating shaft 26
It is composed of a pawl driving device 27 for vertically moving the shaft 6. To grasp the core components, as shown in FIG.
is lowered directly above a predetermined core component, and the pawl 2S is inserted into the handling head 16 of the core component. Then, as shown in FIG. 12, the pawl operating shaft 26 is lowered by the pawl drive device 27, and the lower end of the pawl 25 is opened and engaged with the handling head 16 of the core component. In this state, when the fuel exchanger main body 20 is raised by the lifting drive device 23, the core components can be taken out from the reactor core. When introducing new fuel into the reactor core, the two steps can be performed in reverse. A device similar to this fuel exchanger is published in Japanese Patent Publication No. 137293 of 1981.

FIG. 13 shows the control rod drive.

The control rod drive device 28 can be roughly divided into a drive section 29 and an upper guide tube 30. The upper guide tube 30 is supported at the upper surface of the small rotating plug 4 and is installed in a furnace in an atmosphere of primary coolant sodium 6 and argon gas, and its lower end is connected to the control rod 18 via a gripper 31. are doing. The drive unit 29 is a core upper mechanism 3 located on the small rotation plug 4.
2 and installed at the top of the upper guide tube 30. The gripper 31 is opened and closed by operating the operating shaft 10 up and down in a manner similar to that of a fuel exchanger.

[Problem to be solved by the invention]

As mentioned above, the fuel exchanger and the control drive device constitute the handling device for the core components, but in the above-mentioned nuclear reactor, in addition to the fuel exchanger, the control drive mechanism is installed on the small rotating plug. Since the upper core mechanism is also installed, the diameter of the small rotating plug increases, and accordingly the diameter of the large rotating plug also increases. Furthermore, the diameters of the small-rotation plug and the large-rotation plug are determined to be large so that the refueling machine can access above all of the core components to be handled by rotating both of the rotary plugs. Therefore, for the purpose of downsizing the structure of a fast breeder reactor and reducing construction costs, there is a limit to the reduction in the diameter of the large rotating plug in the conventional technology.

The first object of the present invention is to provide a nuclear reactor in which the diameter of the rotating plug can be reduced and the reactor vessel can be downsized.

The second object of claim 2 is, in addition to the first object, to provide a specific structure of a reactor core component handling device.

In addition, the third object of claim 3 is the third object of claim 2.
In addition to the object of the second claim, it is an object of the present invention to provide a first concrete structure of the first lifting drive mechanism according to the second claim.

Furthermore, a fourth object of claim 4 is to provide a second specific structure of the first elevating drive mechanism of claim 2, in addition to the object of claim 2. .

Furthermore, the fifth object of claim 5 is, in addition to the object of claim 2, the first elevating drive of claim 2!
l! The purpose of this invention is to provide a third specific structure of the lJ mechanism.

Furthermore, a sixth object of claim 6 is to specifically provide a preferable arrangement relationship of each hook attached to the gripper of claim 2, in addition to the object of claim 2. be.

[Means to solve the problem]

A first configuration that achieves the above first objective includes a reactor core in which a control rod assembly containing control rods and a fuel assembly containing nuclear fuel are arranged as core components; In a nuclear reactor comprising a small rotating plug that is rotatably present above the reactor core and a control rod drive device installed on the small rotating plug, the control rod drive si can be hooked on the operating head of the control rod. a plurality of grippers having hooks protruded inwardly from each other and hooks protruded outwardly so as to be able to be caught on the operating head of the core component, each of which is located at a distance in the vertical direction; an operating head that opens and closes the gripper; a third elevating drive mechanism that drives the operation head up and down; a second elevating frame that supports the third elevating drive mechanism and the gripper; a second elevating drive mechanism that drives the second elevating frame up and down; a first elevating frame that supports a second elevating drive mechanism and the second elevating frame; a first elevating drive mechanism that drives the first elevating frame up and down; and a first elevating frame that supports the first elevating drive mechanism and makes the small rotation. 1. A device for handling core components of a nuclear reactor, characterized in that it consists of a frame installed on a plug.

A second configuration for achieving the above-mentioned second objective is a handling device for core components of a nuclear reactor, the handling device comprising a frame on a cylinder supported by a small rotating plug located above the core. , a first elevating drive mechanism supported by the frame; a first elevating frame driven up and down by the first elevating drive mechanism; a second elevating drive mechanism supported by the first elevating frame; a second elevating frame driven up and down by the elevating drive mechanism; a third elevating drive mechanism supported by the second elevating frame; a vertically long operating shaft driven up and down by the third elevating drive mechanism; An operating head is provided at the lower end of the operating shaft, and the middle section is thicker, and the upper and lower sections are thinner than the middle section, and the -E section is supported by the second elevating frame at a height that allows it to wrap horizontally with the operating head. a plurality of grippers rotatable in a direction; a protrusion formed on each gripper that protrudes toward the operating head at an upper stage, is recessed at a middle stage, and projects toward the operating head at a lower stage; and a relatively lower part of each gripper; This is a device for handling core components of a nuclear reactor, consisting of hooks that are provided on a nuclear reactor and protrude in opposite directions.

A third configuration for achieving the third object is a device for handling core components of a nuclear reactor, in which the first lifting drive mechanism includes a motor supported by a cylindrical frame and a motor rotated by the motor. It is a device for handling core components of a nuclear reactor, which is composed of a driven vertically long ball screw, and the ball screw is screwed into a first lifting frame.

A fourth configuration for achieving the fourth object is a device for handling core components of a nuclear reactor, in which the first elevating drive mechanism includes a motor supported by a cylindrical frame, and a motor supported by a cylindrical frame. A first pulley supported by the frame and rotationally driven by the motor, and a second pulley attached to the first lifting frame.

A member whose part is supported by the cylindrical frame, whose middle part is stretched over both pulleys, and whose other part is suspended from the first pulley, and a balance weight which is suspended and supported by the hanging part of the member. This is a device for handling nuclear reactor core components, which consists of:

A fifth configuration for achieving the fifth objective is a device for handling core components of a nuclear reactor, in which the first B lowering mechanism includes a rack attached vertically to the cylindrical frame; This is a device for handling core components of a nuclear reactor, which includes a pinion that engages with the rack and is rotatable, and a motor that rotationally drives the pinion.

A sixth configuration for achieving the above-mentioned sixth objective is a device for handling core components of a nuclear reactor, in which hooks provided on the gripper and facing oppositely to each other are separated in the vertical direction and horizontally. is a handling device for the core components of a nuclear reactor that are arranged in close proximity.

[Effect]

In the first configuration, the gripper is opened and closed by operating the third elevating device up and down to grasp the target core component or the target control rod.

Next, when the second lifting frame is operated up and down by the second lifting drive device, the object gripped by the gripper is moved up and down. Further, by operating the first lifting frame up and down with the first lifting drive device, core components are pulled out and inserted into the core, which is used for exchange bunraku.

In the second configuration, in addition to the action of the first configuration, when gripping an object with the first configuration, if the object is a control rod assembly or a control rod assembly, operation of the gripper is performed. By applying the upper and lower protrusions toward the head side to the upper and lower sections of the operation head and opening the gripper, the upper and lower protrusions of the gripper toward the operation head side open the gripper. The gripping action is achieved by applying the gripper to the middle part of the operating head and opening the gripper.

Third 1 above. In the cultivation, in addition to the action of the second configuration, the action of the first elevating drive device is such that when the motor rotates the ball screw, the first elevating frame is moved up and down by the screw feeding action. It has characteristics.

In the fourth configuration, in addition to the effect of the second configuration, the effect of the first elevating drive device is such that when the motor rotates the first pulley, the member stretched over the second pulley is operated and the first elevating drive device operates. The feature is that when the first lifting frame is operated up and down, the weight of the first lifting frame is balanced to a certain extent via the suspended member, which reduces the load on the motor. be.

In the fifth configuration, in addition to the effect of the second configuration, the effect of the first elevating drive device is that when the motor rotates the pinion, the pinion meshes with the rack and rotates, so that the pinion and the series of It has a characteristic effect in that the lower structure can be moved up and down.

In the sixth configuration, in addition to the effects of the second configuration, the hooks protruding from the gripper are arranged close to each other in the horizontal direction, so that the gripper can be opened and closed with sufficient margin and without any trouble inside the narrow core components. It can be done.

〔Example〕

The first embodiment of the present invention is shown in FIGS. 1a, 1b, 1c,
This is shown in FIGS. 2 and 3.

The first embodiment is as follows.

In place of the conventional control rod drive device, the core component handling device of the present invention is installed in the small rotating plug 4 at the installation location of the conventional control rod drive device. The same number of core component handling devices will be installed in the same locations as conventional control rod drive devices.

The core component handling equipment has the following configuration.

A cylindrical frame 40 is vertically installed on a small rotating plug 4 of a fast breeder reactor. Above the inner cylinder of the frame 40 is a first
A lifting drive mechanism is present.

The first elevating drive mechanism is as follows. That is, above the inner cylinder of the frame 40, a horizontal pedestal 50 is fixed to the frame 40. The frame 50 has a first motor 4
2 will be installed. A gear 51 is attached to the rotational drive shaft of the first motor 42 . The gear 51 meshes with each gear 52.

The gear 52 is attached to each screw shaft 53.

Each screw shaft 53 is rotatably supported by the pedestal 50.

A lower threaded portion of each threaded shaft 53 is screwed into the first lifting frame 54 . The first elevating frame 54 is the sleeve 5
7 and is connected by a sight frame 54a.

A second elevating drive mechanism is attached to the first elevating frame 54. The first elevating drive aJa structure is as follows. That is, the pedestal 60 attached to the first elevating frame 54 has a second
A motor 61 is installed. A gear 62 attached to the rotational drive shaft of the second motor 61 meshes with another gear 63. Each gear 63 is attached to a screw shaft 64. The upper part of each screw shaft 64 is rotatably supported by the pedestal 60, and the lower threaded part is screwed into the second elevating frame 65.

The second elevating frame 65 includes a top frame 66, a cylindrical side frame 67 coupled to the top frame 66, a frame 55 attached to the lower end of the side frame 67, and a frame 55 and an operating shaft 69. a gripper support frame 59 whose upper end is fixed to the frame 1155, and a bellows 58 connected between the frame 55 and the sleeve 56 of each sleeve 56 and 57.

A third elevating drive mechanism is attached to the second elevating frame 65. The third elevating drive mechanism is as follows. That is, a third motor 72 is installed on a pedestal 71 attached to the top frame 66. A gear 73 attached to the rotational drive shaft of the third motor 72 meshes with another gear 74.

Each gear 74 is attached to a screw shaft 75. Each screw shaft 7
5 has an upper portion supported by a frame 71 so as to be freely rotatable, and a lower screw portion screwed into an operating shaft support frame 76.

The upper end of the operating shaft 69 is fixed to the operating shaft support frame 76 .

The side frame 67 is divided into an upper frame 77 and a lower frame 78, as shown in FIG. This magnetic link mechanism 79 consists of an electromagnet 80 supported by a frame 77, a cylindrical main body frame 81 attracted by the electromagnet 80, and links 82 and 83 connecting the main body frame 81 and the magnet side.

The link 82 engages with a protrusion of the frame 78. On the other hand, the operating shaft 69 is configured such that the lower end of the upper operating shaft 84 is tightly inserted into the upper end of the lower operating shaft 85 so that the operating shaft 69 is connected in the middle.

As shown in FIG. 2, the lowermost part of the gripper support frame 59 has an outer diameter that can be inserted into the handling head 16 of the control rod assembly 13 or fuel assembly 11, 12, and the upper part can be inserted into the handling head 16. It has a large outer diameter that cannot be used.

As shown in FIG. 2, three grippers 87 are attached to the lower part of the gripper support frame 59 by shafts 86 in an equiangular arrangement.
It can be opened and closed from the state shown in the figure to the state shown in FIG. 3, or vice versa.

The shape of each gripper 87 is as follows. That is, the gripper 87 is provided with protrusions 88 and 89 protruding inward at its upper end and intermediate portion. The upper hook 90 protrudes outward.

The lower hook 91 projects inward. Although the hooks 90 and 91 are spaced apart in the vertical direction, they are not far apart in the horizontal direction, so the hooks 90 and 91
．． Even if the grippers 91 are protruding from the left and right sides, the gripper 87 can be inserted into the narrow handling head 16.

The handling head 19 attached to the upper end of the control rod 18 in the control rod assembly 13 has a shape that protrudes horizontally outward so that it can be hooked with a lower hook 91. The handling head 16 of the control rod assembly 13 and the fuel assembly 11.12 has a shape that protrudes horizontally inward so that it can be hooked onto the upper hook 90.

An operating head 92 is provided at the lower end of the operating shaft 69. The operating head 92 has an upper portion 93 and a lower portion 94 having a smaller diameter than a middle portion 95.

The operation of the first embodiment having the above configuration is as follows.

When the first motor 42 is driven, the rotational force of the motor 42 is transmitted to each gear, and the screw shaft 53 is rotated. Screw shaft 5
3 rotates, the first lifting frame 54 and its lower structural parts can move up and down.

When the first elevating frame 54 is lowered, the lower end of the gripper support frame 59 is attached to the handling head 1.
It can be inserted into 6.

Next, when the third motor 76 is driven, each gear 73.74
rotates, and the screw shaft 75 rotates.

When the pedestal 71 descends due to the rotation of the screw shaft 75, the operating shaft 69 descends with the extension of the bellows 70, and as a result, the middle portion 95 of the operating head 92 hits the protrusion 88. As a result, the lower ends of the grippers 87 are closed as each gripper 87 rotates around the shaft 86. When each gripper 87 is closed, the handling head 19 of the control rod 18 is caught by the hook 91 of each gripper 87 .

Next, when the second motor 61 is driven to rotate each of the gears 62 and 63, the screw shaft 64 also rotates, and the second elevating frame 65 moves in the vertical direction. With each gripper 87 gripping the handling head 19 of the control rod 18, the second
When the elevating frame 65 is moved up and down, the control rod 18 can also be moved up and down in the same direction as the amount of movement.

When the control rods 18 move downward and are inserted deeply into the core of the nuclear reactor, the output of the reactor decreases, and conversely, when the control rods 18 are inserted shallowly, the output increases relatively.

In this way, the power of the reactor is controlled.

When the power of a nuclear reactor becomes abnormally high, the temperature of the reactor coolant becomes higher than normal. In that case, the function of the electromagnet 80 of the magnetic link mechanism 79 is cut off, so
The main body frame 81 descends as shown by the two-dot chain line in FIG. 1C, and the links 82 and 83, which have been bent up until now, change to be on a straight line in an oblique direction. As a result, the engagement between the link 82 and the frame 78 is released, and the frame 78
descends and violently collides with the upper end of the lower operating shaft 85.

Due to the impact force, the lower operating shaft 85 is separated from the upper operating shaft 84 and descends together with the frame 78. As a result, the control rods 18 are also lowered, and the control rods 18 are rapidly inserted deep into the core of the reactor, independently of the motors. As a result, the power of the reactor is reduced and a safe state is achieved.

Next, when handling the control rod assembly 13 and various fuel assemblies 11 and 12, which are core components, operations are as follows.

That is, by driving the first motor 42, the first lifting frame 54 is lowered, the lower end of the gripper support frame 59 is shallowly inserted as shown in FIG. 3, and then the third motor 72 is driven to lower the operating shaft 69. 3, the lower end of each gripper 87 is opened by bringing the protruding part 88 of the gripper 87 into contact with the upper stage part 93 of the operating head 92 and the protruding part 89 with the lower stage part 94, respectively. Each gripper 87
When opened, the hook 90 and the handling head 16 overlap vertically as shown in FIG. Thereafter, when the first elevating frame 54 is raised by driving the first motor 42, the second elevating frame 65, the operating shaft 69, and the gripper support frame 59 simultaneously move by the same amount in the same direction. As a result, each gripper 87 rises in an open state,
The hook 90 is hooked on the handling head 16, and the control rod assembly 13 and various fuel assemblies 11, 12 can be pulled out of the reactor core.

Thereafter, the control rod assembly 1.3 and various fuel assemblies 11.12, which have been pulled up by the horizontal rotation action of the large-rotation plug and the small-rotation plug 4, are positioned above the pockets existing around the outside of the core. Next, the control rod assembly 13 and various fuel assemblies 11 and 12 that have been pulled up by driving the first motor 42 in the opposite direction are lowered into the pocket. Thereafter, by driving the third motor 72, the operating shaft is raised and each gripper 87 is closed. Each gripper 87
While keeping the grippers closed, the first motor 42 or the second drive motor 61 is driven to raise the gripper support frame 59 and remove each gripper 87 from the handling head 16.

New control rod assemblies 13 and various fuel assemblies 1 in the pocket are moved by the reverse operation of moving the control rod assemblies 13 and various fuel assemblies 11 and 12 from the core of the reactor to the pockets.
1.12 can be picked up by each gripper 87 and transferred into the reactor core.

As described above, according to the first embodiment, the output of the reactor is controlled by controlling the insertion position of the control rods 18 into the reactor core, and when an abnormality occurs in the reactor, the magnetic linkage mechanism 79 is used to separate the middle part of each rod. The weight of the structure above the control rod is added to the control rod 18 regardless of the motor, and the control rod is rapidly inserted into the reactor core to stop the output of the reactor in an emergency. Exchange work can be accomplished.

In this way, the control rods and fuel assemblies, which are core components, can be operated and replaced in the space where the control rod drive device was previously installed, so the space where the fuel exchanger was previously installed can be removed. The diameter of the announced rotating plug 4 and the diameter of the large rotating plug surrounding the small rotating plug 4 can be significantly reduced. As a result, the size of the reactor vessel can be reduced. In addition, the physical quantities of the reactor structure are deleted,
The nuclear reactor structure can be made economically efficient.

FIG. 4 shows a second embodiment of the invention.

The second embodiment is an example in which the first elevating drive device is modified from the structure of the first embodiment, and only the modified portions will be described below.

That is, a rack 45 is provided on the wall surface above the inner cylinder of the frame 40.
is fixed vertically. The pinion 43 meshed with the rack 45 is rotatably attached to the pedestal 37. Also,
A first motor 42 is installed on the pedestal 37 that supports the first elevating frame 54, and one pinion 43 is directly engaged with the driving wheels 97 that are rotationally driven by the first motor 42, and the other pinion 43 is connected to an idle small gear. They are engaged via 98.

With this structure, when the first motor 42 is driven, each pinion 43 rotates while meshing with the rack 45, so that the first elevating frame 54 can move up and down.

Since the other parts are the same as the first embodiment, the second embodiment can also achieve the same effects as the first embodiment.

The third embodiment shown in FIG. 5 also has the structure of the first embodiment.
This is a modification of the first elevating drive device, and the structure of other parts is the same as the first embodiment. Therefore, only the changed parts will be explained below.

That is, the first motor 42 is installed on a pedestal 50 fixed to the frame 40. One end of a rope 100 is fixed to the lower surface of the frame 50 by a rope clamp 99. The middle of the rope 100 is passed through a pulley 46 attached to the first elevating frame 54, and then passed through a pulley 48 attached to the lower surface of the pedestal 50, and the other end of the rope 100 is fixed to a balance weight 101. First motor 42
The gear 102 that is rotationally driven is the gear 1 coaxial with the pulley 48.
It is meshed with 03.

For this purpose, when the first motor 42 is driven, each gear 10
2,103 rotates, and the pulley 48 also rotates. Therefore, the first elevating frame 54 can be moved up and down.

Since the other parts are the same as the first embodiment, the third embodiment can also achieve the same effects as the first embodiment.

〔Effect of the invention〕

In any of the claimed inventions, the spacer that conventionally installed the fuel exchanger can be removed, and the reactor can be made smaller.

Furthermore, according to the invention of claim 2, it is possible to provide a specific configuration for achieving miniaturization of the nuclear reactor.

Furthermore, according to the invention of claim 3, in addition to the effects provided in claim 2, it is possible to provide a specific structure of the first elevating drive mechanism.

Moreover, according to the invention of claim 4, in addition to the effects provided in claim 2, it is possible to provide another specific structure that can reduce the driving force of the first elevating drive mechanism.

Further, according to the invention of claim 5, in addition to the effects provided in claim 2, it is possible to provide still another specific structure of the first lifting/lowering drive mechanism.

According to the invention of claim 6, in addition to the effects provided in claim 2, it is possible to provide a hook layout that allows the gripping operation by opening and closing the gripper to be performed without any trouble even if the interior of the handling head is unwieldy.

[Brief explanation of the drawing]

FIG. 1a shows a first embodiment of the invention and is a longitudinal sectional view of a device for handling core components. FIG. 1b shows a first embodiment of the present invention, and is a longitudinal cross-sectional view showing the internal structure of a device for handling core components. FIG. 1c shows a first embodiment of the present invention, and is a longitudinal sectional view showing an example of the magnetic link mechanism shown in FIGS. 1a and 1b. FIG. 2 shows a first embodiment of the present invention, and is a longitudinal sectional view showing a state in which the control rod handling/rad is gripped by the gripper of the core component handling device. FIG. 3 shows a first embodiment of the present invention, and is a longitudinal sectional view showing a state in which the handling head of the control rod assembly is gripped by the gripper of the core component handling device. Figure 4 shows a second embodiment of the present invention, including the reactor core! FIG. 3 is a longitudinal cross-sectional view of the component handling device. FIG. 5 shows a third embodiment of the invention, which is a longitudinal section 14 of a core component handling device. FIG. 6 is a longitudinal sectional view of the structure of a conventional fast breeder reactor. FIG. 7 is a plan layout of core components of the reactor core shown in FIG. 6. FIG. 8 is an elevational view, partially in section, of the fuel assembly shown in FIG. 6. FIG. 9 is a longitudinal sectional view of the control rod assembly shown in FIG. 6. FIG. 10 is a simplified diagram of the structure of a conventional fuel exchanger. FIG. 11 is a longitudinal cross-sectional view showing the state in which the claw of a conventional refueling machine is inserted into a core component. FIG. 12 is a longitudinal sectional view showing a state in which the claws of a conventional refueling machine grip core components. FIG. 13 is a longitudinal sectional view of a conventional control rod drive device. 1... Reactor vessel, 2... Roof deck, 3...
Large rotation plug, 4...Small rotation plug, 5...Reactor core, 1
1. Core fuel assembly, 13... control rod assembly, 16.
19... Handling head, 18... Control rod, 4
0...Frame, 42...1st motor, 43...Bini sprout. 45...Rack, 46.48...Pulley, 51.52
...Gear, 53,64,75...Screw shaft 554...
・First lifting frame, 61...Second motor, 62.6
3... Gear, 65... Second elevating frame, 69...
・Operation axis, 72...Third motor, 73.74...Gear, 86...Axis, 87...Gripper, 90.91・
...Hook, 92...Operation head, 100...Rope, 1o1...Balance weight, 102,103--
・Gear 3 Oak No. Toll $1c Mouth 2nd Mouth 3 Mouth 4th Rippo S's name - I hard 8th 1st? No. 10 ('2-Tuman 13th country)

Claims (1)

[Scope of Claims] 1. A reactor core in which control rod assemblies containing control rods and fuel assemblies containing nuclear fuel are arranged as core components; and a reactor core that is rotatable above the core. In a nuclear reactor comprising a small rotating plug existing in a plurality of grippers having hooks protruding outward so as to be able to be hooked onto the operating heads of the core components at positions separated in the vertical direction; an operating head for opening and closing the grippers; and an operating head for opening and closing the grippers; a third elevating drive mechanism to drive; a second elevating frame supporting the third elevating drive mechanism and the gripper;
a second elevating drive mechanism that drives an elevating frame up and down; a first elevating frame that supports the second elevating drive mechanism and the second elevating frame; and a first elevating drive mechanism that drives the first elevating frame up and down. and a frame that supports the first lifting drive mechanism and is installed on the small rotation plug. 2. A device for handling core components of a nuclear reactor according to claim 1, which includes a frame on a cylinder supported by a small rotating plug located above the core, and a frame supported by the frame. a first elevating drive mechanism;
a first elevating frame driven up and down by the elevating drive mechanism; a second elevating frame supported by the first elevating frame; a second elevating frame driven up and down by the second elevating drive mechanism; The third frame is supported by the lifting frame.
an elevating drive mechanism; an operating shaft that is elongated in the vertical direction and is driven up and down by the third elevating drive mechanism; an operating head that is provided at the lower end of the operating shaft and has a thicker middle section and thinner upper and lower sections than the middle section; 2. A plurality of grippers whose upper part is supported by an elevating frame at a height that can be horizontally wrapped around the operating head and are rotatable in left and right directions, and each gripper is formed with an upper part that protrudes toward the operating head. A handling device for a core component of a nuclear reactor, comprising a protrusion that is recessed at the middle stage and protrudes toward the operating head at the lower stage, and hooks that are provided at a relatively lower portion of each gripper and protrude in mutually opposite directions. 3. The device for handling core components of a nuclear reactor according to claim 2, wherein the first elevating drive mechanism includes a motor supported on a cylindrical frame, and an upper and lower shaft rotatably driven by the motor. 1. A handling device for a core component of a nuclear reactor, comprising a long ball screw, the ball screw being screwed into a first lifting frame. 4. The device for handling core components of a nuclear reactor according to claim 2, wherein the first elevating drive mechanism includes a motor supported by a cylindrical frame and a motor supported by the cylindrical frame. a first pulley rotatably driven by the motor; a second pulley attached to the first lifting frame; and a second pulley that is partially supported by the cylindrical frame and has an intermediate portion spanned between the two pulleys. 1. A device for handling core components of a nuclear reactor, comprising a member whose portion is suspended from the first pulley, and a balance weight suspended and supported by the hanging portion of the member. 5. The device for handling core components of a nuclear reactor according to claim 2, wherein the first elevating drive mechanism engages with a rack vertically attached to the cylindrical frame and the rack. A device for handling core components of a nuclear reactor, which includes a rotatable pinion and a motor that rotationally drives the pinion. 6. The device for handling core components of a nuclear reactor according to claim 2, wherein the hooks provided on the gripper and facing in opposite directions are separated from each other in the vertical direction and are close to each other in the horizontal direction. A device for handling the core components of a nuclear reactor that is located.