JPH11160483A - Refuel machine for fast reactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify structure and miniaturize refuel machine and to reduce the amount of materials by incorporating a drive source for opening/closing a gripper nib and a gripper nib opening/closing mechanism into a gripper and incorporating a drive source for elevating the gripper and a gripper elevation mechanism into the gripper and a gripper elevation guiding body. SOLUTION: A grip-opening/closing motor 12 for gripping and releasing a fuel 20 is incorporated into a gripper 6 being located in a reactor, and a gripper elevation motor 7 for pulling the fuel 20 from a core barrel and inserting it into the reactor core is incorporated into a gripper elevation guiding cylinder 4 being located in the reactor. Then, a grip-opening/closing bar 14 is moved up and down by the motor 12 via a ball screw 13 and a nib 15 of the gripper 6 is opened and closed, thus gripping or releasing the fuel 20. Also, a rotary mechanism 8 of the gripper 6 is rotated by the gripper elevation motor 7, the entire gripper 6 is elevated in the guiding cylinder 4 due to the rotation of an external thread 9 of the rotary mechanism 8 being screwed to the internal thread 5 of the guiding cylinder 4, and the fuel 10 is pulled from the core barrel or is inserted into it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fast reactor fuel exchanger.

[0002]

2. Description of the Related Art FIG. 6 shows an overall structure of a conventional example of a fuel exchanger for a liquid metal sodium cooled reactor which is a fast reactor, and FIG. 7 shows a gripper structure.

The fuel exchanger for a liquid metal sodium-cooled reactor shown in FIGS. 6 and 7 is mounted on a shielding plug 1 located above the reactor structure only at the time of refueling. 2, gripper 6, pantograph arm 25, pantograph opening / closing arm 26, hold-down arm 27, gripper lifting / lowering guide cylinder 4, gripper lifting / lowering drive device 28, wire rope winding machine 29, wire rope 30, pantograph drive device 31, pantograph shaft 32 Gripper claw opening / closing drive device 33, claw opening / closing shaft 34,
It is composed of a link 35 and the like.

[0004] Opening and closing of the claws of the gripper 6 (gripping and releasing of the fuel 20) is performed by a gripper claw opening / closing drive device 33 located outside the furnace at the top of the refueling machine main body 2 and drives the inside of the refueling machine main body 2 to open / close the gripper claw. This is performed by vertically moving the pawl opening / closing shaft 34 that has descended from the device 33 to the pantograph arm 25.

FIG. 7 shows a state in which the fuel 20 is gripped. In this state, the claw opening / closing shaft 34 is pushed down by the gripper claw opening / closing drive device 33, so that the pantograph arm 25
Is raised (the gripper 6 side), the pawl opening / closing rod 14 connected to the distal end of the pantograph arm 25 via the link 35 is also raised, the pawl 15 is closed, and the fuel 20 is released from the gripping state. In addition, contrary to the above, the closed claw 15
When the claw opening / closing rod 14 is pushed down after the fuel is inserted into the fuel 20, the claw 15 is opened and the fuel 20 is grasped.

[0006] The lifting and lowering of the gripper 6 for pulling out the fuel 20 from the core tank and inserting the fuel 20 into the core tank is performed by using a wire rope winder 29 of a gripper lifting drive unit 28 located outside the furnace. Gripper 6 at the lower end via
Is performed by raising and lowering the refueling machine main body 2 to which is attached. At this time, the gripper 6 is held by the hold-down arm 27 integrated with the hold-down body 36 attached to the shielding plug 1.
Is moved up and down in the gripper lifting guide tube 4 attached to the tip of the gripper.

[0007]

In the prior art shown in FIGS. 6 and 7, the gripper claw opening / closing drive device 33 is provided inside the fuel exchanger body 2 and the claw opening / closing shaft 34 is provided at the uppermost portion of the fuel exchanger body 2. In addition to the necessity of being incorporated in the fuel exchanger main body 2 from the gripper claw opening / closing drive device 33 located outside the furnace to the pantograph arm 25 located inside the furnace,
Since it is necessary to install the gripper lifting drive 28 outside the furnace, the structure of the refueling machine becomes complicated, and the external dimensions become large.

The present invention has been made in view of the above points, and an object of the present invention is to provide a fast reactor refueling machine which has a simplified structure and a reduced size, and has a reduced physical quantity.

[0009]

In order to achieve the above object, a fast reactor refueling machine according to the present invention has structural features as described in claims 1 to 5 of the claims. According to claim 1, which is an independent claim, a gripper elevating guide attached to a refueling machine body adapted to be installed in a reactor vessel during refueling,
A gripper disposed so as to be able to ascend and descend along the gripper elevating guide, and having a gripper claw for gripping and releasing fuel in the reactor vessel, and a gripper claw opening / closing drive for opening and closing the gripper claw of the gripper A fuel source and a gripper claw opening / closing mechanism; and a gripper elevating drive source and a gripper elevating mechanism for withdrawing fuel from the core tank and inserting it into the core tank. An opening / closing drive source and a gripper claw opening / closing mechanism are incorporated in a gripper, and the gripper elevating drive source and the gripper elevating mechanism are incorporated in a gripper and a gripper elevating guide.

[0010]

A gripper claw opening / closing drive source for gripping and releasing the fuel 20 is incorporated in the gripper 6 located in the furnace, and the gripper is lifted and lowered to pull out the fuel 20 from the core tank and insert the fuel 20 into the core tank. In order to incorporate the driving source for use into the gripper lifting guide tube 4 located in the furnace, the conventional gripper claw opening / closing drive device 33 and claw opening / closing shaft 34 shown in FIGS.
In addition, the need for the gripper lifting drive 28 is eliminated.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a gripper structure of a telescopic arm type fuel exchanger which is an embodiment of the fuel exchanger for a fast reactor according to the present invention, FIG. 2 shows a cross section AA of FIG. 1, and FIG. Shown in The telescopic arm type fuel exchanger shown in FIGS.
It is installed on the shielding plug 1 located above the reactor structure only at the time of refueling.

The telescopic arm type fuel exchanger shown in FIGS. 1 to 3 uses a hollow motor as a gripper claw opening / closing drive source and a gripper lifting / lowering drive source. Guide tube 4, female screw 5, gripper 6, gripper lifting motor 7 (hollow motor)
, Rotating mechanism 8, male screw 9, guide key 10, thrust bearing 11, claw opening / closing motor 12 (hollow motor), ball screw 13, claw opening / closing rod 14, claw 15, ball bearing 16, axial slit 17, cable 18, gas It comprises a hole 19 and the like.

A rotating mechanism 8 is attached to the lower end of the rotating hollow shaft of the gripper lifting motor 7. The nut of the ball screw 13 is attached to the lower end of the rotary hollow shaft of the claw opening / closing motor 12. The cable 18 for supplying power to the gripper lifting / lowering motor 7 and the claw opening / closing motor 12 has a coil spring, and has a structure that can expand and contract with the vertical movement of the gripper 6.

A gas vent hole 19 is provided in the upper part of the gripper lifting guide cylinder 4. The opening and closing of the claw 15 of the gripper 6 (gripping and releasing of the fuel 20) is performed by vertically moving the claw opening and closing rod 14 via a ball screw 13 by a claw opening and closing motor 12 incorporated in the gripper 6.

The lifting mechanism 6 for pulling out the fuel 20 from the core tank and inserting it into the core tank moves the rotation mechanism 8 of the gripper 6 incorporated in the gripper lifting guide tube 4 above the gripper 6. The rotation is performed by a gripper lifting / lowering motor 7 serving as a gripper lifting / lowering drive source. When the rotation mechanism 8 rotates, the gripper 6 as a whole becomes a male screw 9 on the rotation mechanism side and a female screw 5 on the gripper lifting guide cylinder 4 side.
Is moved up and down in the gripper elevating guide cylinder 4 by a gripper elevating mechanism constituted by a combination of

As shown in FIG. 2, in order to prevent the fixed side rotation of the gripper lifting motor 7 when the gripper 6 is raised and lowered, the gripper 6 is attached to the tip of a guide key 10 located at the uppermost part of the gripper lifting motor 7. Ball bearing 1
6 slides on the inner surface of an axial slit 17 provided on the side surface of the gripper lifting guide tube 4.

As shown in FIG. 3, the gripper elevating guide tube 4 is set on the fuel 20 to be replaced by extending and retracting the telescopic arm 3, and the fuel 20 is gripped by the gripper 6, and the gripper elevating guide tube 4 To transport the fuel 20 to a predetermined position.

As the driving source for opening and closing the gripper claw and the driving source for lifting and lowering the gripper, a rotating machine using fluid pressure may be used instead of the electric motor.

FIG. 4 shows a gripper structure using a reciprocating cylinder as a drive source for opening and closing a gripper claw of a telescopic arm type fuel exchanger which is an embodiment of the fuel exchanger for a fast reactor of the present invention. Opening and closing of the claw 15 of the gripper 6 for gripping and releasing the fuel 20 is performed by a claw opening / closing rod 14.
Is moved up and down by a reciprocating cylinder 21 incorporated in the gripper 6.

FIG. 5 shows a gripper structure using a rack and pinion as a gripper elevating mechanism of a telescopic arm type fuel exchanger which is one embodiment of the fast reactor fuel exchanger according to the present invention. The lifting and lowering of the gripper 6 for pulling out the fuel 20 from the core tank and inserting the fuel 20 into the core tank is performed by placing the pinion 23 of the gripper 6 meshing with the rack 22 attached to the inner surface of the gripper lifting guide tube 4 above the gripper 6. The rotation is performed by the pinion rotation mechanism 24 located.

[0021]

According to the present invention, the conventional gripper claw opening / closing driving device 33, claw opening / closing shaft 34 and gripper lifting / lowering driving device 28 shown in FIGS. 6 and 7 are not required. The structure can be simplified and downsized, and the amount of material can be reduced.

[Brief description of the drawings]

FIG. 1 shows a gripper structure of an embodiment of a fuel exchanger for a fast reactor according to the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is an overall structure of an embodiment of a fast reactor fuel exchanger according to the present invention.

FIG. 4 is a gripper unit using a reciprocating cylinder as a gripper claw opening / closing drive source in one embodiment of the fast reactor refueling machine of the present invention.

FIG. 5 shows a gripper structure using a rack and pinion as a gripper lifting mechanism of one embodiment of the fast reactor refueling machine of the present invention.

FIG. 6 is an overall structure of a conventional example of a fuel exchanger for a liquid metal sodium cooled reactor which is a fast reactor.

FIG. 7 is a conventional gripper structure of a fuel exchanger for a liquid metal sodium-cooled reactor as a fast reactor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Shield plug 2 ... Refueling machine main body 3 ... Expansion arm 4 ... Gripper elevating guide tube 5 ... Female thread 6 ... Gripper 7 ... Gripper elevating motor 8 ... Rotating mechanism 9 ... Male screw 10 ... ... Guide key 11 ... Thrust bearing 12 ... Claw opening / closing motor 13 ... Ball screw 14 ... Claw opening / closing rod 15 ... Claw 16 ... Ball bearing 17 ... Axial slit 18 ... Cable 19 ... Gas vent hole 20 … Fuel 21… Reciprocating drive cylinder 22… Rack 23… Pinion 24… Pinion rotation mechanism 25… Pantograph arm 26… Pantograph opening and closing arm 27… Hold down arm 28… Gripper lifting drive 29… ... wire rope winder 30 ... wire rope 31 ... pantograph drive device 32 ... pantograph shaft 3 ...... gripper closing drive device 34 ...... claw opening and closing shaft 35 ...... link 36 ...... holddown body

Continued on the front page (72) Inventor Katsuhisa Sekine 3-2-1, Sachimachi, Hitachi City, Ibaraki Prefecture Within Hitachi Engineering Co., Ltd.

Claims (5)

[Claims] 1. A gripper lifting / lowering guide attached to a refueling machine main body which is installed in a nuclear reactor vessel during refueling, and is disposed so as to be able to ascend and descend along the gripper lifting / lowering guide. A gripper having a gripper claw for gripping and releasing fuel, a gripper claw opening / closing drive source and a gripper claw opening / closing mechanism for opening and closing the gripper claw of the gripper, and withdrawing fuel from the core tank and to the core tank A fuel source for a fast reactor, comprising: a gripper lifting drive source and a gripper lifting mechanism for inserting a gripper; wherein the gripper claw opening / closing drive source and the gripper claw opening / closing mechanism are incorporated in a gripper; A fuel exchanger for a fast reactor, wherein a source and a gripper lifting mechanism are incorporated in a gripper and a gripper lifting guide. 2. The fast-reactor refueling machine according to claim 1, wherein a rotating machine driven by electric power or fluid pressure is used as the driving source for opening and closing the gripper claw and the driving source for lifting and lowering the gripper. 3. The fuel exchanger for a fast reactor according to claim 1, wherein a reciprocating cylinder of gas pressure or the like is used as the gripper claw opening / closing drive source. 4. The gripper elevating mechanism includes a male screw on a rotating mechanism side that is rotationally driven by the gripper elevating drive source, and a female screw on the gripper elevating guide body side with which the male screw is screwed. 2. The method according to claim 1, wherein
4. The fuel exchanger for a fast reactor according to any one of claims 1 to 3. 5. The gripper elevating mechanism comprises a pinion on a pinion rotating mechanism side rotatably driven by the gripper elevating drive source, and a rack on the gripper elevating guide body engaged with the pinion. The fuel exchanger for a fast reactor according to any one of claims 1 to 3, wherein: