JPH02120695A - Refueling crane - Google Patents

Abstract

PURPOSE:To reduce a size of a machinery hatch by projecting a supporting post vertically and downwardly from a cart travelling laterally and by attaching a telescopic mast part in which a fuel assembly hung by a gripper tube can be housed, turnably around the post. CONSTITUTION:When a gripper tube 38 is drawn up, a fuel assembly 14 is housed in an inner mast 43 and is supported by a supporting metal fixture 55 and then the inner mast 43 is housed in an outer mast 42 and an outer mast 42 is housed in a turnable mast 41, in turn, in this situation, when a bottom lid 46 is closed, the fuel assembly 14 is held at a condition that the fuel assembly is housed in a mast part 39, even though opening a fuel gripping mechanism 37 of the gripper tube 36. After that, a stopper 60 of the gripper tube 36 is turned over and the fuel assembly 14 is drawn out of the inner mast 43. Then, a piston device 40 is actuated to turn around the mast part 39 at a rotating angle of 90 degree and to place it at horizontal position. In this case, the whole height of a refueling crane can be reduced and a machinery hatch size and a size of a gate part can be sized rather smaller, accordingly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a refueling crane used in fuel handling equipment in a nuclear couplant.

[Prior Art] The conventional refueling crane used in fuel handling equipment consists of a bridge-shaped traveling truck that runs above the reactor cavity, a transverse truck that moves on this traveling truck, and a vertical truck that moves from the horizontal truck. The gripper tube extends downward and has a fuel gripping mechanism for gripping the fuel assembly.

FIG. 6 shows an example of fuel handling equipment using such a conventional fuel exchange crane 1. As shown in FIG.

As shown in the figure, the reactor vessel 2 is installed in a shield 4 at the bottom of the containment vessel 3, and radiation from the reactor core 6 can be shielded by filling the reactor cavity 5 with water during the refueling period. ing. Further, a fuel handling building 7 is provided adjacent to the containment vessel 3, and other fuel handling equipment, storage equipment, and inspection equipment are housed inside the building.

The spent fuel pit 8 in the fuel handling building 7, which is always filled with water, is connected to the reactor cavity 5 in the containment vessel 3 by a fuel transfer pipe 9, and when necessary, this fuel transfer pipe 9 can be isolated. By opening the valve 10 and the blind flange 11,
The reactor cavity 5 and the spent fuel bin 8 can be interconnected.

When replacing the fuel, first, the reactor vessel lid 12 of the reactor vessel 3 is lifted up by the polar crane 13 and temporarily placed at a designated position on the operating floor. Next, the fuel assembly 14 in the reactor core 6 is lifted up by the fuel exchange crane 1, transferred to the vicinity of the fuel transfer pipe 9, and stored in the container 15. Thereafter, the container 15 is placed horizontally, and the fuel assembly 14 is transferred to the spent fuel bit 8 through the fuel transfer pipe 9 by the fuel transfer device 16 while remaining in the container 15. The container 15 is made upright again within the spent fuel pit 8, and the fuel assembly 14 is lifted from the container 15 by the spent fuel bit crane 17 and moved to a predetermined position within the spent fuel bit 8.

The fresh fuel 1'''I collection itself is lowered into the spent fuel pit 8 by the new fuel elevator 18 and placed in the spent fuel rack 19 by the spent fuel bit crane 17 etc., but when the fuel is replaced, , is transferred from this spent fuel rack 19 and loaded into the reactor core 6 in a procedure that is almost the reverse of the above.

As can be understood from the above explanation, in refueling using the refueling crane 1 shown in FIG. There is a problem in that it requires several facilities, and the receiving and transferring of fuel assemblies between these facilities is complicated.

Therefore, as shown in FIG. 7, a large equipment hatch 20 is connected between the containment vessel 3 and the fuel handling plate building 7, and the refueling crane is connected not only to the containment vessel 3 but also to the fuel handling building through this equipment hatch 20. A method has been proposed that can also be used within 7. The conventional refueling crane 21 that is considered to be used in this system has a traverse truck 22.
A mast section 23 that expands and contracts in a telescopic manner is installed vertically downward, and the fuel F4 assembly 14 lifted up by a gripper tube is stored in the mast section 23 and transferred in an upright state. .

[Problems to be Solved by the Invention] However, since the fuel exchange crane 21 shown in FIG. 7 described above transports the fuel assembly 14 in an upright layer, its vertical length is large. Therefore, the dimensions of the equipment hatch 20 must also be increased. For this reason, the opening of the containment vessel 3 becomes large, which poses a problem in terms of strength.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a refueling crane that can solve these problems.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a bridge-shaped traveling truck that travels on a reactor cavity, a transverse truck that moves on the traveling truck, and a transverse truck that moves on the traveling truck. It moves up and down and grabs fuel 11! A telescopic refueling crane comprising a gripper tube having a side at its lower end, in which a support column extends vertically downward from the traversing truck, and is capable of accommodating a fuel assembly lifted by the gripper tube. The present invention is characterized in that a mast part that can be expanded and contracted in a shape is rotatably attached to the support column.

[Function] According to the present invention, the mast section that accommodates the fuel assemblies can be rotated to a horizontal state, making it possible to keep the overall height of the fuel exchange crane low when transporting the fuel assemblies. Become.

[Embodiments] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 and 2, the refueling crane 30 according to the present invention is constructed by bridging between rails 31 provided at both edges of the reactor cavity 5, as in the conventional case.
A traveling truck 32 that moves along the traveling truck 32, a traversing truck 33 that moves on the traveling truck 32, a hoisting device 34 installed on the traversing truck 33, and a gripper that is suspended from the hoisting device 34 by a wire 35 and moves up and down. A tube 36 is provided. A well-known fuel gripping mechanism 37 is provided at the lower end of the gripper tube 36 for gripping the upper nozzle of the fuel assembly 14.

A pair of support columns 38 extend vertically downward from the lower surface of the traversing truck 33, and a mast section 39 is rotatably supported at the lower end thereof. When the mast section 39 is vertically closed, the mast section 39 should be positioned so that its axis coincides with the axis of the gripper tube 36. It's decided.

Further, a mast device 40 is attached to the support column 38, whereby the mast portion 39 can be rotated and held in a horizontal state.

As clearly shown in FIGS. 3 and 4, the mast section 39 is
It is composed of a rotating mast 4I, an outer mast 42, and an inner mast 43. The outer mast 42 is housed inside the rotating mast 41, and the inner mast 43 is housed inside the outer mast 42, making it a so-called telescopic telescopic structure. There is.

The lower end of the support column 38 pivots around the central portion in the longitudinal direction of a rotating mast 41, and the tip of a piston rod 44 of a piston device 40 is also connected to the rotating mast 41.

Further, the lower end opening of the rotating mast 41 is opened and closed by a bottom cover 46 driven by a drive mechanism 45 attached to the lower outer surface of the rotating mast 41.

As will be described in detail below, the bottom cover 46 closes the lower end opening of the rotating mast 41 when the fuel assembly 14, the inner mast 43, and the outer mast 42 are housed in the rotating mast 41, and closes the lower end opening of the rotating mast 41 and closes the fuel grip of the gripper tube 36. Even if the machine t1137 is opened, the fuel assembly 14 is prevented from falling from the mast part 39.

As shown in FIG. 4, which is a cross-sectional view taken along line P-P in FIG. In contact with the outer surface, the outer mast 42 can be smoothly expanded and contracted with respect to the rotating mass j to 41.

Also, a plurality of rollers 48 are provided on the outer mast 42 for the same purpose.
is provided and is in contact with the outer surface of the inner mast 43.

An inward stopper 49 is attached to the upper end of the rotating mast 41, and this is for restricting upward movement of the outer mast 42. Further, stoppers 5o and 51 are attached to the upper outer surface of the outer mast 42 and the lower inner surface of the rotating mast 41, respectively, to prevent the outer mast 42 from falling off from the rotating mast 41. Similarly, six stoppers 5253 are provided on the lower inner surface of the outer mast 42 and the upper outer surface of the inner mast 43, respectively. Further, an outward stopper 54 at the lower end of the inner mast 43 is provided to limit its upward movement. In addition, stopper 5
1.52 also serves to prevent the masts 41, 42, 43 from rotating circumferentially relative to each other.

In addition, the metal fitting 55 attached to the inner mast 4.3 is used when the fuel assembly 14 is housed in the inner mast 43.
This is a holding metal fitting for holding this.

The gripper tube 36 is suspended by a wire 35 and is moved up and down by driving the hoisting device 34, but in order to make the movement smooth and keep the direction constant,
A roller 56 is attached to the outer surface of the gripper tube 36 and adapted to engage a rail 57 attached to the post 38. Furthermore, a rail 58 is provided on the inner surface of the inner mast 43 over its entire length, and when the mast section 39 is vertical, it is aligned in a straight line with the rail 31 of the support column 38, and the gripper tube 36 is inserted into the inner mast 43. It can be introduced smoothly.

Furthermore, there is a stopper 60 on the outer surface of the gripper tube 36 that can be tilted by a hydraulic cylinder 59, and by raising the stopper 60 when pulling up the gripper tube 36 inserted into the inner mast 43, the inner mast 43 can be lifted up. It is possible to engage with an inward stopper 61 at the upper end of 43 and pull it up together.

Next, in a nuclear couplant in which the containment vessel 3 and the fuel handling building 7 are communicated with each other by an equipment hatch 7o as shown in FIG. I will explain what happens when I do this.

First, the reactor cavity 5 is filled with water, the lid (not shown) is removed from the reactor vessel 2 by the polar crane 13, and the hatch lid 1 of the equipment hatch 7o is removed, after which the traveling truck 32 and the traversing truck 33 are operated. Then, the mast portion 39 of the refueling crane 3o is placed at a predetermined position above the reactor vessel 2. At this time, the mast section 39 is in a vertical state, and the lower f4IPff opening of the rotating mast 41 is at the bottom M4.
It is closed by B and is in a shortened state.

Next, the hoisting device 34 is operated, the gripper tube 36 is inserted into the inner mast 43 of the mast section 39, and the stopper 60 is protruded by the hydraulic cylinder 59, so that the inner mast 4
3 to engage with the stopper 61 at the upper end. And the bottom! 4
6 is opened by the drive mechanism 45, and the gripper tube 36 is gradually lowered. At this time, the stopper 60 of the gripper tube 36 and the stopper 61 at the upper end of the inner mast engage, and the stopper at the lower end of the inner mast 43 engages with the stopper 60 of the gripper tube 36. 54 and outer mast 4
2 is engaged with the lower end of the gripper tube 36.
, the inner mast 43 and the outer mast 42 are lowered together. When the stopper 50 of the outer mast 42 contacts the stopper 51 of the rotary mast 41, the outer mast 42 cannot be lowered any further, so only the inner mast 43 is lowered together with the gripper tube 36. thus,
When the stopper 53 of the inner mast 43 engages with the stopper 52 of the outer mast 42 and the total length of the mast section 39 becomes maximum, the fuel gripping mechanism 37 of the gripper tube 36 protrudes downward from the lower end opening of the inner mast 43 and the core 6 Fuel assembly 1 inside
4. Grasp the upper nozzle. This is the state shown by the two-dot chain line in FIG.

When the gripper tube 36 is pulled up, the fuel assembly 14
is housed in the inner mast 43 and held by the holding fitting 55, and in turn, the inner mast 43 is housed in the outer mast 42, and the outer mast 42 is housed in the rotating mast 41. And the bottom'
When the fi 46 is closed, the state shown in FIG. 3 is achieved, and even if the fuel grip side 37 of the gripper tube 36 is opened, the fuel assembly 14 is held in the form housed in the mast section 39.

After this, knock down the stopper 60 of the gripper tube 36,
Then, the piston device 40 is pulled out from the inner mast 43.
is activated to rotate the mast section 39 by 90 degrees and place it under water. At this time, the fuel assembly 14 is held by the holding fittings 55, so there is no risk of it shaking inside the inner mast 43.
The refueling crane 30 is moved from there to the fuel handling building 7 via the equipment hatch 70. Here, in FIG. 5, a two-dot chain line 20 is attached to the equipment hatch 70, which indicates the size of the conventional equipment hatch.
By using the refueling crane 30 according to the present invention, 8! It will be appreciated that the dimensions of the vessel hatch can be significantly reduced.

Once the fuel exchange crane 30 is placed at a predetermined position in the fuel handling building 7, the mast section 39 is returned to the vertical position, and the gripper tube 36 is inserted into the mast section 39 again to grip the fuel assembly 14. B-Bottom! 246 is opened and the fuel assembly 14 is lowered into a predetermined position on the spent fuel bit 8.

When loading new fuel assemblies into the reactor core 6, the new fuel assemblies placed in advance on the spent fuel racks 19 of the fuel handling building 7 are stored in the mast section 39 of the refueling crane 30, and then , just perform the procedure in reverse to the above.

[Effects of the Invention] As described above, in the refueling crane according to the present invention, the mast section that accommodates the fuel assembly can be placed in a horizontal state, so the overall height of the refueling crane can be reduced. . Therefore, when this refueling crane is used in fuel handling equipment that communicates the containment vessel with the fuel handling equipment through the equipment hatch, it is possible to downsize the equipment hatch and the gate, allowing the containment vessel to be smaller. Strength problems can also be resolved.

[Brief explanation of the drawing]

1 (2I) is a front view showing one embodiment of the refueling crane according to the present invention, FIG. 2 is a side view of the refueling crane shown in FIG. 1, and FIG. 3 is a refueling crane shown in FIG. 1. FIG. 4 is a longitudinal sectional view of the mast section of the crane, FIG. 4 is a sectional view taken along line P-P in FIG. 3, and FIG. 5 is a schematic diagram showing a refueling method using the refueling crane according to the present invention. Explanatory drawings, Figures 6 and 7
Each of the figures is a schematic explanatory diagram showing a fuel exchange method using a conventional fuel exchange crane.
...Fuel handling building 8...Spent fuel pit 14...
・Fuel assembly 30...Fuel exchange crane 32・
...Traveling cart 33...Traversing cart 36...Gripper tube 37...Fuel gripping mechanism 38...Support 39...Mast part 40...Piston device 41...Rotating mast 42...Outer mast 43 ...inner mast

Claims (1)

[Claims] A refueling system comprising: a bridge-shaped traveling truck that travels above a reactor cavity; a transverse truck that moves on the traveling truck; and a gripper tube that is moved up and down from the horizontal truck and has a fuel gripping mechanism at its lower end. In the crane, a strut is vertically extended downward from the transverse truck, and a telescopically extensible mast part capable of accommodating the fuel assembly lifted by the gripper tube is rotatable on the strut. A refueling crane characterized by being installed.