JPH07218685A - Fuel transportation device for reactor power plant - Google Patents

Abstract

PURPOSE:To provide a fuel transportation device not using electric parts and moving parts for standing and falling mechanism by constituting the standing and falling mechanism following the movement of a dolly so as not to require special power source. CONSTITUTION:To transport a fuel assembly between a fuel pool 10 and a fuel pit 11, a fuel transportation device is provided with a running rail 6 laid horizontally, a dolly 1 capable of running along the running rail 8 and a container 2 contained in the dolly 1 which is free of rotation between horizontal state and vertical state. At both ends of the container 2, provided extending from the ends is a guided part projecting detachably from the wall of the dolly 1. In the vicinity of a specific position in the fuel pool 10 and the fuel pit 11, the standing and falling mechanisms 4, 5 receiving the guided part during the movement of the container 2 toward the specified position are provided. The standing and falling mechanisms 4, 5 stand the container 2 from horizontal state to vertical state according to the movement of the dolly 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel transfer device applied to a fuel transfer between a fuel pool on the side of a containment vessel and a spent fuel pit in a nuclear power plant.

[0002]

2. Description of the Related Art FIG. 6 shows an example of a conventional fuel transfer device. In FIG. 6, the fuel transfer device includes a fuel assembly (not shown), a fuel pool 10 in a storage container 60 and a spent fuel pit. 11 is a facility for mutual transfer via the transfer pipe 61. As shown in the drawing, the transfer pipe 61 is provided with a remote control cutoff valve 62, which is fully opened only during fuel transfer.

The fuel transfer device is provided with a trolley 63 in which the container 35 containing the above-mentioned fuel assembly is mounted so as to be able to be erected, and the trolley 63 is attached to the fuel pool 10 side and the fuel pit 11.
The fuel assembly is transferred by traveling along the rails 38 in the transfer pipe 61 and on the pedestals 36 and 37 respectively provided on the sides. During operation of the reactor, the carriage 63 is stored on the side of the spent fuel pit 11 as shown by the phantom line,
The right end thereof is connected to a loop chain 9 which is driven via a gear device 8 by a drive device 7 provided on the operation floor on the fuel pit 11 side. This loop chain 9
Are provided on both sides of the carriage 63. When the carriage 63 is moved leftward by the loop chain 9 and reaches a predetermined position shown by a solid line, the hydraulic drive device 40 provided on the operation floor 39 on the fuel pool 10 side and the raising / lowering device provided in the fuel pool 10 are provided. The container 35 is made to stand upright by 41.

A fuel assembly in the reactor is lifted by a crane (not shown) and stored in an upright container 35 from above, and the container 35 containing the fuel assembly is laid down by a raising / lowering device 41, and again mounted on a truck 34. Place it horizontally. Then, the loop chain 9 is operated to pull the carriage 34 into the fuel pit 11.

On the fuel pit 11 side, a similar water pressure drive device 40 and a raising / lowering device 41 are also provided, in which the container 35 is placed upright and the spent fuel assemblies transferred are craned (see FIG. It is lifted up (not shown) and stored in a predetermined place in the fuel pit 11. When transferring the new fuel assembly from the fuel pit 11 to the fuel pool 10, the procedure is reversed.

FIG. 7 is a perspective view showing the structure of the raising / lowering device in the above-described fuel transfer device. In FIG. 7, the hydraulic cylinder 45 is provided with a support base 46 fixed to a rail 38.
The piston shaft 47 is rotatably supported on the connecting shaft 49 that connects the respective ends of the pair of lifting arms 48.
Is connected to the connecting member 50. The other end of each lifting arm 48 has a support member 51 fixed to the rail 38.
It is supported by a pin. The connecting member 50 has a roller shaft 52.
Is provided, which is a stopper member 53 on the upper surface of the container 35.
Inserted in.

Reference numeral 54 is a support shaft for supporting the container 35 (see FIG. 6) on the carriage 63, and the piston shaft 4
When the hydraulic circuit 55 operates so that 7 moves to the left in the figure, the lifting arm 48 rotates, and the container 35 stands upright with the support shaft 54 as the center of rotation. When the fuel assembly is put in the container 35, the container is placed horizontally, and the carriage 63 is moved, the connecting member 50 and the stopping member 53, that is, the roller shaft 52 are separated.

[0008]

As can be understood from the above description, in the conventional fuel transfer device, units such as the hydraulic drive device and the tilting device other than the loop chain mechanism are provided on the fuel pool side and the fuel pit side. It is necessary to provide one set for each of them, which inevitably results in a large number of electric parts and moving parts related to the fuel transfer device. This not only increases the manufacturing cost, but also requires strict maintenance. Trouble may occur in the reversing device due to malfunction. Therefore, an object of the present invention is to prevent electric devices and movable parts of the tilting mechanism from being used as much as possible by configuring the tilting mechanism so as to follow the movement of the carriage so that a dedicated power source is not required. Another object of the present invention is to provide an improved fuel transfer device.

[0009]

To achieve the above object, the present invention provides a fuel pool for transferring a fuel assembly between a fuel pool and a fuel pit in a nuclear power plant through a fuel transfer pipe. And a traveling rail laid substantially horizontally between the fuel pits, a carriage capable of traveling along the traveling rail between first and second predetermined positions in the fuel pool and the fuel pit, and the carriage. A fuel transfer device comprising a container that is housed in a vehicle and is rotatably between a horizontal state and a vertical state and that is pivotally attached to the carriage at a substantially central portion. First and second guided portions extending from the wall of the trolley to releasably project from the wall of the trolley, and the container accommodated in the trolley near the first and second predetermined positions. Is the first and second predetermined There are provided first and second raising / lowering devices for respectively receiving the first and second guided portions when moving toward the storage, and the first and second raising / lowering devices are provided in the container. The first and second guided portions are connected to the first and second
The container is moved from the horizontal state to the first and second predetermined positions of the container while being guided to the first and second predetermined positions by being received by the tilting device. It is characterized by comprising a guide path formed so as to stand upright.

[0010]

The trolley moves toward the first predetermined position on the traveling rail in the fuel pool while containing the container.
Before reaching the first predetermined position, the guided portion provided on the container is received in the guide path of the first raising / lowering device near the first predetermined position. Since the container is rotatable,
When the cart further advances toward the first predetermined position, the shape of the guide path of the first raising / lowering device causes the container to start rotating from the horizontal state around the central portion thereof to reach the first predetermined position. When it doesn't, it will be vertical. In this vertical state, the fuel assemblies are carried in and out of the container. Also, when the carriage moves to the first predetermined position, it operates in substantially the same manner.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to FIGS. 1 to 5 of the accompanying drawings.
The same reference numerals indicate the same or corresponding parts. 1 is an explanatory view of the entire structure of a fuel transfer device according to a preferred embodiment of the present invention, FIG. 2 is an explanatory view of a tilting device on the side of a storage container, and FIG. 3 is on the side of a fuel pit. Illustration of the tilting device,
FIG. 4 is an explanatory view of the carriage and the container, and FIG. 5 is a locus diagram of the container guide roller.

In FIG. 1, the fuel transfer device of the present invention is
Mainly composed of a trolley 1, a container 2, a push cart 3, a copy rail on the fuel pool side (first tilting device) 4, a copy rail on the fuel pit side (second tilting device) 5, and a traveling rail 6. The trolley 1 with the container 2 mounted so that it can be laid down
It is connected to the push cart 3. Push cart 3
Is driven by the loop chain 9 via the drive unit 7 and the gear unit 8 as in the conventional case, and moves left and right as viewed in FIG. The traveling rail 6 is fixed to a rail base 12.

The fuel pool side profiling rail 4 is a container 2 when the carriage 1 moves to a predetermined position in the fuel pool 10.
The rear portion is arranged to be upright, and the pit side copy rail 5 is arranged to be upright in the same direction as in the fuel pool 10 when the carriage 1 is completely returned to a predetermined position in the fuel pit 11. ing.

2A and 2B show the structure in the vicinity of a portion of the traveling rail 6 on the fuel pool side. As can be seen from this figure, the copying rail 4 is a fuel pool. A support table 31 mounted on an internal structure (not shown),
32 is fixed at each end and is located on the opposite side of the traveling rail 6. That is, the support base 31 is a frame body in the shape of a right-angled triangle that is long in the horizontal direction as a whole, and has a vertical plate 31a that is a mounting portion on the apex side of the triangle. It is a triangular frame, and has a vertical plate 32a that is a mounting portion on the bottom side of the triangle. The copying rail 4 has its upper end fixed to the triangular base side of the support 31 and its lower end fixed to the triangular vertex of the support 32. The lower end bent substantially horizontally from the rail main body is the lowermost part. 17
Has become.

The container 2 is rotatably supported by a support shaft 13 near the center of the carriage 1.
A front guide roller 14 and a rear guide roller 15, which are guided portions, are provided on the sides of the front end portion and the rear end portion, respectively. The rear guide roller 15 is used when operating on the fuel pit side. Further, as can be understood from FIG. 2B, the copying rail 4 has a shape suitable for cantilever support in accordance with the shape of the front guide roller 14, and a portion corresponding to the guide roller shaft is A slit (guide path) 4a is formed including the lowermost part 17 described above.

In FIG. 2A, when the carriage 1 moves to the right and the front guide roller 14 is introduced into the rectangular opening of the introducing portion 16 of the copying rail 4, the traveling rail 6 is opened. Since the portion 20 is provided as shown in the drawing, the front guide roller 14 is allowed to move downward along the copying rail 4. Therefore, when the container 2 leans downward to the right around the support shaft 13 and the front guide roller 14 reaches the lowermost portion 17 of the copying rail 4, at this time, the support shaft 13
Is located right above the lowermost part 17 and the container 2 stands upright to the right (the shape of FIG. 1 seen from the back).

FIG. 3 shows the structure around the portion on the fuel pit side of the traveling rail, in which the truck 1 is moving to the fuel pit side together with the container 2. In FIG. 3, the copying rail 5, the support bases 33, 34, etc. are arranged in a positional relationship of being rotated by 180 ° along the traveling rail 6 with respect to the above-mentioned copying rail 4, support bases 31, 32, etc. Other than that, it may have the same structure. Therefore, the copying rail 5 is also formed with slits or slots (guide paths) 5a including the uppermost portion 19 thereof.

The dolly 1 moves to the left in FIG.
When the rear guide roller 15 enters the introducing portion 18 of the copying rail 5 as in the case of, the container 2 rises along the copying rail 5, and accordingly, the container 2 tilts to the upper left with the support shaft 13 as the center. When the rear guide roller 15 reaches the horizontally curved uppermost portion 19 from the rail main body portion, the support shaft 13 comes to be positioned directly below the uppermost portion 19, and the container 2 stands upright in the upper left direction (see FIG. 1 from the rear side). It looks like it). In the vicinity of the copying rail 5, the rail base 12 is also provided with a similar opening 20 as a container passage when the container is tilted.

Next, in FIGS. 4A to 4C, a plurality of traveling rollers 21 are rotatably provided on one side surface of the carriage 1 on the traveling rail 6 side, and these are used for traveling. It is configured to be rotatably fitted in the rail 6 and to support the trolley 1 in a cantilever manner, as can be understood from FIGS. 2 and 3. In addition, at the center of the side of the box-shaped cart 1, a container 2
Is provided with a shaft hole 22 through which the support shaft 13 (Figs. 2 and 3) is inserted and supported, and a plate having a length slightly shorter than approximately half the length of the container 2 in each of the top and bottom thereof. The members 2a and 2b are provided at opposite positions in the longitudinal direction. The plate member 2b at the bottom of the container functions as a container support plate.

On the other hand, the side surface of the carriage 1 corresponding to the front and rear guide rollers 14 and 15 of the container 2 shown in FIGS. 2 and 3 has a notch for allowing the guide rollers to escape when the container is tilted. 23 are provided, but each notch 23
In the inside, as shown in FIG.
Biasing means such as a leaf spring 25 is provided to lightly hold the shafts 24 of 15 and 15 to prevent the container 2 from rising. In addition, as shown in FIG. 4C, an auxiliary roller 27 is rotatably provided on the plate member 2b at the bottom of the carriage 1 and is supported in contact with the auxiliary rail 28 of the rail base 12, It is preferable to try to reduce the holding load.

In FIG. 5, (A) shows the case where the shape of the copying rail 4 is S-shaped, and (B) shows the case where it is linear as in the embodiment, when the front guide roller 14 enters the introducing section 16. From the container horizontal state, the front guide roller 14 is at the bottom 1
The locus | trajectory of the container 2 to the container upright state at the time of reaching 7 is shown. In the horizontal axis of the figure, S is the movement distance of the support shaft 13 or the carriage 1 in FIG. 2, the O point is the position of the introducing portion 16 of the copying rail, and the H point is the lowermost portion 17 of the copying rail 4. The vertical axis L indicates the level of the traveling rail 6.

As mentioned above, the front guide roller 14 is
During the transition of the container 2 from the horizontal state to the upright state, from the introduction portion 16 to the lowermost portion 17, that is, along the OH curve of (A) or (B) of FIG. Reach the point. As can be seen by comparing (A) and (B) of FIG. 5, in order to maintain the container 2 in a stable upright state, the amount of angular displacement at the time of starting and ending the tilting of the container 2 is small. The profile rail shape in the case of (B) is preferable.

Although the detailed structure of the push cart 3 schematically shown in FIG. 1 is not shown, it has a cantilever type traveling roller like the carriage 1, and the push cart 3 is rollably fitted on the traveling rail 6. The loop chains 9 of FIG. 1 can be driven along the traveling rails 6 in the same manner as in the conventional case. Since the push cart 3 is long, the push cart 3 may be of a split type.

[0024]

The fuel transfer device according to the present invention has the above-described structure, that is, it has the first and second raising / lowering devices for automatically raising and lowering the container in conjunction with the movement of the carriage. , A power source for raising and lowering the container is unnecessary, and the following equipment required for a conventional fuel transfer device can be eliminated, and two sets of raising and lowering devices are provided, The equipment is greatly simplified, the electric parts are reduced, the production cost is reduced, and the maintenance is also easy. 2 sets of hydraulic drive unit 2 sets of hydraulic cylinder and attached piping equipment 1 set of rail equipment for running 1 loop Chain equipment 1 set Underwater limit switch About 10

[Brief description of drawings]

FIG. 1 is a schematic diagram for explaining an overall structure of a fuel transfer device according to a preferred embodiment of the present invention.

2 (A) is a perspective view of the retracting device on the storage container side in the embodiment of FIG. 1, and FIG. 2 (B) is a sectional view taken along line 2B-2B in FIG.

FIG. 3 is a perspective view of a tilting mechanism on the fuel pit side in the embodiment of FIG.

4A is a perspective view for explaining the truck and the container as viewed from the side opposite to FIG. 2, and FIG. 4B is a perspective view of FIG.
4B and 4C are cross-sectional views taken along the line 4C-4C in FIG.

FIG. 5A is a diagram showing the trajectory of the container guide roller when the profile rail has a linear shape and FIG. 5B shows an S-shape.

FIG. 6 is an explanatory view showing the overall structure of a conventional fuel transfer device.

7 is an explanatory view of a conventional erection device in the fuel transfer device of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Bogie, 2 ... Container, 4 ... Fuel pool side copy rail (1st raising / lowering apparatus), 4a ... Slot (guide way), 5 ...
Copying rail (second tilting device) on the fuel pit side, 5a ... Slot (guide path), 6 ... Traveling rail, 13 ... Support shaft,
14 ... Front guide roller (guided portion), 15 ... Rear guide roller (guided portion), 16 ... Introducing portion (guide path), 17
… Bottom, 18… Introduction (guideway), 19… Top, 2
0 ... openings, 21 ... running rollers.

Claims (1)

[Claims] 1. A traveling rail laid substantially horizontally between the fuel pool and the fuel pit for transferring a fuel assembly between the fuel pool and the fuel pit through a fuel transfer pipe in the nuclear power plant. A trolley capable of traveling along the traveling rail between first and second predetermined positions in the fuel pool and the fuel pit; and a trolley accommodated in the trolley and rotated between a horizontal state and a vertical state. In a fuel transfer device comprising a container pivotably attached to the carriage at a substantially central portion, at both end portions of the container, a first member extending from the end portions and releasably projecting from a wall of the carriage. First and second guided parts are provided, and when the container accommodated in the trolley moves toward the first and second predetermined positions in the vicinity of the first and second predetermined positions. , The first and second cover, respectively. First and second raising / lowering devices for receiving the guide portion are provided, and the first and second raising / lowering devices connect the first and second guided portions of the container to the first and second guide portions.
The container is moved from the horizontal state to the first and second predetermined positions of the container while being guided to the first and second predetermined positions by being received by the tilting device. A fuel transfer apparatus in a nuclear power plant, comprising a guide path formed to stand upright.