JPH11190794A - New fuel inspection base - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate vertical fitting working by shortening the wait time of other working and contriving the shortness of the fitting working time of a channel box for a new fuel bundle. SOLUTION: The new fuel inspection base is provided with a main column 12 vertically provided on a base 10, a plurality of working bases 20 vertically movably set along the longitudinal direction of the main column 12, a plurality of driving means 14 independently vertically moving the working bases 20, respectively, a holding member rotatably holding a new fuel bundle 3 attached to the main column 12, a sub-column 21 vertically expandably set on the main column 12, and a jib crane 25 handling a new fuel channel fitted to the new fuel bundle rotatably set on the sub-column 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a new fuel inspection table for assembling and inspecting a fuel assembly loaded in a core of a boiling water reactor (hereinafter referred to as "WR").

[0002]

2. Description of the Related Art Conventionally, such a new fuel inspection table is shown in FIGS. 7 and 8. FIG. FIG. 7 is a front view showing a conventional new fuel inspection table, and FIG. 8 is a plan view of FIG. As shown in FIG. 7 and FIG.
A clamp arm 4 for rotatably holding two new fuel bundles 3 is attached to the upper part of the column member 2. Then, the fuel exchange floor 1 near the column member 2
A base 5 is provided thereon, and the base 5 is positioned and fixed on the fuel exchange floor 1 by a plurality of jack bolts 6.

[0003] Also, just below the clamp arm 4 on the base 5, there are provided two receiving stands 7 for rotatably supporting the two new fuel bundles 3, and these receiving stands 7 are provided with the new fuel bundles 3. And a bearing for rotating the receiving portion in a radial direction.

The platform 8 is formed in a substantially U-shape in a plane so as to surround the column member 2, and is used by an operator or an inspector to perform various operations and inspections. The platform 8 is configured to be movable up and down along the longitudinal direction of the column member 2 by a driving unit 9 as in a normal forklift. That is, the drive unit 9 includes a hydraulic pump, a hydraulic cylinder, and the like. By driving the hydraulic pump to operate the hydraulic cylinder, the support unit 9a that supports the platform 8 is moved up and down, and the platform 8 is moved up and down.

[0005] In the WR, the final assembly and inspection of the new fuel bundle 3 are performed on the refueling floor 1 in the local reactor building. The contents and procedure of the work will be described below.

First, a fuel container of a wooden box containing two new fuel bundles 3 is fixed upright on a fuel container erecting stand provided separately from the new fuel inspection stand. Next, the two new fuel bundles 3 are moved from the fuel container to the new fuel inspection table by the overhead crane, and each of the new fuel bundles 3 is mounted upright on the receiving table 7 and held by the clamp arm 4. In this operation, the platform 8 has been moved to the rising end in order to open and close the lock of the clamp arm 4, and one slinger is riding on the platform 8.

The new fuel bundle 3 is air-cleaned by an air nozzle while collecting the plastic spacer for positioning the fuel rods from the new fuel bundle 3 while rotating the new fuel bundle 3 after unpacking. Further, after inspecting the transportation of the new fuel bundle 3 for any abnormality, the channel box is moved to the new fuel bundle 3 with a manual winch fixed to the ceiling of the refueling floor 1.
And the channel box is fitted to the new fuel bundle 3 from above.

Thereafter, a channel fastener is attached to the new fuel bundle 3, and its tightening torque is managed and recorded. Next, the assembled new fuel bundle 3 is suspended by an overhead crane and moved to a fuel rack in a fuel pool attaching / detaching machine (FP #) or a new fuel storage (NFV).

Then, the whole fuel container containing two fuel bundles 3 different from the above is set up on a fuel container stand which is installed separately from the new fuel inspection table in the same manner as described above. Transfer 3 to a new fuel inspection table with an overhead crane. As described above, the unpacking, inspection, assembling, and moving are repeatedly performed with two new fuel bundles 3 as one operation unit.

[0010]

However, since the above operation is performed on the refueling floor 1 and only one platform 8 is installed, it was repeatedly processed as one operation unit with two new fuel bundles 3. In such a case, there is a problem that a waiting time for other work is generated and workability is low. Also, since the manual winch and the overhead crane interfere with each other, the channel box cannot be fitted at the same time as the new fuel bundle moving operation using the overhead crane. In addition, there is a problem that the radiation exposure dose of the worker increases.

Further, since the channel box is handled by the manual winch, there is a problem that the setup operation requires a long time and the radiation exposure of the operator increases. In addition, since the hanging position of the manual winch is fixed to the ceiling of the floor and is located at the center of the two receiving stands 7, the channel box is slightly inclined when fitting the channel box. Easy to insert into
There is a problem that the quality of the new fuel bundle 3 is reduced.

Since the platform 8 is driven up and down by a hydraulic cylinder, the oil must be replaced during regular maintenance. At that time, a large amount of waste oil is generated, and it takes time to dispose of the oil. There were challenges.

The present invention has been made in consideration of the above circumstances, and has been made to reduce the waiting time for other work and the work time for fitting a channel box to a new fuel bundle to reduce the radiation exposure of workers. It is an object of the present invention to provide a new fuel inspection table capable of reducing the amount, easily mounting a channel box vertically, and assembling a new fuel bundle of higher quality.

[0014]

Means for Solving the Problems In order to solve the above-mentioned problems, the invention of claim 1 is based on a base installed on a floor, a main pillar erected on the base, and A plurality of worktables installed to be able to move up and down along the longitudinal direction of the column,
A plurality of driving means for independently moving these worktables up and down, a holding member attached to the main column for rotatably holding the new fuel bundle, and a sub-unit mounted on the main column so as to be vertically expandable and contractible. And a jib crane rotatably mounted on the sub-post and handling a fuel channel fitted to the new fuel bundle.

According to the first aspect of the present invention, when a plurality of work benches are installed, when two new fuel bundles are repeatedly processed as one work unit, the waiting time for other work can be reduced, and Parallel inspection of two new fuel bundles becomes possible.

Further, by providing the jib crane which can be extended and contracted in the vertical direction, the operation time for fitting the channel box to the new fuel bundle can be shortened, the radiation exposure of the operator can be reduced, and the vertical position of the channel box can be reduced. The installation work becomes easier, and a higher quality new fuel bundle can be assembled.

Further, since the sub-column on which the jib crane is installed is vertically expandable and contractable with respect to the main column, it is possible to prevent interference with other overhead cranes and the like by contracting when not in use. .

According to a second aspect of the present invention, in the new fuel inspection table according to the first aspect, the plurality of driving means are electric driving devices.

According to the second aspect of the present invention, since the plurality of driving means are electric driving devices, the generation of waste during periodic maintenance can be extremely reduced, and the maintainability can be improved.

According to a third aspect of the present invention, in the new fuel inspection table according to the first aspect, a receiving base for rotatably supporting the new fuel bundle is provided on the base.

According to the third aspect of the present invention, by providing the base with the receiving base for rotatably supporting the new fuel bundle,
Handling of the new fuel bundle becomes easier.

According to a fourth aspect of the present invention, in the new fuel inspection table of the first aspect, the base is fixed by a plurality of fixing members previously set on the floor.

According to the fourth aspect of the present invention, in the new fuel inspection table according to the first aspect, the base is fixed by a plurality of fixing members installed on the floor in advance, so that the new fuel has high stability. An inspection table can be provided.

[0024]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view showing an embodiment of a new fuel inspection table according to the present invention, FIG. 2 is a partial sectional side view of FIG.
1 is a plan view of FIG. 1, FIG. 4 is a sectional view taken along line AA in FIG.
FIG. 5 is a sectional view taken along the line BB in FIG. 1, and FIG. 6 is a plan view showing the clamp arm of FIG. In FIGS. 1 to 5, the fuel exchange floor and the new fuel bundle will be described with the same reference numerals as in FIG.

As shown in FIGS. 1 to 5, the base 10 has a plurality of casters (not shown) mounted on the bottom surface and is fixed by fixing claws 11 as fixing members previously installed on the fuel exchange floor 1. You. A main pillar 12 formed in a rectangular tube shape is erected on the base 10, and two rails 13 are fixed parallel to each other along the longitudinal direction of the main pillar 12.

On the base 10, two electric driving devices 14 are installed, and two receiving stands 15 for rotatably supporting the new fuel bundle 3 are installed. These pedestals 15 include a receiving portion into which the lower end of the new fuel bundle 3 is inserted, and a bearing for rotating the receiving portion in the radial direction.

Further, on the base 10, two ball screw shafts 16 which are rotated by driving two electric driving devices 14 as driving means are provided upright along the longitudinal direction of the main column 12. Here, the electric drive device 14 and the ball screw shaft 1
6, an operation connecting means (not shown) such as a gear is interposed. A support plate 17 fixed to the main column 12 is attached to the upper end of each ball screw shaft 16, and the ball screw shaft 16 is rotatably held by the support plate 17.

A ball nut 18 is screwed onto each of the ball screw shafts 16, and the ball nut 18 converts the rotational motion of each of the ball screw shafts 16 into a vertical motion. Nuts 18 are respectively fixed to the moving supports 19. Each moving support 19
Is fixedly supporting a platform 20 as a work table on which a worker or an inspector boards to perform various operations and inspections, and a rolling means such as a roller is interposed between the platform 20 and each rail 13. It moves up and down along the rail 13.

Therefore, by driving the electric driving device 14, the ball screw shaft 1 is connected via the operation connecting means.
The ball nut 18 is moved upward or downward by the rotation of the ball screw shaft 16. When the ball nut 18 moves up and down, the moving support 19 moves up and down along the rail 13, thereby moving the platform 20 either upward or downward.

Inside the main column 12, a sub column 21 which can be moved up and down by being guided by the inner surface in the longitudinal direction of the main column 12,
And a ball screw shaft 22 shown in FIG. The ball screw shaft 22 is rotated by an electric driving device 23 installed on the base 10 via an operation connecting means. And, on the ball screw shaft 22,
The ball nut 24 is screwed, and the ball nut 24 is fixed to the sub column 21.

Therefore, by driving the electric driving device 23, the ball screw shaft 2 is driven via the operation connecting means.
2 rotates, and the rotation of the ball screw shaft 22 moves the ball nut 24 upward or downward. When the ball nut 24 moves up and down, the
Moves upward or downward, and the sub pillar 21 expands and contracts with respect to the main pillar 12 in the vertical direction.

A jib crane 25 is provided above the sub-post 21 for handling a channel box (fuel channel) rotatable with respect to the sub-post 21 and fitted to the new fuel bundle 3. The jib crane 25 is a boom. And a rope 2 attached to the tip of the boom 26.
By operating 7, the boom 14 can be turned. The jib crane 25 is provided with a hoist 28 that can travel from the base end to the tip end along the longitudinal direction of the boom 26.

A clamp arm 29 as a holding member for holding the two new fuel bundles 3 is attached to the upper part of the main pillar 12, and this clamp arm 29 has two opening / closing portions 30 as shown in FIG. A guide plate (not shown) for supporting the new fuel bundle 3 in a rotatable manner is fitted in the clamp arm 29 by cutting out the center of the disk and being rotatably supported by the pins 31.

That is, the guide plate is rotatably mounted in the clamp arm 29, and a hole having the same shape as the outer shape of the new fuel bundle 3 is formed in the center of the guide plate. When the new fuel bundle 3 is inserted into this hole and the guide plate is mounted on the clamp arm 29, the clamp arm 29 holds the new fuel bundle 3 rotatably.

The platform 20 has a work lighting device 32 and an operation panel 33 for operating each device.
(Shown in FIG. 2).

Next, the operation of the above embodiment will be described.

In the WR, the final assembly and inspection of the new fuel bundle 3 are performed on the refueling floor 1 in the on-site reactor building, and the contents and procedure of the operation will be described below. In the present embodiment, the inspection of the two new fuel bundles 3 and various operations are separately performed on the two platforms 20.

As in the prior art, first, a wooden box fuel container containing two new fuel bundles 3 is stood and fixed on a fuel container erecting stand installed separately from the new fuel inspection stand. Next, the two new fuel bundles 3 are moved from the fuel container to the new fuel inspection table by the overhead crane, and the new fuel bundles 3 are respectively mounted upright on the receiving table 15 and held by the clamp arms 29. In this work, in order to open and close the opening / closing section 30 of the clamp arm 29,
The platform 20 has been moved to the rising end, and one slinger is boarding the platform 20.

The new fuel bundle 3 is air-cleaned by an air nozzle while collecting the plastic spacer for positioning the fuel rods from the new fuel bundle 3 while rotating the new fuel bundle 3 after unpacking. Further, after inspecting the transportation of the new fuel bundle 3 for abnormalities, the channel box is lifted coaxially with the new fuel bundle 3 by the jib crane 25, and the channel box is fitted to the new fuel bundle 3 from above. .
In this case, the above-mentioned guide plate is reset in the direction for the channel box.

Here, the channel box lifted by the jib crane 25 is used by one worker to prepare a new fuel bundle 3.
While supporting the upper part, another worker gently lowers and fits the lower end of the channel box while aligning the core by hand. When the rope of the hoist 28 is loosened by hanging down, the channel box is pushed by hand until the clip of the channel box is in close contact with the corner post of the upper tie plate.

Thereafter, a channel fastener is attached to the new fuel bundle 3, and its tightening torque is managed and recorded. After confirming the channel fastener marking and lubrication application, one person presses the upper tie plate of the new fuel bundle to stop rotation, and the other person tightens the cap screw with a torque wrench to an acceptable value and inspects. A member reads and records the tightening torque.

Further, the guide plate is removed from the clamp arm 29, and the assembled new fuel bundle 3 is suspended by the jib crane 25 and moved to the fuel channel attaching / detaching machine or the storage rack in the new fuel storage.

Then, the whole fuel container containing two fuel bundles 3 is set on the fuel container stand which is installed separately from the new fuel inspection table, and the new fuel bundle 3 is then moved to the overhead crane. Transfer to a new fuel inspection table. As described above, the unpacking, inspection, assembling, and moving are repeatedly performed with two new fuel bundles 3 as one operation unit.

As described above, according to this embodiment, when two platforms 20 are installed, when two new fuel bundles 3 are repeatedly processed as one operation unit, the waiting time for other operations can be reduced. In addition, the parallel inspection of the two new fuel bundles 3 becomes possible.

Also, a jib crane 2 capable of extending and contracting vertically.
By providing the fuel cell 5, the work time for fitting the channel box to the new fuel bundle 3 can be reduced, the radiation exposure of the operator can be reduced, and the work of vertically mounting the channel box can be easily performed. Quality New Fuel Bundle 3
Can be assembled.

Since the sub-column 21 on which the jib crane 25 is installed is vertically expandable and contractible with respect to the main column 12, it is contracted when not in use to prevent interference with other overhead cranes and the like. be able to.

Further, since the platform 20 is driven up and down by the electric drive unit 14, the generation of waste during regular maintenance can be extremely reduced, and the maintainability can be improved.

Then, the base 10 is fixed by a plurality of fixing claws 11 previously set on the fuel exchange floor 1, so that a new fuel inspection table with high stability can be provided.

The present invention can be variously modified without being limited to the above embodiment. For example, although the overhead crane is used to move the two new fuel bundles 3 from the fuel container to the new fuel inspection table, the jib crane 25 may be used. Further, in the above embodiment, two platforms 20 are installed, but more than two platforms 20 may be installed.

[0051]

As described above, according to the present invention,
By installing a plurality of work benches, the waiting time for other work can be shortened, and the parallel inspection of two new fuel bundles becomes possible.

Further, according to the present invention, by providing the jib crane which can be extended and contracted in the vertical direction, the work time for fitting the channel box to the new fuel bundle can be shortened, and the radiation exposure of the operator can be reduced. However, the vertical mounting operation of the channel box is facilitated, and a higher-quality new fuel bundle can be assembled.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a new fuel inspection platform according to the present invention.

FIG. 2 is a partial cross-sectional side view of FIG.

FIG. 3 is a plan view of FIG. 1;

FIG. 4 is a sectional view taken along line AA in FIG. 1;

FIG. 5 is a sectional view taken along line BB in FIG. 1;

FIG. 6 is a plan view showing the clamp arm of FIG. 1;

FIG. 7 is a front view showing a conventional new fuel inspection table.

FIG. 8 is a plan view of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refueling floor 3 New fuel bundle 10 Base 11 Fixed claw (fixing member) 12 Main pillar 13 Rail 14 Electric drive device (Drive means) 15 Cradle 16 Ball screw shaft 17 Support plate 18 Ball nut 19 Moving support 20 Platform (Working table) 21 Secondary pillar 22 Ball screw shaft 23 Electric drive 24 Ball nut 25 Jib crane 26 Boom 27 Rope 28 Hoist 29 Clamp arm (holding member) 30 Opening / closing part 31 Pin 32 Lighting device 33 Operation panel

Claims (4)

[Claims] 1. A base installed on a floor, a main column erected on the base, and a plurality of work tables installed movably up and down along a longitudinal direction of the main column. A plurality of driving means for vertically moving each of these worktables independently,
A holding member attached to the main column for rotatably holding the new fuel bundle; a sub-column mounted on the main column so as to be able to expand and contract in the vertical direction; and a rotatable member mounted on the sub-column and fitted to the new fuel bundle. A new fuel inspection table, which is equipped with a jib crane that handles a fuel channel to be received. 2. The new fuel inspection platform according to claim 1,
A new fuel inspection stand, wherein the plurality of driving means are electric driving devices. 3. The new fuel inspection platform according to claim 1, wherein:
A new fuel inspection bench, wherein a base for rotatably supporting a new fuel bundle is provided on a base. 4. The new fuel inspection stand according to claim 1,
A new fuel inspection stand, wherein the base is fixed by a plurality of fixing members previously set on the floor.