JPH10332874A - Fresh fuel inspection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fresh fuel inspection device provided with a hoist of extension type mast for fuel fixing type or a load support mechanism at the lower part for fuel moving type and provided with a guiding device, a holding device, etc., for fresh fuel and channel boxes which is made possible to move by self-running and the like. SOLUTION: In a fuel fixing type fresh fuel inspection device 19 inspecting reactor fresh fuel assembly and loading a channel box, a main column 22 supporting a fresh fuel assembly 8 is placed vertically on a base 21 having a fixing device 20 along the side surface, a jib crane 14 is placed on a mast 29 at the top and lifts 27a and 27b for inspection freely movable up and down are provided to the main column side 22 for each fuel assembly 8.

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 apparatus for inspecting a new fuel used in a nuclear power plant and mounting a channel box.

[0002]

2. Description of the Related Art Taking a boiling water reactor as an example of nuclear fuel used in a nuclear power plant, a new fuel is transported into a reactor building with a long fuel body without a channel box, and the nuclear fuel is removed. Before loading into the furnace, various inspections and inspections are performed, and a channel box is mounted to assemble the fuel assembly. A new fuel inspection device is used to perform the new fuel inspection and the like.

As shown in a plan view of FIG. 7, a fuel handling floor 2 of a reactor building 1 in which a nuclear reactor is installed in a nuclear power plant.
A reactor well 3 is provided at an upper part of a reactor located substantially in the center, and a fuel pool 4 and an in-reactor equipment storage pit 5 are constructed in communication with the reactor well 3.
The conventional new fuel inspection device 6 is installed and fixed in the vicinity of the fuel pool 4. The new fuel inspection device 6 has a fixed fuel type and a fuel transfer type depending on how to handle a new fuel body at the time of inspection. There is an expression.

In the fixed fuel type, the position of a new fuel body mounted on a new fuel inspection device is fixed, and an inspector or the like rides on an inspection lift that moves arbitrarily up and down. , The entire length of the new fuel body is to be inspected,
8A is a front view, FIG. 8B is a side view, and FIG. 8C is a plan view.

[0005] A fixed fuel type new fuel inspection device 7 is provided on a fuel handling floor 2, and has a fuel support column 9 for holding a substantially prism-shaped new fuel body 8 on both sides in an upright position, and a periphery of the fuel support column 9. The inspection lifter 10 is provided with a worker and an inspector and can move up and down, and a lifter driving device 11 for arbitrarily driving the inspection lifter 10.

In this fuel-fixed type new fuel inspection apparatus 7, an operator and an inspector apply an inspection lifter 10 to two new fuel bodies 8 mounted vertically while being held by the fuel support columns 9.
With the inspection lifter 10 on board,
According to 11, the new fuel body 8 is moved up and down to perform inspection and inspection.

[0007] In the case of the fuel transfer type, a new fuel inspection device is installed in an inspection pit, and a new fuel body is moved up and down arbitrarily. 9 (a) is a front view, FIG. 9 (b) is a side view, and FIG. 9 (c) is a plan view.

[0008] The fuel-moving new fuel inspection device 12 is installed and fixed at the bottom of an inspection pit 13 constructed at a depth substantially exceeding the length of the new fuel body 8 on the fuel handling floor 2, and a channel box is provided at the top. A long movable table support column 15 is provided, to which a jib crane 14 as a lifting crane is attached.

On both sides of the movable table support column 15, movable tables 16a and 16b which are vertically movable are attached.
A new fuel body 8 is mounted upright on 16a and 16b,
A movable table driving device 17 for vertically moving the movable tables 16a and 16b
a and 17b. The new fuel assembly 8 is placed at the same level as the fuel handling floor 2 above the inspection pit 13.
And an inspection floor 18 having a shape in which a movable support support column 15 is opened.

In this fuel movable type new fuel inspection apparatus 12, movable tables 16a and 16b on which the new fuel body 8 is mounted are arbitrarily moved up and down along movable table supporting columns 15 by movable table driving devices 17a and 17b. On the fuel handling floor 2 and the inspection floor 18, inspection and inspection of the new fuel body 8 are performed by workers and inspectors.

The procedure for loading and inspecting new fuel in a nuclear power plant will now be described with reference to the fixed fuel type new fuel inspection device 7 shown in FIG. 8 as an example. The new fuel body 8 carried into the fuel handling floor 2 of the reactor building 1 by a dedicated fuel container is:
It is transferred to the installation place of the fuel fixed type new fuel inspection device 7,
It is mounted upright along the fuel support column 9 by an overhead crane (not shown) which is a facility of the reactor building 1.

Thereafter, the worker and the inspector get on the inspection lifter 10 and arbitrarily move the inspection lifter 10 up and down by the lifter driving device 11 so that the worker can protect the transport protection material on the new fuel body 8. Removal and cleaning, and inspection by the inspector over the entire length. After the cleaning and inspection are completed, a square tubular channel box (not shown) is attached to the periphery of the new fuel body 8 from above and the upper corner is fixed with a channel fastener, so that the fresh fuel to be loaded into the reactor is The state is a new fuel assembly.

[0013]

A series of operations in the new fuel inspection apparatus for the new fuel body 8 are operations in the vicinity of the reactor, and the inspection is performed because the new fuel body 8 is long and has a large number of processing bodies. , It takes a lot of time for the worker and the inspector, and the exposure is likely to increase.

Further, the fixed fuel type new fuel inspection device 7 does not include a hoist for lifting a channel box mounted on the new fuel body 8 after the inspection is completed.
The overhead crane of the lifting machine installed on the ceiling of the reactor building 1 is used for mounting the channel box on the new fuel body 8 after the inspection because the lifting height of the long channel box is insufficient. Can not do.

Therefore, it is necessary to install a lifting machine exclusively for mounting the channel box, located above the overhead crane provided on the ceiling of the reactor building 1.
However, when lifting the channel box using this dedicated lifting machine, always interfere with the overhead crane installed on the ceiling of the reactor building 1,
There is a problem that the work efficiency is lowered because it is necessary to avoid the problem.

On the other hand, in the fuel-transportable new fuel inspection apparatus 12 shown in FIG. 9, the whole length of the new fuel body 8 extends above and below the fuel handling floor 2 and moves up and down by the entire length. The height above the floor 2 may be approximately the entire length of the new fuel body 8. Thus, when mounting the channel box, there is almost no interference with the overhead crane, and the work can be performed by the jib crane 14 of the lifting machine attached to the top of the movable base support column 15.

However, the fuel-moving new fuel inspection device
For the use of 12, it is necessary to construct the inspection pit 13 having the predetermined depth from the beginning of the construction of the reactor building 1, and the conventional fixed fuel type new fuel inspection device 7 has been used. At the nuclear power plant, since a dedicated inspection pit 13 was not installed in the reactor building 1, it was impossible to switch to the fuel-injection type new fuel inspection device 12 at a later date.

Further, the work in the reactor building 1 is performed by an operator in all the work such as mounting or taking out the new fuel body 8 to the new fuel inspection device, and mounting the channel box to the new nuclear fuel 8. It is necessary to manually guide the user to a predetermined position and perform the check while confirming the operation. Further, as shown in FIG. 7, the installation position of the new fuel inspection device 6 is fixedly provided at a part of the fuel handling floor 2 in the reactor building 1 or at a place where the inspection pit 13 is constructed. I have.

However, these installation locations are generally located in a narrow place at the time of periodic inspection of the nuclear power plant, because it is necessary to secure a temporary storage space for the equipment on the fuel handling floor 2. The lack of space has prevented improved workability in new fuel inspections.

The object of the present invention is to provide a telescopic mast hoist for a fixed fuel type and a load support mechanism at the bottom for a fuel transfer type to provide a guide device, a holding device and a channel for a new fuel and channel box. It is an object of the present invention to provide a new fuel inspection device that includes a box mounting device and enables movement such as self-propelled movement.

[0021]

According to a first aspect of the present invention, there is provided a new fuel inspection apparatus for inspecting a new reactor body and installing a channel box in a new fuel inspection apparatus. A main column for holding fuel bodies and the like is set upright on a base provided with side surfaces, and a lifting machine is provided on a telescopic mast at the top, and the main body is vertically movable on a side portion of the main column for each fuel body. The inspection lift is provided.

The new fuel assembly is moved to a predetermined position where the new fuel assembly is to be inspected, and the new fuel inspection system is fixed by the fixing device, and the fuel assembly lifted by a hoist on a telescopic mast is mounted along the main column. With respect to the fuel body fixed at the mounting position, an operator and an inspector who are on an inspection lift for each fuel body move up and down to perform inspection and inspection of the fuel body. Further, a channel box hung by a hoist or the like on the telescopic mast is attached to the fuel body after the inspection, and then removed from the new fuel inspection apparatus.

According to a second aspect of the present invention, there is provided a new fuel inspection apparatus according to the first aspect, wherein the hoist provided on the telescopic mast at the top of the main pillar reduces the telescopic mast when approaching another hoist. The hoist is controlled by synchronous operation.

During the work of lifting a fuel body or the like by the lifting machine provided on the extended telescopic mast and mounting it on the new fuel inspection device, if another lifting machine approaches this lifting machine, the length of the telescopic mast is reduced. The hoisting operation of the hoist is controlled synchronously. As a result, the height of the hoist of the new fuel inspection device is reduced without changing the position of the lifted new fuel and the like, so that this hoist does not interfere with the other hoist approaching, and The position of the new fuel, etc., suspended by heavy equipment has moved,
The new fuel or the like is prevented from being damaged by interference with the surroundings.

According to a third aspect of the present invention, there is provided a new fuel inspection apparatus for inspecting a new reactor body and installing a channel box, wherein a main pillar is installed upright on a base provided with a fixing device. In addition, a lifting machine is provided at the top, and a movable base on which a fuel body and the like are mounted is provided movably up and down, provided with a guide rail and a load supporting mechanism that moves up and down on the side of the main column.

The new fuel body is moved to a predetermined position on the pit where the new fuel body is to be inspected, and the new fuel inspection device is fixed by the fixing device, and the load support mechanism is lowered so that the lower end abuts on the pit bottom to support the new fuel inspection device. I do. A fuel body lifted by an external lifting machine or the like is mounted on a movable table, and the movable table is moved up and down by the main column and a guide rail of a load support mechanism. Conduct inspections and inspections of fuel assemblies.

After the inspection, the movable base is lowered to the load support mechanism in the pit, and a channel box lifted by a hoist provided on the top of the main pillar is attached to the fuel body. After raising the movable platform, remove it from the new fuel inspection device.

According to a fourth aspect of the present invention, there is provided a new fuel inspection apparatus according to the third aspect, wherein the load supporting mechanism formed with the guide rail of the movable base has a lower end abutting against a bottom of a pit at an installation location. It is characterized by supporting. The load support mechanism, in which the movable base on which the fuel assembly is mounted is moved up and down by the guide rails, like the main pillar, has its lower end abutting on the bottom of the pit, and the channel mounted on the fuel assembly together with the movable base The load of the box is transmitted to the bottom of the pit, and the load on the base is reduced.

According to a fifth aspect of the present invention, there is provided a new fuel inspection apparatus according to any one of the first to fourth aspects, wherein a guide device for guiding a fuel body or the like to a predetermined position on an upright main pillar or a movable base; A channel box mounting device for fixing a channel box, a fuel holding device for holding a fuel body or the like around an axis, and a fuel clamp device for holding a fuel body or the like rotatably around the axis are provided.

A fuel body and a channel box lifted by a hoist and mounted on a main pillar or a movable base are guided to an appropriate position by a guide device, and are rotated while maintaining a shaft center by a fuel holding device and a fuel clamp device. It is held freely.
Further, the channel box mounted on the fuel body is brought into close contact with the fuel body by pressing down the channel box mounting device, and is fixed with a fixing bolt.

According to a sixth aspect of the present invention, there is provided a new fuel inspection apparatus according to the fifth aspect, wherein the guide device for guiding a fuel body or the like provided on the main pillar or the movable base is guided inward at a lower portion of the flared guide bar. A roller is provided.
A fuel body or a channel box suspended by a hoist or the like and mounted on a main pillar or a movable base is first oriented by a flared guide bar of a guide device, and then guided to a predetermined mounting position by a guide roller.

According to a seventh aspect of the present invention, there is provided a new fuel inspection apparatus according to the fifth aspect, wherein the channel box mounting device rotatably provided on the main column or the movable base comprises a vertically moving channel box pressing portion and its channel. And a channel fastener attaching / detaching mechanism provided at a tip of the box pressing portion.

Although there is a slight gap between the fuel box and the upper part of the channel box which is suspended by a hoist and mounted on the fuel body, the upper end of the channel box is pressed by the channel box pressing portion of the channel box mounting device. By pressing down, the upper end of the channel box and the upper end of the fuel body come into close contact. Furthermore, the channel box is fixed to the fuel body by arranging the channel fastener at the upper end of the channel box and tightening the fixing bolt by the channel fastener attaching / detaching mechanism.

According to an eighth aspect of the invention, there is provided a new fuel inspection apparatus according to the fifth aspect, wherein the fuel holding device rotatably provided on the main pillar or the movable base has a variable square hole into which a fuel body or the like is inserted in the center. A fuel holding plate provided with a roller and having a peripheral roller, a fuel holding plate clamping mechanism and a fuel holding plate moving mechanism for rotatably holding the fuel holding plate in a detachable and vertically movable manner. Features.

The fuel body and the channel box inserted into the variable square holes of the fuel holding plate and held by the fuel holding plate clamp mechanism of the fuel holding device are pivoted around the shaft by rotating the fuel holding plate. Will be maintained. The fuel holding plate is moved from the fuel holding plate clamp mechanism to the fuel clamp device by the fuel holding plate moving mechanism while the fuel body and the channel box are maintained around the axis.

According to a ninth aspect of the present invention, there is provided a new fuel inspection apparatus according to the fifth aspect, wherein the fuel clamp device provided on the main pillar or the movable base is a two-part annular clamp for holding a fuel body or the like around an axis. It is characterized by comprising an arm and an opening and closing device for opening and closing the clamp arm.

The clamp arm of the fuel clamp device is opened and closed by the operation of the opening and closing device to maintain the mounted fuel body and the channel box substantially at the center of the axis and to rotate the fuel via a fuel holding plate rotatable by rollers. Hold the body and the channel box around the axis.

According to a tenth aspect of the present invention, there is provided a new fuel inspection apparatus according to the first or third aspect, wherein the fixing device provided on the base has a built-in self-propelling mechanism to enable self-propelled movement. Features. By operating the self-propelled mechanism incorporated in the fixing device provided on the base, the new fuel inspection device can be moved to a predetermined installation location or storage location by self-propelled operation.

According to the eleventh aspect of the present invention, there is provided a new fuel inspection apparatus according to the second and fifth aspects, wherein the lifting and lowering mast provided on the expansion and contraction mast and the hoist are synchronously operated and a channel is provided on the main pillar. The box mounting device, the fuel holding device, and the fuel clamping device are automatically activated by signals from proximity sensors incorporated therein.

When another hoist approaches during the operation of the hoist provided on the telescopic mast, the shortening of the telescopic mast and the hoisting operation of the hoist are performed in synchronism with a warning signal of a built-in proximity sensor. This automatically prevents interference with other lifting machines.

Further, the operation of mounting the channel box on the fuel body by the channel box mounting device is automatically performed by the signal of the proximity sensor. Further, the operation of the fuel holding device and the fuel clamp device to maintain the fuel body and the channel box at predetermined positions around the axis and rotatably holds the fuel body and the channel box automatically by the signal of the proximity sensor.

According to a twelfth aspect of the present invention, there is provided a new fuel inspection apparatus according to the fourth and fifth aspects, wherein a load support mechanism provided on the main column and a channel box mounting device provided on the movable base, a fuel holding device, The fuel clamp device is automatically activated by a signal from a proximity sensor incorporated therein.

The load supporting mechanism provided on the main column automatically performs the downward movement with respect to the bottom of the installed pit and the support of the lower end in accordance with a signal from the proximity sensor. In addition, the mounting operation of the channel box to the fuel body by the channel box mounting device is automatically performed by the signal of the proximity sensor. Further, the operation of the fuel holding device and the fuel clamp device to maintain the fuel body and the channel box at predetermined positions around the axis and rotatably holds the fuel body and the channel box automatically by the signal of the proximity sensor.

[0044]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. Note that the same components as those of the above-described related art are denoted by the same reference numerals, and detailed description thereof will be omitted. The first embodiment relates to claims 1, 2 and 5 to 11, and as shown in the front view of FIG. 1A and the plan view of FIG. The device 19 can be transported by a lifting machine or the like, and has a base 21 provided with a fixing device 20 for fixing at the installation location at the four corners at the bottom.
And a new fuel body 8 having a substantially prismatic shape on both sides of the base 21.
A main column 22 for mounting the fuel cell vertically is installed on both sides of an upper portion of the main column 22, and guide devices 23a and 23b for guiding the positioning of the new fuel body 8 and a channel box (not shown) from above. And channel box mounting devices 24a, 24 for mounting the channel box to the new fuel body 8.
b is provided.

Further, there are provided fuel holding devices 25a and 25b for maintaining each new fuel body 8 around the axis, and fuel clamping devices 26a and 26b for rotatably holding each new fuel body 8 around the axis. . The channel box mounting device 24
a, 24b and the fuel holding devices 25a, 25b are provided rotatably at the storage position of the main column 22 (claim 5).

Further, on the outer periphery of the main pillar 22, two divided inspection lifters 27a, on which an operator and an inspector are mounted, for individually inspecting and handling the two new fuel bodies 8 mounted thereon,
27b and lifter driving devices 28a and 28b for arbitrarily moving the inspection lifters 27a and 27b up and down.

Further, a jib crane 14 serving as a lifting machine for lifting a channel box or the like mounted on the new fuel body 8 is provided above the main column 22 at the upper end of a telescopic mast 29 which is telescopic. (Claim 1). By providing a self-propelled mechanism including wheels and a drive unit (not shown) in the fixing device 20, the fuel-fixed new fuel inspection device 19 can be self-propelled, moved to a predetermined location, and fixed. Ten).

The guide devices 23a and 23b are shown in FIG.
As shown in the front view of FIG. 1 and the plan view of FIG. 2B, one guide device 23a is formed of a guide bar 31 having a trumpet shape opened at the top and provided with a guide roller 30 inside the lower portion. In addition, the channel box is made of a smooth surface shape and material without damaging the surface.

Therefore, the guide devices 23a and 23b are used to mount the new fuel body 8 and the channel box along the main column 22 when the channel box mounting devices 24a and 23b are mounted.
Insertion guidance is performed for 24b, the fuel holding devices 24a and 24b, and the fuel clamp holding devices 25a and 25 (claim 6).

The channel box mounting devices 24a, 24
FIG. 3B shows one channel box mounting device 24a in the front view of FIG. 3A and the enlarged sectional view of the main part of FIG.
For example, it is configured by a channel box pressing portion 34 that moves up and down by being driven by an air piston 32 and presses a channel box 33 mounted on the outer periphery of the new fuel body 8, and a channel fastener attaching / detaching mechanism 35 built in the tip thereof. .

The channel fastener attaching / detaching mechanism 35 includes:
A built-in proximity sensor (not shown) confirms that the channel box 33 has been mounted on the new fuel body 8, and is disposed at the upper end of the channel box 34 with a bolt attaching / detaching portion 35 a. , New fuel assembly 8 with channel box 33 and channel fasteners
36 is fixed (claims 7 and 11).

The fuel holding devices 25a and 25b are shown in FIG.
One fuel holding device is shown in the front view of (a) and the plan view of (b).
As shown in FIG. 25a, the fuel holding plate 38 has a disk-like shape in which the new fuel body 8 and the channel box 33 are inserted in the center, and a variable square hole 39 in which the size of the square hole changes by rotating is provided. Then, it is rotatably engaged with the fuel clamp device 26a by a roller 38a provided on the periphery.

The fuel holding plate 38 is rotatably and detachably attached to a fuel holding plate clamp mechanism 40. The fuel holding plate clamp mechanism 40 is pivoted to a storage position by a fuel holding plate moving mechanism 41. When,
It is configured so that it can be moved up and down.

The fuel holding plate moving mechanism 41
Is confirmed by a built-in proximity sensor (not shown) that the new fuel body 8 and the channel box 33 are inserted into the variable square holes 39 of the fuel holding plate 38 by the fuel holding plate clamp mechanism 40 and maintained at the center of the shaft. The fuel holding plate 38 in that state is connected to the fuel clamp devices 26a and 26b.
(Claims 8 and 11).

The fuel clamp devices 26a and 26b are shown in FIG.
As shown in the front view of (a) and the plan view of (b), one fuel clamp device 23a is opened and closed by an opening / closing device 42.
And an annular clamp arm 43 which is divided.

The fuel clamp devices 26a and 26b hold the new fuel body 8 along the main column 22 substantially at the center of the axis by a clamp arm 43 closed by an opening / closing device 42, and use a built-in proximity sensor (not shown). On the condition that the new fuel body 8 does not interfere with the clamp arm 43, it is confirmed that the new fuel body 8 is arranged at a predetermined position (the center position of the closed clamp arm 43).

Further, the fuel holding plate 38 moved from the fuel holding devices 25a and 25b is rotatably held around the shaft together with the new fuel body 8 via the roller 38a (claims 9 and 11).

Next, the operation of the above configuration will be described. When inspecting the new fuel assembly 8, first, the fixed fuel type new fuel inspection device 19 stored in the storage location is replaced with an overhead crane (not shown) installed in the reactor building 1 at the inspection work location of the reactor building 1. And fixed to the fuel handling floor 2 by the fixing device 20. At this time, the fixing device
If the vehicle 20 has a self-propelled mechanism, the fixed new fuel inspection device 19 is self-propelled and moved to a predetermined location on the fuel handling floor 2 without using a hoist.

Next, the new fuel body 8 is lifted by the overhead crane and mounted on the fixed fuel type new fuel inspection device 19. At this time, the number of the new fuel bodies 8 collected by the overhead crane is temporarily once. After being conveyed to the vicinity of the fuel inspection device 19, the telescopic mast 29 provided on the main column 22 may be extended and mounted on the fixed fuel type new fuel inspection device 19 by the jib crane 14 as a lifting machine.

At this time, the overhead crane and the jib crane 14
The work efficiency is improved by coordinating the work with the jib crane.If the overhead crane approaches the jib crane 14 during this work, a warning signal is issued by the proximity sensor of the jib crane 14, the telescopic mast 29 is shortened, and the jib crane is shortened.
The synchronous operation control of the hoisting of 14 is performed, and the jib crane 14 is lowered without the new fuel body 8 being damaged.
Interference between the overhead crane and the jib crane 14 can be avoided.

When the new fuel assembly 8 is mounted, the channel box mounting devices 24a and 24b and the fuel holding devices 25a and 25b are initially mounted.
b is rotated approximately 90 degrees to the storage position,
The clamp arms 43 of the fuel clamp devices 26a and 26b are opened so that the new fuel body 8 can be easily mounted.

The new fuel body 8 is hung down along the main column 22. At this time, the lower end of the new fuel body 8 is
By inserting the lower end of the new fuel body 8 into the guide bar 31 by inserting it into the guide bar 31 at a and 23b,
Since the surroundings are guided by the guide roller 30, the lower end is provided on the receiving base 21a provided on the base 21 as the new fuel body 8 is suspended.
To land.

When the new fuel body 8 is guided by the guide devices 23a and 23b and lands on the pedestal 21, the fuel clamp device is provided by a signal from a proximity sensor (not shown) provided on the pedestal 21a.
26a and 26b drive the opening / closing device 42 to close the clamp arm 43 from left and right. As a result, the new fuel body 8 is held substantially at the center of the predetermined position along the main column 22, and the periphery of the new fuel body 8 interferes with the clamp arm 43 by, for example, a proximity sensor built in the clamp arm 43. Therefore, it is confirmed that it is arranged at a predetermined position (the center position of the closed clamp arm 43).

When it is confirmed that the new fuel body 8 is at the predetermined position, the fuel holding devices 25a and 25b rotate the fuel holding plate clamp mechanism 40 by about 90 degrees by the fuel holding plate moving mechanism 41. Then, it is moved from the storage position to the upper portion of the new fuel body 8 held by the clamp arm 43 of the fuel clamp device 26a, 26b. Worker is a lifter drive
The operator lifts the inspection lifters 27a and 27b on board together with the inspector by operating 28a and 28b, and rotates the fuel holding plate 38 of the fuel holding plate clamp mechanism 40 so that the variable square hole 39 is inserted into the new fuel body 8. Match with the outer circumference.

It should be noted that a proximity sensor is built in the fuel holding plate clamp mechanism 40 and a variable square hole 39 is provided by the proximity sensor.
By automatically checking the coincidence with the new fuel body 8 of
The worker lifts the inspection lifters 27a and 27b and turns the fuel holding plate 38 to change the variable square holes.
The work of matching the 39 with the outer periphery of the new fuel body 8 can be omitted.

Next, the fuel holding plate clamp mechanism 40 is lowered by the fuel holding plate moving mechanism 41 to insert the variable square hole 39 of the fuel holding plate 38 into the new fuel body 8 and further rotated to change the variable square hole 39. To maintain the new fuel body 8 at the center of the axis. When the new fuel body 8 is maintained at the center of the axis, the fuel holding plate clamp mechanism 40 operates according to the signal of the proximity sensor.
The engagement with the fuel holding plate 38 is released and the fuel holding plate 38 is separated.

As a result, the lower portion of the new fuel body 8 is the pedestal 21a of the base 21 and the upper portion is maintained at the axial center by the fuel holding plate 38. It is rotatably held through.

Next, the cleaning and inspection of the two new fuel assemblies 8 mounted on the fixed fuel type new fuel inspection system 19 of FIG. 1 are separately and arbitrarily performed by the respective lifter driving devices 28a and 28b. Lifters 27a, 27 that can be moved up and down
An operator and an inspector board the vehicle b, and rotate the new fuel body 8 about the axis. This inspection and the like are individually performed for the entire length and the entire circumference of the new fuel body 8.
Since a and 27b are provided exclusively for the two new fuel bodies 8, efficient work can be performed in a short time.

When various inspections for the new fuel body 8 are completed, the channel box 33 is mounted on the new fuel body 8.
The channel box 33 uses the jib crane 14 and the telescopic mast 29 to be mounted from above the new fuel body 8. This telescopic mast 29 is a new fuel inspection system with a fixed fuel
By shortening when transporting 19, the fuel fixed type new fuel inspection device 19 can be lowered to improve handling, but it can be easily extended during work to secure a sufficient head as a lifting machine .

Further, when the telescopic mast 29 is fully extended, interference with the overhead crane installed in the reactor building 1 is avoided. That is, if the overhead crane approaches during the operation of the jib crane 14 when the telescopic mast 29 is at the maximum extension, the proximity crane provided on the jib crane 14 detects this and issues an alarm signal,
29 is automatically shortened to the interference avoidance position.

The jib crane 14 performs a hoisting operation in conjunction with the shortening of the telescopic mast 29 at this time. By controlling this operation synchronously, the jib crane 14 When 29 is shortened, the jib crane winds up the channel box 33 in synchronization with this shortening.

Thus, the fuel fixed type new fuel inspection apparatus 19
When the overhead crane approaches during this work and the telescopic mast 29 is shortened to avoid interference, the channel box 33 descends and the channel box 33 and the new fuel unit 8 interfere with the surroundings, causing damage. As a result, the work efficiency of the overhead crane or the jib crane 14 can be prevented because it is prevented from being temporarily received.

Channel box 33 for new fuel body 8
The mounting operation of the new fuel body 8 is substantially the same as the mounting operation of the new fuel body 8 described above. Lift the channel box 33 higher than 8. The channel box 33 is guided by the guide devices 23a and 23b to an appropriate position with respect to the new fuel body 8, and is suspended by the jib crane 14 to be mounted with the weight of the channel box 33.

At this time, in the fuel holding plate 38,
After the variable square hole 39 is slightly widened and the channel box 33 is inserted, the variable square hole 39 is fitted to the outer periphery of the channel box 33 to be maintained at the axial center. Channel box 33 attached by weight to new fuel body 8
Has a small space between the upper end of the new fuel body 8 and the upper end thereof.
The channel box pressing portion 34 is made to coincide with the upper end position of the channel box 33 by rotating the channels 24a and 24b approximately 90 degrees from the storage position.

Next, the air piston 32 is driven, and the upper end of the channel box 33 is sufficiently pressed down by the channel box pressing portion 34, so that the channel box 33 is mounted in close contact with the upper end of the new fuel body 8. After this, the channel box pressing portion 34 is slightly raised, and the channel fastener 36 is arranged at the upper end of the channel box 33.
The channel fastener is again pressed at the channel box pressing section 34
Holds 36.

In this state, the channel box pressing portion 34
By rotating the bolt attaching / detaching portion 35a of the channel fastener attaching / detaching mechanism 35 built in at the tip of the fuel cell and tightening the fixing bolt 37, the channel box 33 is fixed to the new fuel body 8 together with the channel fastener 37.

The new fuel assembly 8 in which the mounting of the channel box 33 is completed is in a state of a new fuel assembly, and is taken out of the fixed fuel type new fuel inspection device 19, but is carried out in substantially the reverse order of the above-mentioned mounting work. . First, the channel box pressing device 34 of the channel box mounting device 24a, 24b is raised, and then the channel box mounting device 24a, 24b is raised.
The storage position is obtained by rotating 24a and 24b by approximately 90 degrees.

Further, as for the fuel holding devices 25a and 25b, the fuel holding plate 38 is moved from the clamp arm 43 of the fuel clamp devices 26a and 26b and the channel box 33 by the fuel holding plate clamping mechanism 40 and the fuel holding plate moving mechanism 41. Remove and rotate 90 degrees to the storage position.

Next, after the new fuel body 8 with the channel box 33 mounted thereon is suspended by a lifting machine such as an overhead crane, the clamp arm 43 is opened by the opening / closing device 42 of the fuel clamp devices 26a and 26b, and the fuel fixed type new It is taken out of the fuel inspection device 19 and transported to a predetermined storage place.

After the inspection of all the new fuel bodies 8 is completed and the mounting of the channel box 33 is completed, the base fixing device 20 is released from the fuel fixed type new fuel inspection device 19, and the fuel handling floor 2 is removed. Self-propelled by the self-propelled mechanism,
Move to a designated storage area with an overhead crane and store.

According to the fuel fixed type new fuel inspection device 19 according to the first embodiment, it is possible to inspect all the new fuel assemblies 8 independently, and the telescopic mast 29 can be used to expand and contract the channel box 33 and the like. By providing the lifting jib crane 14, it is possible to avoid interference with a lifting machine or the like provided in the reactor building 1.

For mounting the new fuel body 8 and the channel box 33, guide devices 23a and 23b, channel box mounting devices 24a and 24b, and fuel holding devices 25a and 25b and fuel clamp devices 26a and 26a, which are automatic fuel clamping mechanisms.
By providing 26b, work can be automated, workability can be improved and work time can be shortened, and work efficiency at the time of new fuel inspection, work time can be shortened, and worker exposure can be reduced.

Further, after the work is completed, the work including the overhead crane is stored in a storage place without exposure without hindering other work, and the fuel handling floor 2 is secured in a temporary storage space for the equipment and the other. It can be used effectively for work.

The second embodiment relates to claims 3 to 10 and 12, and detailed description of the same components as those in the first embodiment and the operation thereof will be omitted. .

As shown in the front view of FIG. 6 (a) and the plan view of FIG. 6 (b), the fuel-movable new fuel inspection device 44 can be transported by a hoist, etc. A base 45 provided with a fixing device 20 for fixing, and this base
On the top of 45, a main column 46 to which a jib crane 14 as a lifting machine for lifting the new fuel body 8 and the channel box 33 is installed is installed.

On the main column 46, a substantially prismatic new fuel body 8 is mounted upright on both sides, and guide rails for guiding movable tables 47 a, 47 b vertically moving through the base 45.
48a, 48b, and the movable tables 47a, 47
A drive device for arbitrarily moving up and down b is built in.

Further, movable tables 47a, 47b are provided inside the main pillar 46.
The guide rails 48a and 48b are extended to the side surfaces to hold the movable tables 47a and 47b movably up and down, and extend and contract through the base 45 to support the load of the movable tables 47a and 47b. The load supporting mechanisms 49a and 49b are provided with a driving mechanism (not shown) (claim 3).

The load supporting mechanisms 49a and 49b are lowered from the base 45 into the pits 50 so that the lower ends thereof are pitted.
The movable table 47a, 47
The load received by b is supported by the bottom of the pit 50 (claims 4 and 12). By providing a self-propelled mechanism such as a wheel and a drive device (not shown) to the fixing device 20, the fuel-fixed type new fuel inspection device 19 can be self-propelled, moved to a predetermined position, and fixed (claim 10). .

On the upper portions of the movable tables 47a and 47b, guide devices 23a and 23b for guiding the new fuel body 8 and the channel box 33 to predetermined positions from above, and the channel box 33 are mounted on the new fuel body 8. Channel box mounting devices 24a and 24b are provided.

The new fuel body 8 and the channel box
There are provided fuel holding devices 25a and 25b for holding the shaft 33 at the center of the shaft, and fuel clamp devices 26a and 26b for rotatably holding each new fuel body 8 and the channel box 33 around the center of the shaft. . The guide devices 23a and 23b and the channel box mounting devices 24a and 24b, and the fuel holding devices 25a and 25b and the fuel clamp devices 26a and 26b operate in the same configuration as in the first embodiment. (Claims 6 to 9, 12).

Next, the operation of the above configuration will be described. The fuel transfer type new fuel inspection device 44 can be installed and used in the existing pit 26 without necessarily using the dedicated inspection pit 13 on the fuel handling floor 2 of the reactor building 1. Upon inspection and inspection of the new fuel assembly 8, the fuel-movable new fuel inspection device 44 is moved from a storage location by self-propelled by a self-propelled mechanism (not shown) provided in the fixing device 20, or a ceiling installed in the reactor building 1. The new fuel body 8 is transported over the pit 50 at a predetermined place where the inspection of the new fuel body 8 is performed by a crane or the like.

The pit 50 has the same depth as the entire length of the new fuel body 8 or the existing pit, which is deeper than the entire length of the new fuel body 8, similarly to the conventional inspection pit 13 on the fuel handling floor 2.
After the fuel-movable new fuel inspection device 44 is installed on the pit 50, it is fixed by the fixing device 20.

Thereafter, the movable supports 47a and 47b are moved up and down by lowering the load supporting mechanisms 49a and 49b from the base 45 into the pits 50 by a driving mechanism (not shown) and bringing the lower ends thereof into contact with the bottom. Guide rails 48a, 48b
Are formed below the base 45 and the base 45
Is supported at the bottom of the pit 50 to improve stability.

Since the pit 50 is deep, a load supporting mechanism is provided.
If the lower end does not contact the bottom of the pit 50 even if the entire length of the 49a, 49b is lowered from the base 45, the pit 50
Support of the base 45 by the bottom of the can not be expected. But,
The movable table 47 is moved by the lowered load supporting mechanisms 49a and 49b.
Guide rails 48a and 48b are formed long enough to move a and 47b into the pit 50, and the movable tables 47a and 47b are formed.
To support the load it receives.

Further, the load supporting mechanism 49 is driven by a driving mechanism.
A built-in proximity sensor automatically lowers the a, 49b to stop it in contact with the bottom of the pit 50 and lowers the entire length of the load supporting mechanisms 49a, 49b.

The mounting of the new fuel body 8 in the fuel-movable new fuel inspection apparatus 44 is performed by mounting the new fuel body 8 on the movable bases 47a and 47b which have been moved to a position higher than the base 45 in advance. A new fuel assembly 8 suspended by an overhead crane or a jib crane 14 installed in the reactor building 1
The guide device 23 shown in FIG. 2 provided above 47a and 47b.
The lower end of the new fuel body 8 is inserted into a and 23b.

The guide devices 23a and 23b are made of a material which does not damage the surfaces of the new fuel body 8 and the channel box 33 and have a smooth surface shape.
Thereby, the new fuel body 8 is guided to a predetermined position on the movable tables 47a and 47b. As in the first embodiment, the rotatable holding of the new fuel body 8 mounted on the movable tables 47a and 47b while maintaining it at the axial center can be performed by about 90 degrees from the storage position shown in FIG. Moved fuel holding devices 25a, 25b
Is performed by the fuel clamp devices 26a and 26b shown in FIG.

The inspection and inspection work for the new fuel assembly 8 mounted on the fuel-transportable new fuel inspection device 44 is carried out by workers and inspectors on the base 45 and the fuel handling floor 2.
For example, the movable bases 47a and 47b on which the new fuel body 8 is mounted are temporarily driven by the driving device to guide the guide rails 48a and 48a of the main column 46.
48b is moved under the base 45 to
a, 49b.

Thereafter, the drive unit is operated to move the movable table 47.
While gradually raising a and 47b, the new fuel body 8 is rotated around the axis, and inspection such as cleaning by an operator and inspection by an inspector is performed on the entire length and the entire circumference. The movable table 47a,
Since there are two units 47b, each of which can be moved up and down arbitrarily by each drive unit, the two new fuel units 8 can be inspected individually and freely, so that highly efficient work is possible.

The channel box 33 is mounted on the new fuel body 8 that has been inspected. In order to mount the channel box 33 from above the new fuel body 8, the jib crane 14 provided on the top of the main column 46 is used. I do.

At this time, the movable platform on which the new fuel body 8 is mounted
47a and 47b are moved to the lower part where the upper part thereof slightly protrudes above the base 45, and the channel box 33 is moved from above the new fuel body 8 to the guide device 23a similarly to the mounting of the new fuel body 8. , 23b, and is suspended by the new fuel body 8 to be mounted by the weight of the channel box 33.

Further, the new fuel body 8 having the channel box 33 mounted thereon is maintained at the center of the axis by the fuel holding devices 25a and 25b and the fuel clamping devices 26a and 26b, and the channel box 33 mounted on the new fuel body 8 is provided. In response to this, the upper end of the channel box 33 is pushed down by the channel box mounting devices 24a and 24b which are rotated substantially 90 degrees from the storage position, so that the channel box 33 is moved to the new fuel body 8.
Attach it closely to the upper end of the

Thereafter, the channel fastener attaching / detaching mechanism 35
As a result, the channel box 33 is fixed to the new fuel body 8 together with the channel fastener 37 by tightening the set bolt 37. The mounting load of the channel box 33 and the pressing load by the channel box mounting devices 24a and 24b are:
Without being directly borne by the movable tables 47a and 47b, they are supported at the bottom of the pit 50 via the load support mechanisms 49a and 49b or the load support mechanisms 49a and 49b.

The new fuel assembly 8 with the channel box 33 mounted thereon is used as a new fuel assembly as a fuel-movable new fuel inspection system.
From 44, the new fuel body 8 is taken out and transported to a predetermined storage place in the reverse order of the loading procedure. Further, the fuel-injection-type new fuel inspection device 44 in which the inspection of all the new fuel bodies 8 and the mounting of the channel box 33 have been completed, the load supporting mechanisms 49a and 49b
At the same time, the movable tables 47a and 47b are moved above the base 45.

Next, the fixing device 20 is released and moved by a self-propelled mechanism provided in the fixing device 20, or lifted by an overhead crane or the like, and the new fuel inspection device 44 is transferred to a predetermined storage location. store.

[0106]

As described above, according to the present invention, at the time of inspection of new fuel used in a nuclear power plant and installation work of a channel box, storage of a fixed fuel type or fuel movable type new fuel inspection apparatus and transfer to a work place. And the work time can be shortened by improving the workability of inspection of new fuel and mounting of the channel box. As a result, it is possible to improve the work efficiency at the time of new fuel inspection, reduce the burden on the workers, and further reduce the exposure.

[Brief description of the drawings]

FIG. 1A is a front view and FIG. 1B is a plan view of a fixed fuel type new fuel inspection device according to a first embodiment of the present invention.

FIGS. 2A and 2B show a guide device according to first and second embodiments of the present invention, wherein FIG. 2A is a front view and FIG.

FIGS. 3A and 3B are front views of channel box mounting apparatuses according to the first and second embodiments of the present invention.
(B) shows the principal part enlarged sectional view.

FIGS. 4A and 4B are front views and FIG. 4B is a plan view of the fuel holding device according to the first and second embodiments of the present invention.

FIGS. 5A and 5B are a front view and a plan view of a fuel clamp device according to the first and second embodiments of the present invention.

6 (a) is a front view and FIG. 6 (b) is a plan view of a fuel-movable new fuel inspection device according to a second embodiment of the present invention.

FIG. 7 is a plan view of a fuel handling floor of a reactor building.

8 (a) is a front view, FIG. 8 (b) is a side view, and FIG. 8 (c) is a plan view.

9 (a) is a front view, FIG. 9 (b) is a side view, and FIG. 9 (c) is a plan view.

[Explanation of symbols]

1 ... reactor building, 2 ... fuel handling floor, 3 ... reactor well,
4. Fuel pool, 5: In-furnace equipment storage pit, 6: New fuel inspection device, 7, 19: Fixed fuel type new fuel inspection device, 8: New fuel body, 9: Fuel support column, 10, 27a, 27b ... Inspection lifter, 11, 28a, 28b Lifter drive unit, 12, 44 ... Fuel-injection type new fuel inspection device, 13 ... Inspection pit, 14 ... Jib crane, 15 ... Movable support column, 16a, 16b, 47a, 47b
... movable table, 17a, 17b ... movable table drive, 18 ... inspection floor,
20 ... fixing device, 21, 45 ... base, 22, 46 ... main pillar, 23a,
23b: Guide device, 24a, 24b: Channel box mounting device, 25a, 25b: Fuel holding device, 26a, 26b: Fuel clamp device, 29: Telescopic mast, 30: Guide roller, 31
... Guide bar, 32 ... Air piston, 33 ... Channel box, 34 ... Channel box pressing part, 35 ... Channel fastener attaching / detaching mechanism, 35a ... Bolt attaching / detaching part, 36 ... Channel fastener, 37 ... Set bolt, 38 ... Fuel holding plate,
38a: Roller, 39: Variable square hole, 40: Fuel holding plate clamping mechanism, 41: Fuel holding plate moving mechanism, 42: Opening / closing device, 43: Clamp arm, 48a, 48b: Guide rail, 49a, 49b: Load supporting mechanism , 50 ... pit.

Claims (12)

[Claims] 1. A new fuel inspection apparatus for inspecting a new fuel body of a nuclear reactor and mounting a channel box, wherein a main pillar for holding a fuel body and the like is installed upright along a side surface on a base provided with a fixing device. A new fuel inspection device, wherein a lifting machine is provided on a telescopic mast at the top, and an inspection lift is provided on the side of the main pillar so as to be vertically movable for each fuel body. 2. A hoist provided on a telescoping mast at the top of the main pillar controls synchronous operation of shortening the telescoping mast and hoisting the hoist when approaching another hoist. 2. The new fuel inspection device according to 1. 3. A new fuel inspection apparatus for inspecting a new fuel body of a reactor and mounting a channel box, wherein a main pillar is installed upright on a base provided with a fixing device, and a lifting machine is provided on the top, and A new fuel inspection apparatus, comprising: a movable base on which a fuel body and the like are mounted on a side portion of a pillar, the guide rail and a load supporting mechanism that moves vertically, and the movable table is vertically movable. 4. The new fuel inspection according to claim 3, wherein the load supporting mechanism formed with the guide rail of the movable base supports the movable base by bringing a lower end portion into contact with a bottom of a pit at an installation location. apparatus. 5. A guide device for guiding a fuel body or the like to a predetermined position on the upright main column or movable platform, a channel box mounting device for fixing a channel box to the fuel body, and holding the fuel body or the like about an axis. 5. The new fuel inspection device according to claim 1, further comprising: a fuel holding device that holds the fuel body and a fuel clamp device that holds the fuel body and the like rotatably about an axis. 6. The new fuel according to claim 5, wherein the guide device for guiding a fuel body or the like provided on the main column or the movable base is provided with a guide roller inside a lower part of the flared guide bar. Inspection equipment. 7. A channel box mounting device rotatably provided on said main column or movable base comprises a channel box pressing portion which moves up and down, and a channel fastener attaching / detaching mechanism provided at a tip of said channel box pressing portion. The new fuel inspection device according to claim 5, wherein: 8. A fuel holding plate rotatably provided on the main column or the movable base, wherein the fuel holding plate has a disk-like shape provided with a variable square hole for inserting a fuel body or the like in the center and a roller around the fuel holding plate. 6. The new fuel inspection apparatus according to claim 5, further comprising a fuel holding plate clamp mechanism and a fuel holding plate moving mechanism that rotatably hold the fuel holding plate plate in a detachable and vertically movable manner. 9. The fuel clamp device provided on the main column or the movable base comprises a two-part annular clamp arm for maintaining a fuel body or the like about an axis and an opening / closing device for opening and closing the clamp arm. The new fuel inspection device according to claim 5, wherein 10. The new fuel inspection device according to claim 1, wherein the fixing device provided on the base has a self-propelled mechanism incorporated therein to enable self-propelled movement. 11. A proximity wherein a telescopic mast provided on the telescopic mast and a synchronous operation control of a hoist and a hoist and a channel box mounting device provided on a main column, a fuel holding device and a fuel clamp device are respectively incorporated. 6. The new fuel inspection device according to claim 2, wherein the device is automatically operated by a signal from a sensor. 12. A load support mechanism provided on the main column and a channel box mounting device provided on a movable base, and a fuel holding device and a fuel clamp device are automatically operated by signals from proximity sensors incorporated therein. The new fuel inspection device according to claim 4, wherein: