JP2918185B2 - Volume reduction equipment for fuel insert assemblies for nuclear reactors - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention cuts a burnable poison assembly for spent fuel and a fuel insert assembly for a reactor such as a control rod cluster (hereinafter simply referred to as "assembly"). And an apparatus for performing volume reduction processing.

[0002]

2. Description of the Related Art Generally, as shown in FIGS. 17 (a) and 17 (b), a control rod cluster used for control in a nuclear reactor has a large number of rod-like portions 78 composed of control rods and a holding portion 80 called a spider. And the upper end of each rod-shaped portion 78 forms an assembly 76 joined to the holding portion 80. Further, the burnable poison assembly used as a neutron absorber is also an aggregate including a rod-shaped portion formed of a burnable poison rod or thimble plug and a holding portion formed of a hold-down bar or the like. Since these aggregates are easily bulky and difficult to store as they are, development of an apparatus for reducing the volume thereof has been promoted.

For example, Japanese Unexamined Patent Application Publication No. 61-264297 discloses a suspending device for gripping the holding portion 80 and suspending the entire assembly 76, and a cutting device for cutting the rod-shaped portion 78 of the assembly 76 two by two. 18 (see FIG. 17 (b)), and below the cutting device 18,
There is disclosed a device provided with a restraining means for restricting the position of the rod-shaped portion of the assembly suspended by the suspending device so as not to move in the lateral direction. According to this apparatus, the assembly 76 is lifted by the suspending tool, and each rod-shaped portion of the assembly 76 is restrained by the restraining means at a position corresponding to the cutting device 18 at the root (that is, the upper end). Then, by operating the cutting device in this state, each bar-shaped portion is
At the position indicated by the broken line 208 shown in FIG. 7B, two lines can be separated from the holding unit.

[0004]

The above-described apparatus cuts a large number of rod-shaped portions 78 in the horizontal direction at their upper ends (roots), thereby separating all the rod-shaped portions 78 from the holding portion 80. This is for performing volume reduction processing. When such a process is performed, the rod-shaped portions 78 are released from the state of being restrained by the holding portion 80. However, since the rod-shaped portions 78 still maintain a long shape, storage in the atmosphere is not possible. Difficult and generally stored in a pool. However, in recent years, since the number of the above-mentioned aggregates has been greatly increased, the storage in the pool is limited, and the development of more appropriate volume reduction processing is required. Further, when the bar-shaped portion 78 is stored upright while maintaining the long shape, there is also an inconvenience that the bar-shaped portion 78 is easily bent by its own weight.

Here, as shown in, for example, Japanese Utility Model Application Laid-Open No. 63-68000, each rod-shaped portion 7 subjected to a primary volume reduction process is used.
8 can be further cut at a plurality of locations and stored in the air, so that the storage space in the pool can be significantly reduced. However, according to such means, the primary volume reduction process is first performed, and Since the secondary volume reduction process must be performed for each of the large number of rod-shaped portions 78, there is a disadvantage that a large number of man-hours are required. In addition, since the remote operation, which is relatively difficult, is required for picking up each rod 78, the greater the number of rods 78 to be processed, the more disadvantageous in terms of work.

[0006] In view of such circumstances, an object of the present invention is to provide an apparatus capable of sufficiently and easily reducing the volume of an aggregate with a small number of man-hours.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a fuel insert assembly for a reactor having a plurality of rod-shaped portions and a holding portion to which the upper ends of these rod-shaped portions are joined is reduced in volume by cutting. An apparatus for processing, comprising: a main body having a length capable of storing the entire fuel insert assembly for a reactor, and holding the fuel insert assembly protruding below the main body. Gripping means configured to be able to move up and down between a gripping position for gripping the portion and a lifting position where the gripped reactor fuel insert assembly is lifted to a position where it is stored in the main body; An elevating drive means for driving, a retreat position provided at a lower end of the main body, the evacuation position at which the gripping means and the reactor fuel insert assembly pass through at the lower end, and a reactor fuel lifted by the gripping means Cutting position to cut the insert assembly And cutting means configured to cut all the rod-shaped portions of the nuclear fuel insert assembly at once at the cutting position, and provided at a position above the cutting means and lifted. And a restricting means for switching between a restricting state for restricting horizontal displacement of each rod-shaped portion of the nuclear fuel insert assembly and a releasing state for releasing said rod-shaped portion. 1).

The cutting means includes two cutting members each having a through hole through which each rod of the fuel insert assembly for a nuclear reactor can penetrate; It is preferable to provide a cutting operation means for relatively rotating between a cutting preparation position where the holes coincide with each other and a cutting completion position where the through holes of both cutting members are shifted (claim 2).

The term “gripping” is not limited to the operation of simply “grabbing” the holding portion of the aggregate, but broadly means the operation of fixing the holding portion so that the aggregate does not fall. Things.

[0010]

According to the apparatus described above, it is possible to reduce the volume sufficiently with a small number of steps by performing the following steps.

First, the holding means is lowered to the holding position below the main body in a state where the cutting means is retracted to the retreat position and the regulating means is switched to the released state. I do. Then, by raising the holding portion to the lifting position, the entire assembly is raised to a position above the cutting means.

Next, at a position above the cutting position, the restricting means restricts the horizontal displacement of each bar-shaped portion and moves the cutting means to the cutting position. In this state, the gripping means and the assembly suspended by the gripping means are lowered by a predetermined size, and the cutting means is operated, whereby cut pieces having the above dimensions can be cut out from all the rod portions. By repeating such a cutting step and the descending step alternately, all the rod-shaped portions can be cut at a plurality of locations. After the volume reduction processing of the rod-shaped portion is completed, the cutting means is returned to the retracted position, and the holding means is lowered to the lowermost holding position, thereby holding the aggregate held by the holding means. The part can be taken out of the apparatus main body.

Specifically, according to the apparatus of the second aspect,
In the above cutting step, the rod-shaped portions of the assembly are inserted from above into the through holes of both cutting members with both cutting members positioned at the cutting preparation position, and in this state, both cutting members are relatively rotated to the cutting completion position. By doing so, all the rod-shaped portions can be cut at once.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The overall structure of an apparatus for reducing the volume of an aggregate according to an embodiment of the present invention will be described with reference to FIG.

The volume reduction processing apparatus 10 shown in the figure includes a frame (main body) 11 extending in a vertical direction.
Is long enough to store the entire aggregate 76 described below. In the frame 11, a holding device body (holding means) 1 for holding the holding portion 80 of the assembly 76 is provided.
The gripping device main body 12 is configured to be able to move up and down between a lifting position indicated by a solid line in FIG. 1 and a gripping position indicated by a two-dot chain line in FIG. Here, the lifting position is set to a position high enough that the aggregate 76 lifted by the gripping device main body 12 is completely stored in the frame 11, and the gripping position is set at the lowermost end of the frame 11. The guide pin frame 60 is provided at a position low enough to protrude below the lower end surface of the guide pin frame 60 provided below.

At the upper end of the frame 11, there are provided a lifting winch 14 for raising and lowering the gripping device main body 12, and a gripping operation device 16 for switching the gripping device main body 12 between a gripping state and a released state. A cutting device 18 is provided at the lower end of the frame 11.
At a plurality of locations above the position 8, there are provided regulating devices 20, 22 for regulating the horizontal displacement of the rod-shaped portion 78 of the assembly 76 suspended by the gripping device main body 12. Further, a suspended plate 24 is fixed to the uppermost end of the frame 11, and the entire volume reduction processing apparatus 10 can be suspended using the suspension holes 26 provided through the suspended plate 24. .

In FIG. 1, reference numeral 17 denotes a positioning plate for positioning the entire apparatus at a predetermined position.

Next, the gripping device main body 12 and a mechanism for raising and lowering the same will be described with reference to FIGS.

As shown in FIG. 2, a first cylindrical member 28 is fixed to the upper center of the frame 11, and a gripping drive motor 32 is mounted on the outer peripheral surface of the upper end thereof via a bracket 30 in an upward direction. , The first cylindrical member 28
The casing 34 is fixed to the upper end of the casing. A driving shaft 33 of the gripping drive motor 32 faces the inside of the casing 34 through a through hole 34 a provided in a bottom wall of the casing 34, and a gear 35 is fixed to an end of the driving shaft 33. Upper and lower ends of a cylindrical rotary shaft 38 are rotatably supported by the casing 34 via bearings 40 and 41, and a gear 42 fixed to a lower outer peripheral surface thereof is provided in an intermediate portion provided in the casing 34. The gear 35 is engaged with the gear 35 via a gear 36.

The rotating shaft 38 is connected to the first cylindrical member 28.
And the lower end thereof is led out below the casing 34. The upper end of the second tubular member 44 is fixed to the leading portion, and the third tubular member 46 is fitted inside the second tubular member 44. As shown in FIG. 3, the cross sections of the second tubular member 44 and the third tubular member 46 are irregularly shaped, and they are fitted so that they cannot rotate relative to each other and can move up and down relatively.

A fourth tubular member 48 is fitted inside the first tubular member 28. These first cylindrical members 28
The fourth tubular member 48 also has an irregular cross section as shown in FIG. 3, and both are fitted so as to be relatively non-rotatable and relatively vertically movable.

As shown in FIG. 4, the third cylindrical member 46
A hanging bell-shaped first gripping member 52 is fixed to the lower end of the bracket through a bracket 50. On the other hand, at the lower end of the fourth tubular member 48, a hanging bell-shaped second gripping member 54 which is slightly larger than the first gripping member 52 is fixed. 54, the bracket 50
And the first gripping member 52 is fitted.

Accordingly, when the gripping drive motor 32 operates and the driving shaft 33 rotates, this rotation is applied to the intermediate gear 3.
6, the rotation shaft 38, the second cylinder member 44, the third cylinder member 46, the bracket 50, and the first gripping member 52 are integrally formed with the first cylinder member 28, 4 and relative to the second holding member 54.

Arms 56 extend in the left-right direction from the outer peripheral surface of the second gripping member 54, and guided members 58 extending vertically are fixed to the ends of these arms 56. The guided member 58 has a substantially arc-shaped groove, and is fixed to the tip of the arm 56 in a state where the groove is opened outward. On the other hand, a guide pin bracket 60 having a square cross section as shown in FIGS. 5 and 6 is provided at the lowermost end of the frame 11, and a guide pin 61 extending vertically is fixed at a diagonal position on the left and right sides. In a state where the gripping members 52 and 54 are lowered to the gripping positions shown by the solid line in FIG. 5 and the two-dot chain line in FIG.
The above-mentioned guided members 58 are fitted to the guide pins 61, respectively, and the guide pins 61 perform vertical guidance. Also, as shown in FIG.
The guide pins 62, 63, 64 similar to those of FIG.
5, the guide pins 61 to 64 are fixed in place on the frame 11, and all the guide pins 61 to 64 are arranged on the same straight line.

The rope 66 derived from the elevating winch 14 shown in FIG. 1 is put on a fixed pulley 68 shown in FIG.
The rotating shaft 38, the third cylindrical member 46, and the bracket 50 shown in FIG. A hanging member 72 having an outer diameter larger than the central through hole is fixed to a lower end portion of the rope 66 via a fixing member 70. A connection between the upper surface of the hanging member 72 and the lower end surface of the bracket 50 is formed. A cushion spring 74 is press-fitted therebetween.

Therefore, the fourth member 48 is lowered with respect to the first member 28 by its own weight and the second member 44
The third member 46 descends by its own weight,
The fourth member 48 rises with respect to the first member 28 by lowering the two gripping members 52 and 54 to the gripping position and conversely winding up the rope 66 with the elevating winch 14,
Further, while the third member 46 is raised with respect to the second member 44, the two gripping members 52 and 54 are lifted.

In FIG. 2, reference numeral 75 denotes a limit switch for detecting that the fourth member 48 has risen to the uppermost position.

As shown in FIG. 7, the first holding member 5
2, a pair of L-shaped slits 5 having a fixed width
2a are formed, and a pair of linear slits 54a having the same width as the slits 52a and extending in the up-down direction are formed below the second gripping member 54. On the other hand, the aggregate 76 to be processed by the apparatus 10 of the present embodiment is a burnable poison aggregate, and includes a number of rods 78 and a holding unit 80 to which the upper ends of the rods 78 are joined. The upper surface of the holding portion 80 has the slit 52
A, a gripped portion 80a having a T-shaped front view and having a width capable of being fitted into the a, 54a is provided upright.

Accordingly, with the upper and lower linear portions of the slit 52a aligned with the slit 54a, both ends of the gripped portion 80a are fitted into the slits 52a, 54a from below to the upper ends of the slits 52a, 54a. In this state, the gripping operation motor 32 is operated to rotate the first gripping member 52 in the clockwise direction in a plan view with respect to the second gripping member 54, so that the slit 52a of the first gripping member 52 is rotated. The gripped portion 80 is
a can be gripped so as not to fall. By performing the reverse operation, the slits 52a, 54a
It is possible to release the gripped portion 80a from the above.

Next, the structure of the cutting device 18 will be described with reference to FIGS.

A frame 82 having a rectangular through hole 81 is fixed to the lower end of the frame 11, and the guide pin bracket 60 is fixed below the frame 82 via a bracket (not shown). A rotation plate 86 is rotatably mounted on one side (the right side in FIG. 8A) of the frame 82 via hinge members 84 and 85.

On the upper surface of the rotary plate 86, a pair of front and rear (in FIG. 8A, a pair of upper and lower)
9 is connected to a pin 92 via a bracket 90 so as to be rotatable around a pin 92. The head-side end of each telescopic cylinder 88 is rotatably mounted on a horizontal shaft 94 provided on the frame 11. ing. And this telescopic cylinder 88
Due to the expansion and contraction of the pivot plate 86, the turning plate 86 cuts the through-hole 81 of the frame 82 at a cutting position (a position indicated by a solid line in FIGS. (A position shown by a two-dot chain line in FIG. 6).

A cutting table 95 having a circular shape in a plan view is provided on the rotating plate 86. A column 96 is projected upward on the outer periphery of the cutting table 95, and a first cutting plate (cutting member) 98 is provided on the upper surface of the column 96 in a state parallel to the cutting table 95. Fixed. A second cutting plate 100 is provided at a position substantially in contact with the lower surface of the first cutting plate 98, and the second cutting plate 100 is mounted on the cutting table 95 in the up-down direction of a turning shaft 99. It is configured to be able to turn around. Further, through holes 102 having a diameter slightly larger than those of the rod portions 78 are formed at positions corresponding to the rod portions 78 of the assembly 76 on the cutting plates 98 and 100.

An arm 104 extends laterally from a part of the outer periphery of the second cutting plate 100. On the other hand, a cutting operation cylinder (cutting operation means) 106 is installed horizontally on the rotating plate 86, and a bifurcated bracket 109 is fixed to a tip of a rod 107 of the cutting operation cylinder 106. The arm 104 is rotatably connected around the pin 108 so as to sandwich the distal end of the arm 104, and the head-side end of the cutting operation cylinder 106 is rotatable about the pin 110 in the vertical direction. 86. Then, in the state where the cutting operation cylinder 106 is contracted (the state shown), the second
Each of the through-holes 102 of the cutting plate 100 corresponds to each of the through-holes 102a of the first cutting plate 98 (cutting preparation position; FIG. 8B).
In the state where the cutting operation cylinder 106 is extended, each of the through holes 102 of the second cutting plate 100 is completely displaced from each of the through holes 102a of the first cutting plate 98 (cutting completed position). The position of the member is set.

Next, a specific structure of the regulating devices 20 and 22 will be described with reference to FIGS. The regulating device 20
10 restricts the displacement of the bar 78 in the left-right direction (the left-right direction in FIG. 9), and the regulating device 22 controls the displacement of the bar 78 in the front-rear direction (the depth direction in FIG. 9). As shown in FIG.
Since it is simply arranged with the orientation changed by 0 °, only the regulating device 20 will be described here.

As shown in FIG. 9, brackets 112 extending in the depth direction of the figure are fixed to the left and right frames 11, and guide rails 114 extending in the same direction are fixed to each bracket 112. This guide rail 11
4, a horizontal first restricting plate 116 is fixed, and a horizontal second restricting plate 118 is attached to the guide rail 11.
4 so as to be slidable. Both regulation plates 1
The slits 116a and 118a are formed in the portions 16 and 118 at positions corresponding to the rod portions 78 of the assembly 76. These slits 116a and 118a extend in the depth direction of FIG.
8 has a width slightly larger than the diameter of
In a state in which the rods 16 and 118 are in contact with each other as shown in FIG.
8 is regulated in the left-right direction.

A pair of right and left regulating operation cylinders 120 extending in the front-rear direction are provided on both regulating plates 116 and 118, and the head-side end of the regulating operation cylinder 120 is placed on the first regulating plate 116. An end of the rod 123 of the restricting operation cylinder 120 is fixed to a mounting portion 124 erected on the second restricting plate 118 while being fixed to the mounting plate 122 which is erected. Therefore, this regulating device 2
0 is switched to a release position in which the two regulating plates 116 and 118 are separated to release the respective rod portions 78 when the two regulating operation cylinders 120 are extended, and conversely, when the two regulating operation cylinders 120 are contracted, Control plates 116, 118
The rods 78 come into contact with each other to restrict the displacement of each bar 78 in the left-right direction. Therefore, the horizontal displacement of each rod 78 is completely regulated by simultaneously restricting the displacement of each rod 78 in the left-right direction by the regulating device 20 and the displacement in the front-rear direction by the regulating device 22. It will be.

Next, a new volume reduction processing step which can be realized by the volume reduction apparatus 10, that is, a step of storing the aggregate 76 in the air, will be described with reference to the flowcharts of FIGS. It will be described with reference to FIG.

First, in performing the processing, the pool 1
A short rod-shaped storage container 130 and a holding storage container 132 are set at predetermined positions on the bottom of 26 (step P1 in FIG. 12). In FIG. 15, for convenience, the respective steps are drawn in a horizontal line, but steps P6 and P8 shown in FIG. 15 are performed at the same position, and steps P13 and P16 are also performed at the same position.

Further, the regulating devices 20 and 22 in the volume reduction processing device 10 are each in the released state, the cutting device 18 is switched to the retracted position, and the rope 66 of the elevating winch 14 is extended with respect to the gripping device main body 12. , Is lowered to a gripping position as shown by a two-dot chain line in FIG.

Next, a hanging metal fitting 128 as shown in FIG. 14 is hooked on the hanging hole 26 shown in FIG.
The whole is lifted and set on the assembly storage rack 129 as shown in the figure (process P2). By operating the gripping operation motor 32, both gripping members 5
After gripping the gripped portion 80a (FIG. 7) of the holding unit 80 in the above-mentioned assembly 76 at steps 2 and 54 (step P3), the rope 66 is wound up by the lifting winch 14 and the gripping members 52 and 54 are gripped.
Is raised to the lifting position, whereby the assembly 76 is lifted to a position where it is stored in the frame 11 (step P4).

Next, by switching each of the restricting devices 20 and 22 to the restricting state, the horizontal displacement of each rod-shaped portion 78 is restricted (ie, restrained), and the cutting device 18 is cut by a solid line shown in FIG. It is moved to the position (step P5). At this time, the cutting operation cylinder 106 of the cutting device 18 is contracted, and the second cutting plate 100 is kept at a cutting preparation position, that is, a position where the through holes 102a, 102 of both cutting plates 98, 100 coincide. .

Then, after the entire volume reduction processing apparatus 10 is set on the rod-shaped container 130 shown in FIG.
6) The gripping members 52 and 54 and the entire assembly 76 are integrally lowered by a predetermined size, specifically, a size to cut each bar-shaped portion 78 (step P7).
a, 102 from above. In this state, the cutting operation cylinder 106 is extended to cut the second regulating plate 100 at the cutting completion position, that is, the through holes 102 of both regulating plates 98 and 100.
By pivoting to the position where a and 102 are completely shifted (step P8), the lower end portions of all the rod-shaped portions 78 can be cut in a substantially horizontal direction by one operation. The cut portion becomes a short rod and falls into the aerial storage rod storage container 130 to be stored.

By repeating these steps P7 and P8, the respective rod-shaped portions 78 are sequentially divided from below, and the processing is finally completed (YES in the judgment J9). At this point, the remaining holding portions 80 are slightly raised by pulling up the gripping members 52 and 54 (step P10), and the cutting device 18 is retracted to the retracted position (step P11).
2, 54 are lowered to the gripping position (step P12). Then, after the entire apparatus 10 is set on the holding part storage container 132 (step P13), the holding part 80 is released from the gripping members 52 and 54 by operating the gripping operation motor 32. Is dropped into the holding portion storage container 132 and stored (step P14).

Here, if the storage containers 130 and 132 are not filled with the rod-shaped portion 78 or the holding portion 80 (NO in J15), the operation from the step P2 is repeated. If at least one of the 132 is full (determination J15: YES), the lid 133 is attached to the full container 130 (or 132) (step P16), and the container 133 is lifted up above the pool 126 by the lifting device 134. . Then, drainage and pre-decontamination are performed (Step P1).
7) Further decontamination on the floor (Step P18)
It is transferred to a storage place such as a warehouse by the truck 136 or the like (process P19).

As described above, the apparatus 10 has the cutting device 18 at the lower end of the frame 11 for cutting the entire rod-shaped portion 78 at a time, and the regulating devices 20 and 22 are located above the cutting device 18. Are arranged, the lowering step P7 and the cutting step P8 are repeated in a state where the rod-shaped portion 78 is restrained by the regulating devices 20 and 22,
The work of dividing each rod-shaped portion 78 can be performed by one cutting operation, and the number of man-hours is smaller than that in the conventional case where the rod-shaped portion 78 is cut off from the holding portion 80 and then each rod-shaped portion 78 is divided one by one. Can be greatly reduced. In addition, since the respective rod-shaped portions 78 are relatively positioned by the holding portion 80, a positional deviation hardly occurs even when sheared at once.

As an example, when the assembly 76 shown in FIG. 18 is divided by the broken line L in the same figure, in the conventional apparatus, each rod-shaped portion 78 is first divided from the holding portion 80 at the upper end thereof by two pieces. Since seven cutting operations must be performed for each bar 78, if the number of the rods 76 is 16, (16/2 + 7 × 16 =) 120 cutting operations must be performed. According to this device, a total of 8
The volume reduction processing of all the rod-shaped portions 76 can be completed by performing the cutting operation twice.

Further, since the cutting device 18 is integrated into the apparatus main body, the positioning of the assembly 76 with respect to the cutting device 18 is easier than in the case where another cutting device is installed in water, and the cutting device 18 The maintenance of 18 is also easy.

The volume reduction processing apparatus 10 can also perform a volume reduction processing step performed when the assembly 76 is stored in water, that is, a conventionally known primary volume reduction step. This step will be described with reference to FIG.

The steps P1 to P5 are the same as those in the above-described embodiment, except that the pool-shaped container 1
The rod-shaped storage container 138 and the storage container 140 longer than the storage container 30 and the storage container 132 are installed. Then, the volume reduction processing device 10 is set on the rod-shaped portion storage container 138 (step P6 ′ in FIG. 16), and the holding device main body 12 is lowered in this state, so that the aggregate stored in the frame 11 is lowered. 76 down,
The upper end of the bar-shaped portion 76 is adjusted to the cutting position of the cutting device 18 (step P7 '). By operating the cutting device 18 in this state, the assembly 76 is vertically divided in the vicinity of the upper end of the rod portion 78, and only the rod portion 76 is held while the holding portion 80 is being gripped by the gripper body 12. Is the holding unit 80
, And is dropped and stored in the rod-shaped storage container 138.

The rod-shaped container 138 is placed in a storage position underwater with the lid covered. On the other hand, the holding unit 80 held by the holding device body 12
Is put in the holding part storage container 140 (step P8 '), and when the inside of the holding part storage container 140 is filled with the holding part 80, the lid is also closed and placed at a predetermined underwater storage position.

Note that the present invention is not limited to the above embodiment, and the following embodiments can be taken as examples.

(1) In the present invention, regardless of the specific structure of the gripping means, the gripping members 52 and 54 having the slits 52a and 54a as described above are relatively rotated, and the holding portion 80 of the aggregate 76 is not limited. Various devices can be applied, such as a device that sandwiches a line.

(2) In the present invention, the position of the cutting means may be switched between the retracted position and the cutting position by sliding in the horizontal direction. However, if the position of the cutting device 18 is switched by rotation about the hinge members 84 and 85 as in the above-described embodiment, the cutting device 18 is retracted as in the case of moving the cutting device 18 forward and backward. The position can be switched in a limited space in the frame 11 without requiring any special space.

(3) In the present invention, the cutting means
As long as the rod-shaped portion 6 can be cut at the same time, it can be widely applied. However, two cutting plates 9 having through holes 102a and 102 corresponding to the respective rod portions 78 as in the above embodiment.
According to the apparatus provided with 8, 100 and relatively rotating them, there is an advantage that each bar-shaped portion 78 can be reliably cut. In the embodiment, the second cutting plate 100 is rotated by a single cutting operation cylinder 106. However, another cylinder is provided at a position 180 ° away from the cutting operation cylinder 106 in the opposite direction. If the cutting plates 98 and 100 are rotated relative to each other by the two cylinders, the cutting force of the rod-shaped portion 78 is doubled.

(4) The restricting means in the present invention is only required to be at a position above the cutting means and capable of restraining each bar-shaped portion, and the specific number and arrangement position may be appropriately set.

(5) In the above embodiment, the apparatus in which the aggregate 76 to be processed is a burnable poison aggregate having a T-shaped gripped portion 80a in a front view has been described. When the processing of the control cluster having no grasped portion is performed as shown in FIGS.
What is necessary is just to use the holding | maintenance apparatus main body as shown in 9,20.

In the figure, a gripping member 142 made of an elastically deformable material is connected to the lower end of the fourth cylindrical member 48, and the lower end 144 of the gripping member 142 has a complex shape having many irregularities. have. This gripping member 14
2, a tapered upper through-hole 145 a whose opening becomes smaller toward the bottom, and an upper through-hole 1
A flat lower through hole 145b having an opening of the same size as the lower end opening 45a is formed continuously. A plurality of guide grooves 147 extending in the generatrix direction are provided on the inner peripheral surface of the upper through hole 145a.

On the other hand, a male screw portion 46a is provided at the lower end of the third cylindrical member 46, and its outer diameter is set to a size that can be fitted into the lower through hole 145b of the gripping member 142. I have. Outside the male screw portion 46a, an enlarged diameter member 146 having a screw hole at the center capable of being screwed with the male screw portion 46a is fitted. The outer peripheral surface of the diameter-enlarged member 146 is tapered so as to match the inner peripheral surface of the upper through-hole 145a, and has a shape that can be fitted to the guide groove 147. The relative rotation of the diameter-enlarging member 146 with respect to 142 is restricted.

On the other hand, the holding portion 80 in the
A fitting hole 80b that opens upward as shown in FIG. The inner peripheral surface of the fitting hole 80b is set to have the same shape as the outer peripheral surface of the gripping member 142 when the gripping member 142 is in an expanded state, and the gripping member 142 is expanded in diameter. In the absence state, the holding member 142 can be inserted into the fitting hole 80b.

When the holding section 80 is gripped by such a structure, first, as shown in FIG.
6 is screwed into a position relatively above the male screw portion 46a, that is, in a state where the diameter of the gripping member 142 is not expanded, the expanded member 146 is inserted into the fitting hole 80b. Then, by rotating the third cylindrical member 46 from this state, the tapered enlarged member 146 is lowered with respect to the male screw portion 46a, and the enlarged member 146 pushes the gripping member 142 from the inside. By expanding, the gripping member 142 expands in diameter, and is in a state of being fitted in the fitting hole 80b of the holding portion 80 as shown in FIG. Accordingly, the holding portion 80 does not come off with respect to the gripping member 142, and the aggregate 76 can be hung in this state.

[0062]

As described above, according to the present invention, the cutting means for cutting all the rod portions of the assembly at one time is integrally incorporated into the lower end portion of the apparatus main body capable of storing the entire assembly, and the cutting means is used. Is also provided at an upper position, a restricting means for restricting the horizontal displacement of all the rod-shaped parts in the assembly lifted by the gripping means. By performing the cutting process while gradually lowering the aggregate inside, it is possible to cut the entire bar-shaped portion finely with a small number of man-hours, thereby significantly improving the work efficiency of the volume reduction process. effective.

Further, since the cutting means is integrated into the apparatus main body, the positioning of the assembly with respect to the cutting means is easier than in the case where another cutting apparatus is installed in water, and the maintenance of the cutting means is also easy. It will be easier.

In particular, as the cutting means, two cutting members having through holes through which the respective rod portions of the reactor assembly can penetrate, a cutting preparation position at which the respective through holes of both cutting members coincide with each other, and both cutting members are provided. The cutting operation means for relatively rotating the two cutting members with respect to the cutting completion position at which the respective holes of the member are displaced is provided. There is an effect that each rod-shaped portion can be cut simultaneously and reliably by simply rotating the rod-shaped portion from the position to the cutting completion position.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a device for reducing the volume of a fuel insert assembly for a reactor according to an embodiment of the present invention.

FIG. 2 is a sectional front view showing an upper end of the volume reduction processing device.

FIG. 3 is a cross-sectional plan view showing each cylindrical member provided in the volume reduction processing device.

FIG. 4 is a sectional front view showing a main part of a gripping device provided in the volume reduction processing device.

FIG. 5 is a sectional plan view showing a main part of the gripping device and a guide pin bracket for guiding the same.

FIG. 6 is a partially sectional front view showing a cutting device and a guide pin bracket provided in the volume reduction processing device.

FIG. 7 is a perspective view showing a main part of a gripping member in the gripping device.

8A is a plan view of the cutting device, and FIG. 8B is a cross-sectional view showing a part of a cutting plate of the device.

FIG. 9 is a front view of a regulating device provided in the volume reduction processing device.

FIG. 10 is a view as viewed from the direction indicated by the arrow A in FIG. 9;

FIG. 11 is a view as viewed in the direction of the arrow B in FIG. 9;

FIG. 12 is a flowchart showing a first half of processing steps executed by the volume reduction processing device.

FIG. 13 is a flowchart showing the latter half of the processing steps.

FIG. 14 is a process chart showing the above processing steps.

FIG. 15 is a process chart showing the above processing steps.

FIG. 16 is a process chart showing a step different from the above-mentioned processing steps.

17A is a plan view illustrating an example of a fuel insert assembly for a nuclear reactor, and FIG. 17B is a front view illustrating the assembly.

FIG. 18 is a front view showing an example of a cutting position of the assembly.

FIG. 19 is a cross-sectional front view showing a state before gripping a holding unit in a gripping device according to another embodiment.

FIG. 20 is a cross-sectional front view showing a state where the holding unit is gripped by the gripping device.

FIG. 21 is a cross-sectional front view showing a structure of a holding unit gripped by the gripping device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Volume reduction processing apparatus 11 Frame (main body) 12 Main body of gripping device (configures gripping means) 14 Elevating winch (elevating drive means) 16 Gripping operating device (configures gripping means) 18 Cutting device (cutting device) 20, 22 Regulatory device (Regulating means) 76 Nuclear reactor fuel insert assembly 78 Rod-shaped portion 80 Holding portion 98 First cutting plate (cutting member) 100 Second cutting plate (cutting member) 102, 102a Through hole 106 Cutting operation cylinder ( Cutting operation means)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G21F 9/30 G21C 19/37

Claims (2)

(57) [Claims] An apparatus for reducing the volume of a reactor fuel insert assembly having a plurality of rods and a holding part to which upper ends of the rods are joined by cutting, by volume cutting. ,
A main body having a length capable of storing the entirety of the fuel insert assembly for a reactor, a gripping position projecting below the main body and gripping a holding portion of the fuel insert assembly for a reactor, Gripping means configured to be able to be raised and lowered between a lifting position where the fuel insert assembly for a nuclear reactor is stored in the main body, a lifting drive means for driving the gripping means up and down, and the main body A retreat position at which the gripping means and the nuclear fuel insert assembly pass through at the lower end, and a cutting for cutting the reactor fuel insert assembly lifted by the gripping means And cutting means configured to cut at a time all the rod-shaped portions of the fuel insert assembly for a reactor at the cutting position, and provided at a position above the cutting means. A suspended reactor A fuel insert for a nuclear reactor, comprising: a restricting means for switching between a restricting state for restricting horizontal displacement of each rod portion of the fuel insert assembly and a release state for releasing the rod portion. Equipment assembly volume reduction processing device. 2. The apparatus for reducing the volume of a fuel insert assembly for a nuclear reactor according to claim 1, wherein each of the rod-shaped portions of the fuel insert assembly for a reactor is penetrable as the cutting means. Two cutting members having holes, and cutting operation means for relatively rotating these cutting members between a cutting preparation position where the respective through holes of both cutting members match and a cutting completed position where the respective through holes of both cutting members are shifted. An apparatus for reducing the volume of a fuel insert assembly for a nuclear reactor, comprising: