JP2568317B2 - Storage rack for spent fuel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spent fuel storage facility of a nuclear power plant, and more particularly to a shape of a joining member for joining a rectangular cylinder forming a spent fuel storage rack and a spent fuel. The present invention relates to a method of manufacturing a storage rack for use.

[0002]

2. Description of the Related Art An example of a prior art relating to a spent fuel storage rack will be described with reference to FIGS. This is disclosed in JP-A-1-280296. FIG.
Is a perspective view of a spent fuel storage rack, FIG. 11 is a front view of the spent fuel storage rack, FIG. 12 is a partial cross-sectional view of the spent fuel storage rack, and FIG. 13 is a perspective view of a joining member. 14 is a cross-sectional view of the main part of the joint before welding, FIG. 15 is a cross-sectional view of the main part of the joint after welding, and in those figures, 1 is a rectangular cylinder, 2 is a joining member, and 3 is a notch. Numerals 4 and 4 indicate the deposited metal.

[0003] The whole view of the spent fuel storage rack is as shown in FIG. 10, and as shown in FIG.
The two rectangular cylinders 1 are joined together by the weld metal 4 filled in the notch of the joining member 2 inserted in the gap between them.
FIG. 12 shows a state in which the joining member 2 shown in FIG. 13 is inserted into the gap between the two rectangular cylinders 1.
Reference numeral 5 denotes a state before and after the notch 3 is filled with the weld metal 4.

[0004]

However, in the above-mentioned technical example, the dimensions of the joining member on the inlet side and the outlet side are the same and the thickness is uniform in the longitudinal direction, while the gap at the corner portion is different. Since there was variation, the joining member was large and could not be inserted, or conversely, a large gap occurred between the corner gap and the joining member, and good welding could not be performed .
And, furthermore, hold the joint member while welding
It is difficult and difficult to maintain,
While adjusting to trial and error the position in front of the square tubular body Te this holding also assembled there is a disadvantage must Ne assembly.

SUMMARY OF THE INVENTION An object of the present invention is to provide a joining member which makes up the above-mentioned drawbacks in the prior art and makes it easy to assemble a rectangular cylinder.

[0006]

The above object can be achieved as follows.

[0007] (1) a plurality of square tubular body disposed in a checkered pattern, and inserting the connecting member into the gap between the neighbor corners of two square tubular body corners are adjacent to each other, for the joint by welding the member of the two square tubular body, the fuel storage rack already used with no such section to form formed a grid storage space, between adjacent corner portions of the rectangular cylindrical body
The joining member to be inserted into the
Formed and inserted into the gap between adjacent rectangular cylinders, and
A recess is provided at a substantially central portion on the side opposite to the insertion side, and this recess is provided.
The welding metal is embedded in the
That it was formed so as to be joined to the cylinder .

(2) The opposite side of the joining member from the insertion side is
Form a curved shape similar to the outer curved surface of the corner of the rectangular cylinder
It was.

(3) The joining member according to (1) or (2), wherein the joining member is made of stainless steel containing no boron.

(4) The above (1) made of ceramics
The joining member according to (2).

[0011]

[0012]

[0013]

[0014]

[0015]

[0016]

[Operation] That is, the spent fuel storage formed as described above is used.
In the case of a storage rack, two rectangular cylinders
Joining member that can be attached to fill the gap in the corner
Because the insertion side is wedge-shaped,
It is easy to insert into the gap of the part, and the amount of the gap fluctuates
In addition, the insertion amount of the joining
And the outside of the corner of the rectangular cylinder
Since it is formed in a curved shape similar to the surface, this joint
The gap between the material and the rectangular cylinder becomes small,
Can be prevented from coming out, so from these things
It is very easy to join the rectangular cylinder and the joining member by welding.
It becomes Furthermore, since the insertion side is wedge-shaped,
When it is inserted into the gap of the
It is not necessary to hold it in a special way until it is welded
And it is easy to hold, and the rectangular cylinder and the joint
The welding work with the material becomes easy, and the rectangular cylinder is efficiently
It can be assembled with high accuracy.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 7 show one embodiment, FIG. 8 shows another embodiment,
9 is a view of another embodiment, FIG. 1 is a partial cross-sectional view of a spent fuel storage rack, FIG. 2 is an explanatory view of an inserted state of a joining member, and FIG. 3 is an enlarged view of a main part of FIG. Explanatory diagram,
4 is a perspective view of the joining member, FIG. 5 is a cross-sectional view of the joint before welding, FIG. 6 is a cross-sectional view of the joint after welding, and FIG. 8 is an explanatory view of a joining member having a curved shape, FIG. 9 is an explanatory view of welding using a backing metal, 5 is a rectangular cylinder feeding device, 6 is a gantry, 7 to 10 are trolleys, 11, 12 Is a beam, 13 and 14 are gripping tools, 15 is a joining member having a curved shape, 16 is a backing metal, 17 is a welded metal when a backing metal is used,
This is the above code.

FIG. 1 is a sectional view of a core box adjacent to each other of two rectangular cylinders.
FIG. 2 shows a state in which the joining member 2 is inserted into the gap of the corner portion, FIG. 2 shows a state in which the joining member 2 is disposed at a predetermined interval in this gap, and FIG. The main part into which the member 2 is inserted is shown in an enlarged manner. Joining member 2
As shown in FIG. 4, since the width on the insertion side is small and wedge-shaped, it is easy to cope with a gap that fluctuates due to the accuracy of the rectangular cylindrical body 1, and the rectangular cylindrical body 1 can be easily assembled. There is an advantage that assembly is easy to automate. As shown in FIG. 4, the joining member 2 has a notch 3, and the notching 3 is filled with a welding metal 4 described below by welding, so that the joining member 2 and the two rectangular cylinders 1 are formed. Can be joined, and by repeating such joining, a spent fuel storage rack can be assembled. FIG. 5 shows a state in which the joining member 2 is inserted into a gap formed by the two rectangular cylinders 1, and FIG. 6 shows a state in which the notch 3 of the joining member 2 is filled with welding metal 4 by welding. ing.

Next, FIG. 7 shows an apparatus for assembling a spent fuel storage rack. The rectangular cylinder 1 is transported and mounted on the rectangular cylinder supply device 5 by a crane or the like. The mounted rectangular cylinder 1 is manually moved to a position where the rectangular cylinder 1 is easily gripped. The gantry 6 is for mounting the trolleys 7 and 8, and the trolleys 7 and 8 are mounted on the gantry 6 and mounted to be movable back and forth. It is mounted so that it can be moved. The beams 11 and 12 are mounted on carts 9 and 10 so as to be vertically movable. Further, the grips 13 and 14 are attached to the lower ends of the beams 11 and 12, respectively, so that a rectangular cylinder can be gripped by a cylinder (not shown). The rectangular cylinder 1 is gripped by the grips 13 and 14. It is transported from the position to the assembly position.

A joining member 2 is inserted into a gap formed between the conveyed square cylinder 1 before assembly and the assembled square cylinder 1.
Is inserted into the notch 3 of the joining member 2 with welding metal 4 by welding, and the joining member 2 and the rectangular cylinders 1 are joined to each other, whereby the rectangular cylinder 1 is assembled.

FIG. 8 shows a case where a joining member 15 having a wedge-like shape on the insertion side and a curved shape having a curvature of a corner of the rectangular cylinder 1 on the opposite side is used. In this case, the joining member 15 is used. There is an advantage that the gap between the metal and the rectangular cylinder 1 can be reduced, and the outflow of the deposited metal can be prevented. FIG. 9 shows a case where the backing metal 16 is applied to a gap formed between the pre-assembled rectangular cylindrical body 1 and the assembled rectangular cylindrical body 1, and the rectangular cylindrical body 1 and the backing metal 1 are placed.
6 shows a state in which the welding metal 17 is filled in the recess formed by 6 to join the rectangular cylinders 1 to each other. In this case, the backing metal acts to position the rectangular cylinder, so that the two rectangular cylinders 1 can be joined while maintaining an appropriate positional relationship without using the joining member 2, so that the joining member is unnecessary. Therefore, there is an advantage that the manufacturing cost is reduced accordingly.

As another embodiment, when welding,
In some cases, a joining member 2 made of ceramics or a joining member 15 having a curved shape is used (not shown), and the joining member 2, the joining member 15 having a curved shape, or the above-described welding. As the welding rod (not shown), any one made of stainless steel containing no boron can be used to obtain a spent fuel storage rack excellent in strength.

[0023]

As described above, according to the present invention, the joining member mounted to fill the gap between the adjacent corners of the rectangular cylinder has a wedge-shaped insertion side, so It is easy to insert into the gap of the part, and even if the amount of the gap fluctuates, the insertion amount of the joining member can be handled by making it deeper or shallower, and the opposite side is outside the corner of the square cylindrical body Since it is formed in a curved shape similar to a curved surface, the gap between the joining member and the rectangular cylinder is small, and it is possible to prevent the weld metal from flowing out. The joining of the members by welding is very easy. Furthermore, because the insertion side is wedge-shaped, when it is inserted into the gap at the corner,
It is not necessary to hold it by a special method until it is supported between the wall surfaces of the rectangular cylinder and welded, and the retention is easy, and the welding work between the rectangular cylinder and the joining member is easy. The storage rack can be efficiently and accurately assembled.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a spent fuel storage rack according to an embodiment of the present invention.

FIG. 2 is an explanatory view of an inserted state of a joining member according to one embodiment of the present invention.

FIG. 3 is an enlarged explanatory view of a main part of FIG. 2;

FIG. 4 is a perspective view of a joining member according to one embodiment of the present invention.

FIG. 5 is a cross-sectional view of a joint before welding according to one embodiment of the present invention.

FIG. 6 is a cross-sectional view of a joint after welding according to one embodiment of the present invention.

FIG. 7 is an explanatory view of an apparatus for assembling a rectangular cylinder according to an embodiment of the present invention.

FIG. 8 is an explanatory view of a joining member having a curved shape according to another embodiment of the present invention.

FIG. 9 is an explanatory view of welding using a backing metal according to another embodiment of the present invention.

FIG. 10 is a perspective view of a conventional spent fuel storage rack.

FIG. 11 is a front view of a conventional spent fuel storage rack.

FIG. 12 is a partial cross-sectional view of a conventional spent fuel storage rack.

FIG. 13 is a perspective view of a conventional joining member.

FIG. 14 is a cross-sectional view of a main part of a related art before welding.

FIG. 15 is a cross-sectional view of a main part of a conventional joint before welding.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Square cylinder, 2 ... Joining member, 3 ... Notch, 4 ... Welding metal, 15 ... Joining member having a curved shape, 16 ... Backing metal, 17 ... Welding metal when using a backing metal.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Takashi Sakurai 3-1-1, Sakaimachi, Hitachi-shi, Ibaraki Pref. Hitachi Plant, Ltd. (56) Reference JP-A-2-38996 JP-A-62-102191 (JP, A) JP-A-1-280286 (JP, A) JP-A-61-118697 (JP, A)

Claims (4)

(57) [Claims] [Claim 1] a plurality of square tubular body disposed in a checkered pattern, and inserting the connecting member into the gap between the neighbor corners of two square tubular body corners are adjacent to each other, the connecting member inserted by welding the two square tubular body, the fuel storage rack already used with no such section to form formed a grid storage space, between adjacent corner portions of the rectangular cylindrical body Joining material
However, the insertion side is formed in a wedge shape and the adjacent rectangular cylinder
At the center of the non-insertion side
Is provided with a recess, and the weld metal is buried in the recess.
By doing so, the joining member and the rectangular cylindrical body are joined.
A storage rack for spent fuel, characterized in that the storage rack for spent fuel is formed as follows . 2. The rectangular tube is provided on the side opposite to the insertion side of the joining member.
It is formed in a curved shape similar to the outer curved surface of the body corner
The storage rack for spent fuel according to claim 1 . 3. The bonding member according to claim 1, wherein said bonding member is a boron-free step.
3. The spent fuel according to claim 1, which is made of stainless steel.
Storage rack . 4. The joining member is made of ceramics.
A storage rack for spent fuel according to claim 1 or 2 .