JPS59211892A - Fuel spacer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [1] Field of Application The present invention relates to fuel spacers, and particularly to independent cell spacers that can be incorporated into fuel rods and hollow rods of various diameters.

[Background of the invention]

Figure 1 shows an example of a fuel phase assembly used in a boiling water reactor. In Figure 1, 1 is an upper tie plate, 2 is a lower tie plate, 3 is a spacer, 4 is a fuel rod, and 5 1 is a spacer support rod, and 6 is a retaining protrusion. In FIG. The retaining protrusions 6 hold the fuel rods 4 and the spacer support rods 5 at constant intervals in the same axial direction. There is.

FIG. 2 shows an example of the structure of a spacer 3 consisting of round independent cells, and FIG. 3 an octagonal independent cell. In FIGS. 2 and 3, 4 is a fuel rod, 5 is a spacer support rod, 7 is a protrusion, 8 is a vertical plate spring, 9 is a round independent cell, and l.

is an octagonal independent cell, and 11 is a side band.

2nd section j, Figure 3 (set 1 to 1 4, spacer support rod 5 is inserted into 35+ vertical cell 9 or 10, supported by protrusion 7, cage, and temporary spring 8, and connected in a lattice shape. A side panel 11 is attached to the outer periphery of the independent cell.
It's dark.

In the spacer that holds the bonito flakes, the bonito flakes 4 and the spacer support rod 5! /'i There are 8 pairs with the outer diameter of supination, Su5, bone) Suitable for fuel of tights with a larger outer diameter of the spacer support rod than Ah.1'1J-(: Not available.

[Purpose of the invention]

The purpose of the present invention is to provide an independent cell spacer that can be applied to a fuel assembly having an outer diameter fuel rod, a spacer support rod, and a hollow rod. The symbol of Ucaki is a fuel rod inserted into an independent cell.

A spacer support rod and a hollow rod are pressed and held by a tin ring member arranged in a space between independent cells,
The purpose is to enable bag layers of fuel rods, spacer support lots, and hollow rods with different diameters.

[Embodiments of the invention]

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lol l throat 1 Figure 4 A9 and 'A': 4νiB is the 4+ of the present invention,
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i4JV (-Installation 2', Ko C Tsusun blade 1 small piece)
The third bulge 14 protrudes from the opening 1φ on the side surface of the round independent cell 9. The fuel W & 4 and the large-diameter spacer support rod 12 are inserted into the 7 lance-shaped independent cells 9]N(・ζ
Due to the protrusion 14 of the spring member 13, which was
Pressed from the j direction, 9)] Proper position 11 of A Dokkatsu cell 9
Be held in mind.

As shown in FIG. 4B, the spring 7'l) material 13 is pushed into the space of the round independent cell 9 with the lower end of the tin ring j. After the upper end of the spring ring member 13 and the upper Hfa of the round independent cell 9 are fitted in a state in which the L-shaped independent cell 9 protrudes from the extension, the lower end of the spring member 13 is displaced to the first position, and the round-shaped independent cell 9 is extended. It is fixed in the space between the independent cells 9. In this way, the spring member 13 is locked in the center of the round independent cell 9, and the protrusion 14 of the tin ring member 13 is connected to the fuel rod 4.
and can provide sufficient compression to hold the spacer support rods 12 in the proper position of the round independent cells 9.

The present embodiment is configured as described above, and it becomes possible to arrange large-diameter spacer support lots, which was conventionally impossible with an i41 person.

A second embodiment of the present invention is shown in Figure 15A and iJ's Figure 5B.

2445A and 5)B, the spring member 13 is installed in the space around the octagonal independent cell 10, and the protrusion 14 of the tin ring member 1.3 is inserted through the opening on the side of the octagonal independent cell 10. stands out.

The fuel rods 4 and the large-diameter spacer support rods 12 are pressed Jψ from four directions by the protrusions 14 of the spring members 13 that are attached around the pushed-in octagonal independent cell 0.
It is held in the proper position of the octagonal independent cell 10.

The present embodiment is configured as described above, and the same effects as in the first embodiment can be obtained.

Embodiment 3 A third embodiment of the invention is shown in FIGS. 6A and 61B.

In FIG. 6A and FIG. 6B, the spring member 13
is expressed in the space around the round independent cell 90 into which the large diameter spacer support rod 12 is inserted, and the spring member 13 is A protrusion 14 protrudes. The large diameter spacer support rod 12 is pressed from four directions by projections 14 of a spring member 13 attached to the periphery of the round independent cell 9 to be inserted, and is held in a proper position of the round independent cell 9.

The fuel rods 4 are held by a projection 7 on the inner surface of a round independent cell 9 and a vertical leaf spring 8 according to known techniques.

The present embodiment is configured as described above, and the same effects as those of the embodiment u1 and the second embodiment can be obtained.

The present VJ is an independent cell type spacer as described above,
Fully independent Kaminohechirui has fuel rods with different outer diameters.

A spring member is arranged in the space around the independent cell into which the spacer support rod is inserted, and thereby the fuel rod,
+j to press and support the spacer support rod and hollow rod;
By making it ¥-made, it is possible to attach fuel rods with different outer diameters, spacer support rods, and hollow rods to independent cells. It can be used for spacer support rods and metal assemblies that pass through hollow rods.

〔Effect of the invention〕

According to the present invention, the independent cell spacer is connected to fuel rods having different outer diameters, spacer support rods 3 and hollow casings;
V, which can be applied to fuel assemblies, is expected to increase the visibility of fuel installations and improve combustion characteristics and manufacturability. .

Fig. 1 stone 1ii3 simple d brother E force Fig. 1 V, overall view of the fuel assembly, Fig. 2 is a plan view of a round independent cell type spacer, Fig. 3 is an octagonal and vertical cell type spacer. FIG. 4A is a plan view of the implementation of the present invention in a round independent cell spacer, FIG. 4B is a vertical cross-sectional view of FIG. 4A, and FIG. FIG. 5B is a plan view of an embodiment of the present invention in a square independent cell spacer, FIG. 5B is a cross-sectional view of FIG. 5A, and FIG. FIG. 6B, a plan view of the embodiment of the present invention, is a longitudinal sectional view of FIG. 6A.

1... Upper tie plate, 2... Lower tie plate 1.3... S-Y-14... Fuel rod, 5...
Sube # support.

Nod, 6... Engaging protrusion, 7... Independent cell inner surface protrusion, 8... i, -plate bar, 9... Round independent cell, 1o
...Octagonal Dokdo Cell, 11...Length Iduba/Do, 12
. . . Large diameter spacer support rod, 13 . . . Spring member, 14 . . . Spring #'1b material protrusion.
, 7”−=−Representative Patent Attorney
Akio Tsutsumaki”, 7 1N, / Yu / Kunidai? Prisoner 3rd Maro 4th Ward (Ha) (8th Ho, 5 Kyo<B)

Claims (1)

[Claims] 1. In a surgical spacer where several fuel rods and hollow rods are assembled into a lattice of all the independent cells of a comb type, a spring member is arranged in the empty T & L between the independent cells, A fuel spacer characterized in that the spring member presses the fuel rod and/or the hollow rod to maintain an appropriate gap between the fuel rod and/or the hollow rod and the independent cell. 2. 'l'4 excuse h! In the fuel spacer according to item 1, a fuel spacer having different diameters is arranged in the space between the independent cells around the independent cells into which the hollow rods are inserted, By pressing the fuel rod and/or hollow rod with a diameter of 1 with this spring member, a 41rj structure is created that maintains an appropriate gap between the fuel rod and/or hollow rod and the independent cell. Fuel spacer with beef M pattern.