JPS6182197A - Spent fuel pool - 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 [Technical Field of the Invention 1] The present invention (relating to a spent blast pool in a nuclear power plant A).

[Technical use of inventions and their problems] 1ζ17) l- and use: 14; Go! ! l'1-f-
11J: Sea urchin (111 made in C color) is shown in Figure 12.

1, 1 at the bottom of pool 1, 11 for Ltk river
A fuel 1:1 rack 2 is provided to accommodate the combined bundle, and water 3 is stored in the boule to shield the radiation. In order to allow the assembly to move within the pool underwater, the distance PIt from the top of the rack 'j: 4 to the free water surface 5 is set to the length J: sb of one assembly.Therefore, the fuel The suspension of free water on one side of Rack and Lee 1 becomes a person, causing sloshing during an earthquake, and water containing radioactive materials 71 flows out (there are 13 each).

[Objective of the Invention 1] The present invention has been made based on the above-mentioned circumstances, and its purpose is to eliminate the TF3 (heavy spent fuel boule) that prevents sloshing during an earthquake.

[Summary of the Invention] Use of the present invention: The old combustion 1° F1 boule is made by arranging in place a slosh suppressing combustion TRI rack which is provided with a member that prevents the horizontal flow of water at the upper end of the 141:H1 chic. Ql
i? Set it to 2.

1 Komyo Example 1 Are the same parts as in Figure 12 the same? , ] Figure 1 with father-in-law (
This figure shows J3
Then, I randomly divided some of them in the fuel rack.
As shown in Figure 6, another strategy rack J: Raise Richi Blue to suppress sloshing! ! 5 M'l rack binding C is available.

J
'3 [Earthquake 11, free water surface 5] Waves are generated, and the horizontal flow of water is obstructed, causing sloshing. A vortex is generated below the fuel rack for the fuel rack, and the J energy is defeated, so that the growth of sloshing is suppressed.

FIGS. 2 and 3 show how the present invention can prevent sloshing.
We accept details of fuel racks for ll. Figure 2 shows:
The fuel v1 rack 6 for suppressing sloshing has a small hole 7 in the side wall of the rack in the part that protrudes from the upper end 4 of the normal fuel rack 2, and the one shown in FIG. 3 has a slit 8 in the side wall. It is something.

The number of these small holes and slits, i.e., the total opening area, their arrangement, etc., have a significant effect on suppressing sloshing.
Therefore, the total opening area and arrangement of the cages are determined by measurements or experiments.

The same parts as in Fig. 1 are marked with -f:i number 4th item 1t.
The second fruit of the present invention III! Here is an example. In this embodiment, the fuel rack for suppressing sloshing 11 has one side wall of the conventional salt rack protruding in the <1 direction as shown in FIG. hand(
14 have been completed. The racks 6 for suppressing sloshing are arranged so that the protruding side walls 5) are not all oriented in the same direction. Further, the compensation, the direction of the protruding side wall 9, etc. are appropriately selected depending on the planar shape of the pool, etc. In this implementation 1, the outstanding ff! II ￥M exists in 3 different directions, so from which direction is iI! ! Even if seismic waves come in, the sloshing suppression effect can be reduced by 1''I.

FIG. 5 shows a third embodiment of the present invention. In this embodiment, a partition wall 10 projecting upward from the side wall is provided in a normal fuel rack 2 to prevent sloshing. +14. The direction of the protruding partition wall is the same as that of the protruding side wall 9 of the above embodiment. In this embodiment as well, the sloshing suppressing effect can be obtained no matter which direction seismic waves enter. .

FIG. 6 shows a fourth embodiment of the invention. In this embodiment, a fuel rack for suppressing sloshing is formed by providing a wall 11 having a cross-shaped cross section and projecting upward from the side wall. This embodiment also provides the same effects as those of the previous embodiments.

In the embodiment shown in FIGS. 3 to 6, the fuel 1'
Avoid passing 1 set 1 ho through slit-8, or the protruding side! i? 9. fl cut ril 0.11 near 1/'62
Passage c: The upper end 4 of burning 1 rack
Since the top of the free water surface 5 can be moved, it is necessary to keep a large distance between the upper end of the protruding side wall 9, the mouth end of the partition wall 10, 11", etc. and the free water surface 5. It can also be terminated in a shallow position or protruded above the water surface to improve squirrel [kossing suppression AI!J!].

FIG. 7 (, L) shows a fifth embodiment of the present invention, in which the same parts as those in FIGS. 1711 A sloshing suppressing fuel rack 6 is formed by providing a support 12 projecting upward from the upper end of the side wall in one rack.An appropriate number of sloshing suppressing fuel racks 6 having the structure t; In this embodiment as well, t112 obstructs the flow of water in the horizontal direction, resulting in a sweeping effect from I'11 to I'L.

The 8131st accepts +112;1'T 9111.

l: The outer shape of the lower half 12XI of 12 is I,'! i I'
↑ Risa l with that of +J° combination. If you do this, you can easily attach the pillar 12 to the fuel rack by inserting 1' below 1112 into the four parts of the DS 'l'Nl rack for housing the mold 1 east combination. It can be carried out. The upper half 121 of (112) is shaped like a plate whose direction is aligned with the diagonal line of the cross section of the lower half, and when placed in the fuel rack δ, 1 ['i means that the direction of the upper half of the plate is all The second and third fruits/Jl make sure they don't move in the same direction! !
The protruding side wall 9, 1.1 of the example is similar to the sword 10. By arranging it as above, seismic waves can be generated from any direction by sloshing InI a'il+
Effect 1′? Don't worry about things.

Various modifications can be made to the shape of t112. As shown in FIG. 9, the entire cross section may be approximately square. Also,
As shown in FIG. 10, there is a small hole 1 in the plate-like upper part 121
3, and the sloshing 1rlI2ilI effect can be set appropriately. Roughly speaking, as shown in FIG. Sloshing suppression effect 1111 against seismic waves from any direction It is difficult to use the Song 1r [Invention 9) + 372], it is clear from the i book 4
If J3 is in pool J3, the growth of sloshing during an earthquake will be suppressed, so there is no risk of water containing radioactive material Y1 flowing out of the pool, and this will improve the safety management of the Harajuku Power Plant. It is extremely right-aligned.

[Brief explanation of the drawing]

FIG. 1 shows a diagonal 31 diagram and a 2r4 diagram of the first embodiment of the present invention.
3 is a perspective view of a modified example of the main part, FIG. 4 is a perspective view of the second embodiment, FIG. 5 is a perspective view of the third embodiment, and FIG. The figure is a perspective view of the fourth embodiment, FIG. 7 is a perspective view of the fifth embodiment, FIG. 53 is a perspective view of the main part of 6, and FIGS. FIG. 12 is a perspective view of a conventional waste fuel pool. 1...7'-rule 2...fuel I'H1 3
...! Iζ 4...
” 2 q consent 5...freedom 71<and 6...su[]tsushi restraint'twist: r! 1 Rack 9 to 8 Fig. 9 Fig. 12 Fig. 7. Contents of the amendment Correction J) (Method) 6.0.2.21 Showa year
time

Claims (1)

[Claims] A spent fuel pool characterized in that a sloshing suppressing fuel rack is disposed at an appropriate location, and the upper end of the fuel rack is provided with a member that obstructs the horizontal flow of water.