JPS59208494A - Spent fuel storage rack - 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] The present invention relates to a spent fuel storage rack provided in a spent fuel storage pool.

[Technical background of the invention]

Generally, spent fuel used in a nuclear power plant is transported to a reprocessing plant for reprocessing and is temporarily stored in a spent fuel storage pool.

1 and 2 show this spent fuel storage sol 1 and a spent fuel storage rack 2 provided at the bottom thereof.

The long spent fuel 3 transported in this spent fuel storage pool/1 is taken out from a spent fuel transport container (not shown) and divided into a large number (e.g. What kind of hollow container? Sketches) 4 (stored inside. After that, Sketches) 4Z are transported to the crane (
(not shown), is transferred through the pool water 6 of the spent fuel storage pool 1, and is suspended from above within the storage frame 2a formed in a lattice shape of the spent fuel storage rack 2. Oriented. As a result, the spent fuel 3 is stored in the spent fuel storage pool l〇This basket≠
has a square or rectangular cross section depending on the number of spent fuels 3 stored therein, and has a high height, so it is likely to fall over during an earthquake or when entering or exiting the spent fuel storage rack 2.

Therefore, beam parts 2b and xb are provided at the upper and lower parts of the spent fuel storage rack 2, respectively, to form a lattice-shaped storage frame 2a.
,,21L is formed to restrain the horizontal movement of the basket μ and prevent it from overturning. Since its horizontal movement is restrained by the upper and lower storage frames 2 a , . On the other hand, since the spent fuel 3 is contained in the nonosuke 14, in order to shield it from radiation, it is necessary to take out the basket without exposing it from the upper surface of the pool water 6.

Therefore, in order to handle these Nonoskets a7 without exposure to radiation, the required depth of the pool water t must be determined by the height of the spent fuel storage rack 2, the height of Nonoskets t, and the shielding water depth. It must be summed up.

In this way, the required depth of the pool water t becomes very deep, so the construction cost of the spent fuel storage sol l is high, and the pool water 2
The capacity of the sol water 6 also became very large, and large-sized equipment was required to cool and purify the sol water 6.

[Objective of the Invention] The present invention has been developed in view of these points, and it is possible to safely and easily perform the operation of entering and exiting the Nonosket (3) at shallow pool water depths, and An object of the present invention is to provide a spent fuel storage rack that can reduce the manufacturing cost of a spent fuel storage pool or the like.

[Summary of the invention]

In the spent fuel storage rack of the present invention, a plurality of support walls are arranged in parallel at intervals that allow baskets to be carried in and out horizontally movably, and the slotted fuel storage rack is provided at the upper end of the opposing surface of the adjacent support walls. An upper locking step is provided in which an upper flange formed at the upper part of the basket is inserted to prevent the horizontal movement of the nonosket, and at the lower part of the opposing surface, lower 7 flanges formed at the lower part of the basket are respectively connected to the support wall. The device is characterized in that it is formed with a guide groove that moves in and out in the lateral direction, and a lower locking stepped portion into which the lower flange is inserted to prevent horizontal movement of the nose socket.

[Embodiments of the invention]

Hereinafter, the present invention will be described with reference to the embodiments shown in FIG. 3 and FIG.

The basket /2 stored (≠) by the spent fuel storage rack l/ of this embodiment has j pieces of spent fuel 3.
3 is housed in a square cross section, and 7 langes In and /3b are protruded from the upper and lower parts of the entire circumference, respectively. This spent fuel storage rack// is formed by a plurality of supporting walls 1 and 1 fixed to the bottom surface/IL of the spent fuel storage pool 1. Adjacent support walls are provided at intervals T such that the basket can be moved horizontally as shown by the arrow in FIG. 3. That is, the υ interval T is formed to be larger than the width of the nonosket 12. Further, the upper end of the opposing surface of each support wall /44, /44 has an upper locking step portion into which the upper flange /3a of the Nono socket 12 is inserted to prevent the horizontal movement of the Nono socket /2. /3tL and /3a are provided facing each other. The upper locking steps /ja are arranged at predetermined intervals in the lateral direction of the support wall /4'. Also, each support wall/4
Nonosket 1 is placed at the bottom of the opposite side of C and /4', respectively.
2 bottom flange! 3'b is recessed to face guide grooves /A and /A through which the guide grooves /A and /A are moved in and out by moving in the lateral direction of the support wall /fig. A flange 13b below the slotted socket is inserted directly below the upper locking step part /ja of the guide grooves /A and /A, respectively, to form a lower lock that prevents the basket from moving in the horizontal direction. Stepped portions /3b, /3'F) are provided.Next, the basket /:l according to this embodiment is provided.
Storage Z will be explained.

First, the basket 12 is suspended by a hanging cable j, and the basket 12 is moved horizontally in the direction of the arrow in FIG. 3 using a crane or the like and stored. That is, as shown in Fig. µ, the basket 12 is suspended in the pool water 6 at a height where the flange 13b under the Nonosket/2 is in the middle position between the adjacent support wall/Hiro guide groove/6. Next, the flanges /3L, /3Y) are moved in parallel along the slotted guide holes 16 to the predetermined upper and lower locking steps /3tL, /3Y.
Stop it directly above 3b. After that, the suspension cable j is let out, and the d socket lunges /3L, /3b are attached to each locking step /! ;a, /Sb and is prevented from moving in the horizontal direction. As a result, dsket)/, 2 is stored in a fixed position at a predetermined position in the spent fuel storage rack/l.

On the other hand, the basket 12 is taken out in the exact opposite manner to the storage operation. In this case, the upper edge of the guide groove/A/
The height of Aa (figure 1) is set as follows: When lifting L, the lower flange 3b hits the upper edge 6IL, and the upper end of the holder 1 is above the water surface of the sol water 6. If it is formed at a height that does not protrude, radiation shielding by the pool water 6 will be reliably performed in the operation center.

Also, Nonosket l:1. Since it has a square cross section as shown in the figure, storage can be carried out without difficulty in the same way as described above even if the nomasket /:l is rotated by 0 degrees around the vertical axis.

In this way, in this embodiment, the respective flanges /3tL, /3b of Nono Suke)/2 are connected to the respective locking step portions 7ja, /jt.
Storage and removal are performed by hoisting the container to a small enough height to take it out from the container, and then moving it horizontally.

Therefore, the required depth of the pool water 6 is Nonosket 7.2.
height, lifting height of Nomasket 12 (7
) and the shielding water depth, which is much shallower than the required water depth in the conventional example.

〔Effect of the invention〕

In this way, the spent fuel storage rack of the present invention allows safe and easy access to the nonosket in which spent fuel is stored using shallow pool water, and also ensures horizontal restraint of the basket. This can prevent Nonosket from tipping over in the event of an earthquake, etc., and the depth of the pool water can be made shallow, allowing the volume of the spent fuel storage pool itself to be reduced, reducing costs. It has the effect of being cheaper.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a conventional spent fuel storage rack, FIG. 2 is a side view of the same, FIG. 3 is a plan view showing an embodiment of the spent fuel storage rack of the present invention, and FIG. It is a sectional view along the IV-IV line of a figure. ! ... Spent fuel storage pool, 3... Spent fuel,
cr) 6...pool water, l/...spent fuel storage rack,
/2... Nonosket, /3a, /3b... Flange, /伜... Supporting wall. /3a, /S'b...Locking step portion, 16...Guiding groove,
/Aa...upper edge. Applicant's agent Kiyoshi Inomata Figure 1 and b Benko = JP-A-59-208494 (4) L Figure 4

Claims (1)

[Scope of Claims] 1. In a spent fuel storage rack in which a plurality of spent fuels containing a plurality of spent fuels are stored in an upright arrangement in a spent fuel storage pool, the plurality of spent fuels are horizontally moved. A plurality of support walls are arranged in parallel at intervals that allow for free loading and unloading, and upper flanges formed on the upper part of the nonosket are inserted into the upper ends of the opposing surfaces of the adjacent support walls to form the nonosket. An upper locking step is provided at the bottom of the opposing surface to prevent the horizontal movement of the /? A guide groove formed at the bottom of the socket through which a lower flange enters and exits in the lateral direction of the support wall, and a lower locking step into which the lower 7 langes are inserted to prevent horizontal movement of the socket are provided. The height of the upper edge of the spent fuel storage rack 0 2 guide groove is such that when the 2 langes below the Nono Sket slam into this upper edge, the upper end of the Nono Sket is The spent fuel storage rack according to claim 1, wherein the spent fuel storage rack is formed at a height that is maintained below the surface of the pool water of the fuel storage pool.