JPS62140097A - Fuel storage device for nuclear reactor - 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 (Field of the Invention) The present invention relates to a spent atomic fuel 1'+1 storage chamber, and in particular to an apparatus for increasing the storage density of nuclear reactor fuel and significantly saving limited space. Reactor fuel that can be saved: (') 1゜〔Inventive techniques regarding storage devices ((, i back suspension and its problems) In recent years, used nuclear reactor fuel t![ has been directly reashed. What to do is sutra 21'
+ I = and Technology - Due to problems and other reasons, the need for long-term storage of nuclear reactor fuel is increasing.

Furthermore, regarding the storage of Iji Oji reactor fuel, a high-density reactor fuel storage system is desired from the viewpoint of economy and storage capacity ω.

The conventional high-density 1-kyoko furnace combustion paddy storage device, as shown in FIG. As shown in Figure 13! An I aggregate 90 is stored.

For further explanation of conventional nuclear reactor fuel storage devices, see Part 12.
In the figure, reference numeral 81 is an outer frame of the storage 80 having a substantially rectangular parallelepiped shape, and the inside of this outer frame ε31 is divided by a number of partition frames 82. The outside and inside of the outer frame 81 and the partition frame 8
A core P1 absorption plate (not shown) made of a neutron absorbing material is attached to 2. In the space formed by the outer frame 81 and the partition frame 82, rectangular tubes 83 are arranged at regular intervals, and a water gap 85 is formed between the rectangular tubes 83 and the eight tubes 83. A fuel assembly 90 as shown in FIG. 13 is housed in its entirety within the rectangular tube 83 of the storage tank 80 shown in FIG. 12 constructed in this manner. 1st
In FIG. 3, a fuel assembly 90i includes a large number of burning rods 9.
6 to spacer 95, upper quiblet t-92iJ3 J
, and the lower tie plate 93 (J) are tied together to form a fuel bundle, and this fuel bundle is housed in the tunnel box 91 to form the U. A handle 94 is attached to a part of the fuel bundle. FIG. 14 shows the fuel rods in the fuel assembly 90 shown in FIG. 13. The fuel rods 964 are arranged in the tunnel box 91 at a distance ρ2 which is better than the outer diameter ρ of the fuel rod 96. Also, the inner dimension d of the rectangular tube 83 is The outer dimensions of the flannel box 91 are approximately the same.

However, in such a conventional arrangement rI, a water gap 85 for injecting water is provided between the rectangular tubes 83 in order to suppress the neutron increase effect and store neutrons in a subcritical state. Therefore, the distance between the rectangular tubes 83 that house the fuel assembly 90 increases. Furthermore, since the fuel rods 96 are arranged at predetermined intervals as shown in FIG. 14 within the fuel assembly 90, the fuel rods 96
The channel box 91 and square tube 83 are required to be larger than those in the case where the tubes 6 are closely arranged. Therefore, as shown in FIG. 12, the overall shape of the conventional nuclear reactor fuel storage system, which consists of a storage chamber 80 with square tubes 83 inside and a water gap 85 formed between the square tubes 83, is This poses a problem in that it becomes large and takes up a large amount of storage space.

[Purpose of the invention]

The present invention has been made in consideration of these points,
It is an object of the present invention to provide a reactor fuel storage system r1 that can increase the storage density of nuclear fuel, reduce the storage space, and perform safe storage management.

[Summary of the invention]

The present invention provides a storage box comprising an outer frame having a space inside and covered with a medium absorbent material on the outside, and a hollow storage tube disposed in close contact with the space; A nuclear reactor fuel storage device consists of a hollow cylindrical container made of a neutron absorbing material housed in a cylinder and having reactor fuel rods arranged inside it.

According to the present invention, is it possible to dismantle and take out the spent fuel gimme 1 assembly? ! Two or more fuel rods can be arranged densely in a container, and this container can be stored tightly in a storage cylinder in a storage warehouse, so the shape of the reactor fuel storage device can be made smaller and storage is easier. You can make the space smaller. In addition, since the container is made of a neutron absorbing material and the outside of the outer frame is covered with a neutron absorbing plate, it is possible to safely store the fuel in a subcritical state. ] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 5 are diagrams showing an embodiment of the reactor fuel storage space according to the present invention.
is the main storage area for nuclear reactor fuel storage.

The storage 10 has an outer frame 11 and an outer frame 11 with a space formed inside.
A hollow kl that is placed close to the internal space! The storage tube 12 is composed of two compartments, and a container 15 is stored inside the storage cylinder 12. This outer frame 11 has a substantially cubic shape, and the inside of this outer frame 11 is partitioned into four spaces by a partition frame 13, and these four spaces are divided into three consecutive regular square cylindrical storage cylinders 12a. A3 and a long rectangular cylindrical li- storage cylinder 12b are provided.The outside of the outer frame 11 is made of, for example, stainless steel, boron-added stainless steel, or boron-added aluminum!14 (boral plate). The manufactured neutron absorption plate 14 is removed to cover the outer frame 11.

A plurality of cylindrical containers 15 are stored in a densely arranged state inside a storage tube 12 in a storage 10.

A burning rod 18 is placed inside this container 15.

This container 15 will be explained in detail in FIGS. 2 and 3.

FIG. 2 is a perspective view showing an example of a hollow cylindrical container 15 made of a neutron absorbing material. A handle 16 is attached to the top of the container 15, so that the container 15 can be moved using a crane or the like. Note that a lid (not shown) may be attached to the top of this storage container. 3 is a plan view of C7:M'r'I 5 in FIG. 2. In FIG. T:1 dedication.

. Next, such as
At 5th d3, the fuel rod 18 is placed in the container 15, and the fuel rod 18 is placed in the container 15.
5 in the storage tube 12 will be explained.

The fuel rods 18 of the 5th modification are taken out by disassembling the used collapsed and burnt-out oblique assembly (not shown) of multiple J and V fuel rods. Next, as shown in FIG. 4, the 1':1 fuels 18 are densely arranged in a square grid in the container 15. In FIG. 4, the fuel rods 18 are arranged at intervals 91 of approximately the same length as the outer diameter 9 of the fuel rods 18. Next, as shown in Figure 5, J: Sea urchin, 1 stick burned inside.
Containers 15 containing 8 are densely stored in a square lattice shape in a storage cylinder 12 of a storage. In Figure 5, Yong i! ! i1
5 is housed at an interval [1] of approximately the same length as the outer diameter of the container 15.

As described above, according to the present invention, the fuel rods 18 can be installed in the container 15 at a distance of 1 m, which is approximately the same as the outer diameter p of the fuel rod 18, and at intervals of f11. can be stored and covered within the storage cylinder 12 at intervals of a distance L1 that is approximately the same as the outer diameter of the container 15. Therefore, conventional reactor fuel
≧1 storage device, the fuel rods 96 are placed in a tunnel box 9 at intervals of a distance p2 longer than the outer diameter 1 of the fuel rods 96.
The reactor fuel storage device according to the present invention is more advantageous than the case where the rectangular tubes 83 that house the channel box 91 are arranged at a predetermined distance d5 from each other to form a water gap 85. The shape can be made smaller,
Storage space can be reduced.

Furthermore, if the fuel rods 18 are placed in the container 15 close to the phase η, there is a possibility that the fuel in the container 15 (+818) will be in a critical state. Since the neutron absorption plate is attached to the outside of the outer frame 11 of 10, the fuel rods 18 inside the container 15
can be stored in a subcritical state.

Figures 6A and 6B are plan views of another embodiment 191 of a storage for a nuclear reactor fuel storage system according to the present invention.

A second implementation IZI of storage Jili' is shown in FIG. 6A.

No. 20 (marked 43 in the △ figure) has a cylindrical 3
The storage is made up of an outer frame 21 with two storage cylinders 22 on the right side, and a neutron absorption plate 24 attached to the outside of the outer frame 21. Inside this storage tube 22, a storage tube is stored. Further, FIG. 6B shows a third embodiment of the storage. In Fig. 6B, there is a regular hexagon i inside.
An outer frame 26 having a large number of j1-shaped storage tubes 27, and an outer frame 26
This storage is comprised of a neutron absorption plate 29 installed on the outside. I6: Containers should be stored inside warehouse 25.

Next, Fig. 7Δ, Fig. 713, Fig. 7C, Fig. 8△, Fig. 8
Figures B and 8C show other embodiments of the container for the reactor fuel storage device according to the present invention.

The 7th delta figure is: The second fruit of the citrus fruit/! i iZl - Perspective view (・Yes, 8th Δ is its plan view 1, 7th Δ
13J: and J3 in FIG. and FIG. 8B is a plan view thereof. FIGS. 7B and 81
In FIG. 3, reference numeral 33 is a regular hexagonal cylindrical container made of a neutron absorbing material. FIG. 7C is a perspective view showing a fourth embodiment of the container, and FIG. 8C is a plan view thereof. In FIGS. 7C and 8C, reference numeral 13 and 35 indicate an equilateral triangular cylindrical container made of a neutron absorbing material.

In each of these embodiments (the top of the container has a handle 32)
．． 34 and 36 are attached respectively.

Further, FIGS. 9A, 9B, 9C, and 9D are plan views showing embodiments of the vessel pond of the nuclear reactor fuel storage device according to the present invention. At J3 in FIG. 9A, the inside of a cylindrical container 41 made of a neutron absorbing material is partitioned by a partition plate 42 made of a neutron absorbing material. By partitioning the inside of the container 15 with the partition plate 42 made of a neutron absorbing material in this way, it is possible to further suppress the fuel rods (not shown) inside the container 41 to a subcritical state. In Figure 9B, Figure 9C, and Figure 9D, the volume made of neutron absorbing material is 42,4
5. The inside of 47 is made of neutron absorbing material Case 1,1
) + anti-44, 46, 47 and J.

In the embodiment described below, the fuel rods are densely arranged in a square grid in the container. ! [! In addition, as shown in FIG. 10, a plurality of fuel rods 18 may be arranged densely in a triangular lattice shape within the container 15.

In addition, in the embodiment described above, an example was shown in which cylindrical containers 15 are densely stored in a square grid pattern in the storage tube 12 of the storage as shown in FIG. 5, but other storage examples are described below. show. That is, in FIG. 118, a square cylindrical container 51 is closely housed in a storage cylinder 12 of a storage. J: In FIG. 11B, a regular hexagonal cylindrical container 53
are closely stored in the storage tube 12 of the storage J1ft. Further, as shown in FIG. 11C, a cylindrical container 55 is housed in a triangular tube shape in the storage cylinder 12 of the storage box at J3.

Further, in FIG. 11D, a square cylindrical container 57 partitioned by a partition plate 58 made of a neutron absorbing material is closely housed in the storage cylinder 12 of the storage. In addition, in FIG. 11E, a regular hexagonal cylindrical container 59 partitioned by a partition plate 60 made of a neutron absorbing material is closely placed inside a storage cylinder 12 in which a plurality of fuel rods, which have been taken out by disassembling a diagonal assembly, are placed. The reactor fuel storage device according to the present invention can be densely arranged in a container, and this container can be densely stored in a storage cylinder of a storage warehouse. This allows the storage space to be reduced. In addition, the container is made of neutron absorbing material (-), and a neutron absorbing plate is attached to the outside of the outer frame, so fuel rods can be stored for 1 J' in a subcritical state.
It can be stored for a long time and safely.

[Brief explanation of drawings]

Figures 1 to 5 show the present invention's J:1K reactor fuel storage.
FIG. 1 is a plan view showing the storage, FIG. 2 is a perspective view showing the container, and FIG. 3 is a view of FIG. Fig. 4 is a plan view showing the case where fuel rods are arranged in a square grid in the container, Fig. 5 is a plan view showing the case in which the containers are arranged in a square grid in the storage cylinder, and Fig. 6 Figures 6B and 6B are plan views showing examples of storage racks, Figures 7Δ, 78J3 and 7C.
The figure is a perspective view without showing other embodiments of the container, and FIG. 8A,
Figures 8B and 8C are the plan views, Figures 9A and 9
Figures B, 9CN and 9D are plan views showing the case where the container is provided with a partition plate, and Figure 10 is a plan view showing the case where the fuel rods are arranged in a triangular lattice shape in the container. 11A, a plan view showing the case where the
Figures 11B, 11C, 11D, and 11E are plan views showing a case in which containers are placed in storage cylinders of a storage unit, and Figure 12 is a plan view showing a storage unit of a conventional device. 13
The figure is a perspective view showing a fuel assembly of a conventional device m, and FIG. 14 is a plan view showing the arrangement positions of fuel rods of the fuel assembly of a conventional device. DESCRIPTION OF SYMBOLS 10... Storage, 11... Outer frame, 12... Storage tube, 13... Partition frame, 14... Neutron absorption plate, 15...
... Container, 18... Fuel rod, 20... Storage 11F,
2... Outer frame, 22... Storage tube, 24... Neutron absorption plate, 25... Storage, 26... Outer frame, 27...
・Storage cylinder, 29...Neutron absorption plate, 31.33.35
, 41, 43. 45. 47... Container, 51, 53.5
5.57.59... Container, 5B. 60... Partition plate. Applicant's agent νj'fi1. - Stalen 1 Figure 2 Figure 4 % 65 Figure 8A Figure 88 Figure 8c Figure 9A Figure 9B Figure 9c Figure 9D Figure 30 Figure 22A Day 5 Figure nc Figure 11D Figure 17E Figure 12 Figure 13 ○○OQ ○O○○ Figure 14

Claims (1)

[Scope of Claims] 1. A storage consisting of an outer frame having a space inside and covered with a neutron absorbing material on the outside, and a hollow storage cylinder provided in close contact within the space; A nuclear reactor fuel storage device comprising: a hollow cylindrical container made of a neutron absorbing material that is housed in a cylinder and has reactor fuel rods arranged therein; 2. The reactor fuel storage device according to claim 1, wherein the outer frame has a substantially cubic shape. 3. The reactor fuel storage device according to claim 1, characterized in that a partition frame is attached inside the outer frame. 4. The reactor fuel storage device according to claim 1, wherein the storage cylinder has a cylindrical shape. 5. The reactor fuel storage device according to claim 1, wherein the storage cylinder has a polygonal cylindrical shape. 6. The reactor fuel storage device according to claim 1, wherein a partition plate made of a neutron absorbing material is attached to the inside of the container.