JP2006220485A - Radioactive material storage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radioactive material storage occupying a reduced space. <P>SOLUTION: The radioactive material storage comprises a rectangular parallelepiped basket having a grip member 5 provided on one of opposing outer faces and a grip member 6 provided on the other of the opposing outer faces for storing a radioactive material, a plurality of storage spaces 15 each having a passage 14 on which the basket 1 is moved horizontally, a guide member 16 for guiding the basket 1 to a storage position and a support member 17 for supporting a supporting object member 6 of the basket 1 for storing the baskets 1 with specified intervals, and a crane 21 installed above the passage 14 and the storage spaces 15 for gripping the grip member 5 of the basket 1, lifting the basket 1 to a height allowing transfer of the basket 1 and horizontally transferring the basket 1. The space formed above the passage 14 and the storage space 15 has sizes allowing horizontal movement of the crane 21. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a storage chamber for radioactive material.

  Conventionally, a vertical loading system has been used in the storage chamber of a fuel assembly, which is one of the radioactive materials, and is surrounded by a thick concrete wall surface, into a long storage pit formed in a vertical direction, from above. The fuel assemblies were inserted one by one. Specifically, a crane that moves the fuel assemblies in the vertical direction is used when the fuel assemblies are stored in the storage pits and taken out from the storage pits.

JP 7-215664 A Japanese Patent Laid-Open No. 10-246796

  In the conventional fuel assembly storage chamber, the fuel assembly is stored and taken out using a crane that moves the fuel assembly in the vertical direction. Therefore, at least the height of the fuel assembly is at least the height. It was necessary to secure above the storage pit, and a considerably large space was required above the storage pit.

  Moreover, the storage pit itself is formed in a rectangular parallelepiped shape with a square cross section, but the storage pit insertion port is sealed by a stepped cylindrical plug to prevent radiation leakage. The storage pit insertion port The plug that seals out requires a much larger area than the required area of the storage pit itself. Therefore, it is difficult to increase the installation density of the storage pits, and the space of the fuel assembly storage chamber is made larger than necessary.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a radioactive substance storage chamber capable of saving space.

The radioactive substance storage chamber according to the first invention for solving the above-mentioned problems is
A basket having a gripping function to be gripped at the time of movement and a supported function to be supported at the time of fixing, and containing a radioactive substance;
At least one passage through which the basket is moved horizontally;
A storage space for storing the basket by a support function that is provided in a plurality along the passage and supports the supported function of the basket;
A lifting device that is disposed above the passage and the plurality of storage spaces and lifts the basket to a movable height by a gripping function of gripping a gripped function of the basket, and horizontally moves the basket.
The space provided above the passage and the plurality of storage spaces is sized so that the lifting device itself can move horizontally.

A radioactive substance storage chamber according to a second invention for solving the above-mentioned problems is as follows.
In the radioactive substance storage chamber described in the first invention,
The basket stores a plurality of radioactive substances, has the gripping function on one opposing outer surface, and has the supported function on the other opposing outer surface.

A radioactive substance storage chamber according to a third aspect of the present invention for solving the above-described problem is provided.
In the radioactive substance storage chamber according to the first or second invention,
The storage space is provided with a guide function for guiding the basket to a storage position.

A radioactive substance storage chamber according to a fourth aspect of the present invention for solving the above-described problem is provided.
In the radioactive substance storage chamber according to any one of the first to third inventions,
The supported function and the support function are a support structure including an insertion hole and a guide pin.

  According to the present invention, the necessary space of the radioactive substance storage room can be made as small as possible. As a result, the building of the radioactive substance storage room can be made smaller and the construction cost can be reduced.

  The storage chamber of the radioactive substance (fuel assembly) according to the present invention will be described in detail with reference to FIGS. Here, a description will be given using a fuel assembly as an example of a radioactive substance.

  The fuel assembly, which is one of the radioactive materials, may be uranium fuel, but may be MOX fuel (mixed oxide fuel, mixed-oxide) regenerated from plutonium extracted from spent uranium, or radioactive waste. .

FIG. 1 is a perspective view showing a basket used in a storage chamber for a radioactive substance (fuel assembly) according to the present invention.
As shown in FIG. 1, a basket 1 for housing a fuel assembly is composed of a rectangular parallelepiped box-shaped box member 2 having a bottom plate, and a box member 2 having a square section made of stainless steel is divided into four parts by two partition plates 3. The container 4 is divided and provided with the accommodating portions 4 having four square cross sections. The fuel assemblies can be efficiently transported in a short time by inserting the fuel assemblies into the storage portions 4 and storing them. Further, the fuel assembly can be protected by the basket 1 during transportation and storage.

  A gripped member 5 (a gripping function) that is gripped when the basket 1 is moved is provided on an upper portion of one of the opposing outer surfaces of the basket 1. A disc-shaped anchoring member 5a is provided so that the hook 25 (gripping function, see FIG. 3) for gripping the member 5 to be gripped does not come off. In addition, a supported member 6 (supported function) that is supported when the basket 1 is fixed is provided on an upper portion of the other outer surface of the basket 1, which is provided on the supported member 6. A guide pin 18b of a support member 18 (support function) described later is inserted into the insertion hole 6a, and the horizontal position of the basket 1 is fixed. That is, the horizontal position of the basket 1 is supported and fixed by the pin-hole support structure of the insertion hole 6a and the guide pin 18b. Further, a cylindrical columnar member 7 is provided on the bottom surface of the basket 1, and the columnar member 7 is fitted into a guide hole 17 described later to position the basket 1. The supported member 6 and the support member 18 are not limited to the pin-hole support structure as long as they have a support function.

  Although the partition plate 3 is illustrated in a simplified manner in FIG. 1, the partition plate 3 has an appropriate thickness and gap so that the fuel assemblies accommodated in the accommodating portion 4 maintain a predetermined interval. is there. Further, the constituent materials of the box member 2 and the partition plate 3 are not limited to stainless steel, and may be configured using stainless steel added with boron (B) for neutron absorption or other metal materials. Further, in FIG. 1, a basket for storing four fuel assemblies for PWR (Pressurized Water Light Water Reactor) is shown, but a basket for storing fuel assemblies for BWR (Boiling Water Light Water Reactor) may be used. In that case, 16 fuel assemblies are accommodated in one basket.

  Next, the storage chamber for the radioactive substance (fuel assembly) according to the present invention will be described with reference to FIGS. Here, FIG. 2 is a top view of the storage chamber of the radioactive substance (fuel assembly) according to the present invention, and FIG. 3 is a view taken along the line AA in FIG.

  As shown in FIG. 2 and FIG. 3, the radioactive substance (fuel assembly) storage chamber 10 according to the present invention is entirely surrounded by a concrete wall 11 having a predetermined thickness. The storage chamber 10 is provided with a carry-in / out opening 12 for carrying in and out the basket 1 described above, and only when the basket 1 is carried in / out, the carry-in / out door 12a (see FIG. 5) described later is opened. It has become.

  The interior of the storage chamber 10 is separated into a plurality of spaces by a plurality of separation walls 13, and a passage 14 for horizontally moving the basket 1 is provided in each space. A plurality of storage spaces 15 for storing the basket 1 are arranged along the passages 14. The separation wall 13 is not limited to the separation structure and the wall as long as it has a support function.

  The storage space 15 is provided on the inner wall surface of the storage space 15, is provided on the floor surface 11 b and a guide member 16 (guide function) that guides the side surface of the basket 1 and guides the basket 1 to the storage space 15. 1 and a support member 18 (support function) having a pin support member 18a provided on the inner wall surface of the storage space 15 and a guide pin 18b erected on the pin support member 18a. The basket 1 is fixed at a predetermined position by inserting the guide pin 18b into the insertion hole 6a. The storage spaces 15 are respectively arranged at predetermined distances that can ensure the subcriticality of the fuel assembly, whereby the basket 1 is stored at predetermined intervals. In the conventional vertical loading method, in order to reduce radiation leakage from the pit lid, a distance between pits larger than the subcritical collateral distance is necessary. The criticality guarantee distance is short, and this increases the number of baskets 1 that can be arranged per unit area, thereby saving space.

  Next, the crane (lifting device) used in the storage chamber for the radioactive substance (fuel assembly) according to the present invention will be described with reference to FIGS. FIG. 4 is a top view showing the crane above the storage chamber of the radioactive substance (fuel assembly) according to the present invention.

  As shown in FIGS. 3 and 4, the wall surface 11 of the storage chamber 10 is provided with a protruding portion 11 a that protrudes along the passage 14 in the vicinity of the upper portion of the storage space 15 on both opposing wall surfaces 11. A rail 20 parallel to the passage 14 is provided on the upper surface of the portion 11a. On the rail 20, the 1st mobile body 22 which comprises the crane 21 is arrange | positioned, and it can move horizontally on the rail 20 with the wheel 22a. In addition, a second moving body 23 is disposed on the first moving body 22, and on the rail 24 provided on the first moving body 22 in the length direction of the first moving body 22 by wheels 23 a. It can move horizontally. That is, the crane 21 that can move horizontally in the space above the passage 14 and the storage space 15 is arranged.

  The second moving body 23 is provided with a suspending member 25 that suspends a gripping member 26 (gripping function), and a moving space 27 in which the suspending member 25 can move is provided at the center of the first moving body 22. Is formed. The suspension member 25 is provided with two J-shaped grasping members 26 (hooks). The grasping member 5 is grasped by the grasping member 26 and the suspension member 24 is moved vertically upward. The basket 1 moves away from the floor 11b of the storage room and can move horizontally. At this time, the basket 1 is horizontally moved in the X direction by the movement of the second moving body 23, and is horizontally moved in the Y direction by the movement of the first moving body 22 to the desired storage space 15. Moved. When the basket 1 moves to a predetermined position in the storage space 15 by the guide member 16, the suspension member 25 moves vertically downward, the columnar member 7 is inserted into the guide hole 17, and the guide pin 18b is supported by the supported member. 6 is inserted into the insertion hole 6a to fix the position of the basket 1, and then the gripped member 5 is released from the two gripping members 26, and the operation ends.

  Although the crane 21 moves the basket 1 in the vertical direction, the basket 1 needs to be slightly separated from the floor surface 11b of the storage chamber 10 so that it can move horizontally. The size of the space in which the crane 21 itself can move is sufficient, and space can be saved in the height direction as compared with a conventional vertical storage type crane. The crane 21 in the storage room 10 is unmanned for safety. However, the crane itself is generally used, has high operation reliability, and is easily designed as desired. Is possible.

FIG. 5 is a view showing the surrounding facilities including the storage room for the radioactive material (fuel assembly) according to the present invention.
As described above, the basket 1 that stores a plurality of fuel assemblies is moved horizontally in the storage chamber 10 using the crane 21, and is loaded into the storage chamber 10 and unloaded from the storage chamber 10. Also, the loading / unloading door 12a is opened and moved horizontally using the crane 21. The basket 1 carried out of the storage room 10 is shipped and inspected and then lifted by the overhead crane 30 and inserted into the cask 33 installed on the lid mounting device 32 of the packing room 30 together with the basket 1. Is done. As described above, the basket 1 for storing the fuel assembly is used for moving and storing the fuel assembly, and can also be used for transportation together with the cask 33 described later. The basket 1 is loaded on the cask 33 from the vertical direction. However, since the fuel assembly is accommodated in the basket 1, the basket 1 can be loaded on the cask 33 from the horizontal direction.

  After a plurality of baskets 1 are inserted into the cask 33, a lid is attached to the cask 33, and the cask 33 is lifted by the overhead crane 31 again, moved to the cask operation room 40, and installed on the cask rollover device 41 ( 41a) in the figure. The cask 33 erected on the cask rollover device 41 is rolled over by the cask rollover device 41 (41b in the figure) and temporarily stored in a horizontal state until shipped.

  In the radioactive substance storage chamber according to the present invention, uranium fuel, MOX fuel, radioactive waste and the like are suitable as the radioactive substance.

It is a perspective view which shows the basket used in the storage chamber of the radioactive substance which concerns on this invention. It is a top view of the storage chamber of the radioactive substance which concerns on this invention. It is an AA arrow directional view of FIG. It is a top view which shows the crane above the storage chamber of the radioactive substance which concerns on this invention. It is the figure which showed the surrounding facilities including the storage room of the radioactive substance which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Basket 5 To-be-gripped member 6 To-be-supported member 10 Storage chamber 14 Passage 15 Storage space 16 Guide member 17 Guide hole 18 Support member 21 Crane 25 Gripping member (hook)
30 Packing room 40 Cask operation room

Claims (4)

A basket having a gripping function to be gripped at the time of movement and a supported function to be supported at the time of fixing, and containing a radioactive substance;
At least one passage through which the basket is moved horizontally;
A storage space for storing the basket by a support function that is provided in a plurality along the passage and supports the supported function of the basket;
A lifting device that is disposed above the passage and the plurality of storage spaces and lifts the basket to a movable height by a gripping function of gripping a gripped function of the basket, and horizontally moves the basket.
A radioactive substance storage chamber characterized in that a space provided above the passage and the plurality of storage spaces is sized so that the lifting device itself can move horizontally. The radioactive substance storage chamber according to claim 1,
The basket contains a plurality of radioactive substances, has the gripping function on one opposing outer surface, and has the supported function on the other opposing outer surface. Storage room. In the radioactive substance storage chamber according to claim 1 or 2,
A radioactive substance storage chamber, wherein the storage space is provided with a guide function for guiding the basket to a storage position. The radioactive substance storage chamber according to any one of claims 1 to 3,
A radioactive substance storage chamber, wherein the supported function and the supporting function are a supporting structure including an insertion hole and a guide pin.

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