JP2019039717A - Radioactive material-containing waste storage container - Google Patents

Abstract

To provide a radioactive material-containing waste storage container that has an excellent resistance to impact from falling and a high sealing property.SOLUTION: A radioactive material-containing waste storage container 1 includes: an inside container 30 for storing a radioactive material-containing waste; an outside container 10, in which the inside container 30 is arranged; and a filler 50 filled between the inside container 30 and the outside container 10. As the filler 50, at least one of a wave-like metal plate 51, an air bubble paste 52, a resin foam 53, and an elastic body 54 is selected, and the filler 50 is less stronger than the inside container 30 and the outside container 10.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a radioactive substance-containing waste container for containing radioactive substance-containing waste.

Due to the accident at the Fukushima Daiichi Nuclear Power Station caused by the Great East Japan Earthquake, contaminated water staying in the reactor building is being treated by multiple purification facilities including multi-nuclide removal facilities. To date, all purification processes for highly contaminated water containing strontium, excluding the water remaining at the bottom of the storage tank, have been completed.
Used adsorbents and precipitation products generated from the multi-nuclide removal equipment when treating contaminated water are stored in a high-performance container made of polyethylene (hereinafter referred to as HIC). . In the future, it will be necessary to treat and dispose of radioactive material-containing waste generated from work toward decommissioning in parallel with some contaminated water treatment.
The form and storage of these radioactive material-containing wastes are currently undecided, but contain radioactive material-containing wastes that can be stably stored and stored in various environments with specifications different from polyethylene HIC. If there is a container (hereinafter referred to as a storage container), the range of processing and disposal methods will be widened.

Conventionally, a concrete container has been used to accommodate radioactive material-containing waste.
For example, Patent Document 1 discloses a radioactive substance-containing waste container including an inner can that contains radioactive substance-containing waste, and a metal outer can that is filled with the inner can and sealed. Have been described. The inner can is added to cement, a powdery or spherical small steel ball group having an average particle diameter of 100 to 250 μm added in a weight ratio of 1 to 4 to the cement, and a weight ratio of 1 to 4 in the cement. And a powdery or spherical large steel ball group having an average particle diameter of 600 to 850 μm, and is composed of radiation shielding concrete having a density after curing of 4.0 g / cm ³ or more. This container has a two-layer structure consisting of an inner can and an outer can. The inner can has a high density and the small steel balls and the large steel balls are uniformly distributed. it can.

As a concrete material, steel fiber reinforced polymer impregnated concrete (hereinafter referred to as SFPIC) is known.
SFPIC is obtained by impregnating and polymerizing the pores of steel fiber reinforced concrete, and is excellent in airtightness compared with ordinary concrete. Therefore, the container made of SFPIC can prevent leakage to the outside even when a substance having deliquescence is housed inside. In addition, SFPIC is known to have higher strength than normal concrete, and the concrete used as a base material is an inorganic material and thus has a characteristic that it is chemically stable.

JP 2009-276194 A

Since the container is lifted by the crane in the process of transporting, the container may fall during transport. Moreover, since a container may be piled up vertically at the time of conveyance and storage, there exists a possibility of falling to the ground. If the storage container falls and an external force is applied to the storage container due to the impact, the storage container is damaged or broken, and the sealing property cannot be maintained, the radioactive material-containing waste leaks to the outside of the storage container. For this reason, the storage container is required to have high impact resistance to alleviate external force.
On the other hand, radioactive containers containing radioactive substances or solid substances containing contaminated water may be stored in the container as radioactive substance-containing waste, and moisture containing radioactive substances may leak from the inside over time. There is. Furthermore, the storage container may be stored outdoors for a long period of time, and water may permeate from the outside of the storage container, and the radioactive substance may leak out of the storage container through the water. Therefore, the container is required to have high hermeticity so that radioactive material-containing waste does not leak outside.

  It is an object of the present invention to provide a radioactive substance-containing waste container that has excellent impact resistance that can mitigate impact when dropped, and has high airtightness.

  The radioactive substance-containing waste container according to the present invention is filled between the inner container in which the radioactive substance-containing waste is accommodated, the outer container in which the inner container is disposed, and the inner container and the outer container. And a filler is selected from at least one of a corrugated metal plate, a foam paste, a resin foam, and an elastic body, and the strength of the filler is smaller than that of the inner container and the outer container. And

  The radioactive substance-containing waste container according to the present invention is characterized in that the outer container is stronger than the inner container.

  The radioactive substance-containing waste container according to the present invention is characterized in that the outer container is made of metal and the inner container is polymer-impregnated concrete or steel fiber reinforced polymer-impregnated concrete.

  The radioactive substance-containing waste container according to the present invention is characterized in that the inner container contains a reinforcing bar.

  The radioactive substance-containing waste container according to the present invention is characterized in that a space is provided between fillers.

  The radioactive substance-containing waste container according to the present invention is characterized in that a buffer member is attached to the lower surface of the bottom of the outer container.

  In the radioactive substance-containing waste container according to the present invention, the bottom edge of the outer container is wound around and joined to the lower end of the side wall of the outer container, and the buffer member is fixed to the lower surface of the bottom of the outer container. It is characterized by.

  The radioactive substance-containing waste container according to the present invention is characterized in that the buffer member has an annular shape.

  The radioactive substance-containing waste container according to the present invention is characterized in that a reinforcing material is provided between the lid of the outer container and the lid of the inner container.

  In the radioactive substance-containing waste container according to the present invention, the upper end of the side wall portion of the inner container is coupled by the lid portion of the inner container and the coupling member, and a reinforcing material is provided between the coupling member and the lid portion of the outer container. It is characterized by being.

  The radioactive substance-containing waste container according to the present invention is characterized in that a haunch part is formed between the side wall part of the inner container and the bottom part of the inner container.

The radioactive substance-containing waste container of the present invention has a three-layer structure including an outer container, a filler, and an inner container. When the radioactive substance-containing waste container receives a strong impact due to dropping while being transported by a crane, the outer container absorbs the external force, and the filler acts like a cushion. As the filler, at least one can be selected from a corrugated metal plate, a foam paste, a resin foam, and an elastic body.
When a corrugated metal plate is selected as the filler, the degree of deformation of the radioactive substance-containing waste container when a large external force is applied can be adjusted by changing the thickness or material of the corrugated metal plate. When a bubble paste is selected as the filler, the degree of deformation of the radioactive substance-containing waste container when a large external force is applied can be adjusted by appropriately changing the amount of bubbles to be contained. When a resin foam is selected as the filler, the degree of deformation of the radioactive substance-containing waste container when a large external force is applied can be adjusted by changing the expansion ratio (size) of the resin foam. When an elastic body is selected as the filler, the degree of deformation of the radioactive substance-containing waste container when a large external force is applied can be adjusted by changing the hardness and elastic force of the elastic body.

  Regardless of which filler is selected, a large external force is not applied to the inner container in which the radioactive substance-containing waste is accommodated, and the inner container can be prevented from being damaged or destroyed. Accordingly, the radioactive substance-containing waste container can prevent the radioactive substance-containing waste from leaking out of the inner container even when subjected to a strong impact.

  In the radioactive substance-containing waste container of the present invention, by making the strength of the outer container larger than that of the inner container, the outer container first absorbs external force, so the strength of the inner container does not have to be significantly increased. I'm sorry.

  In the radioactive substance-containing waste container of the present invention, the inner container is composed of polymer-impregnated concrete or steel fiber reinforced polymer-impregnated concrete, and therefore, impact resistance, denseness, and chemical stability compared to ordinary concrete. Is excellent. If the inner container is excellent in impact resistance, the outer container and the filler cannot absorb the external force, and even when an external force is applied to the inner container, the inner container can be prevented from being damaged or broken. Further, since the inner container is excellent in denseness, it is possible to prevent the contained radioactive substance-containing waste from permeating the inner container and leaking out of the inner container. Further, since the inner container has chemical stability, the inner container and the radioactive substance-containing waste do not cause a chemical reaction, and the inner container can be prevented from being deteriorated by the radioactive substance-containing waste.

  Moreover, in the radioactive substance containing waste storage container of this invention, intensity | strength is securable even if the thickness is thin by making an outer side container metal. If the thickness can be reduced and the desired strength can be secured, the size of the outer container relative to the inner container's storage volume can be reduced, and more radioactive material-containing waste can be contained in a smaller-sized radioactive material-containing waste container. Can hold things.

  In the radioactive substance-containing waste container of the present invention, an inner container containing a reinforcing bar can be used. By including a reinforcing bar in the inner container, the strength of the inner container can be increased, and even if a large external force is applied to the inner container, the inner container can be prevented from being damaged or destroyed.

  In the radioactive substance-containing waste container of the present invention, a space is provided between the fillers. When a space is provided, if a large external force is applied to the radioactive material-containing waste container, the filler can be deformed toward the space, so a large force is not applied to the inner container and the inner container is damaged or destroyed. Can be prevented.

  In the radioactive substance-containing waste container of the present invention, since the buffer member is attached to the lower surface of the bottom of the outer container, when the buffer member falls on the ground, the buffer member receives an impact from the ground and absorbs external force. Since the buffer member absorbs the external force, the outer container can be prevented from being deformed by an impact, and the impact resistance of the outer container can be improved.

  In the radioactive substance-containing waste container of the present invention, the bottom edge of the outer container is wound around and joined to the lower end of the side wall of the outer container, and the buffer member is fixed to the lower surface of the bottom of the outer container. Even when the buffer member receives an external force, the entire bottom of the outer container can be prevented from being pushed into the outer container.

  In the radioactive substance-containing waste container of the present invention, since the buffer member has an annular shape, the cost can be reduced as compared with the case where the buffer member is provided on the entire bottom surface of the bottom of the outer container. Furthermore, since the external force received from the ground is used to bend the annular buffer member, the external force applied to the bottom of the outer container is reduced. Therefore, it is possible to prevent the outer container from being deformed when an external force is applied due to a drop impact.

  Since the radioactive substance-containing waste container of the present invention is provided with a reinforcing material between the lid part of the outer container and the lid part of the inner container, the reinforcing material is the lid part of the outer container and the lid of the inner container. Fill part of the space between the parts. Then, since the upward movement of the lid portion of the inner container is restricted, when the radioactive substance-containing waste container receives an external force from below, the lid portion of the inner container collides with the lid portion of the outer container. Can be prevented. Therefore, it is possible to prevent the lid portion of the inner container from being damaged or destroyed, and it is possible to prevent the radioactive substance-containing waste from leaking out of the inner container.

  In the radioactive substance-containing waste container according to the present invention, since the reinforcing member is provided between the coupling member and the lid portion of the outer container, the coupling member is more firmly fixed. Therefore, the lid part of the inner container and the side wall part of the inner container are more firmly fixed, and the lid part of the inner container can be prevented from shifting or coming off.

  In the radioactive substance-containing waste container according to the present invention, since the haunch part is formed between the side wall part and the bottom part of the inner container, the filler layer in the vicinity of the haunch part can be formed thick. Then, when the radioactive substance-containing waste container receives an external force, the filler absorbs a larger force than when the haunch portion is not formed. Therefore, the external force applied to the inner container can be reduced, and damage and destruction of the inner container can be prevented.

It is a figure which shows the radioactive substance containing waste storage container which concerns on embodiment of this invention. (A) Cross section, (b) Bottom view It is a figure which shows the outer side container of the radioactive substance containing waste storage container which concerns on embodiment of this invention. (A) Cross section of outer container, (b) Plan view of outer lid, (c) Plan view of outer side wall It is a figure which shows the inner side container of the radioactive substance containing waste storage container which concerns on embodiment of this invention. (A) Cross section of inner container, (b) Plan view of inner lid, (c) Plan view of small lid, (d) Plan view of inner side wall It is a figure which shows the state in which the reinforcing bar is contained in the inner side container of the radioactive substance containing waste storage container which concerns on embodiment of this invention. It is a figure which shows the state by which the filler was provided in the radioactive substance containing waste storage container which concerns on embodiment of this invention. (A) sectional view, (b) top view It is a figure of the state which used the corrugated steel plate for the filler of the radioactive substance containing waste storage container which concerns on embodiment of this invention. (A) Cross section, (b) AA cross section of (a) It is sectional drawing which used the bubble paste for the filler of the radioactive substance containing waste storage container which concerns on embodiment of this invention. (A) Cross section, (b) AA cross section of (a) It is sectional drawing which used the resin foam for the filler of the radioactive substance containing waste container which concerns on embodiment of this invention. (A) Cross section, (b) AA cross section of (a) It is sectional drawing which used the elastic body for the filler of the radioactive substance containing waste container which concerns on embodiment of this invention. (A) Cross section, (b) AA cross section of (a) It is a figure which shows the state in which the space was formed between the fillers of the bottom part of the radioactive substance containing waste storage container which concerns on embodiment of this invention. It is a figure which shows the state in which the space was formed between the fillers of the side wall part of the radioactive substance containing waste storage container which concerns on embodiment of this invention. It is the figure which showed the procedure for manufacturing the radioactive substance containing waste storage container which concerns on embodiment of this invention. It is the figure which showed the procedure which accommodates the radioactive substance containing waste in the radioactive substance containing waste storage container which concerns on embodiment of this invention. It is the figure which showed the procedure which accommodates the radioactive substance containing waste in the radioactive substance containing waste storage container which concerns on embodiment of this invention. It is the elements on larger scale of FIG.14 (b) of the radioactive substance containing waste storage container which concerns on embodiment of this invention.

A radioactive substance-containing waste container 1 (hereinafter referred to as a container 1) according to this embodiment will be described with reference to FIGS.
The container 1 is a container for storing radioactive material-containing waste, and has a three-layer structure as shown in FIG. The storage container 1 includes an inner container 30 in which radioactive substance-containing waste is stored, an outer container 10 in which the inner container 30 is disposed, and a filler that is filled between the inner container 30 and the outer container 10. 50. The strength of the filler 50 is designed to be smaller than that of the inner container 30 and the outer container 10.

[Outer container 10]
As shown in FIG. 2A, the outer container 10 has an outer lid portion 11, an outer side wall portion 12, and an outer bottom portion 13.
The outer container 10 is a metal cylindrical container. For the outer container 10, for example, a stainless steel plate can be used.
As shown in FIG. 2B, the outer lid portion 11 has a circular shape, and a lid-side flange portion 16 is formed at the lower end of the outer lid portion 11. A plurality of through-holes 15 penetrating vertically are formed in the lid-side flange portion 16 at equal intervals (12 in this embodiment).
As shown in FIG. 2C, a side wall flange 18 is formed at the upper end of the outer side wall 12. The side wall flange portion 18 is overlapped with the lid side flange portion 16 of the outer lid portion 11. A plurality of through holes 19 penetrating vertically are formed in the side wall side flange portion 18. The through holes 19 are respectively formed at positions corresponding to the through holes 15 of the outer lid portion 11. In addition, two sets of suspending portions 17 and 17 facing each other are formed on the outer periphery on the upper side of the outer side wall portion 12. The container 1 is transported by a crane with a wire connected to the hanging portion 17.
The outer bottom portion 13 is a disc having a diameter larger than the diameter of the outer side wall portion 12, and an outer edge thereof is wound around the lower end of the outer side wall portion 12 to be coupled to the outer side wall portion 12.
An annular buffer member 20 is attached to and secured to the lower surface of the outer bottom portion 13 separately from the outer container 10 (FIG. 2A). The buffer member 20 has an annular shape, and is attached along the circumference of the lower surface of the outer bottom portion 13. The buffer member 20 is made of metal, and for example, a stainless steel plate can be used for the buffer member 20. The buffer member 20 is fixed to the outer bottom portion 13 by welding. The length in the height direction of the buffer member 20 is designed to be 2 cm to 20 cm.
The strength of the outer container 10 is greater than that of the inner container 30, and the yield strength of the outer container 10 is preferably 205 MPa or more and 400 MPa or less.

[Inner container 30]
The inner container 30 is disposed inside the outer container 10 and accommodates radioactive substance-containing waste. As shown in FIG. 3A, the inner container 30 has an inner lid portion 31, an inner sidewall portion 32, and an inner bottom portion 33, and the inner bottom portion 33 is interposed between the inner sidewall portion 32 and the inner bottom portion 33. A haunch portion 35 is formed so that the inner and outer diameters of the inner container 30 become smaller. The haunch portion 35 is inclined on both the inner and outer sides of the inner container 30.
Moreover, the outer diameter of the inner container 30 is smaller than the inner diameter of the outer container 10, and the height of the inner container 30 is designed to be lower than the height of the outer container 10.
The inner container 30 is a cylindrical container, and the inner container 30 includes a polymer impregnated concrete (hereinafter referred to as PIC) or a steel fiber reinforced polymer impregnated concrete (hereinafter referred to as a PIC). , Written as SFPIC).
The thickness of the inner container 30 is designed to be 100 mm or less.

The inner lid portion 31 has a circular shape, and the inner container 30 is hermetically sealed by being fitted to the inner side wall portion 32. As shown in FIG. 3B, a plurality of through-holes 36 penetrating vertically are formed on the circumference of the upper surface of the inner lid portion 31 (12 in this embodiment). In addition, a window portion 37 penetrating the lid portion 31 up and down is formed at the center of the inner lid portion 31. A plurality of holes 42 are formed around the window portion 37. A small lid 38 is attached to the window portion 37 as shown in FIG.
The small lid 38 is formed with a plurality of through holes 43 penetrating vertically, and is attached to the window portion 37 with bolts or the like through the through holes 43.
As shown in FIG. 3D, a plurality of holes 34 are formed in the upper end surface of the inner side wall portion 32. The hole 34 is formed at a position corresponding to the through hole 36.
In addition, as shown in FIG. 4, the inner container 30 may be one containing a reinforcing bar 39. The reinforcing bars 39 are provided in a spiral shape inside the inner side wall portion 32, and are provided in a mesh shape inside the inner bottom portion 33.
The compressive strength of the inner container 30 is preferably 120 MPa or more and 250 MPa or less.

[Filler 50]
As shown in FIG. 5A, the filler 50 is filled in a gap formed between the outer container 10 and the inner container 30. As the filler 50, a filler 50 having a lower strength than the outer container 10 and the inner container 30 is used.
FIG. 5 shows the container 1 in which mortar is used for the filler 50. The mortar filler 50 is filled in the gap between the outer container 10 and the inner container 30 and then cured to form a layer. As shown in FIG. 5B, the filler 50 is provided in a gap between the outer container 10 and the inner container 30 and is arranged in an annular shape between the outer container 10 and the inner container 30. The compressive strength of the filler 50 only needs to be strong enough to withstand the weight of the inner container 30 and the waste and its vibration, and is preferably 5 MPa or more.
The width of the gap between the outer container 10 and the inner container 30 (the thickness of the filler 50) is preferably 2 cm to 15 cm. The width of the gap is appropriately changed depending on the type of filler 50 used.

  The container 1 according to the present embodiment has a great feature in that the material of the filler 50 can be selected as appropriate. As the filler 50, any one of a corrugated metal plate 51, a bubble paste 52, a resin foam 53, and an elastic body 54 can be used. Hereinafter, each type of filler 50 will be described.

[Corrugated metal plate 51]
For example, a steel plate can be used for the corrugated metal plate 51.
As shown in FIG. 6A, the corrugated metal plate 51 is inserted into the gap and is provided in an annular shape so as to fill the gap between the outer container 10 and the inner container 30. The corrugated metal plate 51 is a steel plate having a cross-sectional corrugation in which crest portions 51a and corrugated valley portions 51b are alternately arranged. The corrugated metal plate 51 has corrugated top and trough portions 51b. Is an elliptical cross section. The corrugated metal plate 51 is integrally formed, and the distance between the top of the crest 51a and the top of the trough 51b is substantially equal to the width of the gap. The top part of the peak part 51 a is in contact with the inner wall of the outer container 10, and the valley part 51 b is in contact with the outer wall of the inner container 30.
Further, the corrugated metal plate 51 is also provided between the outer bottom portion 13 and the inner bottom portion 33 as shown in FIG.

[Bubble paste 52]
As the foam paste 52, for example, an inorganic hydraulic material can be used. As the foaming agent for the foam paste 52, surfactants, proteins, and water-soluble polymers can be used. As shown in FIG. 7A, the bubble paste 52 is filled between the outer side wall portion 12 and the inner side wall portion 32 and between the outer bottom portion 13 and the inner bottom portion 33. As shown in FIG. 7B, the bubble paste 52 is filled in a gap between the outer container 10 and the inner container 30 in an annular shape.
When the foam paste 52 is used, if the width of the gap is 5 cm or more, the foam paste 52 may be cracked. Therefore, the width of the gap is preferably 2 cm to less than 5 cm.

[Resin foam 53]
For the resin foam 53, for example, a vinyl chloride foam or a polyethylene terephthalate foam can be used. As the resin foam 53, an arbitrary shape can be used.
As shown in FIG. 8A, the resin foam 53 is provided between the outer side wall portion 12 and the inner side wall portion 32 and between the outer bottom portion 13 and the inner bottom portion 33. As shown in FIG. 8B, the resin foam 53 is provided in an annular shape in the gap between the outer container 10 and the inner container 30.
As the resin foam 53, one formed integrally or one formed separately can be used.

[Elastic body 54]
As the elastic body 54, for example, a rubber elastic body can be used.
As shown in FIG. 9A, the elastic body 54 is provided between the outer side wall portion 12 and the inner side wall portion 32 and between the outer bottom portion 13 and the inner bottom portion 33. As shown in FIG. 9B, the elastic body 54 is provided in an annular shape in the gap between the outer container 10 and the inner container 30.

These fillers 50 can also be provided in a part of the gap between the outer container 10 and the inner container 30. An example of this will be described in the case where a bubble paste 52 is used as the filler 50.
As shown in FIG. 10, the bubble paste 52 is provided in a part between the outer bottom portion 13 and the inner bottom portion 33, and the bubble paste 52 is not provided in other portions. For this reason, a space is formed between the bubble pastes between the outer bottom portion 13 and the inner bottom portion 33. On the other hand, as shown in FIG. 11, the bubble paste 52 can also be provided between the outer side wall portion 12 and the inner side wall portion 32 with an interval in the circumferential direction. In the container 1 of FIG. 11, the bubble paste 52 is provided at four locations on the outer periphery of the inner container 30, and spaces are formed in other portions.

Next, the manufacturing method of the storage container 1 and the procedure for storing the radioactive substance-containing waste in the storage container 1 will be described with reference to FIGS. In addition, the case where the foam paste 52 is used for the filler 50 is demonstrated as an example.
First, as shown in FIG. 12A, a raising member (not shown) is arranged on the outer bottom portion 13, and the inner container 30 is arranged inside the outer container 10. Since the outer diameter of the inner container 30 is smaller than the inner diameter of the outer container 10, a gap is formed between the outer side wall part 12 and the inner side wall part 32. The inner container 30 is arranged inside the outer container 10 so that the widths of the gaps are substantially equal. Further, a gap is also formed between the outer bottom portion 13 and the inner bottom portion 33 by the raising member. Therefore, a gap is formed around the entire inner container 30.

Next, as shown in FIG. 12B, the filler 50 is poured from the gap and filled in the entire gap. The filler 50 is filled to the same height as the upper end surface of the inner side wall portion 32 of the inner container 30. The filler 50 hardens after a certain period of time and forms a layer of the filler 50.
Since the widths of the gaps between the outer sidewall portion 12 and the inner sidewall portion 32 are substantially equal, the layer of filler 50 between the outer sidewall portion 12 and the inner sidewall portion 32 has substantially the same thickness. On the other hand, since the haunch portion 35 is formed between the inner side wall portion 32 and the inner bottom portion 33 of the inner container 30, the outer side wall is located between the haunch portion 35 and the outer side wall portion 12 and the outer bottom portion 13. More filler 50 is filled than the gap between the portion 12 and the inner side wall portion 32 (or the outer bottom portion 13 and the inner bottom portion 33). Therefore, the layer of the filler 50 formed in the vicinity of the haunch portion 35 is thicker than the layer of the filler 50 in the gap between the inner side wall portion 32 and the inner bottom portion 33.

Next, as shown in FIG. 12 (c), a damming sponge and an epoxy resin adhesive 45 are provided on the entire upper end portion of the inner side wall portion 32, and the inner lid portion 31 is set from above, and the inner lid portion 31 is placed on the inner side. Adhere to the side wall 32 and fix. Further, the inner lid portion 31 is fixed to the inner side wall portion 32 by a bolt 44. At this time, the inner lid portion 31 is fixed in a state where the small lid 38 is not provided.
Then, as shown in FIG. 13A, an annular damming ring 40 is provided on the upper surface of the inner lid portion 31, and the reinforcing material 41 is poured into a region formed by the damming ring 40 and the outer container 10. At this time, the reinforcing member 41 covers the bolt 44 that fixes the inner lid portion 31 and the inner side wall portion 32, and is provided so as to have the same height as the upper end surface of the outer side wall portion 12, and is cured. The reinforcing material 41 can be mortar.

Next, as shown in FIG. 13B, the radioactive substance-containing waste is packed into the inner container 30 through the window portion 37 and stored. After containing the radioactive material-containing waste, as shown in FIG. 13 (c), the small lid 38 is set in the window 37 so that the hole 42 and the through hole 43 overlap, and is fixed with a bolt, and the inner container 30 is fixed. Seal.
Then, as shown in FIG. 14 (a), the outer lid portion 11 is set on the upper end of the outer side wall portion 12 so that the through hole 15 and the through hole 19 overlap with each other, and bolts are passed through the through holes 15 and 19. Fix it. Since the reinforcing member 41 is provided at the same height as the upper end surface of the outer side wall portion 12, as shown in FIG. 14 (b), the reinforcing member 41 contacts the lower surface of the outer lid portion 11, and the outer lid portion 11 and the inner lid portion. 31. As shown in FIG. 15, the reinforcing member 41 is disposed on the filler 50, the inner lid portion 31, and the bolt 44, and is disposed so as to fill the space between the inner lid portion 31 and the outer lid portion 11. The reinforcing material 41 is provided in an annular shape.
As shown in FIG. 14 (c), the container 1 in which the radioactive substance-containing waste is accommodated has a wire attached to the hanging portion 17 and is transported by a crane.

  Next, the operation / effect of the container 1 will be described.

The storage container 1 according to the present embodiment is greatly characterized by having a three-layer structure including the outer container 10, the filler 50, and the inner container 30.
The container 1 receives a strong impact when it falls on the ground while being transported by a crane. When a large external force is applied to the container 1, the external force is first applied to the outer container 10. The outer container 10 absorbs this external force, but if this external force cannot be fully countered, the external force is then applied to the filler 50. Since the filler 50 is deformed to be smaller than the strength of the outer container 10 and the inner container 30, it functions like a cushion. Therefore, the filler 50 absorbs external force, and no large external force is applied to the inner container 30 in which the radioactive substance-containing waste is accommodated. Thus, when the outer container 10 and the filler 50 absorb external force, a large external force is not applied to the inner container 30, and the inner container 30 can be prevented from being damaged or destroyed.
Therefore, the storage container 1 has a three-layer structure, and by placing the filler 50 in the middle, the radioactive substance-containing waste can leak out of the inner container 30 even when subjected to a strong impact due to dropping or the like. Can be prevented.
Hereinafter, effects when the corrugated metal plate 51, the foam paste 52, the resin foam 53, and the elastic body 54 are used for the filler 50 will be described.

  When the corrugated metal plate 51 is used as the filler 50, the degree of deformation of the container 1 when a large external force is applied can be adjusted by changing the thickness, material, strength, and void amount. Further, when the corrugated metal plate 51 is provided, a gap is formed between the peak portion 51a and the inner side wall portion 32 and between the valley portion 51b and the outer side wall portion 12, respectively. Then, when a large external force is applied to the outer container 10, the corrugated metal plate 51 receives a large external force and deforms toward the gap. Therefore, it is possible to prevent the inner container 30 from being damaged or destroyed without applying a large external force to the inner container 30.

  When the bubble paste 52 is used as the filler 50, the degree of deformation of the container 1 when a large external force is applied can be adjusted by appropriately changing the amount and strength of bubbles to be contained. In addition, since the bubble paste 52 has fluidity, it is easier to fill the gap between the outer container 10 and the inner container 30 as compared with the case where another filler 50 is provided.

  When the resin foam 53 is used as the filler 50, the degree of deformation of the container 1 when a large external force is applied by changing the expansion ratio (size), void amount, and strength of the resin foam 53. Can be adjusted. Further, since the resin foam 53 is smaller in weight than the other fillers 50, the weight of the entire container 1 is reduced. Therefore, the container 1 can be transported at a lower cost.

  When a rubber-like elastic body 54 is used as the filler 50, the degree of deformation of the container 1 when a large external force is applied can be adjusted by changing the hardness and elastic force of the elastic body 54. When a large external force is applied from the outer container 10, the rubber-like elastic body 54 absorbs the force. Therefore, it is possible to prevent the inner container 30 from being damaged or destroyed without applying a large external force to the inner container 30.

  The storage container 1 according to the present embodiment can also provide a space between the outer bottom portion 13 and the inner bottom portion 33 or between the outer side wall portion 12 and the inner side wall portion 32. When each space is provided, when a large external force is applied to the container 1, the filler 50 can be deformed toward the space. Further, since the filler 50 cannot be provided in the gap, the cost can be reduced accordingly.

The inner container 30 of the storage container 1 according to the present embodiment is composed of PIC or SFPIC. PIC and SFPIC are superior in impact resistance compared to ordinary concrete. Therefore, even when the outer container 10 and the filler 50 cannot absorb the force and the force is applied to the inner container 30, it is possible to prevent the inner container 30 from being damaged or destroyed.
Moreover, PIC and SFPIC are excellent in denseness compared with normal concrete. Therefore, even if radioactive substance-containing waste is stored in the inner container 30, it is possible to prevent the radioactive substance-containing waste from permeating the inner container 30 and leaking out of the inner container 30. Further, even when water enters from the outside of the outer container 10, the water does not penetrate from the outside of the inner container 30 to the inside.
Moreover, PIC and SFPIC are excellent in chemical stability compared with normal concrete. Therefore, the inner container 30 does not cause a chemical reaction with the contained radioactive substance-containing waste, and the inner container 30 can be prevented from being deteriorated by the radioactive substance-containing waste.
From the above, by configuring the inner container 30 with PIC or SFPIC, it is possible to reliably prevent the radioactive material-containing waste from leaking out of the inner container 30.

  Moreover, the outer container 10 of the storage container 1 according to the present embodiment can be made of metal. By making the outer container 10 made of metal, the strength can be ensured even if the thickness is small. If the thickness can be reduced and a desired strength can be ensured, the size of the storage container 1 relative to the storage volume of the inner container 10 can be reduced. If the size of the storage container 1 with respect to the storage volume of the inner container 10 can be reduced, more radioactive material-containing waste can be stored in the storage container 1 having a smaller size.

The inner container 30 including the reinforcing bars 39 can be used for the container 1 according to the present embodiment. Since the inner container 30 includes the reinforcing bar 39, the strength of the inner container 30 can be increased. When the container 1 receives a strong impact or when the outer container 10 and the filler 50 cannot absorb the external force, a strong external force is applied to the inner container 30.
Even when a strong force is applied to the inner container, since the inner container 30 includes the reinforcing bar 39, the strength of the inner container 30 can be secured, and the inner container 30 can be prevented from being damaged or broken. Therefore, it is possible to more reliably prevent the radioactive substance-containing waste from leaking out of the inner container 30.

In the storage container 1 according to the present embodiment, the outer container 10 has a yield strength of 205 MPa to 400 MPa, the inner container 30 has a compressive strength of 120 MPa to 250 MPa, and may have a strength capable of withstanding the weight of the inner container and waste and its vibration. 5 MPa or more. Since each member has such strength, the outer container 10 and the filler 50 absorb external force even when the container 1 receives a strong impact, so that the inner container 30 is prevented from being damaged or destroyed. it can.
Furthermore, even when the storage container 1 is stacked vertically, it can withstand the load applied to the storage container 1.

  A buffer member 20 is provided on the outer bottom 13 of the outer container 10 of the container 1 according to the present embodiment. Since the buffer member 20 is a separate member from the outer container 10, the outer container 10 is not subjected to stress from the buffer member 20 when the buffer member 20 receives an external force. Therefore, the outer container 10 can be prevented from being deformed by an external force.

  A haunch portion 35 is formed between the inner side wall portion 32 and the inner bottom portion 33 of the inner container 30 of the storage container 1 according to the present embodiment. Therefore, the layer of the filler 50 in the vicinity of the haunch portion 35 can be formed thicker than when the haunch portion 35 is not provided. Then, when the container 1 receives an external force from the edge portion where the outer side wall portion 12 and the outer bottom portion 13 are joined, the filler 50 exerts a greater force than when the haunch portion 35 is not formed. Can be absorbed. Therefore, the external force applied to the inner container 30 can be reduced.

A reinforcing member 41 is provided between the outer lid portion 11 and the inner lid portion 31 of the storage container 1 according to the present embodiment. Therefore, the upward movement of the inner container 30 is restricted. Then, when the receiving container 1 receives an external force from below, the movement of the inner container 30 is restricted upward, so that the inner lid 31 can be prevented from colliding with the outer lid 11. Therefore, it is possible to prevent the inner container 30 from being damaged or destroyed.
Further, the reinforcing member 41 is poured onto a bolt that fixes the inner lid portion 31 and the inner side wall portion 32 and is cured. Therefore, the inner side cover part 31 and the inner side wall part 32 are fixed more firmly.

  In addition, in the storage container 1 according to the present embodiment, the buffer member 20 is provided on the lower surface of the outer bottom portion 13 of the outer container 10 as a separate member from the outer container 10. The container 1 receives a strong impact when it falls on the ground while being transported by a crane. For example, when the storage container 1 falls vertically on the ground, the buffer member 20 first receives an impact from the ground, absorbs external force, and deforms. Since the buffer member 20 is formed of a member different from the outer container 10, the outer container 10 is not subjected to stress even if the buffer member 20 is deformed by receiving an external force. Therefore, the outer container 10 can be prevented from being deformed by an impact. Further, if the buffer member 20 absorbs external force, the inner container 30 does not receive a large external force, so that the inner container 30 can be prevented from being damaged or destroyed, and radioactive substance-containing waste can be leaked to the outside of the inner container 30. Can be prevented.

Since the container 1 according to this embodiment has the edge of the outer bottom portion 13 wound around and joined to the lower end of the outer side wall portion 12, the outer diameter of the outer bottom portion 13 is larger than the outer diameter of the outer side wall portion 12. Is formed. Therefore, even when the buffer member 20 receives an external force due to falling, the entire outer bottom portion 13 can be prevented from being pushed into the outer container 10.
Moreover, in the storage container 1 which concerns on this embodiment, since the buffer member 20 uses a circular thing, compared with the case where the buffer member 20 is provided in the whole lower surface of the outer side bottom part 13, cost can be reduced. . Furthermore, since the external force received from the ground by falling is used to bend the annular buffer member 20, the external force applied to the outer bottom portion 13 is reduced. Therefore, it is possible to prevent the outer container 10 from being deformed when an external force is applied to the storage container 1 due to a drop impact.

A reinforcing member 41 is provided between the outer lid portion 11 and the inner lid portion 31 of the storage container 1 according to the present embodiment. The reinforcing material 41 fills a part of the space between the outer lid portion 11 and the inner lid portion 31. Therefore, the upward movement of the inner lid portion 31 (inner container 30) is restricted. Then, when the receiving container 1 receives an external force from below, the movement of the inner lid 31 (inner container 30) is restricted upward, so that the inner lid 31 does not collide with the outer lid 11. it can.
Thus, since it can prevent that the inner side cover part 31 collides with the outer side cover part 11, it can prevent that the inner side cover part 31 (inner side container 30) is damaged and destroyed, and a radioactive substance containing waste material is an inner side container. It is possible to prevent leakage to the outside of 30.
In addition, the reinforcing member 41 is poured onto the bolt 44 that fixes the inner lid portion 31 and the inner side wall portion 32 and is cured. Since the reinforcing member 41 is cured on the bolt 44, the bolt 44 is more firmly fixed. Therefore, the inner lid portion 31 and the inner side wall portion 32 are more firmly fixed, and the inner lid portion 31 can be prevented from shifting or coming off, and the radioactive substance-containing waste can be leaked out of the inner container 30. Can be prevented.

A haunch portion 35 is formed between the inner side wall portion 32 and the inner bottom portion 33 of the inner container 30 of the storage container 1 according to the present embodiment. The haunch portion 35 is formed so that the outer diameter of the inner container 30 becomes smaller toward the inner bottom portion 33, and therefore the layer of the filler 50 near the haunch portion 35 compared to the case where the haunch portion 35 is not provided. Can be formed thick.
Then, when the container 1 receives an external force from an edge portion where the outer side wall portion 12 and the outer bottom portion 13 are joined, for example, the filler 50 is larger than the case where the haunch portion 35 is not formed. Absorb power.
Therefore, by forming the haunch part 35, the layer of the filler 50 can be formed thick and the external force can be absorbed, so that the external force applied to the inner container 30 can be reduced and the inner container 30 can be prevented from being damaged or broken. be able to.

Although the present embodiment has been described above, the configuration described in the above embodiment can be selected or changed to other configurations as appropriate without departing from the gist of the present invention. . In the present embodiment, the cylindrical storage container 1 has been described. However, the shape of the storage container 1 is not limited to a cylindrical shape, and may be a rectangular cylindrical storage container.
Further, in the present embodiment, an example in which any one of the corrugated metal plate 51, the bubble paste 52, the resin foam 53, and the elastic body 54 is used as the filler 50 is shown. Can also be used in combination. For example, after the corrugated metal plate 51 is provided, the gap between the peak portion 51a and the inner side wall portion 32 or the gap between the valley portion 51b and the outer side wall portion 12 can be filled with the bubble paste 52. .

The corrugated metal plate 51 is not limited to the above-mentioned one, and a corrugated bent shape such as a rectangular cross section or a triangular cross section (including various honeycomb structures) can be used. A porous metal (porous metal) can also be used. Note that the corrugated metal plate 51 may be a divided metal plate other than those integrally formed.
The resin foam 53 is not limited to the above, and a resin having a honeycomb structure or a resin in which bubbles are mixed before curing can also be used.
The elastic body 54 is not limited to the above, and a gel substance can also be used.
In the present embodiment, the annular buffer member 20 has been described, but the buffer member 20 is a separate member from the outer container 10 and is not limited to an annular shape as long as it is a member that absorbs impact.

1 Radioactive substance-containing waste container (container)
DESCRIPTION OF SYMBOLS 10 Outer container 11 Outer cover part 12 Outer side wall part 13 Outer bottom part 15 Through hole 16 Lid side flange part 17 Hanging part 18 Side wall side flange part 19 Through hole 20 Buffer member 30 Inner container 31 Inner cover part 32 Inner side wall part 33 Inner bottom part 34 Hole 35 Haunch part 36 Through hole 37 Window part 38 Small window 39 Reinforcing bar 40 Damping ring 41 Reinforcement material 42 Hole 43 Through hole 44 Bolt 45 Epoxy resin adhesive 50 Filler 51 Corrugated metal plate 51a Mountain part 51b Valley part 52 Bubble Paste 53 Resin foam 54 Elastic body

Claims (11)

An inner container for containing radioactive material-containing waste;
The inner container is an outer container disposed therein;
A filler filled between the inner container and the outer container,
The filler is selected from at least one of a corrugated metal plate, a foam paste, a resin foam, and an elastic body,
The filler has a lower strength than the inner and outer containers;
A radioactive material-containing waste container. The strength of the outer container is greater than that of the inner container,
The radioactive substance-containing waste container according to claim 1. The outer container is made of metal;
The inner container is polymer impregnated concrete or steel fiber reinforced polymer impregnated concrete,
The radioactive substance-containing waste container according to claim 1 or 2. The inner container contains a reinforcing bar,
The radioactive substance-containing waste container according to any one of claims 1 to 3, wherein the container is a radioactive substance-containing waste container. A space is provided between the fillers,
The radioactive substance-containing waste container according to any one of claims 1 to 4, wherein the container is a radioactive substance-containing waste container. A buffer member is attached to the bottom surface of the bottom of the outer container.
The radioactive substance-containing waste container according to any one of claims 1 to 5, wherein the container is a radioactive substance-containing waste container. The edge of the bottom of the outer container is wound around and joined to the lower end of the side wall of the outer container,
The buffer member is fixed to the lower surface of the bottom of the outer container;
The radioactive substance-containing waste container according to claim 6. The buffer member is annular;
The radioactive substance-containing waste container according to claim 6 or 7. A reinforcing material is provided between the lid portion of the outer container and the lid portion of the inner container,
The radioactive substance-containing waste container according to any one of claims 1 to 8, wherein the container is a radioactive substance-containing waste container. The upper end of the side wall portion of the inner container is coupled to the lid portion of the inner container by a coupling member,
The reinforcing material is provided between the coupling member and the lid of the outer container.
The radioactive substance-containing waste container according to any one of claims 1 to 9, wherein the container is a radioactive substance-containing waste container. A haunch portion is formed between the side wall portion of the inner container and the bottom portion of the inner container,
The radioactive substance-containing waste container according to any one of claims 1 to 10, wherein the container is a radioactive substance-containing waste container.

Images