JP6830383B2 - Waste manufacturing method and waste disposal method - Google Patents

Description

The present invention relates to a waste that can safely and efficiently dispose of radioactive waste, a method for producing the same, and a method for disposing of the waste.

In geological disposal in which the vitrified material is placed in the disposal mine, the area around the waste that contains the vitrified material in the overpack is protected with a buffer material, and the inside of the disposal mine is filled with bentonite-based filler. By filling, the earth pressure acting on the waste is buffered, the contact of groundwater with the waste is suppressed, and the leakage of radionuclides from the waste is suppressed.

As a method for imposing a cushioning material in such geological disposal, a block method, a spray method, a PEM method, and the like have been proposed (see, for example, Non-Patent Document 1). Hereinafter, each disposal method will be described by taking as an example the case where the waste is placed horizontally in the disposal tunnel.

As shown in FIG. 8A, the block method is a method in which a cushioning material block 41 is stacked around the waste body 40, and the gap between the waste body 40, the cushioning material block 41, and the disposal tunnel 42 is filled with a filler. Is.

In the spraying method, as shown in FIG. 8B, after the waste 50 is placed on the bottom cushioning material block 51, a mixture 52 of bentonite and silica sand is sprayed around the waste 50 to form the waste 50. It fills the gap with the disposal tunnel 53.

In the PEM method, as shown in FIG. 8C, a waste body 60 covered with a cushioning material block 61 whose surroundings are solidified in a predetermined shape in advance at a ground facility is housed in a steel cell 62 and discarded. The body 60 is placed in the disposal tunnel 63 in a state of being housed in the steel cell 62.

Nuclear Waste Management Organization of Japan "Ensuring the Safety of Geological Disposal Business (2010 Edition) -For the Realization of Safe Geological Disposal with Reliable Technology-", September 2011, p. 6-91-6-95

However, for example, in geological disposal using the spraying method, it is difficult to apply the cushioning material to the desired density due to the large amount of rebound of the mixture during spraying, so in the geological disposal using each of the above methods. Since the circumference of the waste is covered with a low-density cushioning material, there is a risk that the groundwater will come into contact with the waste. In addition, since the cushioning material begins to exert its physical and chemical cushioning functions when it swells with groundwater, these cushioning functions cannot be obtained immediately after the waste is placed and before the cushioning material swells. There was a problem.

In addition, in geological disposal using the PEM method, the size of the steel cell tends to be large, so the handling when transporting and stationary the steel cell is poor, and steps and slopes in the disposal tunnel are formed with high accuracy. There was a problem that it was necessary.

Therefore, a technical problem to be solved in order to safely and easily dispose of the waste in the geological formation arises, and an object of the present invention is to solve this problem.

The present invention is proposed in order to achieve the above object, and the invention according to claim 1 is a method for producing a waste product in which a vitrified material is contained in an overpack, wherein the overpack is used. A step of installing in the mold, a step of filling a cushioning material between the overpack and the mold, and a step of accommodating the vitrified body in the overpack and closing the overpack. The step of compressing the cushioning material filled in the mold so as to cover the overpack to form a cushioning material layer integrated with the overpack, and integrating the overpack and the cushioning material. Provided is a step of removing the mold after forming the mold, and a method for producing a waste product including.

According to this configuration, the consolidated cushioning material layer is integrated with the overpack so as to be in contact with the overpack, so that the cushioning material is cushioned immediately after the waste is placed without swelling the cushioning material with groundwater. You can get the function.

Further, since the cushioning material layer is integrated with the overpack, the heat generated from the vitrified body is smoothly transferred to the outside through the cushioning material layer in contact with the overpack, so that the cushioning material layer rises excessively. It is possible to suppress a decrease in the cushioning function of the cushioning material layer due to the above.

In addition, since the cushioning material layer is integrated with the overpack, the formation of a groundwater passage at the boundary between the overpack and the cushioning material layer is suppressed when the groundwater is infiltrated by re-flooding, and piping is performed. It is possible to suppress the outflow of cushioning material due to erosion.

Further, by forming a cushioning material layer around the overpack in advance before accommodating the vitrified material in the overpack, the vitrified material is cushioned around the waste material in a short time after being contained in the overpack. It can be covered with a material layer. Further, by removing the mold, the cushioning material layer is located on the outermost periphery of the waste body, so that the waste body can be stably placed.

The invention according to claim 2 is a method for producing a waste body in which a vitrified body is housed in an overpack, wherein the waste body is placed in a mold and the overpack is covered. After the step of compressing the cushioning material filled in the mold to form the cushioning material layer integrated with the overpack and integrating the overpack and the cushioning material, the mold is formed. Provided is a step of demolding and a method for producing a waste including.

According to this configuration, since the compacted cushioning material layer is integrated with the overpack so as to be in contact with the overpack, the cushioning function of the cushioning material layer can be obtained immediately after the waste is placed, and the vitrified body can be used. The generated heat can be transmitted to the outside through the cushioning material layer to suppress the deterioration of the cushioning function of the cushioning material layer, and further suppress the outflow of the cushioning material layer due to re-flooding. Further, by removing the mold, the cushioning material layer is located on the outermost periphery of the waste body, so that the waste body can be stably placed.

The invention according to claim 3 is a method for manufacturing a waste body in which a vitrified body is housed in an overpack, wherein the overpack is installed in a mold, and the overpack and the mold are used. A step of filling the buffer material between the above, a step of accommodating the vitrified material in the overpack and closing the overpack, and the step of filling the mold so as to cover the overpack. Provided is a method for producing a waste product , which comprises a step of compressing a cushioning material with a static pressure to form a cushioning material layer integrated with the overpack .

According to this configuration, the consolidated cushioning material layer is integrated with the overpack so as to be in contact with the overpack, so that the cushioning material is cushioned immediately after the waste is placed without swelling the cushioning material with groundwater. You can get the function. Further, since the cushioning material layer is integrated with the overpack, the heat generated from the vitrified body is smoothly transferred to the outside through the cushioning material layer in contact with the overpack, so that the cushioning material layer rises excessively. It is possible to suppress a decrease in the cushioning function of the cushioning material layer due to the above. In addition, since the cushioning material layer is integrated with the overpack, the formation of a groundwater passage at the boundary between the overpack and the cushioning material layer is suppressed when the groundwater is infiltrated by re-flooding, and piping is performed. It is possible to suppress the outflow of cushioning material due to erosion. Further, by forming a cushioning material layer around the overpack in advance before accommodating the vitrified body in the overpack, the vitrified body is cushioned around the waste body in a short time after being contained in the overpack. It can be covered with a material layer. Further, as compared with the case where dynamic pressure is applied, a multi-layered cushioning material layer is formed by repeatedly sprinkling the cushioning material into a thin layer and compressing the cushioning material at a constant pressure, resulting in a smaller size. A cushioning material layer can be obtained with a press machine. Further, since the maximum pressure applied to the cushioning material is reduced, the cushioning material layer can be safely formed without physically affecting the overpack.

The invention according to claim 4 is a method for producing a waste body in which a vitrified body is housed in an overpack, wherein the waste body is placed in a mold and the overpack is covered. Provided is a method for producing a cushioning material , which comprises a step of compressing a cushioning material filled in the mold with a static pressure to form a cushioning material layer integrated with the overpack .

According to this configuration, since the compacted cushioning material layer is integrated with the overpack so as to be in contact with the overpack, the cushioning function of the cushioning material layer can be obtained immediately after the waste is placed, and the vitrified body can be used. The generated heat can be transmitted to the outside through the cushioning material layer to suppress the deterioration of the cushioning function of the cushioning material layer, and further suppress the outflow of the cushioning material layer due to re-flooding. Further, as compared with the case where dynamic pressure is applied, a multi-layered cushioning material layer is formed by repeatedly sprinkling the cushioning material into a thin layer and compressing the cushioning material at a constant pressure, resulting in a smaller size. A cushioning material layer can be obtained with a press machine. Further, since the maximum pressure applied to the cushioning material is reduced, the cushioning material layer can be safely formed without physically affecting the overpack.

The invention according to claim 5 provides a method for producing a waste body, which further comprises a step of freezing the cushioning material in addition to the constitution of the invention according to any one of claims 1 to 4 .

According to this configuration, the cushioning material layer is stably held even after the mold is removed, so that a stable cushioning material layer can be obtained.

The invention according to claim 6 is a method for disposing of waste obtained by the manufacturing method according to any one of claims 1 to 5 and placing the waste in a disposal tunnel, wherein the waste is placed. A step of installing a cushioning material block in the disposal tunnel so as to form a stationary position, a step of imposing the waste at the stationary position, a step of covering the waste with a buffer block, and the waste. Provided is a method for disposing of waste, including a step of filling the space between the disposal tunnel and the buffer block with a filler.

According to this configuration, by placing the waste in the stationary position with a gap secured between the waste and the cushioning material block, the positioning accuracy when the waste is placed is relaxed, and the waste can be placed. In the disposal method according to this embodiment, it can be easily placed. Further, since the cushioning material layer is located inside the gap and the cushioning material block is located outside the gap, early gap closure can be expected due to infiltration of groundwater, and the safety of overpacking can be improved.

The invention according to claim 7, in addition to the configuration of the invention according to claim 6, is a method for disposing of waste in which the cushioning material block is interposed between at least the waste body and the inner peripheral wall of the disposal tunnel. I will provide a.

According to this configuration, since the waste is formed to have a smaller diameter than the disposal tunnel by the amount of the cushioning material block, contact between the waste and the inner peripheral wall of the disposal tunnel is prevented when the waste is placed, and the waste is disposed of. Can be carried in smoothly.

In the present invention, since the compacted cushioning material layer is integrated with the overpack so as to be in contact with the overpack, the cushioning function of the cushioning material layer can be obtained immediately after the waste is placed, and the vitrified material is produced. Heat can be transferred to the outside through the cushioning material layer to suppress a decrease in the cushioning function of the cushioning material layer, and further suppress the outflow of the cushioning material layer due to re-submersion.

A perspective view and a vertical sectional view schematically showing a waste body according to an embodiment of the present invention. The flowchart which shows the procedure of manufacturing the waste which concerns on 1st Embodiment of this invention. FIG. 2 is a partial cross-sectional view schematically showing a procedure for manufacturing the waste body of FIG. The flowchart which shows the procedure for manufacturing the waste body which concerns on 2nd Example of this invention. FIG. 6 is a partial cross-sectional view schematically showing a procedure showing a waste body of FIG. A partial cross-sectional view schematically showing a procedure for vertically geologically disposing of a waste according to an embodiment of the present invention. A partial cross-sectional view schematically showing a procedure for geological disposal of a waste body according to an embodiment of the present invention in the horizontal and vertical directions. A cross-sectional view schematically showing the structure of geological disposal of waste.

The present invention is a method for producing a waste body in which a vitrified body is housed in an overpack in order to safely and easily dispose of the waste body in a geological formation, and a step of installing the overpack in a mold. The process of filling the cushioning material between the overpack and the mold, the process of accommodating the vitrified material in the overpack and closing the overpack, and the process of filling the mold so as to cover the overpack. This was achieved by including a step of compressing the buffer material to form a buffer material layer integrated with the overpack.

Further, the present invention is a method for manufacturing a waste body in which a vitrified body is housed in an overpack in order to safely and easily dispose of the waste body in a geological formation, and is a step of installing the waste body in a mold. This was realized by including a step of compressing the cushioning material filled in the mold so as to cover the overpack to form a cushioning material layer integrated with the overpack.

Further, the present invention is a waste body in which a vitrified body is housed in an overpack in order to safely and easily dispose of the waste body in a geological formation, and a cushioning material covering the periphery of the overpack is compacted. This was achieved by having a cushioning layer integrated with the overpack.

Hereinafter, the waste 1 according to an embodiment of the present invention will be described with reference to the drawings. In the following examples, when the number, numerical value, quantity, range, etc. of the components are referred to, the specific number is used unless it is clearly stated or in principle it is clearly limited to a specific number. It is not limited, and may be more than or less than a specific number.

In addition, when referring to the shape and positional relationship of components, etc., unless otherwise specified or when it is considered that this is not the case in principle, those that are substantially similar to or similar to the shape, etc. shall be used. Including.

In addition, the drawings may be exaggerated by enlarging the characteristic parts in order to make the features easy to understand, and the dimensional ratios and the like of the components are not always the same as the actual ones.

1 (a) is a perspective view schematically showing the waste body 1, and FIG. 1 (b) is a vertical sectional view of FIG. 1 (a).

In the reprocessing process of spent nuclear fuel, waste liquid with high radioactivity level is generated. The waste body 1 includes a vitrified body 2 obtained by vitrifying the waste liquid and an overpack 3 containing the vitrified body 2.

The vitrified body 2 is a stainless steel canister filled with radionuclides and fixed uniformly and stably, and suppresses elution of radionuclides into groundwater. In addition, radionuclides can be stably fixed to heat and radiation.

The overpack 3 is made of carbon steel and is closed with a lid 3a to accommodate the vitrified body 2 inside. The physical and chemical buffering function of the overpack 3 protects the vitrified body 2 and prevents contact between the groundwater and the vitrified body 2. In addition, the movement of radionuclides is suppressed by accumulating the radionuclides eluted in the groundwater.

The waste body 1 includes a cushioning material layer 4 integrated with the overpack 3. The cushioning material layer 4 is mainly composed of bentonite and silica sand. The cushioning material layer 4 is integrated with the overpack 3 by being compacted on the outer periphery of the overpack 3, that is, the cushioning material layer 4 covers the overpack 3 without a gap between the cushioning material layer 4 and the overpack 3. It is adhered to the outer circumference of the overpack 3. Further, the cushioning material layer 4 is integrated so as to seamlessly cover the periphery of the overpack 3. As a result, when the radionuclides are eluted into the groundwater, the cushioning material layer 4 accommodates the radionuclides, so that the movement of the radionuclides can be suppressed.

The external dimensions of the waste body 1 can be reduced to about 1/2 in diameter and about 1/3 in length as compared with the PEM type waste. Further, the weight of the waste body 1 can be reduced to about 1/3 as compared with the PEM type waste body.

Since the compressed cushioning material layer 4 is in contact with the outer periphery of the overpack 3, it is not necessary to inflate the cushioning material by infiltration of groundwater to close the gap unlike the conventional block method and spray method, so that the cushioning material layer 4 is discarded. Immediately after the body 1 is placed, the cushioning function of the cushioning material layer 4 can be obtained.

Further, since the cushioning material layer 4 is in contact with the overpack 3, the heat (about 350 W / piece) generated from the vitrified body 2 is smoothly transferred to the outside, so that the cushioning material layer 4 is excessively heated. It is possible to suppress a decrease in the cushioning function of the cushioning material layer 4 due to this.

Further, since the cushioning material layer 4 is in contact with the overpack 3, it is possible to prevent the formation of a groundwater passage at the boundary between the overpack 3 and the cushioning material layer 4 when the groundwater is infiltrated by re-flooding. , The outflow of cushioning material due to piping and erosion can be suppressed.

Next, the method for producing the waste 1 according to the first embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a flowchart showing a procedure for producing the waste 1 according to the present embodiment. 3A to 3H are partial cross-sectional views schematically showing a procedure for producing the waste 1 according to the present embodiment.

First, as shown in FIG. 3A, a mold 10 corresponding to the outer shape of the waste 1 is prepared, and a cushioning material 4a is spread on the bottom of the mold 10 (S1). The mold 10 is formed in a bottomed tubular shape and is configured to be divisible. The cushioning material 4a is preferably rolled out into a thin layer and pressed statically. In addition, "statically pressing" means applying static pressure to the cushioning material 4a, that is, continuing to press with a constant external force. By repeating this, the cushioning material 4a is compressed at a high density to form the cushioning material layer 4. The magnitude of the static pressure can be arbitrarily changed according to the cushioning function applied to the cushioning material layer 4.

Next, as shown in FIG. 3B, the overpack 3 is installed on the cushioning material layer 4 at the bottom of the mold 10 (S2), and the cushioning material 4a is placed between the overpack 3 and the mold 10. Spread out (S3). The overpack 3 is arranged substantially in the center of the mold 10. By repeatedly sprinkling the cushioning material 4a into a thin layer and applying static pressure to the cushioning material 4a, that is, by repeating sprinkling and static pressing of the cushioning material 4a, the cushioning material 4a is compressed at a high density. The cushioning material layer 4 is formed, and the cushioning material layer 4 is integrated with the outer periphery of the overpack 3. The cushioning material layer 4 is formed lower than the upper end surface of the overpack 3 due to the installation of the lid 3a described later.

Next, as shown in FIG. 3C, the vitrified body 2 is suspended by a crane or the like (not shown) and housed in the overpack 3 (S4).

Next, as shown in FIG. 3D, the overpack 3 is closed (S5). By welding the lid 3a to the overpack 3, the vitrified body 2 is sealed in the overpack 2.

Then, as shown in FIG. 3 (e), the cushioning material 4a is spread around the overpack 3 (S6). When the waste body 1 is placed vertically, the cushioning material 4a is filled so as to expose only the surface of the lid 3a, and the cushioning material 4a is sprinkled into a thin layer to apply static pressure to the cushioning material 4a. By repeating this process, the cushioning material 4a is compressed at a high density to form the cushioning material layer 4, and the cushioning material layer 4 is integrated with the overpack 3 so as to seamlessly cover the periphery of the overpack 3. To.

After that, as shown in FIG. 3F, by removing the mold 10 from the mold 10, it is possible to obtain the waste 1 in which the cushioning material layer 4 is integrated on the outer periphery of the overpack 3. Since the overpack 3 is arranged substantially in the center of the mold 10, the cushioning material layer 4 covering the overpack 3 is formed to have a substantially uniform thickness. It is preferable that the mold 10 is removed immediately before the waste 1 is placed, and the exposed lid 3a is gripped by a crane or the like to place the waste 1.

The cushioning material layer 4 may be frozen in advance when the mold 10 is removed from the mold. As a result, it is possible to prevent the cushioning material layer 4 from collapsing after the mold 10 is removed from the mold.

When the waste 1 is placed horizontally, in step S6, as shown in FIG. 3 (g), the cushioning material layer 4 is formed so as to fill the lid 3a, and the waste 1 and the mold 1 are formed. After tilting the frame 10, as shown in FIG. 3H, the mold 10 is removed from the mold to obtain a waste body 1 in which the cushioning material layer 4 is integrated on the outer periphery of the overpack 3. Can be done.

Next, the method for producing the waste 1 according to the second embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a flowchart showing a procedure for manufacturing the waste 1 according to the present embodiment. 5 (a) to 5 (h) are partial cross-sectional views schematically showing a procedure for producing the waste 1 according to the present embodiment.

First, as shown in FIG. 5A, the vitrified body 2 is inserted into the overpack 3 (S10). Then, as shown in FIG. 5B, the overpack 3 is closed (S11). By welding the lid 3a to the overpack 3, the vitrified body 2 is sealed in the overpack 2.

Next, as shown in FIG. 5C, a mold 10 corresponding to the outer shape of the waste 1 is prepared, and a cushioning material 4a is spread on the bottom of the mold 10 (S12). The mold 10 is formed in a bottomed tubular shape and is configured to be divisible. By repeatedly rolling out the cushioning material 4a into a thin layer and applying static pressure to the cushioning material 4a, the cushioning material 4a is compressed at a high density to form the cushioning material layer 4.

Next, as shown in FIG. 5D, the overpack 3 is installed on the cushioning material layer 4 at the bottom of the mold 10 (S13). The overpack 3 is arranged substantially in the center of the mold 10.

Next, as shown in FIG. 5 (e), the cushioning material 4a is spread between the overpack 3 and the mold 10 (S14). By repeatedly sprinkling the cushioning material 4a into a thin layer and applying static pressure to the cushioning material 4a, the cushioning material 4a is compressed at a high density to form the cushioning material layer 4, and the cushioning material layer 4 is formed. Is integrated with the overpack 3 so as to seamlessly cover the periphery of the overpack 3 (S15).

After that, as shown in FIG. 5 (f), by removing the mold 10 from the mold 10, it is possible to obtain the waste 1 in which the cushioning material layer 4 is integrated on the outer periphery of the overpack 3. Since the overpack 3 is arranged substantially in the center of the mold 10, the cushioning material layer 4 covering the overpack 3 is formed to have a substantially uniform thickness. It is preferable that the mold 10 is removed immediately before the waste 1 is placed, and the exposed lid 3a is gripped by a crane or the like to place the waste 1.

The cushioning material layer 4 may be frozen in advance when the mold 10 is removed from the mold. As a result, it is possible to prevent the cushioning material layer 4 from collapsing after the mold 10 is removed from the mold.

When the waste 1 is placed horizontally, the cushioning material layer 4 is formed in step S14 so that the lid portion 3a is filled as shown in FIG. 5 (g). Then, after tilting the waste body 1 and the mold 10, the mold 10 was removed from the mold 10 as shown in FIG. 5 (h), and the cushioning material layer 4 was integrated on the outer periphery of the overpack 3. Waste 1 can be obtained.

In each example of producing the waste 1 described above, the cushioning material layer 4 formed by applying static pressure to the cushioning material 4a has been described as an example, but the cushioning material layer 4 is formed on the cushioning material 4a. It may be formed by intermittently applying an external force, that is, by dynamically pressing the cushioning material 4a.

Further, by preparing a mold 10 according to a desired shape (for example, a square pillar or the like) of the cushioning material layer 4, the shape of the waste body 1 is formed to be suitable for the stationary work of the waste body 1 described later. Can be done.

Next, a procedure for vertically geologically disposing of the waste 1 according to an embodiment of the present invention will be described with reference to FIG.

First, as shown in FIG. 6A, the bottom cushioning material block 22 and the intermediate cushioning material block 23 are installed in the disposal hole 21 of the disposal tunnel 20.

The disposal tunnel 20 and the disposal hole 21 are formed by excavating rock, and the diameter of the disposal hole 21 is set to, for example, about 2 m. The disposal hole 21 is formed by being dug vertically from the disposal tunnel 20.

The bottom cushioning material block 22 and the intermediate cushioning material block 23 are obtained by solidifying a cushioning material such as bentonite into a predetermined shape in advance, and are formed to have substantially the same diameter as the disposal hole 21. The bottom cushioning material block 22 is formed in a disk shape. The intermediate cushioning material block 23 is formed in an annular shape, and by stacking the intermediate cushioning material block 23 on the bottom cushioning material block 22, a stationary position A of the waste 1 is formed in the center of the intermediate cushioning material block 23. To.

Next, as shown in FIG. 6B, the waste 1 is placed vertically in the stationary position A. A relatively large gap is secured between the waste body 1 and the intermediate cushioning material block 23, and the positioning accuracy when the waste body 1 is placed is relaxed.

Then, as shown in FIG. 6C, a disk-shaped upper cushioning material block 24 is installed so as to cover the waste body 1. The upper cushioning material block 24 is obtained by solidifying the cushioning material into a predetermined shape in advance. Then, the gaps between the waste body 1, the disposal hole 21, and the cushioning material blocks 22, 23, and 24 are filled with a filler mainly composed of bentonite.

After that, the disposal tunnel 20 is closed with a backfill material. The cushioning material blocks 22, 23, and 24 are not limited to those individually formed in a disk shape or an annular shape, and for example, parts divided into two or more are combined to form a disk shape or an annular shape. It does not matter if it is presented.

Next, a procedure for laterally geologically disposing of the waste 1 according to an embodiment of the present invention will be described with reference to FIG. 7.

First, as shown in FIG. 7A, the front cushioning material block 31 and the bottom cushioning material block 32 are installed in the disposal tunnel 30 having a diameter of about 2 m formed by excavating the bedrock. The front cushioning material block 31 and the bottom cushioning material block 32 are obtained by solidifying the cushioning material into a predetermined shape in advance.

The front cushioning material block 31 is formed in a disk shape having substantially the same diameter as the disposal tunnel 30. When the waste 1 is continuously placed in the disposal tunnel 30 at predetermined intervals (for example, 3 m), the front cushioning material block 31 closes the front waste 1 to be described later. It may also be used as the cushioning material block 34.

The bottom cushioning material block 32 is a flat plate formed in a substantially rectangular shape. In this embodiment, the stationary position B of the waste 1 is formed on the bottom cushioning material block 32.

Next, as shown in FIG. 7B, the waste 1 is placed on the stationary position B. A relatively large gap is secured between the waste body 1 and the upper cushioning material block 33 described later, and the positioning accuracy when the waste body 1 is placed is relaxed.

Then, as shown in FIG. 7C, a U-shaped upper cushioning material block 33 and a disk-shaped rear cushioning material block 34 are installed so as to cover the waste body 1. The upper cushioning material block 33 and the rear cushioning material block 34 are obtained by solidifying the cushioning material into a predetermined shape in advance.

Then, the gaps between the waste body 1, the disposal tunnel 30, and the cushioning material blocks 31, 32, 33, and 34 are filled with a filler mainly composed of bentonite. The cushioning material blocks 31, 32, 33, and 34 are not limited to those individually formed in a disk shape, a flat plate shape, or a U shape, and for example, a disk plate obtained by combining parts divided into two or more. It may have a shape, a flat plate shape, or a U-shape.

In this way, according to the above-mentioned disposal method in which the waste 1 is placed vertically or horizontally, the geological disposal using the conventional PEM method substantially matches the outer diameter of the steel cell with the inner diameter of the disposal tunnel. In order to dispose of the waste in the geological formation, the steel cells must be carefully transported into the disposal tunnel, and the inner peripheral surface of the disposal tunnel must be formed smoothly. While there was a problem that the disposal cost of the waste 1 tended to increase, the waste 1 was miniaturized to improve the handleability, and the contact between the waste 1 and the disposal tunnel 20 was suppressed. Therefore, it is not necessary to form the inner peripheral wall of the disposal tunnel 20 smoothly, and the disposal cost of the waste 1 can be greatly reduced as compared with the PEM method.

Further, the present invention can be modified in various ways without departing from the spirit of the present invention, and it is natural that the present invention extends to the modified ones.

1 ・ ・ ・ Waste 2 ・ ・ ・ Vitrified 3 ・ ・ ・ Overpack 4 ・ ・ ・ Cushioning material layer 4a ・ ・ ・ Cushioning material 10 ・ ・ ・ Mold 20 ・ ・ ・ Disposal tunnel 21 ・ ・ ・ Disposal hole 22 ... Bottom cushioning material block 23 ... Intermediate cushioning material block 24 ... Top cushioning material block 30 ... Disposal tunnel 31 ... Front cushioning material block 32 ... Bottom cushioning material block 33 ...・ Upper cushioning material block 34 ・ ・ ・ Rear cushioning material block A, B ・ ・ ・ Stationary position

Claims (7)

It is a method of manufacturing a waste body in which a vitrified body is housed in an overpack.
The process of installing the overpack in the formwork and
A step of filling a cushioning material between the overpack and the mold,
A step of accommodating the vitrified body in the overpack and closing the overpack,
A step of compressing the cushioning material filled in the mold so as to cover the overpack to form a cushioning material layer integrated with the overpack.
A step of removing the mold after integrating the overpack and the cushioning material,
A method for producing a waste product, which comprises. It is a method of manufacturing a waste body in which a vitrified body is housed in an overpack.
The process of installing the waste in the mold and
A step of compressing the cushioning material filled in the mold so as to cover the overpack to form a cushioning material layer integrated with the overpack.
A method for producing a waste product, which comprises a step of demolding the mold after integrating the overpack and the cushioning material. It is a method of manufacturing a waste body in which a vitrified body is housed in an overpack.
The process of installing the overpack in the formwork and
A step of filling a cushioning material between the overpack and the mold,
A step of accommodating the vitrified body in the overpack and closing the overpack,
A step of compressing the cushioning material filled in the mold so as to cover the overpack with static pressure to form a cushioning material layer integrated with the overpack.
A method for producing a waste product, which comprises. It is a method of manufacturing a waste body in which a vitrified body is housed in an overpack.
The process of installing the waste in the mold and
A step of compressing the cushioning material filled in the mold so as to cover the overpack with static pressure to form a cushioning material layer integrated with the overpack.
A method for producing a waste product, which comprises. The method for producing a waste according to any one of claims 1 to 4, further comprising a step of freezing the cushioning material. A method for disposing of waste, in which the waste obtained by the manufacturing method according to any one of claims 1 to 5 is placed in a disposal tunnel.
A step of installing a cushioning material block in the disposal tunnel so as to form a stationary position for placing the waste body, and
The process of placing the waste in the stationary position and
The process of covering the waste with a cushioning material block and
The step of filling the space between the waste, the disposal tunnel, and the cushioning material block with a filler, and
A method of disposing of waste, characterized in that it contains. The method for disposing of waste according to claim 6, wherein the cushioning material block is interposed between at least the waste body and the inner peripheral wall of the disposal tunnel.