JP6011866B2 - Disposal tunnel for waste burial and method for burying waste - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a disposal tunnel for burying waste and a method for burying and disposing of waste. In particular, the present invention relates to a radioactive waste integrated with a buffer material in which the periphery of the radioactive waste is surrounded by a buffer material. The present invention relates to a disposal tunnel suitable for disposal, and a disposal method for the disposal of waste.

  In geological disposal of high-level radioactive waste, bentonite-based clay material called buffer material surrounds the waste body to buffer the earth pressure from the surrounding area, suppress infiltration of groundwater, and leak radioactive materials from the waste body (For example, refer nonpatent literature 1).

  In the horizontal-type high-level radioactive waste disposal facility, for example, as shown in FIG. 7, in the disposal facility planned for the main shaft 1 and the disposal shaft 2 and the waste body arrangement, the buffer-integrated waste body in advance A method is considered in which after 3 is created, it is carried into the disposal tunnel 2 and placed. Alternatively, as shown in FIG. 8, the buffer material block 4 and the waste body 5 are separately carried into the mine, and after the buffer material block 4 is assembled in the disposal tunnel 2, the waste body 5 is inserted and placed. It has been.

  In the buffer material-integrated waste body placement method of FIG. 7 and also in the buffer material block and waste body placement method of FIG. 8, the waste body and the buffer material for placement are transported into the disposal tunnel 2. In order to be placed at the correct position, a cross section of the tunnel having a sufficient clearance with respect to the size of the buffer material integrated waste body 3 or the buffer material block 4 and the waste body 5 is required. As a result, as shown in FIG. 9, a gap space (hereinafter referred to as “the inner circumference of the tunnel”) is provided between the cushioning material integrated waste body 3 (or the cushioning material block and the waste body) and the inner wall 2a of the disposal tunnel 2. The occurrence of C is unavoidable. Here, FIG. 9 (1) is a case where there is no pedestal, (2) is a case where there is a single pedestal 6 at the center of the bottom of the mine, and (3) is a case where there are two pedestals 7 on the left and right of the bottom of the mine. is there. This “tunnel inner circumferential clearance” C needs to be filled and sealed in as short a time as possible with a bentonite material having a water-absorbing property and a water-absorbing property because of the following reasons (1) to (3).

(1) Since there is a “groove inner circumferential clearance” after being placed in the tunnel, the movement of the cylindrical cushioning material integrated waste cannot be suppressed.
(2) If a space remains in the “inner pit clearance”, when the support work is deteriorated or the ground deformation starts, the bias pressure acts to impair the soundness of the waste.
(3) Since the “clearance inside the mine tunnel” tends to be a passage for groundwater, it tends to be a route that easily moves out of the facility when radioactive materials leak from the waste in the future.

  As a means for solving such a problem, there is a method in which pellets made of bentonite-based material are filled in an “inner gap on the inner periphery of a tunnel” as in Patent Document 1.

  A technique for actually filling the pellets is reported in Non-Patent Document 2, and a diameter of 20 mm is formed in a mold simulating an actual inner space clearance of a mine shaft as shown on the left side of FIG. 10-1. It has been confirmed that filling with a packing density distribution as shown in FIG. 10-2 can be achieved by blowing and filling a pellet material (right side of the figure) in which a grade pellet and a 1 mm grade pellet are premixed at a ratio of 6: 4. In FIG. 10-2, the packing density actual measurement value by two types of pellet conveying methods (pneumatic feeding round flow, mechanical aerobayer) in the case of a gap height (gap width) of 300 mm is shown.

Pellets can be filled to a packing density of 1.37 Mg / m ³ (dry density) or more if a pellet transport method using pneumatic round blow is applied in a space where the width of the inner peripheral clearance is 50 mm or more. Therefore, the pellet filling method is a method that can be realized as a filling method of bentonite having water-absorbing expansibility in the inner space of the mine shaft. However, it has been a problem that it is difficult to fill the pellets in the inner circumferential clearance of the narrow tunnel at the bottom.

  By the way, about the method of carrying in and placing a buffer material and a waste body in a tunnel, the following patent documents 2-4, Japanese Patent Application No. 2012-4173, Japanese Patent Application No. 2012-123506, and Japanese Patent Application No. 2012 are pending. The method described in 198884 has already been proposed. These are all methods for providing a pedestal for installation in a tunnel.

  The “cylindrical impermeable layer” described in Patent Document 2 is a structure in which a plurality of buffer material blocks 4a as shown in FIG. 11-1 are separately carried into the mine, and the pedestal 8 provided at the bottom of the mine shaft is provided. It is a method of placing in order, assembling into a hollow cylindrical shape as shown in FIG. 11-2, and then inserting the waste body 5 into the hollow portion and placing it as shown in FIG. 11-3. The pedestal 8 extends in the direction of mine shaft extension.

  The “disc-shaped cushioning material block, disc-shaped cushioning material block manufacturing method and waste body-integrated cushioning material manufacturing method” described in Patent Document 3 uses a bentonite-based material 9 as shown in FIG. A disk-type cushioning material 11 having a shell ring frame 10 or a hollow disk-type cushioning material 12 is manufactured, and one by one is carried into the tunnel 2 by the transport device 13 as shown in FIG. In this method, assembly is performed on the base 7 extended in the extending direction, and then the waste body 5 is inserted into the hollow portion and fixed.

  Alternatively, as in FIG. 12-1, the shock absorbers 11 and 12 having the disk-shaped or hollow disk-shaped steel shell ring frame are manufactured, and the shock absorber integrated waste body 3 is assembled in advance as shown in FIG. Then, after that, as shown in FIG. 13-2, it is a method of carrying in the tunnel 2 and placing it on the pedestal 7 extended in the tunnel extension direction.

  As shown in FIG. 14-1, “Waste Package Manufacturing Method, Cylindrical Waste Package, and Cylindrical Waste Package Embedding Facility” described in Patent Document 4 is not integrated into a ring shape and is integrated as a cushioning material. 14 is constructed by rolling the Rama R, and the waste body 5 is inserted into the hollow portion thereof to assemble the cushioning material integrated waste body 3 in advance, and then inside the tunnel 2 as shown in FIG. And is placed on the pedestal 15 extended in the direction of the mine shaft extension.

  In the techniques of Patent Documents 2 to 4, a method is adopted in which a pedestal for placement in a tunnel is extended in the direction of the tunnel and placed on this pedestal.

  In addition, the pedestal 6 in the center of the bottom as shown in FIG. 15 in “Application Conveying Device and Conveying Method and Underground Conveying Trouble Relief Device and Relieving Method” of Japanese Patent Application No. 2012-4173, which is pending for the conveying device. A method of disposing the transport device 16 on the left and right sides of the vehicle and transporting it on the intermediate travel surface 2b, and a method of transporting by disposing the transport device 17 between the pedestals 7 on the left and right of the bottom as shown in FIG. Has been.

  In addition, after placing a buffer material integrated waste body in a tunnel, the tunnel is backfilled and transferred to disposal. For that purpose, it is necessary to backfill the inner peripheral clearance of the mine shaft with a water shielding material. As for the backfilling method for this purpose, Japanese Patent Application No. 2012-123506 “Waste body embedding disposal facility and waste body embedding disposal method”, Japanese Patent Application No. 2012-199884 “Water injection to gap filling material”. Several techniques have been proposed in "Method".

JP 2007-319732 A Japanese Patent No. 4743401 Japanese Patent No. 4780446 Japanese Patent No. 4730602

"Technical reliability of geological disposal of high-level radioactive waste in Japan-Geological disposal research and development 2nd report-General report", Nuclear Fuel Cycle Development Organization, November 1999 Tomonori Toguri, Hitoshi Kageyama, Eiichi Asano et al., “Study on filling method of bentonite pellets into the gap around buffer material in horizontal placement method”, Summary of 63rd Annual Conference of Japan Society of Civil Engineers CS05-12, pp . 191-192, September 2008

  In the example of the shape of the inner circumferential clearance C as shown in FIG. 9, a pedestal is provided at the bottom from the results of the experiments shown in FIGS. It is effective to place a waste or a buffer-integrated waste, and the space inside the tunnel is filled with pellets of various particle sizes that are formed by processing a water-absorbing expansive clay like a bentonite pellet into a spherical shape. Thus, the filling can be performed so that the filling density becomes a certain value or more. However, as shown in FIG. 16, when the pedestal 7 is arranged on the left and right of the bottom of the mine shaft, it is difficult to continuously fill the gap at the bottom center between the left and right pedestals 7 with pellets.

  In the conventional example, as described in Patent Document 4 described above, an insertion filling method of a bentonite block formed into a flat shape for the bottom center gap as shown in FIG. 17 has been proposed. In this method, a filler 18 made of a cement-based or clay-based material is filled in a gap between the tunnel inner wall 2a and the buffer material integrated waste body 3. Here, in FIG. 17, reference numeral 18 a on the upper side of the waste body indicates the filler 18 when sprayed, and reference numeral 18 b on the lower side of the waste body indicates the filler 18 when inserted in a flat block shape.

  When pellets are dropped and filled from the top edge of the gap space above the left and right pedestals, if the gap at the center of the bottom sandwiched between the left and right pedestals can be filled with pellets, it is efficient because it is a continuous operation And uniform pellet filling can be realized. The method for that has not been clarified so far.

  The present invention has been made in view of the above, and provides a waste burial disposal tunnel and a waste burial disposal method capable of realizing efficient and homogeneous filling of a pit inner circumferential clearance. For the purpose.

  In order to solve the above-described problems and achieve the object, a disposal mine for burying waste according to the present invention is a disposal mine for burying waste, and a pedestal for placing the waste is provided. The pedestal has a skeleton structure that extends in the direction of the mine shaft extension at a position spaced from the left and right of the bottom of the mine shaft as viewed in the direction of the mine shaft extension, and is a combination of rod-like elements.

  Further, another disposal tunnel for burying a waste body according to the present invention is characterized in that, in the above-described invention, a working scaffold plate is detachably provided on the pedestal.

  Further, according to the disposal mine for burying another waste body according to the present invention, in the above-described invention, a granular water-impervious material filled in a gap space between the inner wall of the mine tunnel and the waste body passes through the pedestal. A working scaffold plate having a possible stitch structure or slit structure is provided.

  Further, in the above-described invention, the disposal mine for burying a waste body according to the present invention travels in the gap space between the inner wall of the mine tunnel and the waste body in the extension direction in the pedestal. A guide plate is provided for guiding the travel of the transporting device that transports the transport.

  Further, the waste disposal method according to the present invention is a method of embedding waste in the disposal tunnel for waste disposal described above, after placing the waste on the pedestal in the tunnel. A granular water-impervious material is filled in a gap space between the inner wall of the tunnel and the waste body.

  According to the disposal tunnel for burying waste according to the present invention, the disposal tunnel for burying the waste includes a pedestal for placing the waste, and the pedestal includes a bottom of the mine as viewed in the direction of the mine channel extension. Since it is a frame structure that extends in the direction of the mine shaft at a position spaced apart on the left and right sides, and is a combination of rod-like elements, the inner rim clearance (gap space) between the waste and the inner wall of the mine shaft When the pellet (granular water shielding material) is dropped from the top edge of the inner periphery of this mine to fill it, the pellets that have fallen down to the left and right pedestals at the bottom of the mine pass through the frame structure of the pedestal. In order to reach the center of the bottom of the tunnel sandwiched between the left and right pedestals, the gap at the center of the bottom of the tunnel can be filled with pellets at a packing density equivalent to the inner peripheral clearance of the tunnel existing above the pedestal. it can. In addition, when dropping and filling pellets from the top end of the gap space above the pedestal, the gap space above the left and right pedestals and the gap space at the bottom center between the left and right pedestals are filled simultaneously. be able to. Therefore, there is an effect that it is possible to realize efficient and uniform filling with respect to the inner circumferential clearance of the tunnel.

  Moreover, according to the disposal mine for burying other waste bodies according to the present invention, in the above-described invention, since the working scaffolding plate is detachably provided on the pedestal, the mine is backfilled and closed. In the monitoring period, by attaching the scaffolding plates to the left and right pedestals, it becomes easier for the monitoring worker to walk and move in the tunnel. When refilling and closing the tunnel, the pellets pass through the frame structure of the left and right pedestals by removing the scaffolding plates from the left and right pedestals and then dropping and filling the pellets from the top edge of the inner periphery of the tunnel. Then, since it spills down to the center of the bottom, there is an effect that it is possible to fill the inner periphery of the tunnel at the center of the bottom and the inner periphery of the tunnel existing above the left and right pedestals with the same packing density with pellets.

  Further, according to another disposal tunnel for burying waste according to the present invention, in the above-described invention, a granular water-impervious material filled in the gap space between the inner wall of the tunnel and the waste in the pedestal. Since a working scaffold plate having a stitch structure or a slit structure that can pass through is provided, a monitoring worker can easily walk and move in the tunnel during the monitoring period until the tunnel is backfilled and closed. When the tunnel is backfilled and closed, the pellets are dropped and filled from the top edge of the inner perimeter of the tunnel, so that the pellets pass through the scaffolding plate of the stitch structure or slit structure, and further, the framework structure of the left and right pedestals Since it passes through and spills down to the center of the bottom, there is an effect that it is possible to fill the inner peripheral clearance of the tunnel at the center of the bottom and the inner peripheral clearance above the left and right pedestals with the same packing density with pellets. .

  According to another disposal burial for buried waste according to the present invention, in the above-described invention, the pedestal travels in the gap space between the inner wall of the mine shaft and the waste body in the direction of the mine shaft extension, and Since a guide plate is provided to guide the travel of the transport device that transports the waste, pellets (granular blockage) are formed from the top edge of the inner circumferential clearance in order to fill the inner circumferential clearance (clearance space). When the water material is dropped, the pellets that fall in the gap inside the tunnel are once dammed to the guide plate, but accumulate on the slope and eventually spill over the guide plate over the guide plate. Therefore, there is an effect that it is possible to fill the inner circumferential clearance of the tunnel at the center of the bottom portion and the inner circumferential clearance existing above the left and right pedestals with the same packing density with pellets.

  Further, according to the method for burying and disposing of waste according to the present invention, the method for burying and disposing of the waste in the disposal mine for burying waste described above, wherein the waste is placed on the pedestal in the mine shaft. After that, since the gap space between the inner wall of the tunnel and the waste is filled with a granular water shielding material, the pellet (granular water shielding material) is placed from the top end of the gap space (the inner circumferential gap). When dropped, the pellets spilled down to the left and right pedestals at the bottom of the mine will pass through the frame structure of the pedestal and reach the center of the bottom of the mine that is sandwiched between the left and right pedestals. The space can be filled with pellets at a packing density equivalent to the inner gallery clearance above the pedestal. In addition, when dropping and filling pellets from the top end of the gap space above the pedestal, the gap space above the left and right pedestals and the gap space at the bottom center between the left and right pedestals are filled simultaneously. be able to. Therefore, there is an effect that it is possible to realize efficient and uniform filling with respect to the inner circumferential clearance of the tunnel.

FIG. 1 is a schematic partial perspective view showing a waste burial disposal tunnel and a waste burial disposal method according to a first embodiment of the present invention. FIG. 2 is a schematic partial perspective view showing a waste tunnel burying disposal tunnel and a waste burying disposal method according to a second embodiment of the present invention. FIG. 3 is a schematic partial perspective view showing a third embodiment of a disposal mine for waste burial and a method for burying waste according to the present invention. FIG. 4 is a schematic diagram showing, in a cross-sectional view, a waste burial disposal tunnel and a waste burial disposal method according to the present invention in a cross-sectional view, (1) is a diagram immediately after the start of pellet filling, (2 ) Is a diagram of the first half when filling pellets, and (3) is a diagram of a state in which filling of the gap at the bottom of the inner periphery of the mine has been completed. FIG. 5 is a photographic view showing an experiment in which pellets are spilled and fallen into a slope shape. FIG. 6-1 is a photograph showing an experiment of passing pellets through a stitch board. FIG. 6B is a photograph of a passing experiment for a plate having a stitch interval of 22.4 mm. FIG. 6-3 is a photograph of a passing experiment for a plate having a stitch interval of 26.5 mm. FIG. 6-4 is a photograph of a case where large and small 2 particle size pellets are alternately filled in four layers. FIG. 7 is a diagram illustrating an example of a transfer and placement example of a buffer material-integrated waste body in a conventional horizontal placement type high-level radioactive waste disposal facility. FIG. 8 is a diagram illustrating an example of the transportation and placement of the buffer material block and the waste body in the conventional horizontal placement type high-level radioactive waste disposal facility. FIG. 9 is a cross-sectional view showing an example of the inner circumferential clearance space between the buffer material-integrated waste body and the inner wall of the tunnel, where (1) has no pedestal and (2) has one strip at the center of the bottom. (3) is a figure when there are two pedestals on the left and right sides of the bottom. FIG. 10-1 is a diagram showing an experimental example in which bentonite pellets are filled in a form simulating a full-size gallery inner circumferential clearance space, the left side is an external view of the simulated form, and the right side is a view of the pellet filling surface. It is. 10-2 is a figure which shows the experimental result of the bentonite pellet packing density to a gallery inner periphery clearance gap. FIG. 11A is a cross-sectional view illustrating an example of a method for carrying in and placing a conventional cushioning material and a waste body into a tunnel. FIG. 11-2 is a longitudinal cross-sectional view illustrating an example of a method for carrying in and placing a conventional cushioning material and waste into a mine shaft. FIG. 11C is a longitudinal cross-sectional view illustrating an example of a method for carrying in and placing a conventional cushioning material and waste into a mine shaft. FIG. 12A is a diagram illustrating an example of a manufacturing process of a conventional disk-type or hollow disk-type cushioning material, (1) is a manufacturing process diagram of a disk-type cushioning material, and (2) is a hollow disk-type cushioning material. The production process diagram of the cushioning material, (3) is a transverse sectional view of the disk-shaped cushioning material, (4) is a transverse sectional view of the hollow disk-shaped cushioning material. 12-2 is a schematic view of a method for carrying the buffer material and waste body produced in the step of FIG. 12-1 into a tunnel and placing them, (1) is a longitudinal sectional view, and (2) is a transverse section. FIG. FIG. 13A is a diagram illustrating an example of a manufacturing process of a conventional cushioning material integrated waste body. FIG. 13-2 is a schematic view of a method for carrying the buffer material integrated waste body manufactured in the process of FIG. 13-1 into a tunnel and placing it, (1) is a cross-sectional view, and (2) is a longitudinal section. FIG. FIGS. 14A and 14B are process diagrams showing an example in the case of constructing a conventional integrated cushioning material by rolling, (1) is a first half view when forming a hollow portion, and (2) is when forming a hollow portion. (3) is a figure immediately after inserting a waste body in a hollow part, (4) is a figure after (3). FIG. 14-2 is a schematic view of a method for carrying in and placing the cushioning material integrated waste body produced in the process of FIG. 14-1 into the tunnel, (1) is a cross-sectional view, and (2) is the carrying-in. (3) is a longitudinal sectional view immediately after carrying in. FIG. 15 is a diagram showing a conventional pedestal guide rail for conveyance and a travel position (central pedestal system) of the conveyance device. FIG. 16 is a diagram illustrating a conventional transfer pedestal guide rail and a travel position (left and right pedestal system) of the transfer device. FIG. 17 is a vertical cross-sectional view showing an example of a conventional filling method for the inner circumferential clearance of a mine shaft.

  EMBODIMENT OF THE INVENTION Below, the embodiment (Examples 1-4) of the disposal mine for waste burial and the disposal method of a waste body which concerns on this invention is described based on drawing. Note that the present invention is not limited to the embodiments.

[Example 1]
As shown in FIG. 1, the disposal tunnel 100 for embedding waste according to the first embodiment of the present invention is a horizontal tunnel-type disposal tunnel for embedding radioactive waste 20, and places the waste 20 in a stationary manner. A skeleton structure comprising a pedestal 22 for extending in the mine shaft extension direction at positions spaced apart from each other on the left and right sides of the mine bottom 24 in the mine shaft extension direction view. It is.

  In addition, the waste disposal method according to the first embodiment of the present invention is a method for embedding the waste body 20 in the disposal tunnel 100 for waste body embedding described above, and the waste body 20 is disposed on the pedestal 22. After the placement, the pit inner circumferential gap C (gap space) between the mine inner wall 28 and the waste body 20 is filled with granular pellets (granular water shielding material) made of bentonite-based material.

  Here, the radioactive waste body 20 may be a radioactive waste body integrated with a buffer material manufactured in advance, or may be a radioactive waste body assembled in a tunnel by a buffer material block and a waste body. .

  FIG. 5 shows an experiment in which pellets are spilled into a slope. The situation in which the pellets fall and gradually accumulate is shown in each stage (1), (2), (3), (4), (5), (6) along the passage of time. As shown in FIG. 5, when a pellet is dropped from the same point on the upper right side of a transparent square container having an open top, it accumulates while forming a slope in the container. It can be seen that in each of the stages (1), (2), (3), (4), (5), and (6), the inclination angle of the inclined surface exhibits the same angle of repose of 30 degrees.

The operation and action of the above configuration will be described.
In order to fill a gallery inner circumferential gap C (gap space) between the waste body 20 and the mine inner wall 28, a granular pellet (granular) made of a bentonite-based material (not shown) from the top end 30 of the mine inner circumferential gap C. The pellets spilled down to the left and right pedestals 22 of the pit bottom 24 pass through the inside of the frame structure of the pedestal 22 and are sandwiched between the left and right pedestals 22. To reach. Therefore, the center gap C1 of the mine bottom 24 can be filled with pellets at a packing density equivalent to the mine inner circumferential gap C0 existing above the pedestal 22.

  In addition, when the pellet is dropped and filled from the top end 30 of the gap C0 above the pedestal 22, the gap C0 above the left and right pedestals 22 and the gap C1 at the center of the bottom 24 sandwiched between the left and right pedestals 22 are filled. Can be charged at the same time. Therefore, according to the first embodiment, it is possible to realize efficient and uniform filling with respect to the inner circumferential clearance C of the mine shaft.

[Example 2]
As shown in FIG. 2, the disposal mine 200 for embedding waste according to the second embodiment of the present invention is the one in which the working scaffold plate 32 is detachably provided on the left and right pedestals in the first embodiment described above. It is. The scaffolding plate 32 has a rectangular flat plate shape, and a plurality of scaffolding plates 32 are juxtaposed in the mine shaft extending direction in the mine inner circumferential clearance C on the pedestal.

  Here, in the example of FIG. 2, instead of the pedestal 22 of the first embodiment, a vertical columnar base 34a provided at a predetermined interval in the mine shaft extension direction and a horizontal frame portion 34b for the scaffolding plate are included. Although the case where the pedestal 34 is employed is shown, the horizontal frame 34b shown in FIG. 2 may be attached to the pedestal 22 of the first embodiment at predetermined intervals, and the working scaffold plate 32 may be detachably provided. I do not care.

  In addition, the waste disposal method according to the second embodiment of the present invention is a method of embedding the waste body 20 in the disposal tunnel 200 for waste body embedding described above, and the waste body 20 is disposed on the pedestal 34. After the placement, the pit inner circumferential clearance C between the mine inner wall 28 and the waste body 20 is filled with granular pellets (granular water shielding material) made of bentonite material.

The operation and action of the above configuration will be described.
In the monitoring period until the tunnel is refilled and closed, the scaffolding plates 32 are attached to the left and right pedestals 34, so that the monitoring worker P can easily move by walking in the tunnel. When the tunnel is backfilled and closed, the scaffolding plate 32 is removed from the left and right pedestals 34, and then the pellet is left and right by dropping and filling a pellet (not shown) from the top end 30 of the inner circumferential clearance C. Since it passes through the frame structure of the pedestal 34 and spills down to the center of the bottom 24, the gallery inner circumferential clearance C1 at the center of the bottom 24 and the mine inner circumferential clearance C0 existing above the left and right pedestals 34 are equally filled with pellets. Can be filled with density.

  When the pellet is dropped and filled from the top end 30 of the clearance C0 above the pedestal 34, the clearance C0 above the left and right pedestals 34 and the clearance C1 at the center of the bottom 24 sandwiched between the left and right pedestals 34 are provided. Can be charged at the same time. Therefore, according to the second embodiment, it is possible to realize efficient and uniform filling of the inner circumferential clearance C of the mine shaft.

[Example 3]
As shown in FIG. 3, the disposal tunnel 300 for embedding a waste according to the third embodiment of the present invention is a granular pellet (granular water shielding) made of bentonite material on the left and right pedestals in the above-described first embodiment. A working scaffold plate 36 having a stitch structure or a slit structure through which a material having a size larger than the particle size of the material can pass is provided. Or it can be said that it was made into the stitch structure or slit structure which a pellet can pass instead of making the scaffold board 32 of Example 2 mentioned above into a removable structure.

  In the example of FIG. 3, the case where the pedestal 34 of the second embodiment is adopted as the pedestal is shown, but the horizontal frame portion 34b of FIG. 2 is attached to the pedestal 22 of the first embodiment at a predetermined interval. Of course, a scaffold plate 36 having a stitch structure or a slit structure may be provided.

The photographs of FIGS. 6-1 to 6-4 show the pellet passing experiment with respect to the stitch plate simulating the scaffold plate 36 having the stitch structure. In the procedure as shown in Fig. 6-1, for the transparent cylindrical container having an inner diameter of 100 mm and a height of 127 mm, the pellets having a maximum particle size of 22.4 mm or less and two kinds of 1 mm class pellets are divided into four layers. The cylinder when dropped separately and passed through a plate with a stitch interval of 22.4 mm as shown in FIG. 6-2 and when a plate with a stitch interval of 26.5 mm is passed as shown in FIG. 6-3 The packing density of the mold container was measured. Filling density in the former condition 1.5181Mg / ^{m 3,} became 1.5204Mg / ^{m 3} in the latter condition. In this way, the packing density was equal in both cases, but in the former case, large grains that could not pass through the stitch plate were generated as shown in FIG. Needs to be larger than the maximum particle size of the pellets.

Compared to the packing density of 1.5335 Mg / m ³ when large and small 2 particle size pellets of the same particle size are divided into 4 layers and filled alternately in the same cylindrical container as shown in Fig. 6-4 Then, it can be seen that a packing density of 1.5204 Mg / m ³ when a plate having a stitch interval of 26.5 mm is passed has achieved a packing density of 99.1%. That is, the structure of the stitch board with the stitch structure in the third embodiment is suitable for pellet filling.

  Further, the waste disposal method according to the third embodiment of the present invention is a method of embedding the waste body 20 in the disposal tunnel 300 for waste body embedding described above, and the waste body 20 is disposed on the pedestal 34. After placement, pellets are filled into the inner circumferential clearance C between the inner wall 28 of the tunnel and the waste body 20.

The operation and action of the above configuration will be described.
During the monitoring period until the tunnel is backfilled and closed, the monitoring worker P can easily move by walking in the tunnel. When the tunnel is backfilled and closed, the pellets are dropped and filled from the top end 30 of the inner circumferential clearance C, so that the pellets pass through the scaffolding plate 36 having a knitted structure or a slit structure, and the left and right pedestals 34 are further filled. Since this spills down to the center of the bottom 24 through the skeleton structure, the tunnel inner circumferential clearance C1 at the center of the bottom 24 and the tunnel inner circumferential clearance C0 existing above the left and right pedestals 34 are filled with the same packing density. Can be filled.

  When the pellet is dropped and filled from the top end 30 of the clearance C0 above the pedestal 34, the clearance C0 above the left and right pedestals 34 and the clearance C1 at the center of the bottom 24 sandwiched between the left and right pedestals 34 are provided. Can be charged at the same time. Therefore, according to the third embodiment, it is possible to realize efficient and uniform filling with respect to the inner circumferential clearance C of the mine shaft.

  In the above-described embodiment, the scaffold plate 36 itself having a stitch structure or a slit structure may be removable from the pedestal. Alternatively, a structure in which the stitch plate 36 having the stitch structure or the slit structure is provided on one of the left and right pedestals and the removable scaffold plate 32 of the above-described second embodiment is provided on the other may be adopted.

[Example 4]
As shown in FIG. 4 (1), the disposal mine 400 for burying wastes according to the fourth embodiment of the present invention is the inner side of the left and right pedestals 22 in the first embodiment (or the second or third embodiment). Is provided with a guide plate 38 extending in the direction of mine shaft extension. The guide plate 38 is for guiding the traveling of a transport device (not shown) that travels in the gallery inner circumferential clearance C1 in the center of the bottom 24 in the mine shaft extension direction and transports the waste body 20. Is provided along the lower portions of the left and right pedestals 22 on opposite sides. Instead of doing so, a guide device 38 is provided on each outer side of the left and right pedestals 22, and transports the waste body 20 by traveling in the gallery extension direction slightly above the pedestal inner circumferential clearance C0 ( You may comprise so that driving | running | working (not shown) may be guided.

  The waste disposal method according to the fourth embodiment of the present invention is a method for embedding the waste body 20 in the disposal tunnel 400 for waste body embedding described above, and the waste body 20 is disposed on the pedestal 22. After placement, pellets are filled into the inner circumferential clearance C between the inner wall 28 of the tunnel and the waste body 20.

The operation and action of the above configuration will be described.
As shown in FIG. 4 (1), in order to fill the tunnel inner circumferential gap C between the waste body 20 and the tunnel inner wall 28, when the pellet is dropped from the top end 30 of the tunnel inner circumferential gap C, Pellets that fall in the inner circumferential clearance C pass through the frame structure base 22, and are once dammed to the guide plate 38 extending in the direction of the mine shaft extension and accumulated in a slope shape. Then, as shown in FIG. 4 (2), the pellets eventually get over the guide plate 38 and spill into the inner circumferential clearance C 1 at the center of the bottom 24. Therefore, as shown in FIG. 4 (3), the gallery inner circumferential clearance C 1 at the center of the bottom portion 24 and the mine inner circumferential clearance C 0 existing above the left and right pedestals 22 are filled with the same packing density with pellets. Can do.

  Thus, even when the guide plate 38 extending in the direction of the tunnel is provided in order to give the pedestal 22 having the skeleton structure a function as a guide rail for the transport device, the guide plate 38 is filled with pellets. It will not be a barrier.

  In addition, when the pellet is dropped and filled from the top end 30 of the gap C0 above the pedestal 22, the gap C0 above the left and right pedestals 22 and the gap C1 at the center of the bottom 24 sandwiched between the left and right pedestals 22 are filled. Can be charged at the same time. Therefore, according to the fourth embodiment, it is possible to realize efficient and uniform filling with respect to the inner circumferential clearance C of the mine shaft.

  As described above, according to the disposal tunnel for burying waste according to the present invention, the disposal tunnel for burying the waste includes a pedestal for placing the waste, and the pedestal is a gallery. Since it is a frame structure that extends in the direction of the mine shaft at a position spaced from the left and right of the bottom of the mine shaft as viewed in the direction of the extension, and is a combination of rod-like elements, When the pellet (granular water shielding material) is dropped from the top end of the gallery inner circumferential clearance to fill the clearance (gap space), the pellets spilled to the left and right pedestals at the bottom of the gallery In order to reach the center of the bottom of the mine shaft that is sandwiched between the left and right pedestals through the inside of the framework structure, the gap space at the center of the bottom of this mine shaft has the same filling density as the inner peripheral clearance of the mine that exists above the pedestal. Filled with pellets Rukoto can. In addition, when dropping and filling pellets from the top end of the gap space above the pedestal, the gap space above the left and right pedestals and the gap space at the bottom center between the left and right pedestals are filled simultaneously. be able to. Therefore, it is possible to realize efficient and uniform filling with respect to the inner circumferential clearance of the tunnel.

  Moreover, according to the disposal mine for burying other waste bodies according to the present invention, in the above-described invention, since the working scaffolding plate is detachably provided on the pedestal, the mine is backfilled and closed. In the monitoring period, by attaching the scaffolding plates to the left and right pedestals, it becomes easier for the monitoring worker to walk and move in the tunnel. When refilling and closing the tunnel, the pellets pass through the frame structure of the left and right pedestals by removing the scaffolding plates from the left and right pedestals and then dropping and filling the pellets from the top edge of the inner periphery of the tunnel. Since it spills down to the center of the bottom part, the inner periphery gap of the tunnel at the center of the bottom part and the inner periphery gap of the tunnel existing above the left and right pedestals can be filled with the same packing density with pellets.

  Further, according to another disposal tunnel for burying waste according to the present invention, in the above-described invention, a granular water-impervious material filled in the gap space between the inner wall of the tunnel and the waste in the pedestal. Since a working scaffold plate having a stitch structure or a slit structure that can pass through is provided, a monitoring worker can easily walk and move in the tunnel during the monitoring period until the tunnel is backfilled and closed. When the tunnel is backfilled and closed, the pellets are dropped and filled from the top edge of the inner perimeter of the tunnel, so that the pellets pass through the scaffolding plate of the stitch structure or slit structure, and further, the framework structure of the left and right pedestals Since it passes through and spills down to the center of the bottom, the inner periphery of the tunnel at the center of the bottom and the inner periphery of the tunnel existing above the left and right pedestals can be filled with pellets at the same packing density.

  According to another disposal burial for buried waste according to the present invention, in the above-described invention, the pedestal travels in the gap space between the inner wall of the mine shaft and the waste body in the direction of the mine shaft extension, and Since a guide plate is provided to guide the travel of the transport device that transports the waste, pellets (granular blockage) are formed from the top edge of the inner circumferential clearance in order to fill the inner circumferential clearance (clearance space). When the water material is dropped, the pellets that fall in the gap inside the tunnel are once dammed up by the guide plate, but accumulate on a slope and eventually spill over the guide plate at the center of the bottom. Therefore, the inner periphery clearance of the tunnel in the center of the bottom and the inner periphery clearance of the tunnel existing above the left and right pedestals can be filled with the same packing density with pellets.

  Further, according to the method for burying and disposing of waste according to the present invention, the method for burying and disposing of the waste in the disposal mine for burying waste described above, wherein the waste is placed on the pedestal in the mine shaft. After that, since the gap space between the inner wall of the tunnel and the waste is filled with a granular water shielding material, the pellet (granular water shielding material) is placed from the top end of the gap space (the inner circumferential gap). When dropped, the pellets spilled down to the left and right pedestals at the bottom of the mine will pass through the frame structure of the pedestal and reach the center of the bottom of the mine that is sandwiched between the left and right pedestals. The space can be filled with pellets at a packing density equivalent to the inner gallery clearance above the pedestal. In addition, when dropping and filling pellets from the top end of the gap space above the pedestal, the gap space above the left and right pedestals and the gap space at the bottom center between the left and right pedestals are filled simultaneously. be able to. Therefore, it is possible to realize efficient and uniform filling with respect to the inner circumferential clearance of the tunnel.

  As described above, according to the present invention, the disposal mine for waste burial and the method for burying the waste body are embedded by embedding a buffer material-integrated radioactive waste body in which the periphery of the radioactive waste body is surrounded by the buffer material. It is useful for disposal, especially after placing waste on a pedestal that extends in the direction of the mine shaft at a distance from the left and right of the bottom of the mine shaft, and then in the clearance space between the inner wall of the mine shaft and the waste material. Suitable for filling granular water shielding material.

20 Radioactive waste (waste body)
22, 34 Base 24 Tunnel bottom 26 Bar-shaped element 28 Tunnel inner wall 30 Top end 32, 36 Scaffold plate 38 Guide plate C Clearance inside the tunnel (clearance space)
C1 Clearance inside the tunnel at the center of the bottom of the tunnel (clearance space)
C0 Inner clearance around the pedestal (clearance space)
100 Disposal tunnel for waste burial (Example 1)
200 Disposal tunnel for waste burial (Example 2)
300 Disposal tunnel for waste burial (Example 3)
400 Disposal tunnel for waste burial (Example 4)

Claims (5)

A disposal mine for burying waste,
The waste body is a radioactive waste body integrated with a buffer material or a radioactive waste body assembled with a buffer material block in a tunnel,
A frame comprising a pedestal for placing the waste body, the pedestal extending in the direction of the mine shaft extension at a position spaced from the left and right of the bottom of the mine shaft as viewed in the direction of the mine shaft extension, and a combination of rod-like elements Disposal tunnel for waste burial, characterized by its structure.   The disposal mine for burying a waste body according to claim 1, wherein a working scaffold plate is detachably provided on the pedestal.   The platform is provided with a working scaffold plate having a stitch structure or a slit structure through which a granular water shielding material filled in a gap space between the inner wall of the mine shaft and the waste body can pass. Item 3. A disposal mine for burying waste according to item 1 or 2.   The pedestal is provided with a guide plate for guiding the traveling of a transport device that travels in a gap space between the inner wall of the mine shaft and the waste body in the mine shaft extension direction and transports the waste body. The disposal mine for waste burial according to any one of claims 1 to 3. A method for the waste disposed underground in waste disposal in tunnels for buried according to any one of claims 1 to 4,
After placing the said waste on the pedestal in said tunnel, the gap space between the tunnel inner wall and said waste, burying disposal of waste, characterized in that filling water-barrier material of the granular .