JP6159301B2 - Processing method of radioactive material - Google Patents

Description

  The present invention relates to a method for treating a radioactive substance.

  Conventionally, as a treatment method of this kind, after adding a flocculant and mixing with contaminated water contaminated with radioactive substances, the solid content obtained by dehydration is transported to a temporary storage place for radioactive substances (for example, patents). Document 1) and a method for storing waste containing radioactive material in a storage container having a concrete shielding layer (for example, Patent Document 2) have been proposed.

  However, in the method of Patent Document 1, it is necessary to secure a storage place for storing the solid content after the treatment, and in the method of Patent Document 2, a limited area can be effectively used by enabling stacking. However, it is necessary to secure a storage place for the storage container as well.

  In addition, a method for embedding contaminants to which radioactive substances are attached (for example, Patent Documents 3 and 4) has been proposed. Similarly, it is necessary to secure a place for digging a drill hole, After digging and putting pollutants, it takes time to backfill.

  In addition to the above, the vitrified solidified vitrified radioactive waste generated from nuclear power plants, spent fuel reprocessing facilities, etc. and moored floating objects floating on the sea surface are connected, and the vitrified solidified material is deep seabed. Although a method for storing the vitrified body (for example, Patent Document 5) is not disclosed, a method for lowering the vitrified body to the deep sea floor is not disclosed. There is a problem that it takes time and effort.

JP 2013-178223 A JP 2014-102092 A JP 2014-102239 A JP 2002-6089 A JP-A-7-12998

  An object of the present invention is to solve the above-mentioned problems and to provide a method for treating a radioactive substance capable of efficiently treating the radioactive substance.

The invention according to claim 1 of the present invention is to collect water-bottomed mud containing radioactive material with a dredge, transport the collected mud to a treatment site, and from the mud containing the radioactive material at the treatment site, coarse particles. And then agglomerating the mud from which the coarse particles have been removed , storing the agglomerated mud in a container , storing the container in the water from which the mud was collected, and then mounting a plurality of the containers on a carriage And a location where the trolley is moved away from the trolley after the basin has been moved to a sea treatment location , and is provided with a seawater introduction port for introducing seawater therein and an opening / closing valve for opening and closing the seawater introduction port. The control means is operated to open the on-off valve, and the trolley is submerged in the sea floor by introducing seawater into the trolley from the seawater inlet .

The invention according to claim 2 of the present invention is characterized in that the container has a concrete layer.

The invention according to claim 3 of the present invention is characterized in that the agglomerated mud is packed in a bag, and the bag filled with the mud is stored in the container .

According to the configuration of the first aspect, by sinking a plurality of containers together with the carriage to the sea, it is possible to efficiently sink a large number of containers containing processed objects on the sea floor.

According to the structure of Claim 1 , seawater is introduce | transduced inside by operating a control means and opening an on-off valve , A work can be simply performed because a trolley sinks.

According to the structure of Claim 2, the intensity | strength with respect to a water pressure is securable with a concrete layer.

According to the configuration of claim 1 , by storing the container in the water from which the mud is collected, there is no need to select another intermediate storage place, and the mud containing the radioactive material is aggregated, stored in the container and stored in the water. Thus, in intermediate storage, mud containing radioactive material does not diffuse into water, radiation shielding effect by water is obtained, and an intermediate storage place having little influence on the surroundings is obtained. Thus, final disposal can be performed by sinking the box body stored in the intermediate storage place into the sea together with the carriage.

It is sectional drawing which shows Example 1 of this invention. It is a perspective view of the trolley which notched a part same as the above. It is explanatory drawing of an opening / closing operation part and a control means same as the above. FIG. 4A is a cross-sectional view for explaining the processing method. FIG. 4A shows a state where the trolley is towed by towing, and FIG. 4B shows a state where the craft is sunk. It is a perspective view of a scissors means and a processing apparatus same as the above. It is a cross-sectional explanatory drawing of a scissors means same as the above. It is a cross-sectional explanatory drawing of a processing apparatus same as the above. It is sectional drawing of a pressure reduction cyclone same as the above. It is sectional drawing of a dehydration means same as the above. It is a perspective view of a bag and a box body same as the above. It is sectional drawing which shows an underwater storage state same as the above. It is a block diagram explaining a processing method same as the above. It is sectional drawing which shows Example 2 of this invention. It is sectional drawing at the time of providing a plurality of seawater introduction means same as the above. It is a perspective view explaining the process of packing the aggregate mud which shows Example 3 of this invention in a bag. It is sectional drawing which shows the reference example 1 of this invention. It is sectional drawing of a box as same as the above. It is sectional drawing which shows the reference example 2 of this invention. It is sectional drawing of a box as same as the above. It is sectional drawing of the box which shows Example 4 of this invention. It is sectional drawing of the box which shows Example 5 of this invention.

  Preferred embodiments of the present invention will be described with reference to the accompanying drawings. The embodiments described below do not limit the contents of the present invention described in the claims. In addition, all of the configurations described below are not necessarily essential requirements of the present invention.

  1 to 12 show a first embodiment. As shown in the figure, in the present processing method (storage system), mud D containing radioactive material having a volume on the bottom S such as a pond, lake, river or sea is collected and processed. As the collection means used for the collection, the dredging means 1 is used.

  The dredging means 1 is provided on a carrier ship 2 as a hull. Further, after removing foreign substances from the dredged mud, a pumping means 4 for pumping to the processing place 3 is provided on the carriage 2. A pipe line 5 which is a closed pipe line is connected to the pumping means 4, and a plurality of floats 6 are provided on the water line 5 in the pipe line 5, and the pipe line 5 is disposed near or on the water surface by the floats 6. On the other hand, the land portion of the pipeline 5 is supported by a plurality of support bases 7. In the following description, a pond is taken as an example of the collection site 8. Preferably, the collection place and the storage place are the same.

  The processing place 3 is provided in the vicinity of the sampling place 8, and is provided with a processing device 11 that classifies mud into coarse and fine particles, lowers the water content, and aggregates the fine particles.

  As shown in FIGS. 6 and 8, a decompression cyclone 12 serving as decompression means is provided at the end of the pipe 5. This decompression cyclone 12 has a cylindrical portion 12A having a diameter larger than that of the pipe 5 and connects the pipe end of the pipe 5 by shifting the center line of the pipe 5 with respect to the diameter direction of the cylinder 12A. doing. Then, the mud D that has passed through the decompression cyclone 12 is sent to the sediment dewatering sieve 9. The diameter of the cylindrical portion 12A is at least twice as large as the diameter of the conduit 5, and preferably at least three times.

  Therefore, the mud D discharged laterally from the end of the pipeline 5 is supplied to the sediment dewatering sieve 9 after being reduced in pressure by falling as a swirling flow along the inner surface of the cylindrical portion 12A. . By using a swirl flow in this way, the flow velocity is reduced and mud is less likely to scatter around as compared to the case of supplying directly from the pipeline 5.

  Furthermore, the processing apparatus 11 includes the sediment dewatering sieve 9 as a separating means, a sediment washing water tank 10 as a cleaning means, a plurality of sedimentation tanks, a chemical feeding device for injecting a flocculant into the mud, a sedimentary mud sediment and clean water. It includes a mud storage tank that separates and a dewatering means for dewatering the agglomerated mud. In this example, the processing apparatus 11 includes, in the order of transfer of the mud D, the sediment dewatering sieve 9, the sediment washing water tank 10, the mud storage tank 13, the sedimentation tank 14, the chemical charging machine 15, the stirring reaction tank 23, the first to third. Sedimentation tanks 16, 17, 18, mud storage tank 19, and dewatering means 20 are arranged.

  In this embodiment, the treatment of dredged mud will be described. As shown in FIG. 12, a soil-treated material containing radioactive material stored on the ground is sent to the mud storage tank 13 of the treatment device 11. The processing may be performed as follows. In this case, if the soil-treated material contains large impurities or foreign materials, after separating the foreign materials and foreign materials, send them to the mud tank 13, and if the soil-treated material has a low moisture content, Before being sent to the mud storage tank 13 or to the mud storage tank 13, water can be added for treatment.

  The earth-and-sand dewatering sieve 9 includes a rotary sieve or the like, and the mud D sent from the decompression cyclone 12 is a mud containing a large particle size of gravel and sand (coarse particles), a fine particle and water, Then, gravel and sand having a large particle diameter are sent from the discharge port 9A of the earth and sand dewatering sieve 9 to the earth and sand washing water tank 10 in a dehydrated state. On the other hand, the mud containing fine particles and water is sent to the mud storage tank 13 through the conduit 9B.

  In the earth and sand washing tank 10, water is supplied to the coarse particles for washing, and after washing, that is, the coarse particles whose radioactivity concentration is below the reference value are temporarily placed outside the earth and sand washing tank 10. . In addition, after removing gravel and the like from the coarse particles in the earth and sand dewatering sieve 9, it may be sent to the earth and sand washing water tank 10 and the obtained washing sand may be temporarily placed, or after the earth and sand washing water tank 10 has been subjected to washing treatment. The washed sand may be obtained by separating the coarse particles of gravel and sand. Then, the washing water used in the earth and sand washing water tank 10 is sent to the mud storage tank 13 through the pipe line 10A. The washing water sent to the mud storage tank 13 contains fine particles. As a result, the total amount of earth and sand containing radioactive substances can be greatly reduced.

  In this way, mud soil is transported to the mud storage tank 13 by adding the water sent to the mud storage tank 13 through the pipe 10A to the fine particles and water screened by the sediment dewatering sieve 9. In the mud storage tank 13 to which the mud has been transported in this way, the mud is allowed to stand, and if necessary, a flocculant is added and then left to stand. By standing in this manner, the fine particles contained in the mud settle to the lower part of the mud tank 13, and the upper mud in the mud tank 13 (referred to as separated water) is then passed through the pipe 13A. It is sent to the settling tank 14 and allowed to stand. This mud contains moisture. The reason why the separated and separated fine water is separated into the separated fine water is that radioactive substances such as cesium are contained in the fine particles more than the coarse particles. Further, a flocculant is added to fix cesium in the fine particles. The fine particles settled in the mud storage tank 13 are sent to the dewatering means 20 through the pipe 25. As the flocculant, a zeolite-based one can be used. Further, the fine-grained portion is a small silty / clayy material having a coarse particle separated from the mud D or sand (fine sand) having a particle size smaller than a predetermined particle size.

  The mud sent from the mud storage tank 13 to the settling tank 14 is allowed to stand, and is precipitated and separated into the lower fine particles and separated water. Here too, the fine particles settled in the settling tank 14 are sent to the dehydrating means 20 through the pipe line 25, while the separated clean water from the settling tank 14 is sent to the next chemical feeding machine 15 through the pipe line 14A, and the chemical is put in. After adding the flocculant by the machine 15, the separated clean water mixed with the flocculant is sent to the stirring reaction tank 23 through the line 15A, and is agglomerated by stirring. Thereafter, the agglomerated mud in the stirring reaction tank 23 is transferred to the first settling tank 16 and allowed to stand. In the first sedimentation tank 16, after separating and separating into the lower fine particles and separated water, the aggregated mud soil in which the lower fine particles are aggregated is sent to the dewatering means 20 through the aggregated mud transport pipe 21 and separated. The clean water is transferred to the second settling tank 17 through the pipe line 16A and allowed to stand. In this second settling tank 17, after settling and separating into lower fine particles and separated clean water by standing, the lower agglomerated mud is sent to the dewatering means 20 through the agglomerated mud transport pipe 21 and separated. The water is transferred to the third settling tank 18 through the pipe line 17A and allowed to stand. Similarly, in the third settling tank 18, after settled and separated into the lower fine particles and separated clean water by standing, the lower aggregated mud is sent to the dewatering means 20 through the aggregated mud transport pipe 21. The separated clean water is transferred to the mud storage tank 19 through the pipe 18A and allowed to stand. In the mud storage tank 19, after settled and separated into the lower fine particles and the separated water by standing, the lower agglomerated mud is sent to the dewatering means 20 through the agglomerated mud transport pipe 21, and the separated water is supernatant. Water is drained by a water return pipe 22, and in this example, it is drained into a pond.

  In this way, in the first to third settling tanks 16, 17, 18 and the like, the agglomerated mud and the separated water are settled and separated, so that the agglomerated mud contained in the separated water is separated. The contained mud D can be greatly reduced in volume compared to the initial amount.

  In addition, even if the processing from the sedimentation tank 14 to the mud tank 19 is performed once, the separation of the agglomerated fine particles (agglomerated mud soil) is insufficient, that is, a predetermined amount in the separated water of the mud tank 19 If the above mud (fine-grained portion) remains, return the separated clean water containing the mud from the storage tank 19 to the storage tank 13 or the sedimentation tank 14 using a mud return line (not shown). The treatment from the mud storage tank 13 or the sedimentation tank 14 to the mud storage tank 19 can be repeated one or more times.

  In addition, when separated clean water having a radioactivity concentration of a predetermined value or less is obtained in the course of treatment, it can be returned to a pond using the supernatant water return pipe 22, thereby reducing the water content of the mud. . The supernatant water return pipe 22 is connected to the mud storage tank 13, the sedimentation tank 14, the third sedimentation tank 18, the mud tank 19 and the dewatering means 20 through the branch pipe 22A. When the radioactivity concentration falls below a predetermined level, it can be returned to the pond because it is the collection site 8.

  In this way, the separated clean water is drained to increase the water content, and the mud (flocculated mud containing radioactive material) aggregated by the coagulant is packed in the bag 24 before being dehydrated by the dehydrating means 20. The bag 24 is made of polyethylene or polyvinyl chloride having water permeability, weather resistance, and flexibility. For example, for the bag 24, a stretchable tape (yarn) made of a resin such as polyethylene or polypyropylene is used, and the stretched tape is woven with a loom so that it has water permeability (resin cloth bag). .

  In this way, the separated clean water is drained to reduce the water content, and the mud of the storage tank 19 (agglomerated mud containing radioactive material) that has been aggregated by the coagulant is packed in the bag 24. The bag 24 is made of polyethylene or polyvinyl chloride and has water permeability and weather resistance. For example, for the bag 24, a stretchable tape (yarn) made of a resin such as polyethylene or polypyropylene is used, and the stretched tape is woven with a loom so that it has water permeability (resin cloth bag). . In this example, the agglomerated mud containing the radioactive substance is a treated product containing the radioactive substance.

  FIG. 9 is a schematic explanatory view of the dewatering means 20. A plurality of drain holes 27 are formed in a container body 26 having an upper opening, and a bag 24 filled with agglomerated mud is placed in the container body 26. A compression plate 28 is disposed above, and the agglomerated mud is dehydrated by compressing the bag 24 with the compression plate 28 and the container body 26. During dehydration, water is collected in a dehydration container (not shown) through the bag 24 and the drain hole 27. Further, as described above, the water generated by the dewatering means 20 can be returned to the reservoir by the supernatant water return pipe 22.

  If the dehydrating means 20 is not used, the bags 24 are placed on a flat surface or the like and stacked in multiple stages, so that the water from the lower bag 24 is drained through the bags 24 due to the load from the upper bag 24 and dehydrated. An effect can be obtained. In this case, a predetermined time is required until the bag 24 is temporarily placed and dehydrated, whereas when the dehydrating means 20 is used, the time necessary for dehydration is shortened.

  In this example, a box 31 is used as a container for storing the agglomerated mud. As shown in FIG. 10 and the like, the box body 31 includes a bottom wall portion 32 and four side wall portions 33, 33, 33, 33, and includes a lid body 35 that closes the upper opening 34, and is made of concrete. It is. The box 31 is preferably made of concrete in the entire thickness direction of the walls 32 and 33 and the lid 35, but may be provided with a concrete layer on a part of the thickness. Then, with the lid 35 closed, the entire periphery is surrounded by a concrete layer. The box 31 may be cylindrical. In addition, a plurality of connecting portions 36 for suspension tools (not shown) are provided on the upper portions of the side wall portions 33, 33 of the box body 31, and by connecting suspension devices such as ropes to the connection portions 36, the box The body 31 can be suspended, and the connecting portion 36 constitutes a suspension means.

  Then, a plurality of dehydrated bags 24 are packed in a box 31 and the lid 35 is closed with the inside being almost full. In this case, the lid 35 and the upper opening 34 may be sealed, but the lid 35 may only be closed.If the lid 35 is only closed, the lid 35 and the upper opening 34 may be closed inside the box 31 when submerged in water. Although water invades, the agglomerated mud does not leak from the bag 24.

  The box 31 filled with the bags 24 is lowered to the bottom S of the pond for the collection site 8 and stored in a state of being submerged in water. In this case, the box 31 is placed at the place where the dredging of the bottom S is completed. In addition, a place where the box 31 is submerged throughout the year is selected.

  Next, a method for treating a radioactive substance stored in a box 31 that is an intermediately stored treatment will be described. The following processing may be performed without intermediate storage of the box 31 in water.

  A lifting tool (not shown) is connected to the connecting portion 36 of the underwater box 31, the box 31 is lifted by a hoist (not shown), and placed on the platform 52 of the self-propelled transport vehicle 51. In this case, since the box 31 is a cube or a rectangular parallelepiped, it can be efficiently mounted on the loading platform 52. Then, the box body 31 is fixed to the loading platform 52 and transported to the mooring place of the carriage 53 by the transport vehicle 51. In addition, when dredging is performed in the river, it is transported to the place where the river carrier 53 is moored.

  Further, as shown in FIG. 12, after the condensed mud is packed in the box 31, it may be placed on the carrier 52 of the transport vehicle 51 and mounted on the carriage 53 without being stored in water.

  A plurality of boxes 31 are transported to a port by a transport vehicle 51, and the plurality of boxes 31 are mounted inside a sea trolley 53. The box body 31 is mounted in a plurality of stages, and the box body 31 is fixed to the carriage 53 by a fixing means (not shown) such as a rope as necessary. As will be described later, the lid 35 is fixed to the upper opening 34 before sinking the carriage 53. In this case, it is not necessary to seal the upper opening 34 with the lid 35. When the box 31 has a thickness that can withstand the water pressure at the seabed, the upper opening 34 may be sealed.

  As shown in FIGS. 1 and 2, the trolley 53 has a float structure surrounded by an upper plate portion 54, a bottom plate portion 55, and a peripheral side plate portion 56, and the inside is reinforced by a reinforcing girder 57. It is made of concrete and has reinforcing bars. Further, a seawater inlet 61 is provided in the center of the bottom plate portion 55, and a valve body 62 that is an electric on-off valve is provided at the seawater inlet 61. The valve element 62 can be an electric type. The seawater inlet 61 and the valve body 62 constitute seawater introduction means 60. Further, an opening / closing operation part 63 for opening and closing the valve body 62 is provided. The opening / closing operation part 63 is provided outside the carriage 53, and in this example, is provided above the upper plate part 54. A plurality of width direction rib portions 55W and length direction rib portions 55L of the base boat 53 are formed on the upper portion of the bottom plate portion 55, and a floor slab portion 58 is laid on the rib portions 55W and 55L. . The upper plate 54 is provided with an opening 59, and a lid 59A for opening and closing the opening 59 is provided.

  The opening / closing operation unit 63 is electrically connected to the valve body 62, and includes a transmission / reception unit 64, a control unit 65, and a power source (not shown) such as a battery, and is operated remotely. The control means 66 includes a transmission / reception means 67, an operation unit 68, and a power source (not shown) such as a battery. Then, the operation unit 68 of the control unit 66 is operated, and a signal related to the opening degree of the valve body 62 is sent from the transmission / reception unit 67 to the opening / closing operation unit 63, which is received by the transmission / reception unit 64. A signal related to the opening degree is output to the valve body 62, and the valve body 62 is opened. Note that the opening / closing operation unit 63 may be configured to manually open / close the valve body 62.

  When the box body 31 is carried into the carriage 53, the opening 59 is opened, and the box 31 is suspended from the opening 59 into the carriage 53 by a hoist or the like. A transport means such as a hawk lift is provided in the carriage 53. The transport means transports the box 31 to a predetermined position of the carriage 53, and arranges the box 31 in the width direction and the length direction of the carriage 53. Further, they are stacked in a plurality of stages (two stages in FIG. 2). Thereafter, the opening 59 is closed by the lid 59A.

  In this way, the trolley 53 having a plurality of box bodies 31 mounted therein is towed to the set place by the tug 71. An example of the location of the sink is the Japan Trench. After towing, the carriage 53 is disconnected from the tug 71 and the valve 62 is opened by operating the control means 66. In this case, an operator who is away from the carriage 53 and placed on the tug 71 operates the control means 66.

  Then, seawater is introduced into the inside of the carriage 53 from the seawater introduction port 61, and the carriage 53 sinks into the sea. In this case, the upper plate portion 54 is preferably provided with an exhaust port (not shown). In this way, a plurality of boxes 31 can be sunk at the bottom of the sea together with the carriage 53 and stored on the seabed for a long time. In this case, since the bag 24 packed with the coagulated sludge is stored in the box 31, the bag 24 does not come out of the box 31 until it reaches the seabed, and can be sunk on the seabed together with the carriage 53. In addition, what is necessary is just to set the thickness of concrete to the thickness which can endure water pressure, when sinking in the state which sealed the box 31. FIG. Since it can be stored on the seabed for a long time in such a submerged state, it can be expected to be recovered on the ground and used as a renewable energy resource in the future when the treatment method is established.

Thus, in this embodiment, corresponding to claim 1, the mud of the bottom S containing the radioactive substance is collected by the dredger, and the collected mud is transported to the treatment place 3, where the radioactive substance is removed at the treatment place 3. After removing the coarse particles from the mud containing, agglomerating the mud soil from which the coarse particles have been removed , storing the agglomerated mud in the container 31 that is a container, and storing the box 31 in the water from which the mud was collected, equipped with a box 31 in Theissen 53, the barge 53, the opening and closing valve serving valve body 62 for opening and closing the seawater inlet 61 and the seawater inlet port 61 for introducing the seawater therein is provided, the barge 53 After moving to the sea treatment place, the control means 66 is operated from a place away from the trolley 53 to open the valve body 62 and introduce seawater into the dairy ship 53 from the seawater inlet 61, thereby Since a plurality of boxes 31 are submerged in the sea together with the trolley 53, the processed material is stored. A large number of boxes 31 can be efficiently sunk on the seabed.

Further, in the present embodiment in this manner, corresponding to claim 1, internal seawater is introduced into the by opening the valve body 62, by barge 53 sinks, it can be easily performed work.

In this way, in this embodiment, corresponding to claim 2 , since the box 31 as a container has a concrete layer, the concrete layer can ensure strength against water pressure.

In this way, in this embodiment, in correspondence with claim 1 , by storing the box 31 in the water from which the mud was collected, there is no need to select another intermediate storage place, and mud containing radioactive material. By agglomerating D, storing it in a box 31 and storing it underwater, mud D containing radioactive material does not diffuse into water during intermediate storage, and radiation shielding effect by water is obtained, affecting the surroundings. An intermediate storage place with less is obtained. Thus, final disposal can be performed by sinking the box body 31 stored in the intermediate storage place together with the carriage 53 into the sea.

In this way, in this embodiment, corresponding to claim 1 , the control means 66 is operated to open the valve body 62, which is an on- off valve, so that the valve body 62 can be opened and closed from a remote location. it can.

Furthermore, as an effect on the real 施例, since fixed by stacking box 31 on top of barge 53, it is possible to process a large number of the box 31 efficiently. In addition, a seawater inlet 61 is provided in the center of the bottom plate 55, and a valve body 62 that is an electric on-off valve is provided in the seawater inlet 61. When the valve body 62 is opened, seawater is introduced from the center of the carriage 53. Then, the carriage 53 can be sunk in a horizontal state. In particular, by storing agglomerated mud clay, which is a processed material containing a radioactive substance, in a box 31 and mounting a plurality of boxes 31 in a pedestal 53, it can be stored for a long time on the seabed in a submerged state.

  Further, in the intermediate storage method of the present embodiment, a collecting step for collecting the mud containing the radioactive substance, a conveying step for pumping the collected mud to the processing place 3 through the pipeline 5, and the collected mud are separated into fine particles and coarse particles. A classification process for classifying into granular fractions, an aggregating process for separating coarse grains by sedimentation, adding a flocculant to the mud and agglomerating fine mud particles, and a bagging process for filling the aggregated mud into the bag 24 A dehydration step for dewatering the agglomerated mud, a dehydrating bag-packed agglomerated mud soil in a box 31 as a container, and a transporting step for transferring the box 31 to the water of the collection site 8; And a storage process for storing 31. The apparatus used for these is not limited to an Example, Various apparatuses can be used.

  Thus, since the mud soil subjected to the coagulation / dehydration process is returned to the box 31 to the place where the mud D containing the radioactive material is collected by the dredging, there are the following advantages.

  First, there is no need to look for another storage location. Further, even if the bottom mud is stirred by rain or water inflow, the mud containing the radioactive material is already removed and stored in the box 31, so that the radioactive material is not stirred. Furthermore, since it is put in the box 31 having a concrete layer and stored in water, radioactive diffusion can be prevented by the concrete and water. Moreover, if the water level does not become lower than a predetermined level, the pond water can be used as agricultural water or the like. Therefore, it becomes the most suitable intermediate storage place until it is sent to the final disposal site.

  Hereinafter, as an effect on the embodiment, the mud containing the radioactive substance is collected, the collected mud is transported to the processing place 3 through the pipeline 5, the mud is aggregated in the processing place 3, and the aggregated mud is stored in the container. Since this box 31 is stored in the box 31 and stored underwater, the mud containing the radioactive material is conveyed to the processing place 3 through the pipe line 5 without being exposed to the outside air, and is aggregated at the processing place 3 to be boxed. By storing it in 31 and storing it underwater, mud containing radioactive material will not diffuse into the water, and the radiation shielding effect by water can be obtained, and a storage place with little influence on the surroundings can be obtained.

  Moreover, since a coarse particle part is removed from the mud containing a radioactive substance, and the mud which removed the coarse particle part is condensed, the component of the mud which contains many radioactive substances can be aggregated and processed.

  Moreover, since the box 31 which is a container has a concrete layer, a radiation shielding effect is obtained by the concrete layer and water, and a storage place having little influence on the surroundings is obtained.

  Moreover, since the agglomerated mud is packed in a bag 24 and a plurality of bags 24 packed with the mud are stored in a box 31 as a container, the handling of the mud becomes easy, and the bag 24 can be stored in the box 31 as it is. Storing work in the box 31 is facilitated.

  Furthermore, it is possible to collect and treat the mud in the water that collects the mud containing the emissive substance with the dredge.

  Furthermore, since the mud D of the bottom S, which is the bottom of the water, is collected with a dredge and the box 31 as a container is stored in the water from which the mud D is collected, by storing the agglomerated mud in the collected place, There is no need to select a storage location, and if it is before treatment, water may flow in and the bottom mud may diffuse and be affected by radioactivity. Can not be diffused and can be stored with its radioactivity shielded by water.

  Moreover, since sludge is packed in the bag 24 having water permeability, the mud can be dehydrated after being packed. Further, since the collection place 8 and the treatment place 3 are close to each other, it is convenient to return the supernatant water generated in the treatment apparatus 11 to the collection place 8.

  13 and 14 show a second embodiment of the present invention. The same reference numerals are given to the same portions as those of the above-described embodiments, and detailed description thereof will be omitted.

  In this example, a plurality of box bodies 31 are transported to a port by a transport vehicle 51, and a plurality of box bodies 31 are mounted on a sea carrier 53 as shown in FIG. The box body 31 may be mounted in a plurality of stages, and the box body 31 is fixed to the carriage 53 by fixing means 37 such as a rope.

14 has a substantially rectangular planar shape, and is provided with seawater inlets 61 and valve bodies 62 at the four corners of the bottom plate portion 55, so that a plurality of valve bodies 62 can be opened and closed at one location. The opening operation is possible by the unit 63. In this case, opening and closing operation unit 63 may be a similarly electric Example 1, may be one of opening and closing more valve body 62 to the manual, such as a lever.

  As described above, in this embodiment, the agglomerated mud soil, which is a processed material containing radioactive substances, is stored in the box 31, a plurality of boxes 31 are mounted on the trolley 53, and the trolley 53 is moved to the sea treatment place. After that, since the carriage 53 is submerged in the seabed, the same operations and effects as the first embodiment are achieved.

  Further, as shown in FIG. 14, by providing a plurality of valve bodies 62, seawater can be introduced evenly and the introduction time can be shortened. In the first embodiment, a plurality of valve bodies 62 may be provided as shown in FIG.

  FIG. 15 shows a third embodiment of the present invention. The same reference numerals are given to the same portions as those of the above-described embodiments, and detailed description thereof will be omitted. In this example, a bag 41 is used as a container. The bag 41 is made of a resin such as polyethylene or polyvinyl chloride, or rubber, and has a water blocking property that does not allow water to pass therethrough and a weather resistance. Normally, storage in water is more than one year. Moreover, when using in the sea etc., what has predetermined durability is used also in the environment exposed to seawater.

  Then, after dewatering the agglomerated mud, the agglomerated mud is filled inside from the opening 42 of the bag 41, and the opening 42 is sealed and sealed with a sealing means 42A in a state where air is evacuated. Since this sealed bag 41 is the collection site 8, it is submerged in the bottom S of the pond and stored underwater throughout the year.

  After storing in the water bottom S for a predetermined period, the bag 41 is lifted by a hoist or the like, the bag 41 is stored in the box 31 placed on the ground, a plurality of bags 41 are stored, and then the lid 35 Close. In this case, the box 31 may be fixed to the loading platform 52, and the bag 41 lifted from the bottom S may be directly packed into the packaging 31 on the loading platform 52.

  Thereafter, similarly to the above embodiments, the box body 31 is mounted on the carriage 53, and the plurality of boxes 31 are submerged together with the carriage 53 on the seabed.

  As described above, in this embodiment, the same operations and effects as the above-described embodiments are obtained.

In this example, since the bag 41 is directly placed on the bottom S during intermediate storage, the box 31 is not necessary, and the cost can be reduced.
[Reference Example 1]
16 to 17 show Reference Example 1 of the present invention. The same reference numerals are given to the same parts as those of the above-described embodiments, and detailed description thereof will be omitted. This example shows a method for transferring a processed material containing a radioactive substance.

  Soil treated materials 72 that are to be collected by stripping the topsoil contaminated with radioactive materials are stacked in an intermediate storage place 73 such as a plaza or a ground, and stored with a blue sheet (not shown) or the like.

  The box body 31 is transported to the intermediate storage place 73, and as shown in FIG. 17, the processed material 72 is put directly into the box body 31, water 74 is put into the upper part of the box body 31, and the upper opening 34 is covered. Closed by body 35. In addition, when a large-sized foreign substance and a foreign material are contained in the processed material 72, after separating a foreign material and a foreign material, it puts in the box 31. The lid 35 seals the upper opening 34 to such an extent that water 74 does not leak. By doing so, a layer of water 74 is formed in the upper part of the box 31 and the processed product 72 is in a wet state.

  The bags 24 and 41 may be packed with the processed material 72 and stored in the box 31. In this case, a layer of water 74 is provided in the upper part of the box 31. Alternatively, a plurality of empty boxes 31 may be placed on the transport vehicle 51, moved to the intermediate storage location 73, and the processed material 72 and water 74 may be put in a state of being placed on the loading platform 52.

  A plurality of boxes 31 are placed on the loading platform 52 of the transport vehicle 51, transported to the carriage 53, and submerged together with the carriage 53, and the sea becomes the final disposal site. Further, the box body 31 may be transported to a final disposal site other than the sea or another transfer place.

As described above, the reference example has the same operations and effects as the above-described embodiments.

As described above, in this reference example, the processed object 72 containing the radioactive substance is stored in the box 31, a liquid layer such as water 74 is formed on the upper part of the box 31, and the box 31 is transported. Since this is a method for transferring a processed material containing a radioactive material to be transported on a certain transport vehicle 51, the processed material 72 containing the radioactive material can be safely transported. That is, since the processed object 72 is put in the box 31 and the liquid layer is provided on the processed object 72, the processed object 72 is not scattered outside, and the radiation shielding effect by the liquid layer can be obtained. Furthermore, the box body 31 can be mounted on the trolley 53 as it is and processed.

In this way, in this reference example, since the box body 31 has the concrete layer, the radiation shielding effect by the concrete layer can be obtained.

In addition, as an effect on the reference example, since a plurality of empty boxes 31 are placed on the transport vehicle 51 and moved to the intermediate storage location 73, and placed on the loading platform 52, the processed material 72 and the water 74 are put therein. Efficient loading work can be performed.
[Reference Example 2]
18 to 19 show a reference example 2 of the present invention. The same reference numerals are given to the same parts as those of the above-described embodiments, and detailed description thereof will be omitted. This example shows a method for transferring a processed material containing a radioactive substance.

  When sludge 75 containing a radioactive substance is generated at a sewage treatment plant or a water purification plant, this sludge 75 is treated as a treated product. The sludge 75 is temporarily placed in a bag 76 having a capacity of about 1 ton. The bag body 76 is made of a synthetic resin, has water permeability, and has a band-shaped hanging portion 77 integrally.

  As shown in FIG. 18, a bag body 76 filled with sludge 75 is placed in the box body 31 by using a suspension part 77 by a hoist or the like. Is closed by the lid 35. Also in this case, a layer of water 74 is provided in the upper portion of the box 31. Alternatively, a plurality of empty boxes 31 may be placed on the transport vehicle 51 and moved to the place where the bag body 76 is placed, and the bag body 76 and the water 74 may be put in the state of being placed on the loading platform 52.

Then, as in Reference Example 1 , a plurality of boxes 31 are placed on the loading platform 52 of the transport vehicle 51, transported to the transport boat 53, and submerged together with the transport boat 53, and the sea becomes the final disposal site. Further, the box body 31 may be transported to a final disposal site other than the sea or another transfer place.

As described above, the reference example has the same operations and effects as the above-described embodiments.

Further, as an effect on the reference example, since a plurality of empty boxes 31 are placed on the transport vehicle 51 and moved to the storage place, and put on the loading platform 52, the bag body 76 and the water 74 are put in, so the efficiency is high. Loading work can be performed.

FIG. 20 shows a fourth embodiment of the present invention. The same reference numerals are given to the same portions as those of the above-described embodiments, and detailed description thereof will be omitted. This example shows a method for transferring a processed material containing a radioactive substance.

  As shown in the figure, spacers 81 are provided on the bottom wall portion 32 and all the side wall portions 33 of the box 31. This spacer 81 forms a space filled with water 74 between the bottom wall portion 32 and the side wall portion 33 and the bag body 76, and a contact portion 82 that contacts the bag body 76, and this contact And a mounting portion 83 for attaching the portion to the inner surfaces of the bottom wall portion 32 and the side wall portion 33. The spacer 81 provided on the bottom wall portion 32 has strength to support the placed bag body 76.

  Therefore, when the bag body 76 filled with the sludge 75 is put in the box body 31, and water 74 is put in the upper part of the box body 31 and the upper opening 34 is closed by the lid body 35, the bag body 76 is moved up and down, front and rear. , A layer of water 74 is formed on the entire left and right sides, and the entire periphery of the bag body 76 is covered with the water 74 and the concrete layer, so that a radiation shielding effect by water and concrete can be obtained during transportation.

FIG. 21 shows a fifth embodiment of the present invention. The same reference numerals are given to the same portions as those of the above-described embodiments, and detailed description thereof will be omitted.

In this example, a plurality of glass solidified bodies 85 obtained by vitrifying high-level radioactive waste are stored in the box body 31 of the fourth embodiment as processed products containing radioactive substances. In FIG. 21, the glass solid bodies 85 are arranged in a plurality of vertical and horizontal directions on the plane and are overlapped in a plurality of upper and lower stages.

  For high-level waste generated from radioactive waste reprocessing facilities, the waste stored in the high-level waste liquid tank is first vitrified and stored as a solidified product, and then the radioactive material is finally stored in the future. A management system is considered in which high-level waste is buried deep underground until geological disposal occurs until the radioactivity is attenuated to a level that does not affect the generation. In addition, effective use of resources such as reprocessing spent nuclear fuel generated from a nuclear power plant, and recovering and using uranium, plutonium, and the like from there is attempted. However, spent nuclear fuel from which uranium, plutonium, etc. have been recovered is called high-level waste and has a high level of radioactivity, so care must be taken with regard to the management of that high-level waste. Currently, for high-level waste generated from radioactive waste reprocessing facilities, waste stored in the high-level waste liquid tank is first vitrified and stored as a vitrified body 85. The body 85 can be transported and processed.

  As described above, in the embodiment, the same operations and effects as the above-described embodiments are obtained. Specifically, the vitrified body 85, which is a treated product containing a radioactive substance, can be safely transported and stored on the seabed for a long time.

In addition, this invention is not limited to the above Example, A various deformation | transformation implementation is possible within the range of the summary of invention. For example, in claims 1 and 2, the box can be made of various materials, and may be made of wood or hard synthetic resin, for example. Moreover, although the metal trolley was illustrated in the Example, it may be made of concrete or the like. Further, in the embodiment, the tow was towed by towing, but a simple propulsion means such as an outboard motor was provided on the carriage, and the propulsion means was removed when it arrived at the processing place, and then the carriage was submerged. Also good. Moreover, you may comprise a valve body with the lid | cover which plugs up seawater inlet. Furthermore, the container may be made of wood or hard synthetic resin as long as it is durable. Needless to say, the water used for underwater storage includes fresh water (fresh water) and sea water (salt water). Further, when the mud is settled and separated, the flocculant may be added and then stirred and allowed to stand. Various kinds of flocculants can be used. Furthermore, in the present invention, the radioactive material is not limited to cesium, and mud containing various radioactive materials can be treated. In addition, since the fine particles are classified from the mud and the flocculant is added to obtain the agglomerated mud, the timing for adding the flocculant to the mud can be appropriately selected. Further, a bag having substantially the same internal volume as the box may be used, and the bag may be stored in the box with the agglomerate mud packed in one bag. Moreover, although the pipeline is used for conveyance of the mud from the collection place to the treatment place, it is preferable to use the pipeline for the transfer of the mud in the treatment apparatus, but other than the pipeline may be used. Furthermore, although the shape and size of the box used for the processing method and the transfer method can be selected as appropriate, it is preferable that the size of the box be able to travel on a general road on a transport vehicle. Further, the material of the trolley is not limited to concrete, and various materials such as FRP can be used. Furthermore, the vitrified body of Example 5 is put into a box as in Reference Example 1 , and water is put into this box, or after being put into a bag as in Reference Example 2 , and then put into this box, You may put in.

1 Trapping means (collecting means)
3 Processing place 8 Collection place
31 Box (container)
41 bags (containers)
53 trolley
60 Seawater introduction means
61 Seawater inlet
62 Valve body (open / close valve)
66 Control means
85 Vitrified body (processed product)
S water bottom D mud

Claims (3)

The bottom mud containing the radioactive material is collected with a dredge, and the collected mud is transported to a treatment place, and the coarse particles are removed from the mud containing the radioactive substance at the treatment place, and the coarse particles are removed. The mud is agglomerated, the agglomerated mud is stored in a container , the container is stored in the water from which the mud is collected, and a plurality of the containers are mounted on a base boat. A seawater introduction port to be introduced and an opening / closing valve for opening and closing the seawater introduction port are provided, and after the carriage has been moved to the sea treatment place, the control means is operated from a place away from the carriage to open the opening / closing valve. The radioactive material processing method characterized by sinking the trolley into the seabed by introducing seawater into the trolley from the seawater inlet . Processing method according to claim 1 Symbol placement of radioactive materials, wherein the container has a concrete layer. The radioactive substance processing method according to claim 1 or 2, wherein the agglomerated mud is packed in a bag and the bag filled with the mud is stored in the container.

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