Radioactive waste processing container

Abstract

To provide a radioactive waste processing container which can properly process gas generated when a radioactive waste is dried.SOLUTION: A radioactive waste processing container includes: a cylindrical container body having an upper opening part and a closed lower part; a lid for closing the upper opening part of the container body; a gas entrance part for supplying drying gas into the inside of the container body; a gas exit part provided in a lid for discharging the gas in the inside of the container body to the outside; a filter provided in the gas exit part for filtering gas; and an abnormal material removal device provided in a side of the lid on the container body side for removing foreign materials from gas flowing to the filter.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a radioactive waste processing container. BACKGROUND ART

[0002] In a nuclear power plant, when core fuel disposed inside a reactor pressure vessel melts, structures inside the reactor containment vessel also melt and solidify, forming debris as radioactive waste. Therefore, it is necessary to recover radioactive waste such as debris from the reactor containment vessel and process it. As a technique for processing radioactive waste, for example, there is one described in Patent Document 1. The technique described in Patent Document 1 is to contain radioactive waste in a canister, and heat the canister with a heater disposed outside the canister, thereby drying the radioactive waste inside. PRIOR ART DOCUMENTS PATENT DOCUMENTS

[0003] PATENT DOCUMENT 1 Japanese Patent No. 6578958 SUMMARY OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION

[0004] When radioactive waste is contained in a canister and the canister is heated from the outside to dry the radioactive waste inside, gas generated by evaporation of moisture is produced by the heating. Since the generated gas is mixed with dust and the like, it is necessary to remove the dust with a filter before discharging the gas to the outside. However, if the gas contains a large amount of dust, there is a problem that the filter is clogged at an early stage.

[0005] The present disclosure is made to solve the above-described problem, and an object thereof is to provide a radioactive waste processing container that can appropriately process gas generated during a drying operation of radioactive waste. MEANS FOR SOLVING THE PROBLEMS

[0006] A radioactive waste processing container according to the present disclosure for achieving the above objectives comprises: a cylindrical container body having an opening at the top and a closed bottom; a lid that closes the opening at the top of the container body; a gas inlet capable of supplying drying gas to the inside of the container body; a gas outlet provided on the lid for discharging the gas inside the container body to the outside; a filter provided on the gas outlet for filtering the gas; and a foreign matter removal device provided on the container body side of the lid for removing foreign matter from the gas flowing toward the filter. [Effects of the Invention]

[0007] The radioactive waste treatment container described herein allows for the proper treatment of gases generated during the drying process of radioactive waste. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a schematic diagram representing a radioactive waste processing container according to the first embodiment. [Figure 2] Figure 2 is a schematic diagram representing the lid of the processing container. [Figure 3] Figure 3 is a flowchart illustrating the method for processing radioactive waste. [Figure 4] Figure 4 is a schematic diagram showing the connection of the drying device to the processing container. [Figure 5] Figure 5 is a schematic diagram showing the lid of the radioactive waste processing container in the second embodiment. [Figure 6] Figure 6 is a schematic diagram showing the lid of the radioactive waste processing container according to the third embodiment. [Figure 7] Figure 7 is a schematic diagram showing the lid of the radioactive waste processing container according to the fourth embodiment. [Figure 8] Figure 8 is a schematic diagram showing the lid of the radioactive waste processing container according to the fifth embodiment. [Figure 9] Figure 9 is a schematic diagram showing the lid of the radioactive waste processing container according to the sixth embodiment. [Figure 10] Figure 10 is a schematic diagram showing the lid of the radioactive waste processing container according to the seventh embodiment. [Figure 11] Figure 11 is a schematic diagram showing the lid of the radioactive waste processing container according to the eighth embodiment. [Figure 12] Figure 12 is a schematic diagram showing the lid of the radioactive waste processing container according to the ninth embodiment. [Modes for carrying out the invention]

[0009] Preferred embodiments of the present disclosure will be described in detail below with reference to the drawings. However, these embodiments do not limit the present disclosure, and where there are multiple embodiments, they may be combinations of these embodiments. Furthermore, the components in the embodiments include those readily conceivable by those skilled in the art, those that are substantially identical, and those that are equivalent.

[0010] [First Embodiment] <Containers for processing radioactive waste> Figure 1 is a schematic diagram representing a radioactive waste processing container according to the first embodiment.

[0011] In nuclear power plants, when the reactor core and other components inside the reactor vessel melt, molten material such as molten fuel is generated, and this solidified molten material (debris) is subject to recovery as radioactive waste. The radioactive waste processing container and method of this embodiment, for example, recovers and stores radioactive waste generated at a nuclear power plant and dries it. However, the radioactive waste is not limited to debris, but may also include spent fuel or structures generated during decommissioning.

[0012] As shown in Figure 1, the radioactive waste processing container 10 comprises an outer cylinder 11, an inner cylinder 12, a perforated plate 13, and a drying lid 14. The processing container body is composed of the outer cylinder 11 and the inner cylinder 12.

[0013] The outer cylinder 11 has a cylindrical shape, with its top open and its bottom closed. The outer cylinder 11 includes an outer cylinder main body 21, a bottom portion 22, an upper opening 23, and a flange portion 24. The outer cylinder main body 21 has a cylindrical shape, but may be a rectangular tubular shape. The bottom portion 22 has a disc shape corresponding to the shape of the outer cylinder main body 21, and is integrally provided at the lower part of the outer cylinder main body 21. The upper opening 23 is provided at the upper end of the outer cylinder main body 21, and allows communication between the inside and the outside of the outer cylinder main body 21. The flange portion 24 has a ring shape, and is integrally provided on the outer side of the upper end of the outer cylinder main body 21.

[0014] The inner cylinder 12 has a cylindrical shape, with its top and bottom open. The inner cylinder 12 includes an inner cylinder main body 31, a lower opening 32, an upper opening 33, and a flange portion 34. The inner cylinder main body 31 has a cylindrical shape, but may be a rectangular tubular shape. The lower opening 32 is provided at the lower end of the inner cylinder main body 31, and allows communication between the inside and the outside of the inner cylinder main body 31. The upper opening 33 is provided at the upper end of the inner cylinder main body 31, and allows communication between the inside and the outside of the inner cylinder main body 31. The flange portion 34 has a ring shape, and is integrally provided on the outer side of the upper end of the inner cylinder main body 31. The flange portion 34 is provided with through-holes 35 penetrating in the vertical direction. A plurality of the through-holes 35 are provided at intervals in the circumferential direction of the flange portion 34.

[0015] The perforated plate 13 has a disc shape, and is formed with a large number of holes 13a penetrating in the plate thickness direction. The perforated plate 13 is integrally provided so as to close the lower opening 32 of the inner cylinder 12. The large number of holes 13a are set according to the type and size of the radioactive waste stored inside the inner cylinder 12. That is, the large number of holes 13a are preferably sized such that the radioactive waste stored inside the inner cylinder 12 cannot pass through. The perforated plate 13 is constituted by punching metal, mesh (wire gauze), or the like.

[0016] The inner diameter of the outer cylinder 11 is larger than the outer diameter of the inner cylinder 12. The total length (axial length) of the outer cylinder 11 is longer than the total length (axial length) of the inner cylinder 12. The inner cylinder 12 is disposed inside the outer cylinder 11. In this case, the outer cylinder 11 and the inner cylinder 12 are arranged such that their centers coincide. The inner cylinder 12 is arranged such that the flange portions 24 and 34 overlap vertically, and is suspended and supported inside the outer cylinder 11 by being connected by welding or the like. Note that a plurality of connecting members may be provided between the outer cylinder 11 and the inner cylinder 12 to ensure high rigidity of both.

[0017] In the processing vessel 10, a first space portion 41 is provided between the inner peripheral surface of the outer cylinder main body 21 in the outer cylinder 11 and the outer peripheral surface of the inner cylinder main body 31 in the inner cylinder 12. The first space portion 41 has a cylindrical shape. Further, in the processing vessel 10, a second space portion 42 is provided between the upper surface of the bottom portion 22 of the outer cylinder 11 and the lower surface of the perforated plate 13 fixed to the lower opening 32 of the inner cylinder 12. The second space portion 42 has a disk shape. The first space portion 41 and the second space portion 42 communicate with each other to constitute a gas flow path 43. The first space portion 41 communicates with each through hole 35 of the flange portion 34 in the inner cylinder 12, and the second space portion 42 communicates with the inside of the inner cylinder 12 through a large number of holes 13a of the perforated plate 13.

[0018] The drying lid 14 has a disk shape. The outer diameter of the drying lid 14 is substantially the same as the outer diameter of the flange portion 34 of the inner cylinder 12. The drying lid 14 is disposed at the upper portion of the outer cylinder 11 and the upper portion of the inner cylinder 12, and is fixed to the outer cylinder 11 and the inner cylinder 12 by a plurality of bolts 15. The drying lid 14 is fixed to the upper portions of the outer cylinder 11 and the inner cylinder 12, thereby closing the upper opening 23 of the outer cylinder 11 and the upper opening 33 of the inner cylinder 12. The drying lid 14 is detachably attached to the outer cylinder 11 and the inner cylinder 12 by the plurality of bolts 15.

[0019] The drying lid 14 is provided with a first communication portion 51 and a second communication portion 52 that penetrate in the thickness direction. The first communication portion 51 is located on the outer circumference of the drying lid 14, and the second communication portion 52 is located in the center of the drying lid 14. The first communication portion 51 communicates with the upper part of the first space portion 41 that constitutes the gas flow path 43 via the through hole 35. The second communication portion 52 communicates with the inside of the inner cylinder 12. In this embodiment, multiple first communication portions 51 are provided, and one second communication portion 52 is provided, but the number of first communication portions 51 and second communication portions 52 is not limited, and for example, multiple second communication portions 52 may be provided.

[0020] The drying lid 14 has a first coupler 53 attached to its top corresponding to the first communication section, and a second coupler 54 attached to its top corresponding to the second communication section 52. The first coupler 53 and the second coupler 54 are couplers for connecting pipes. That is, although not shown in the figure, the first coupler 53 and the second coupler 54 are provided with valves inside, and the valves are biased and supported in a direction that closes the passage by the biasing force of a spring. When a plug, which will be described later, is connected to the first coupler 53 and the second coupler 54, the valves move against the biasing force of the spring and open the passage.

[0021] In this embodiment, the first communication section 51 communicates with the gas passage 43 (first space section 41) and functions as a gas inlet that supplies drying gas to the gas passage 43 from the outside. On the other hand, the second communication section 52 communicates with the inside of the inner cylinder 12 and functions as a gas outlet that discharges the gas inside the inner cylinder 12 to the outside.

[0022] The drying lid 14 is equipped with a filter 55 in the second communication section 52. The filter 55 filters and collects harmful substances such as dust contained in the gas discharged to the outside. The filter 55 is, for example, a HEPA filter. The drying lid 14 is also equipped with a pre-filter 56 that filters the gas, acting as a foreign matter removal device to remove foreign matter from the gas flowing toward the filter 55.

[0023] <Drying lid> This is a schematic diagram representing the lid of a processing container.

[0024] As shown in Figure 2, the drying lid 14 is provided with a second communication section (gas outlet section) 52 that penetrates in the thickness direction, and a filter 55 is provided in the second communication section 52. The drying lid 14 has a pre-filter 56 suspended and supported by a support member 57 on its inner surface 14a. The support member 57 is cylindrical in shape, with one end in the axial direction fixed to the inner surface 14a of the drying lid 14, and the other end in the axial direction to which the pre-filter 56 is fixed. The pre-filter 56 is made of metal, has a sheet shape, and is arranged at a distance from the inner surface 14a of the drying lid 14. However, the pre-filter 56 may also be directly fixed to the inner surface 14a of the drying lid 14. The pre-filter 56 removes foreign matter such as dust from the gas rising inside the inner cylinder 12 and supplies it to the filter 55. When a HEPA filter is applied to filter 55, it can capture dust particles with a particle size of 0.3 μm or larger. Therefore, the pre-filter 56 only needs to be capable of capturing dust particles with a larger particle size than filter 55. In other words, the pre-filter 56 captures larger particle size dust particles in advance, and filter 55 captures smaller particle size dust particles that the pre-filter 56 could not capture.

[0025] <Methods for disposing of radioactive waste> Figure 3 is a flowchart illustrating the radioactive waste processing method, and Figure 4 is a schematic diagram showing the connection status of the drying equipment to the processing container.

[0026] As shown in Figures 3 and 4, the radioactive waste processing method is a method for processing radioactive waste using the processing container 10 described above, and involves drying and storing the radioactive waste. Furthermore, in this embodiment of the radioactive waste processing method, various processing tasks are performed remotely by an operator using a manipulator (not shown).

[0027] In step S11, radioactive waste is placed in the processing container 10. In this case, the drying lid 14 is removed from the processing container 10, and the radioactive waste is placed inside the inner cylinder 12 through the open upper opening 33. In step S12, the drying lid 14 is attached to the processing container 10 and the upper opening 33 is closed, sealing the radioactive waste inside the processing container 10.

[0028] In step S13, various pipes constituting the drying apparatus are connected to the drying lid 14 of the processing container 10. Specifically, the gas supply pipe 61 has a heating device 62 at its base end and branches into multiple pipes at its tip, with plugs 63 connected to the tip of each branch pipe. The gas discharge pipe 64 has a blower 65, a plug 66 connected to its base end, and a gas treatment device 67 at its tip. The operator remotely operates the manipulator to connect the plug 63 of the gas supply pipe 61 to the first coupler 53 and the plug 66 of the gas discharge pipe 64 to the second coupler 54.

[0029] In step S14, the drying process of the radioactive waste is initiated. Specifically, the blower 65 is activated to apply negative pressure to the inside of the inner cylinder 12 through the second communication section 52 from the gas discharge pipe 64. The negative pressure inside the inner cylinder 12 acts on the gas flow path 43 through the holes 13a of the perforated plate 13, and then acts on the gas supply pipe 61 via the first communication section 51. As a result, the drying gas (heated air) heated by the heating device 62 is drawn into and supplied to the inside of the inner cylinder 12 through the gas supply pipe 61, the first communication section 51, the gas flow path 43, and the holes 13a of the perforated plate 13. The heated air rises inside the inner cylinder 12, heating the radioactive waste inside the inner cylinder 12 and drying it by evaporating the moisture adhering to or contained in the radioactive waste. Note that the drying gas is not limited to heated air; it may also be dry air with a low moisture content or an inert gas (such as nitrogen).

[0030] The air heated by the radioactive waste and the evaporated gas from the radioactive waste are then discharged from the second communication section 52 to the gas discharge pipe 64. At this time, the pre-filter 56 and filter 55 remove harmful substances contained in the air and gas. Specifically, first, the pre-filter 56 collects and removes foreign matter such as large-particle dust from the gas rising inside the inner cylinder 12. Next, the filter 55 collects and removes foreign matter such as small-particle dust that the pre-filter 56 could not collect. The gas treatment device 67 removes harmful substances that could not be removed by the filter 55.

[0031] Although not shown in the diagram, the drying lid 14 may be equipped with a backwashing device. For example, a differential pressure gauge may be provided to measure the pressure difference between the upstream and downstream pressures of the pre-filter 56. A gas supply system may also be provided to supply air or an inert gas (such as nitrogen gas) to the inside of the inner cylinder 12 from outside the drying lid 14 through the filter 55 and pre-filter 56. When the value measured by the differential pressure gauge exceeds a preset threshold, the gas supply system is activated to perform a backwashing process on the filter 55 and pre-filter 56 to clear any blockages.

[0032] In step S15, it is determined whether a predetermined processing time has elapsed since the start of the drying operation. If it is determined that the predetermined processing time has not elapsed since the start of the drying operation (No), the drying operation continues. On the other hand, if it is determined that the predetermined processing time has elapsed since the start of the drying operation (Yes), in step S16, the plug 66 of the gas discharge pipe 64 is removed from the second coupler 54, and the second coupler 54 is held in a closed state for a certain period of time. After the period of time has elapsed, in step S17, the piping is switched. The gas inspection pipe 71 has a plug 72 connected to one end and a hydrogen detector 73 connected to the other end. The operator remotely operates the manipulator to connect the plug 72 of the gas inspection pipe 71 to the second coupler 54.

[0033] In step S18, it is determined whether the hydrogen detector 73 has significantly detected hydrogen in the gas. In this case, it is determined whether the hydrogen concentration in the gas detected by the hydrogen detector 73 exceeds a predetermined value. If it is determined that the hydrogen detector 73 has detected hydrogen in the gas (Yes), the process returns to step S13 and the process from step S13 onward is repeated. That is, in step S13, the plug 72 of the gas inspection pipe 71 is removed from the second coupler 54, and the plug 66 of the gas discharge pipe 64 is connected to the second coupler 54. In step S14, the drying process of the radioactive waste is started. In step S15, if it is determined that a predetermined processing time has elapsed since the start of the drying process (Yes), the piping is switched in step S16, and in step S17, it is determined whether the hydrogen detector 73 has detected hydrogen in the gas.

[0034] In steps S16 to S18, the operation of the blower 65 is stopped, and after a predetermined processing time has elapsed, if the hydrogen detector 73 determines that no hydrogen is detected in the gas (No), then in step S19, all drying operations are terminated. That is, the gas supply pipe 61 and the gas discharge pipe 64 are removed from the drying lid 14.

[0035] [Second Embodiment] Figure 5 is a schematic diagram showing the lid of the radioactive waste processing container of the second embodiment. Components having the same function as those in the first embodiment described above are denoted by the same reference numerals, and detailed descriptions are omitted.

[0036] As shown in Figure 5, the drying lid 14 is provided with a second communication section (gas outlet section) 52 that penetrates in the thickness direction, and a filter 55 is provided in the second communication section 52. The drying lid 14 is provided with a pre-filter 101 that filters the gas, acting as a foreign matter removal device to remove foreign matter from the gas flowing toward the filter 55. The pre-filter 101 is suspended and supported on the inner surface 14a of the drying lid 14 by a support member 102. The support member 102 is cylindrical in shape, with one end in the axial direction fixed to the inner surface 14a of the drying lid 14, and the pre-filter 101 fixed to the other end in the axial direction. The pre-filter 101 has a pleated shape and is arranged with a gap between it and the inner surface 14a of the drying lid 14. However, the pre-filter 101 may also be directly fixed to the inner surface 14a of the drying lid 14.

[0037] The gas rising inside the inner cylinder 12 passes through the pre-filter 101. First, the pre-filter 101 captures and removes larger dust particles from the gas rising inside the inner cylinder 12. Next, the filter 55 captures and removes smaller dust particles that the pre-filter 101 was unable to capture.

[0038] [Third Embodiment] Figure 6 is a schematic diagram showing the lid of the radioactive waste processing container according to the third embodiment. Components having the same function as those in the first embodiment described above are denoted by the same reference numerals, and detailed descriptions are omitted.

[0039] As shown in Figure 6, the drying lid 14 is provided with a second communication section (gas outlet section) 52 that penetrates in the thickness direction, and a filter 55 is provided in the second communication section 52. The drying lid 14 is provided with a pre-filter 103 that filters the gas, acting as a foreign matter removal device to remove foreign matter from the gas flowing toward the filter 55. The pre-filter 103 is suspended and supported on the inner surface 14a of the drying lid 14 by a support member 104. The support member 104 is cylindrical in shape, with one end in the axial direction fixed to the inner surface 14a of the drying lid 14, and the pre-filter 103 fixed to the other end in the axial direction. The pre-filter 103 is a bag-shaped bag filter and is arranged at a distance from the inner surface 14a of the drying lid 14. However, the pre-filter 103 may also be directly fixed to the inner surface 14a of the drying lid 14.

[0040] The gas rising inside the inner cylinder 12 passes through the pre-filter 103. First, the pre-filter 103 captures and removes larger dust particles from the gas rising inside the inner cylinder 12. Next, the filter 55 captures and removes smaller dust particles that the pre-filter 101 could not capture.

[0041] [Fourth Embodiment] Figure 7 is a schematic diagram showing the lid of the radioactive waste processing container according to the fourth embodiment. Components having the same function as those in the first embodiment described above are denoted by the same reference numerals, and detailed descriptions are omitted.

[0042] As shown in Figure 7, the drying lid 14 is provided with a second communication section (gas outlet section) 52 that penetrates in the thickness direction, and a filter 55 is provided in the second communication section 52. The drying lid 14 is provided with an impact plate (impact member) 105 as a foreign matter removal device to remove foreign matter from the gas flowing toward the filter 55. The impact plate 105 is suspended and supported on the inner surface 14a of the drying lid 14 by a plurality of support members 106. The support members 106 are rod-shaped, with one end in the axial direction fixed to the inner surface 14a of the drying lid 14, and the impact plate 105 fixed to the other end in the axial direction. The impact plate 105 is a flat plate shape parallel to the inner surface 14a of the drying lid 14 and is positioned with a gap between it and the inner surface 14a.

[0043] As the gas rises inside the inner cylinder 12, it collides with the lower surface of the impact plate 105, causing larger particles of dust and other foreign matter contained in the gas to fall and be removed. The gas that collides with the lower surface of the impact plate 105 flows around the impact plate 105 to the filter 55. The filter 55 collects and removes any smaller particles of dust that could not be removed by the impact with the impact plate 105.

[0044] [Fifth Embodiment] Figure 8 is a schematic diagram showing the lid of the radioactive waste processing container according to the fifth embodiment. Components having the same function as those in the first embodiment described above are denoted by the same reference numerals, and detailed descriptions are omitted.

[0045] As shown in Figure 8, the drying lid 14 is provided with a second communication section (gas outlet section) 52 that penetrates in the thickness direction, and a filter 55 is provided in the second communication section 52. The drying lid 14 is provided with a pre-filter 56 that removes foreign matter from the gas flowing toward the filter 55. The pre-filter 56 is suspended and supported on the inner surface 14a of the drying lid 14 by a support member 57. The drying lid 14 is provided with an impact plate 105 that removes foreign matter from the gas flowing toward the filter 55. The impact plate 105 is suspended and supported on the support member 57 by a plurality of support members 106.

[0046] As the gas rises inside the inner cylinder 12, it collides with the lower surface of the impact plate 105, causing larger particles of dust and other foreign matter contained in the gas to fall and be removed. The gas that collides with the lower surface of the impact plate 105 flows around the impact plate 105 to the pre-filter 56. The pre-filter 56 removes larger particles of dust and other foreign matter from the gas. The filter 55 collects smaller particles of dust that could not be collected by the impact plate 105 or the pre-filter 56.

[0047] [Sixth Embodiment] Figure 9 is a schematic diagram showing the lid of the radioactive waste processing container according to the sixth embodiment. Components having the same function as those in the first embodiment described above are denoted by the same reference numerals, and detailed descriptions are omitted.

[0048] As shown in Figure 9, the drying lid 14 is provided with a second communication section (gas outlet section) 52 that penetrates in the thickness direction, and a filter 55 is provided in the second communication section 52. The drying lid 14 is provided with an impact plate (impact member) 105 as a foreign matter removal device to remove foreign matter from the gas flowing toward the filter 55. The impact plate 105 is suspended and supported on the inner surface 14a of the drying lid 14 by a plurality of support members 106. A bent flow path 107 is provided in the space between the drying lid 14 and the impact plate 105. That is, a plurality of guide members 108, 109 are fixed to the opposing surfaces of the drying lid 14 and the impact plate 105 at horizontal intervals. The bent flow path 107 has a shape that is alternately bent up and down in the vertical direction relative to the horizontal direction by the plurality of guide members 108, 109. The bent flow path 107 communicates the inside of the inner cylinder 12 with the filter 55.

[0049] As the gas rises inside the inner cylinder 12, it collides with the impact plate 105, causing larger particles and other foreign matter contained in the gas to fall and be removed. The gas that collides with the impact plate 105 then flows around the impact plate 105 and reaches the bent flow path 107. As the gas flows through the bent flow path 107, it collides with multiple guide members 108 and 109, causing larger particles and other foreign matter contained in the gas to fall and be removed. The filter 55 collects smaller particles that could not be removed by the impact plate 105 or the bent flow path 107.

[0050] [Seventh Embodiment] Figure 10 is a schematic diagram showing the lid of the radioactive waste processing container according to the seventh embodiment. Components having the same function as those in the first embodiment described above are denoted by the same reference numerals, and detailed descriptions are omitted.

[0051] As shown in Figure 10, the drying lid 14 is provided with a second communication section (gas outlet section) 52 that penetrates in the thickness direction, and a filter 55 is provided in the second communication section 52. The drying lid 14 is provided with an impact plate 111 and a bent flow path 112 as a foreign matter removal device to remove foreign matter from the gas flowing toward the filter 55. Multiple impact plates 111 are suspended and supported on the inner surface 14a of the drying lid 14. Multiple impact plates 111 have a corrugated shape. The bent flow path 112 is formed between the multiple impact plates 111. The bent flow path 112 connects the inside of the inner cylinder 12 and the filter 55.

[0052] As the gas rising inside the inner cylinder 12 flows through the bent passage 112, it collides with multiple impact plates 111, causing larger particles of dust and other foreign matter contained in the gas to fall and be removed. The filter 55 collects smaller particles of dust that could not be removed by the impact plates 111 or the bent passage 112.

[0053] [Eighth Embodiment] Figure 11 is a schematic diagram showing the lid of the radioactive waste processing container according to the eighth embodiment. Components having the same function as those in the first embodiment described above are denoted by the same reference numerals, and detailed descriptions are omitted.

[0054] As shown in Figure 11, the drying lid 14 is provided with a second communication section (gas outlet section) 52 that penetrates in the thickness direction, and a filter 55 is provided in the second communication section 52. The drying lid 14 is provided with a plurality of impact members 113 as a foreign matter removal device to remove foreign matter from the gas flowing toward the filter 55. The impact members 113 are suspended and supported on the inner surface 14a of the drying lid 14 by a plurality of support members 114. The plurality of impact members 113 are pipe-shaped and arranged along the horizontal direction.

[0055] As the gas rises inside the inner cylinder 12, it collides with multiple impact members 113, causing larger particles of dust and other foreign matter contained in the gas to fall and be removed. The filter 55 collects smaller particles of dust that could not be removed by the impact plate 105.

[0056] [Ninth Embodiment] Figure 12 is a schematic diagram showing the lid of the radioactive waste processing container according to the ninth embodiment. Components having the same function as those in the first embodiment described above are denoted by the same reference numerals, and detailed descriptions are omitted.

[0057] As shown in Figure 12, the drying lid 14 is provided with a second communication section (gas outlet section) 52 that penetrates in the thickness direction, and a filter 55 is provided in the second communication section 52. The drying lid 14 is provided with a cyclone 121 as a foreign matter removal device to remove foreign matter from the gas flowing toward the filter 55. The drying lid 14 has the cyclone 121 suspended and supported on the inner surface 14a. The cyclone 121 has a main body section 122 that widens in diameter on the upper side in the vertical direction, a storage section 123 connected to the lower part of the main body section 122, and a discharge section 124 connected to the upper part of the main body section 122. The main body section 122 has an inlet section 125 formed at the top, and the discharge section 124 communicates with the filter 55.

[0058] The gas rising inside the inner cylinder 12 enters the main body 122 through the inlet 125 at the upper outer circumference and flows in a vortex due to the gas velocity. At this time, foreign matter such as large-particle dust contained in the gas is centrifuged and collides with the inner wall surface of the main body 122, falls due to gravity and is stored in the storage section 123. Meanwhile, the gas flows from the center of the main body 122 to the upper discharge section 124. The filter 55 collects small-particle dust that could not be removed by the cyclone 121.

[0059] [Effects of this embodiment] The radioactive waste processing container according to the first embodiment comprises a cylindrical container body (outer cylinder 11 and inner cylinder 12) having upper openings 23, 33 and closed at the bottom, a drying lid 14 that closes the upper openings 23, 33 of the container body, a first communication section (gas inlet section) 51 that can supply drying gas to the inside of the container body, a second communication section (gas outlet section) 52 provided on the drying lid 14 to discharge the gas inside the container body to the outside, a filter 55 provided on the second communication section 52 to filter the gas, and a foreign matter removal device provided on the container body side of the drying lid 14 to remove foreign matter from the gas flowing toward the filter 55.

[0060] According to the first embodiment of the radioactive waste processing container, the radioactive waste contained in the container body is dried by a drying gas supplied to the container body from the first communication section (gas inlet section) 51, and the drying gas and the vapor generated by the drying of the radioactive waste rise inside the container body. As the gas rises inside the container body, foreign matter such as large-particle dust is removed by the foreign matter removal device, and small-particle dust is removed by the filter 55. As a result, clogging of the filter 55 is suppressed, and the gas generated during the drying process of radioactive waste can be properly processed.

[0061] The radioactive waste processing container according to the second embodiment is the same as the radioactive waste processing container according to the first embodiment, and furthermore, the foreign matter removal device is suspended and supported from the drying lid 14. This allows the foreign matter removal device to be properly attached to the drying lid 14.

[0062] The radioactive waste treatment container according to the third embodiment is a radioactive waste treatment container according to the first or second embodiment, and further, the foreign matter removal device has pre-filters 56, 101, and 103 for filtering gas. This allows for simplification of the structure.

[0063] The radioactive waste processing container according to the fourth embodiment is a radioactive waste processing container according to any one of the first to third embodiments, and further, the foreign matter removal device has impact plates (impact members) 105, 111 and impact member 113 upon which the gas collides. This makes it possible to reduce manufacturing costs.

[0064] The radioactive waste treatment container according to the fifth embodiment is a radioactive waste treatment container according to any one of the first to fourth embodiments, and further, the foreign matter removal device has bent channels 107, 112 through which the gas flows. This makes it possible to appropriately remove foreign matter with large particle sizes from the gas.

[0065] The radioactive waste treatment container according to the sixth embodiment is a radioactive waste treatment container according to any one of the first to fifth embodiments, and further comprises a cyclone 121 as a foreign matter removal device. This makes it possible to appropriately remove foreign matter with large particle sizes from the gas.

[0066] The radioactive waste processing container according to the seventh embodiment is a radioactive waste processing container according to any one of the first to fifth embodiments, further comprising: an outer cylinder 11 having an upper opening 23 and a closed lower end; an inner cylinder 12 having an upper opening 33 and a lower opening 32 and a cylindrical shape, and positioned inside the outer cylinder 11 to form a gas flow path 43 between itself and the outer cylinder 11; and a perforated plate 13 provided at the lower opening 32 of the inner cylinder 12, which connects the inside of the inner cylinder 12 with the gas flow path 43. This allows drying gas to be appropriately supplied to the inside of the inner cylinder 12 with the gas flow path 43, thereby improving the efficiency of the radioactive waste drying process. [Explanation of symbols]

[0067] 10. Containers for processing radioactive waste 11. Outer cylinder (container body) 12. Inner cylinder (container body) 13 Perforated plate 14 Drying lid 15 volts 21 Outer cylinder body 22 Bottom 23 Upper opening 24 Flange section 31 Inner cylinder body 32 Lower opening 33 Upper opening 34 Flange section 35 Through hole 41 1st space part 42 Second space 43 Gas flow path 51. First connecting section (gas inlet section) 52 Second connecting section (gas outlet section) 53. First coupler (socket) 54. Second coupler (socket) 55 Filters 56,101,103 Pre-filter 57,102,104 Support members 61 Gas supply piping 62 Heating device 63 plugs 64 Gas discharge piping 65 Blower 66 plugs 67 Gas treatment equipment 71. Piping for gas inspection 72 plugs 73 Hydrogen detector 105 Impact plate (impact component) 106 Support member 107 Curved channel 108,109 Guide members 111 Impact plate (impact component) 112 Curved channel 113 Impact Member 114 Support Member 121 Cyclone

Claims

1. A container body having an opening at the top and a closed bottom, forming a cylindrical shape, A lid that closes the upper opening of the container body, The container body has a gas inlet that can supply drying gas, The lid is provided with a gas outlet for discharging gas from inside the container body to the outside, A filter provided at the gas outlet for filtering the gas, A foreign matter removal device provided on the container body side of the lid to remove foreign matter from the gas flowing toward the filter, Equipped with, The foreign matter removal device has a pre-filter for filtering gas. A container for processing radioactive waste.

2. A container body having an opening at the top and a closed bottom, forming a cylindrical shape, A lid that closes the upper opening of the container body, The container body has a gas inlet that can supply drying gas, The lid is provided with a gas outlet for discharging gas from inside the container body to the outside, A filter provided at the gas outlet for filtering the gas, A foreign matter removal device provided on the container body side of the lid to remove foreign matter from the gas flowing toward the filter, Equipped with, The foreign matter removal device has a cyclone, A container for processing radioactive waste.

3. The foreign object removal device is suspended and supported from the lid. A radioactive waste treatment container according to claim 1 or claim 2.

4. The foreign matter removal device has a collision member to which gas collides. A radioactive waste treatment container according to claim 1 or claim 2.

5. The foreign matter removal device has a curved passage through which gas flows. A radioactive waste treatment container according to claim 1 or claim 2.

6. The container body comprises an outer cylinder having an upper opening and a closed lower end, an inner cylinder having an upper and lower opening and a cylindrical shape, and positioned inside the outer cylinder to form a gas passage between itself and the outer cylinder, and a perforated plate provided at the lower opening of the inner cylinder to connect the inside of the inner cylinder with the gas passage. A radioactive waste treatment container according to claim 1 or claim 2.

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