JP3865421B2 - Waste production method and apparatus after melting and volume reduction treatment of low-level radioactive waste - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention manufactures a waste by cooling and solidifying a melt discharged from a plasma heating melting furnace for melting and volume-reducing low-level radioactive miscellaneous solid waste generated from nuclear power plants and radioactive material handling facilities. It relates to a method and a device.
[0002]
[Prior art]
Conventionally, there are the following three methods for cooling and solidifying a melt melted in a melting and volume reduction treatment facility for nonflammable low-level radioactive waste.
[0003]
(1) As shown in FIG. 13, molten slag is dropped from the combustion chamber 1 to the water cooling chamber (water tank) 2 and is made into a glassy granular material (granule), extracted by a belt conveyor (not shown), and heated air After drying, load into drums. [As a prior art document, industrial machinery, No. 422 (November 1985), p. There exists "the high temperature melting furnace of radioactive waste" as described in 40-65. ]
(2) As shown in FIG. 14, a canister (crucible) 4 is placed in a high-frequency melting furnace 3, the incombustible material is melted and reduced in the canister (crucible) 4, and the canister (crucible) 4 is placed in a high-frequency melting furnace. 3 is taken out and sent to the cooling chamber 5 to cool and solidify the melt in the canister (crucible) 4, and then taken out from the cooling chamber 5 and stored together with the canister (crucible) 4 in a 200 liter drum can 6, or the canister ( Take out the solidified body 7 from the crucible 4 and store it in a 200 liter drum 6 and fill it with mortar. [Decommissioning Technical Report, No. 8 (June 1993), p. 40-65, “Development of radioactive waste treatment technology”. ]
(3) As shown in FIG. 15, the molten metal in the melting furnace 8 is cut out by a plasma torch 9 serving as a hot water and is taken out into a water-cooled mold 11 in the solidification chamber 10 to be solidified in a container or made into a water-cooled mold 12. Taken out and blocked. [As a prior art document, thermal nuclear power generation, Vol. 35, no. 6 (October 1984). There exists "the nonflammable miscellaneous solid waste processing cold test apparatus" of 34-35. ]
[0004]
However, these conventional techniques have the following problems.
(1) When cooling by directly contacting a cooling medium such as water, the water, the cooling medium, etc. are contaminated with radioactivity and the amount of secondary waste increases.
(2) When a canister (crucible) is stored in a drum can and used as waste, the canister (crucible) becomes thicker and the volume of the drum can be increased to reduce the volume of waste. Efficiency is reduced.
(3) When taking out the solidified product after cooling and solidifying in a crucible and mold, radioactive materials are removed due to breakage of easily breakable components (solidified slag glassy, etc.) and separation of heterogeneous layers (solidified slag, metal layer, etc.). Material may be scattered.
[0005]
[Problems to be solved by the invention]
Therefore, the present invention can suppress an increase in the amount of secondary waste (cooling water amount, exhaust gas amount, etc.) in the treatment process of the molten waste discharged from the melting furnace, and the solidified shape is close to the internal shape of the drum can. , Can increase the filling rate in the drum can, increase the volume reduction rate of waste, and prevent the scattering and diffusion of radioactive materials due to the discharge process of the melt to the receiver and the breakage of the solidified body In addition, the present invention is intended to provide a method and an apparatus for producing a waste body after melting and volume reduction treatment of low-level radioactive waste, which can produce a waste body suitable for remote handling.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the method for producing a waste body after melting and volume-reducing treatment of low-level radioactive waste according to the present invention is a method for melting discharged from a plasma heating melting furnace obtained by melting and volume-reducing low-level radioactive miscellaneous solid waste. The product is filled in a thin-walled steel receiver held in a holding container having a thick-walled fireproof structure in a reduced-pressure atmosphere, and air bubbles in the melt due to dissolved gas and entrained gas are released by natural cooling, The melt is separated into a metal layer and a slag layer based on the difference in specific gravity, and after solidifying the melt, the holding container is cooled in a cooling hood. After cooling, the holding container is removed and the solidified body integrated with the receiver is mounted on the drum can. It is characterized by filling and solidifying the fixing material to make a waste body and closing the lid.
[0007]
The waste body production apparatus after the low volume radioactive waste melting and volume reduction treatment of the present invention, a filling chamber provided below the outlet of the plasma heating melting furnace for melting and reducing the low level radioactive miscellaneous solid waste, A thin-walled steel receiver for receiving the melt discharged from the tap and a separable and fastened thick fire-resistant holding container for holding the receiver in the filling chamber are vertically installed on a stand. A transfer chamber comprising a lifter, a container transfer device for horizontally feeding a receptacle and a holding container for holding a melt, which is provided below the filling chamber and vertically lowered by the lifter, and the melt sent from the transfer chamber A cooling hood that cools the melt while receiving and transporting a receiving container and a holding container; a holding container opening device that separates the receiving container and the holding container that are fed from the cooling hood; and the holding container. Acceptance The horizontal crane that hangs the solidified body integrated into the drum can, the fixing material filling machine that fills the drum can with the solidified material, and the fixed material is cured while the drum filled with the fixing material is transferred. The fixed material curing conveyor that forms a waste body together with the drum can and a lid closing device that closes the drum can.
[0008]
The filling chamber in the transport and burying waste manufacturing apparatus preferably has a duct having a duct communicating with the exhaust gas treatment system of the plasma heating and melting furnace so that the partition wall at the top of the filling chamber can be expanded and contracted. In order to accelerate the release of the components, a vibrator that vibrates the receiving container and the holding container placed in the filling chamber may be provided in the lower portion of the filling chamber. Further, a drive type sliding door may be provided at the upper end of the partition wall of the filling chamber so that the outlet of the plasma heating melting furnace is normally closed.
[0009]
Further, the container entrance at the bottom of the filling chamber is closed when the lifter is lifted and the receptacle and the holding container are put into the filling chamber, so that the gantry comes into contact with a seal ring provided on the bottom surface of the bottom plate of the filling chamber. It is preferable to be hermetically sealed.
[0010]
The receiver is preferably provided with a lifting bar for lifting the solidified material that has been filled with the melt and cooled and solidified. In addition, the side wall of the receiver is made thin with a thickness of 3 mm or less in order to keep the volume reduction ratio as high as possible and to cool and separate the slag part and metal part into two layers. It is preferable to make it thicker than 5 mm in thickness so that it can respond to thermal shock when it is received, or to reinforce it by forming it with an amorphous refractory.
[0011]
The holding container is formed taller than the receiver in order to prevent the melt from the receiver from scattering to the periphery, and the inner peripheral surface of the tall portion is tapered upward. Preferably it is. Further, a runner leading to the outer periphery may be provided in a part of the tapered surface, and a recovery container that can receive the melt even when the melt overflows outside may be provided.
[0012]
In addition, in the waste body manufacturing apparatus, a receiver loading crane for loading a new receiver and a receiver were loaded in the course of forwarding the holding container separated from the receiver by the holding container opening device. It is preferable that a fastening device for fastening the holding container is attached.
[0013]
As described above, in the waste body manufacturing method of the present invention, the molten material discharged from the plasma heating melting furnace obtained by melting and reducing the low-level radioactive miscellaneous solid waste is received by the receiver held in the holding container and naturally cooled. Therefore, unlike in the case of cooling by directly contacting a cooling medium such as water, the amount of secondary waste is not increased due to contamination of water or the cooling medium. In addition, the receiver that has received the melt is held in a thick-walled refractory holding container made of thin-walled steel, so it does not deform, and the shape after cooling and solidification of the melt is the internal shape of the receiver. Since the entire receiver is housed in a drum can to form waste, the shape of the waste can be made to a size and shape close to the internal shape of the drum, increasing the filling rate in the drum and increasing the volume reduction rate of waste. It is done. Furthermore, when receiving the melt in the receiver, the receiver is held in a tall holding container, so there is no scattering of the melt, and the solidified body in which the melt is cooled and solidified is handled together with the receiver. There is no breakage of the solidified body, that is, cracking of the slag, separation of the metal and slag, and scattering and diffusion of the radioactive material can be prevented. In addition, the solidified product of the melt is separated into a slag layer and a metal layer in the receiver, and a waste body sealed with a drum can is obtained together with the receiver, which is suitable for inspection and remote handling.
[0014]
Moreover, according to the waste body manufacturing apparatus of the present invention configured as described above, the above manufacturing method can be carried out smoothly, surely and efficiently, and a waste body having a high waste volume reduction ratio can be obtained.
[0015]
【Example】
Embodiments of the low-level radioactive waste waste manufacturing method and apparatus according to the present invention will be described.
[0016]
First, the manufacturing apparatus will be described with reference to the drawings. In FIG. 1, reference numeral 20 denotes a plasma heating melting furnace, in which a non-combustible material melting region 22 and a melt-holding / combustible and flame-retardant material oxidation / decomposition region 23 are provided in a furnace body 21 having a refractory structure. An incombustible material supply device 24 is connected to the furnace body 21 above, and a combustible / flammable material supply device 25 is connected to the furnace body 21 above the oxidation / decomposition region 23. Further, the furnace body 21 is pivotally supported by the lower surface on the oxidation / decomposition region 23 side so as to be rotatable at the upper end of the support frame 26, and the upper end of the lifting jack 27 is pivotally supported on the lower surface of the end portion on the melting region 22 side. It is like that. An overflow wall 28 is provided at the boundary between the melting region 22 and the oxidation / decomposition region 23, and the furnace bottom of the oxidation / decomposition region 23 is inclined upward toward the tilting side of the furnace body 21, and at the end thereof. Is provided with a melt outlet 29. A plurality of plasma torches 30 and 30 ′ are provided as heat sources above the melting region 22 and the oxidation / decomposition region 23, respectively, and an oxidation / decomposition air supply port 31 and exhaust gas purification treatment are provided above the oxidation / decomposition region 23. An exhaust gas duct 33 connected to the apparatus 32 is provided, and electrodes 34 and 34 ′ are provided on the furnace bottoms of the melting region 22 and the oxidation / decomposition region 23.
[0017]
As shown in FIG. 1, the manufacturing apparatus for converting the melt discharged from the plasma heating and melting furnace 20 having such a configuration into a waste body includes a filling chamber 35 provided below the outlet 29 of the furnace body 21, and the filling A thin-walled steel receptacle 36 for receiving the melt discharged from the outlet 29 in the chamber 35 and a separate, fast-tight, thick-walled fireproof structure holding container 37 for holding the receptacle 36 38 and a container transfer device 40 for horizontally sending out a melt receiving container 36 and a holding container 37 which are provided below the filling chamber 35 and vertically lowered by the lifter 39. , A cooling hood 43 that receives the melt-accommodating container 36 and the holding container 37 fed from the transfer chamber 41 and cools the melt while being transferred by the conveyor 42, and the cooling hood 43, a holding container opening device 44 for separating the receiver 36 and the holding container 37 fed from 43, a horizontal crane 46 for hanging the solidified body integral with the holding container 37 and the separated receiver 36 into the drum can 45, A fixing material filling machine 47 for filling the drum can 45 containing the solidified body with the fixing material, and a fixing material curing conveyor for curing and fixing the fixing material while transferring the drum can 45 filled with the fixing material to form a waste body together with the drum can 45. 48 and a lid closing device 49 for closing the drum can 45 with a lid.
[0018]
The filling chamber 35 has a duct 50 connected to the exhaust gas duct 33 (see FIG. 1) of the plasma heating and melting furnace 20 as shown in FIG. 2, and the furnace main body 21 when the upper partition discharges the melt. In this example, it is a bellows 51 that can be expanded and contracted so as to be able to cope with the tilting. In addition, if a vibration exciter 52 that vibrates the receiving vessel 36 and the holding container 37 placed in the filling chamber 35 is provided at the lower portion, the dissolved gas in the melt filled in the receiving vessel 36 and the filling gas at the time of filling. It is convenient for quickly releasing bubbles in the melt by the entrained gas. Further, as shown in FIG. 3, a slide door 54 that moves forward and backward by driving the motor 53 is provided at the upper end of the bulkhead of the filling chamber 35, and the hot water outlet 29 of the furnace body 21 is normally closed. The container inlet / outlet 55 shown in FIG. 2 at the bottom of the filling chamber 35 is configured such that when the lifter 39 is raised and the receptacle 36 and the holding container 37 are put into the filling chamber 35, the gantry 38 is placed on the bottom surface of the bottom plate of the filling chamber 35. It is closed by abutting against the provided seal ring 56 and is hermetically sealed.
[0019]
As shown in FIG. 4, the receiver 36 is provided with a lifting bar 57 at a position opposed to the inner peripheral surface to make it easier to lift the solidified body that is filled in the receiver 36 and cooled and solidified. The side wall of the receiver 36 is reinforced so as not to be deformed when it is lifted. The lifting bar 57 may be fixed upright on the bottom as shown in FIG. 5 and integrated with a solidified body formed by cooling and solidifying the filled melt.
[0020]
Further, the bottom of the receiver 36 may be thick as shown in FIG. 4 so as to cope with the thermal shock when receiving the melt, or may be formed of an irregular refractory 58 as shown in FIG.
[0021]
As shown in FIG. 7, the holding container 37 has a taper 59 that expands upward on an inner peripheral surface of a portion that is taller than the receptacle 36, and a runner that leads to the outer periphery at a part of the tapered surface 59. 60 is provided, and a steel collection container 61 for receiving the overflowed melt is provided outside the runner 60 as shown in FIG. 8 even if the amount of the melt exceeds the capacity of the receiver. As shown in FIG. 8, the holding container 37 is divided into two parts and is connected to be opened and closed by an opening / closing hinge 62, and the ends of two links 64 pivotally supported in a V shape on a bracket 63 at the end of the mating side. By connecting and pressing the pivotal support 65 of the two links 64 by the holding container opening device 44, that is, by driving the cylinder 66 and pressing it by the pusher 67, the holding container is divided into two parts around the opening / closing hinge 62. 37 is rotated and opened.
[0022]
The holding container 37 separated from the receptacle 36 by the holding container opening device 44 is sent to the transfer chamber 41 by the container feeding conveyor 70 as shown in FIG. A receiver loading crane 68 for loading the container 36 and a fastening device 69 for fastening the holding container 37 loaded with the container 36 are attached. As shown in FIG. 9, the fastening device 69 locks the hook 71 in the concave portion of the pivotal support portion 65 of the two links 64 and pulls the pivotal support portion 65 by driving the cylinder 72, so that the opening / closing hinge 62 is centered. The two-divided holding container 37 is rotated and closed.
[0023]
In order to suspend the solidified body integrated with the receiver 36, the horizontal crane 46 and the receiver loading crane 68 are provided with a solidified body suspension 73 as shown in FIG. The suspension plate 74 includes a suspension plate 74 that is engaged with the lower surface of the handle 57 a at the upper end of the lifting bar 57 of the receiver 36, and a motor-driven retainer plate 75 that holds the upper surface of the handle 57 a and is sandwiched between the suspension plates 74.
[0024]
Next, a method of manufacturing a low-level radioactive waste waste using the manufacturing apparatus configured as described above will be described.
[0025]
The incombustible material supplied from the supply device 24 to the melting region 22 of the plasma heating melting furnace 20 is heated to a melting point or higher by the plasma torch 30 and melted. At the same time, the atmosphere in the furnace is heated above the oxidation / decomposition temperature of the combustible / flame retardant by the plasma torches 30, 30 ′ itself and the melt 80. The melt 80 overflows the overflow wall 28 and is sent to the adjacent oxidation / decomposition region 23, and a combustible / flame retardant material is supplied onto the melt 80 by the supply device 25, and the necessary oxidation / decomposition air is supplied. It flows from the supply port 31 to oxidize and decompose combustible and flame-retardant materials. Thus, the oxidization / decomposition residue of the combustible / flame retardant material is melted and contained integrally in the incombustible material melt 80.
[0026]
In order to produce a waste for transportation and burying from the melt 80 ′ containing the oxidation / decomposition residue, first, the outlet 29 of the furnace body 21 shown in FIG. Retract 54 and open. Next, the furnace main body 21 is tilted about the upper end pivot point of the support frame 26 by driving the lifting jack 27 to discharge the melt 80 ′ from the outlet 29, and is raised in advance into the filling chamber 35 by the lifter 39. The inside of the receptacle 36 held in the holding container 37 is filled. At this time, since the receiver 36 is held in a holding container 37 having a height higher than that of the receiver 36, the melt 80 'is not scattered outside the container, and the bottom of the receiver 36 is formed thick. It is made of refractory or refractory material, so it will not withstand thermal shock and deform. Further, the container inlet / outlet port 55 at the bottom of the filling chamber 35 is closed and airtightly sealed by contacting the base 38 of the lifter 39 with a seal ring 56 provided on the lower surface of the bottom plate of the filling chamber 35. Moreover, when the filling of the melt 80 'is completed, the slide door 54 is advanced by the drive of the motor 53, and the hot water outlet 29 is closed. Therefore, since the inside of the filling chamber 35 is connected to the exhaust gas duct 33 of the plasma heating melting furnace by the duct 50, the atmosphere is reduced by the gas attraction. Of course, since the inside of the furnace body 21 is in a reduced pressure atmosphere due to the exhaust gas attraction even when the tap 29 is open, the inside of the filling chamber 35 is also in a reduced pressure atmosphere, and the radioactive gas does not leak outside. In the melt 80 'filled in the receiver 36 in this reduced pressure atmosphere, bubbles in the melt 80' due to the dissolved gas and the entrained gas during the filling are released by natural cooling, and the melt 80 'has a difference in specific gravity. Thus, the metal layer 81 and the slag layer 82 are separately formed as shown in FIG. When the receiver 36 and the holding container 37 are vibrated by the shaker 52, the dissolved gas and bubbles are quickly released from the melt 80 'in the receiver 36. Thus, after the melt 80 'is solidified by natural cooling for a certain time, the receiver 36 and the holding container 37 are lowered into the transfer chamber 41 shown in FIG. Then, the receptacle 36 and the holding container 37 are sent out from the transfer chamber 41 by the container transfer device 40 and put into the cooling hood 43. The receiver 36 and the holding container 37 that have entered the cooling hood 43 cool the melt 80 ′ in the receiver 36 that has solidified while being transferred by the conveyor 42. When the melt 80 ′ is cooled, the receiver 36 and the holding container 37 are sent out of the cooling hood 43, where the holding container 37 is opened by the holding container opening device 44. That is, the cylinder 66 of the holding container opening device 44 shown in FIG. 8 is driven, and the pusher 67 presses the pivots 65 of the two links 64 of the holding container 37 to hold the opening / closing hinge 62 at the center. The container 37 is rotated and opened. The solidified body 83 integrated with the receiver 36 thus separated from the holding container 37 is suspended and transferred by the solidified body lifting tool 73 shown in FIG. 10 of the horizontal crane 46, and is put into the drum can 45. The drum can 45 is filled with the fixing material 84 by the fixing material filling machine 47, and the fixing material 84 is cured and solidified while the drum can 45 filled with the fixing material 84 is transferred by the fixing material curing conveyor 48. It becomes waste body 85. Then, the lid 86 is fitted and fixed to the drum 45 by the lid closing device 49.
[0027]
In this way, the receiver 36 is housed in the drum can 45 to form the waste body 85, so that the waste has a size and shape close to the internal shape of the drum can 45, and the filling rate of the waste in the drum can 45 is increased. Volume reduction ratio is improved. Further, as described above, the solidified body 83 of the melt 80 ′ is separated into the metal layer 81 and the slag layer 82 in the receiver 36, and becomes the waste body 85 sealed in the drum can 45 together with the receiver 36. When transporting and burying, inspection and remote handling are easy.
[0028]
The opened holding container 37 is transferred to the transfer chamber 41 by a container transfer conveyor 70 as shown in FIG. 1, and a new receiver 36 is loaded by a receiver loading crane 68 on the way, In the two-piece holding container 37 in which the receiver 36 is inserted, the hook 71 of the fastening device 69 locked in the recesses of the pivot support portions 65 of the two links 64 is pulled by the drive of the cylinder 72 and the pivot support portion 65. Is pulled and closed about the opening / closing hinge 62 to be closed and fastened. And it is sent to the transfer chamber 41 by the container forwarding conveyor 70.
[0029]
The process of manufacturing one waste body 85 has been described above, but the waste body 85 is sequentially manufactured in the same process.
[0030]
The holding container 37 in the above-described embodiment is opened and closed by rotating around the opening / closing hinge 62. However, as shown in FIGS. Alternatively, the rails 38 'may be mounted so as to advance and retreat in opposition to each other, moved forward and closed by container opening and closing devices 90 and 90, and opened and moved backward.
[0031]
【The invention's effect】
As can be seen from the above description, according to the waste production method after the volume reduction treatment of the low-level radioactive waste of the present invention, in the treatment process of the melt discharged from the plasma heating melting furnace, cooling water, exhaust gas, etc. Secondary waste will not increase. In addition, the solidified shape of the melt can be made to a size and shape close to the internal shape of the drum can, the filling rate in the drum can be increased, and the volume reduction ratio of the waste can be increased. Furthermore, since there is no scattering of the melt in the discharge process of the melt to the receiver, and the solidified body in which the melt is cooled and solidified is handled together with the receiver, the solidified body is broken, that is, the slag is broken, the slag and the metal are separated. And the scattering and diffusion of radioactive material can be prevented. In addition, the solidified product of the melt is separated into a metal layer and a slag layer in the receiver, and a waste body sealed in a drum can is obtained together with the receiver, so inspection and remote handling during transportation and embedding are easy. It becomes.
[0032]
In addition, according to the waste body manufacturing apparatus after the melting and volume reduction processing of the low-level radioactive waste of the present invention, the waste body manufacturing method after the melting and volume reduction processing that exhibits the above-described excellent effects can be achieved smoothly, reliably, and efficiently. A waste body that can be implemented well and has a high volume reduction rate is obtained.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a system diagram of an embodiment of a waste body manufacturing apparatus after low volume radioactive waste melting and volume reduction processing of the present invention.
2 is an enlarged cross-sectional view showing a filling chamber in the manufacturing apparatus of FIG. 1. FIG.
3 is a view showing a slide door that opens and closes a plasma heating and melting furnace outlet provided in the filling chamber of FIG. 2. FIG.
FIG. 4 is a cross-sectional perspective view showing a melt receiver in the manufacturing apparatus of FIG. 1;
5 is a cross-sectional perspective view showing another modified example of the receiver of FIG. 4. FIG.
6 is a cross-sectional perspective view showing still another modification of the receiver of FIG.
7 is a partially cutaway side view showing a holding container and a holding container opening device in the manufacturing apparatus of FIG. 1. FIG.
8 is a plan view of FIG. 7. FIG.
9 is a side view showing a holding container and a holding container fastening device in the manufacturing apparatus of FIG. 1. FIG.
10 is a view showing a solidified body hanging tool of a horizontal crane and a receiver loading crane in the manufacturing apparatus of FIG. 1; FIG.
11 is a cross-sectional view showing a state in which a melt filled in the receiver of FIG. 4 is separated into a metal layer and a slag layer by cooling and solidified.
12 shows another example of an apparatus for opening and closing the holding container in the manufacturing apparatus of FIG. 1, wherein a is a plan view and b is a vertical side view.
FIG. 13 shows an example of a conventional method for cooling and solidifying a melt of non-combustible low-level radioactive waste.
FIG. 14 is a diagram showing another example of a conventional method for cooling and solidifying a melt of non-combustible low-level radioactive waste.
FIG. 15 is a view showing still another example of a conventional method for cooling and solidifying a melt of non-combustible low-level radioactive waste.
[Explanation of symbols]
20 Plasma Heating and Melting Furnace 29 Outlet 35 Filling Chamber 36 Receiving Unit 37 Holding Container 38 Base 39 Lifter 40 Container Transfer Device 41 Transfer Chamber 42 Conveyor 43 Cooling Hood 44 Holding Container Opening Device 45 Drum Can 46 Horizontal Crane 47 Fixing Material Filling Machine 48 Fixing Material curing conveyor 49 Lid closing device 50 Duct 51 Bellows 52 Exciter 53 Motor 54 Slide door 55 Container entry / exit port 56 Seal ring 57 Lift bar 58 Unshaped refractory 60 Runway 61 Collection container 68 Receptor loaded crane 69 Holding container Fastening device 73 Solidified body lifting device 80 Melt 81 Metal layer 82 Slag layer 83 Solidified body 84 Fixing material 85 Waste body 86 Lid

Claims (8)

  The low-level radioactive miscellaneous solid waste melted and discharged from the plasma heating melting furnace is filled into a thin-walled steel receiver held in a thick-walled refractory holding container in a reduced-pressure atmosphere. Air bubbles in the melt due to dissolved gas and entrained gas are released by cooling, and the melt is separated into a metal layer and a slag layer based on the difference in specific gravity. After cooling, remove the holding container, insert the solidified body integrated with the receiver into the drum can, fill and solidify the fixing material to make the waste, and close the lid. Waste body manufacturing method after melting and volume reduction treatment. A filling chamber provided below the outlet of a plasma heating melting furnace for melting and reducing low-level radioactive solid waste, and having a duct communicating with the exhaust gas treatment system of the plasma heating melting furnace. A filling chamber having a structure in which a partition wall can be expanded and contracted ; a thin-walled steel receiver that receives the melt discharged from the tap in the filling chamber; and a thick and fire-resistant structure that can be separated and fastened by holding the receiver And a container transfer device for horizontally sending out a melt receiving container and a holding container which are provided below the filling chamber and are vertically lowered by the lifter. A transfer hood, a cooling hood that cools the melt while receiving and transporting the receiver and holding container for the melt sent out from the transfer chamber, and a receiver and a holding container sent out from the cooling hood A holding container opening device for separating, a horizontal crane for hanging a solid body integrated with the holding container and the separated receiver into a drum can, a fixing material filling machine for filling the drum can containing the solid body with a fixing material, and fixing melting volume reduction of the fixed member curing conveyor and, more becomes low-level radioactive waste and a lid closing device for closing the lid in drums which forms a filled each drum by a fixing material while transferring the drums aged solidified waste of wood Waste body manufacturing equipment after treatment. 3. The low-level radioactive waste melting and volume reducing process according to claim 2 , wherein a vibration exciter for vibrating the receiver and the holding container placed in the filling chamber is provided at a lower portion of the filling chamber. Waste body manufacturing equipment. 4. A low-level radioactive waste melting and volume reducing process according to claim 2, wherein a drive type sliding door for closing the outlet of the plasma heating and melting furnace is provided at the upper end of the partition wall of the filling chamber. Waste body manufacturing equipment. A sealing mechanism is provided on the bottom surface of the bottom plate of the filling chamber, and when the lifter is raised and the receiver and the holding container are put into the filling chamber, the gantry comes into contact with the sealing mechanism, and the container entrance at the bottom of the filling chamber is The apparatus for producing a waste body after melting and volume-reducing treatment of low-level radioactive waste according to any one of claims 2 , 3 and 4 , wherein the apparatus is closed and hermetically sealed. The receiver is equipped with a lifting bar, and the side wall of the receiver is made of thin steel with a thickness of 3 mm or less, and at the same time the bottom of the receiver is made with a thickness of 5 mm or more, or is formed with an irregular refractory. The waste body manufacturing apparatus after melting and volume-reducing treatment of low-level radioactive waste according to any one of claims 2 to 5 , wherein The holding container has a taper that expands upward on the inner peripheral surface of the portion that is taller than the receiver, and a melt that overflows to the outside of the tapered surface that is provided with a runner that leads to the outer periphery. An apparatus for producing a waste body after melting and volume-reducing treatment of low-level radioactive waste according to any one of claims 2 to 6, wherein a recovery container for receiving the waste is provided. A receiver loading crane for loading a new receiver and a fastening device for fastening the holding container loaded with the receiver while the holding container separated from the receiver and the solidified body is being routed by the holding container opening device Is attached to the waste body manufacturing apparatus after the melting and volume reduction processing of the low-level radioactive waste according to any one of claims 2 to 7 .

Images