JPH04249800A - Processing and recycling method of radioactivity-containing polluted material - Google Patents

Abstract

PURPOSE:To lessen the volume of polluted material after processing, low control a radioactivity level of a substance dispersed at the time of the processing, and further obtain a solid material of reusable metal or ceramic and the like as a radioactivity generation source. CONSTITUTION:A radioactivity-containing polluted material is housed in a metal vessel, made a molding by push pressure molding, it is fed to the lower side of an edge part 9 of a plurality of electrodes 1-3, 1A-3A of a multi-phase arc generator 200, and here a molding 12 to be processed is melted by a plurality of arcs 10 generated between the electrodes. Next, the molten material 15 is poured into a mold 16 to coagulate, the mold 16 is opened and a solid material of a specified shape is taken out.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention relates to a method for treating and regenerating radioactive pollutants, and in particular, the present invention relates to a method for treating and regenerating radioactive pollutants, particularly for processing and regenerating all radioactive pollutants including radioactive waste and radioactively contaminated sand generated from nuclear power plants, etc. It's about how to do it.

0002

2. Description of the Related Art Radioactive particles are attached to waste materials associated with nuclear power plants, such as the clothes of workers used in the power plants and the sludge produced. For this reason, they had to be completely disposed of, and the conventional method was to store them in a container, harden the outer periphery with concrete, and dump it into the sea to prevent radiation leakage.

0003

[Problems to be Solved by the Invention] However, the above method has the problem that the dumping operation is time-consuming and the volume of the dumped material becomes large. In addition, there is a risk of air pollution if radioactive materials are incinerated in the atmosphere.
At normal incineration temperatures, the volume of residue after incineration is large, making it difficult to select a disposal site.

[0004] In addition to such radioactive industrial waste, there is also the problem of radioactively contaminated sand in areas such as Ningyo Pass where uranium deposits exist, and it is necessary to remove this to eliminate the risk of radioactivity. There were problems in that it would require a large amount of waste to be disposed of, and it would be difficult to choose a place to dispose of it.

[0005] This invention was made in order to solve the above-mentioned problems, and it is possible to reduce the volume of radioactive pollutants after treatment, and to keep the radioactivity of the substances dissipated during treatment to a low level. It is also possible to convert the radioactive pollutants mentioned above into solid materials such as metals or ceramics that can be reused as radiation sources, etc., and it is also possible to efficiently treat large amounts of radioactive pollutants. The purpose of this study is to obtain a method for treating and regenerating radioactive pollutants.

[0006]

[Means for Solving the Problems] A method for treating and regenerating radioactivity-containing pollutants according to the present invention applies each phase voltage of a multiphase AC power source to each of a large number of electrodes to generate a plurality of arc discharges between each electrode. A method for processing and regenerating radioactivity-containing pollutants using a multi-phase multi-electrode arc generator that generates This process includes a melting process and a solidification process in which the molten pollutants are solidified and taken out as a solid substance in a predetermined shape.

[0007] The present invention provides the above method for treating and regenerating radioactivity-containing pollutants, in which in the melting step, the radioactivity-containing pollutants or a metal container containing the same is press-molded to form the treated object into a predetermined shape. the molded body to be treated is supplied along a predetermined guide member to an arc generation region near the plurality of electrodes, and the molded body to be treated is irradiated with a plurality of arcs in the arc generation region. This is to be melted.

[0008] The present invention provides the above-mentioned method for treating and regenerating a radioactivity-containing pollutant, in which in the above-mentioned press molding, the radioactivity-containing pollutant or a metal container containing the same is formed into a rectangular parallelepiped shape, and the above-mentioned radioactivity-containing pollutant or a metal container containing the same is formed into a rectangular parallelepiped shape, In order to supply the molded objects to be processed, the rectangular parallelepiped molded objects are fed one after another onto the guide member, and the objects are slid from the rear to the front by pushing the one in front, until they are positioned at the end of the guide member. This is done by sequentially sending out the arc to the area where the arc occurs.

[0009] In the method for treating and regenerating radioactivity-containing pollutants, the present invention uses a cylindrical body as the guide member, and arranges each electrode as the plurality of electrodes at equal intervals around the end of the cylindrical body. In the melting process, the radioactivity-containing pollutant or a metal container containing the same is pressed into an elongated cylinder shape, and the cylindrical molded objects to be treated are successively placed into the cylindrical body. It is inserted and sequentially sent out to the central part of the arc generation area, and the above-mentioned melting process is performed in the area.

[0010] The present invention uses a pipe-shaped member as the guide member in the above-mentioned method for treating and regenerating radioactivity-containing pollutants, and in the above-mentioned melting process, radioactive ash or granular radioactive waste is transferred into the pipe-shaped member. The radioactive ash or granular radioactive waste is continuously supplied to the arc generating area through the arc generating area, where the radioactive ash or granular radioactive waste is irradiated with multiple arcs and melted.

[0011] In the above-mentioned method for treating and regenerating radioactive pollutants, the present invention provides a polyphase AC power supply having positive and negative contacts connected to the positive and negative voltages of a DC power supply. A plurality of conversion units that convert direct current to alternating current, consisting of a switch circuit that can turn on and off the side contacts or switch between the positive side and negative side contacts, and an induction circuit connected to the switch circuit; The power supply device includes a control circuit that sequentially switches and controls the switch circuits of each of the converters at a predetermined time difference, and outputs a multiphase AC voltage.

0012

[Operation] In this invention, since multiple arcs of a multi-phase multi-electrode arc generator are used to melt radioactive pollutants, the radioactive pollutants become molten at an extremely high temperature. Electromagnetic forces and rotating magnetic fields from multiple arcs act on the molten material in a normal state, and vibrations are applied to the molten material. As a result, the metal component and the ceramic component, which vibrate in a natural manner, are completely separated. Further, since the high temperature region caused by the arc is localized, rapid heating and cooling are possible, and the metal and ceramic can be solidified in an amorphous state while being separated. Therefore, the treated pollutants can be taken out as small-volume metal or ceramic lumps.

[0013] Furthermore, in the high-temperature treatment using the arc, the radioactivity content of the dissipated substance decreases and the radioactivity content of the solidified solid material increases. Therefore, it is possible to reuse the solidified solid matter as a source of low-level radiation, and the risk of radioactivity can be reduced to almost nothing by collecting the dissipated materials and repeating the arc treatment. It can also be removed and returned to the natural world.

Furthermore, by extracting the molten substance of the pollutant as a solid substance in a desired shape, that is, a metal lump or a ceramic lump, handling and transportation become easier, and even if the substance is disposed of, the pollution caused by the above melting process is reduced. Coupled with the reduction in the volume of objects, disposal work becomes easier.

Further, in the present invention, radioactivity-containing pollutants are housed in a metal container, and a molded article of a predetermined shape obtained by press-molding the metal container is moved along a predetermined guide member to an arc generation area. Since the radioactive materials are supplied sequentially, radioactivity-containing pollutants can be efficiently melted in large quantities.

[0016] Furthermore, in this invention, radioactive waste is continuously supplied to the arc generation area through the pipe-shaped member by, for example, blowing air, so that the melting process of ash or granular radioactive waste is facilitated. It can be carried out.

[0017] Furthermore, in the present invention, the multi-phase AC power supply has a switch circuit capable of turning on and off the positive side and negative side contacts of the DC power supply, or switching between the positive side and negative side contacts. Since we used a power supply device that outputs multiphase AC voltage, it is equipped with a plurality of conversion units that convert the voltage into AC voltage, and a control circuit that sequentially switches and controls the switch circuits of each of the conversion units with a predetermined time difference. Even in places without a power source, as long as there is a DC power source, radioactivity-containing pollutants can be treated and recycled as described above.

[0018]

[Example] Fig. 1(a) is a diagram for explaining a method for treating and regenerating radioactive pollutants according to an embodiment of the present invention.
(b) is a diagram showing the state of treatment of the radioactivity-containing pollutant. In the figure, reference numeral 100 denotes a treatment and regeneration apparatus for treating and regenerating radioactivity-containing pollutants, and is composed of a multi-phase, multi-electrode plasma arc generator 200 and an arc treatment section 300 for the object to be treated. The multi-phase multi-electrode plasma arc generator 200 is composed of six graphite electrodes 1, 2, 3, 1A, 2A, 3A and a three-phase AC power source 7, and the six electrodes have an inverted conical shape. The electrodes are arranged radially at equal angles (60° intervals) when viewed from above, so as to form an electrode tip 9 and converge at the electrode tip 9. Here, each electrode can be moved forward and backward by an electrode feeding mechanism (not shown), and adjustments are made for wear and tear of the electrodes. In addition, 4, 5, and 6 are current phase adjustment devices with 3-phase AC output for adjusting the strength of the arc, and 10 is a current phase adjustment device with three-phase AC output, and 10 is a plurality of current phase adjustment devices between the six graphite electrodes 1, 2, 3, 1A, 2A, and 3A. This is a non-transferring plasma arc that is obtained so as to eject downward from the electrode tip 9 at the same time as the arc of .

[0019] Furthermore, in the arc processing section 300,
Reference numeral 12 denotes a molded object to be treated, which is obtained by storing radioactive waste from a nuclear power plant or the like in a metal container, and pressing the container together into a rectangular parallelepiped shape. Reference numeral 13 denotes a guide member for conveying the molded object 12 to be processed, the terminal end 14 of which is located below the electrode tip 9, which receives the melt of the molded object to be processed and transfers it. This is a part for pouring out into the formwork 16 in the latter stage. Here, the mold 16 is composed of a pair of divisible mold pieces 16a and 16b.

The multi-arc generated by this multi-phase multi-electrode plasma arc generator has the following characteristics.

[0021] [0021] Regardless of whether it is in the atmosphere, in a liquid, or in a vacuum, an ultra-high temperature arc charged with negative electron ions is generated.

[0022] Since a heat source of 4000°C or higher can be obtained at the same time as the switch is turned on, even high melting point substances can be melted and melted.

[0023] Since a rotating magnetic field is generated at the tip of the electrode, an electrical stirring effect on the object to be treated can be expected.

(2) It is possible to increase the number of phases and the number of electrodes by a multiple of 3, making the electrode diameter thicker and increasing the load current so that even a large amount of material can be processed in a short time.

[0025] ■ Multi-phase alternating current (3-phase, 6-phase, etc.) is used, and the total current of each phase is always 0, and there is no need for a ground wire. Therefore, since there is no need to use a material other than metal as a counter electrode, even non-conductive refractories can be directly heated, sintered, and melted.

[0026] If a neutral electrode is provided at the center of the plurality of electrodes, a more powerful plasma arc will be generated.

Next, a processing reproduction method will be explained. Radioactive waste from a nuclear power plant is packed into a metal container such as a drum, and this is press-molded to form a rectangular parallelepiped shaped body 12 to be processed. Next, the molded bodies 12 to be processed are sequentially fed onto predetermined guide members 13 and continuously supplied to the arc generation region 14 at the end of the guide members 13 . Then, in the arc generation region 14, the molded object 12 to be processed is irradiated with a multi-arc and continuously melted. At this time, the melt 1
5 flows down to the receiving part 14 at the end of the guide member 13, and further flows into the mold 16 for forming into a predetermined shape, where it is solidified. After solidification, the pair of formwork pieces 16a, 16b
Divide and take out the cylindrical solids. Note that the shape of the solid material may be, for example, a rectangular parallelepiped shape or a cubic shape suitable for transportation or the like, as well as a desired shape depending on the use of the solid material.

As described above, in this embodiment, a drum filled with radioactive waste from a nuclear power plant is press-molded into a rectangular parallelepiped shape, and the molded bodies 12 to be processed are sequentially fed into the guide member 13 to form an arc at the end of the guide member 13. Since it is sent to the generation area and sequentially melted there, it is possible to dispose of radioactive waste in large quantities and efficiently using multi-arc.

[0029] Furthermore, when nuclear-related waste or natural radioactive mineral residues are melted using the multi-arc flame, they become metals, ceramics, or composites of these and other substances, and the volume may be reduced to 1/10 depending on the product. It becomes ~1/20 of that, and becomes an extremely hard metal material that does not rust, or a ceramic material that does not crack even when rapidly heated or cooled. This makes it easier to handle the treated waste and process it for reuse. In addition, since the above-mentioned metallic substances and ceramic substances have different natural frequencies, even if these mixed melts are solidified in the same mold, the metal will not completely settle in the lower part and the ceramic in the upper part. It will separate and solidify. Therefore, after the solid material is taken out from the mold, it can be easily separated into the metallic solid material and the ceramic solid material.

[0030] In this case, the waste may be a large tangible waste,
This processing method can treat any kind of material, including broken solids, powders, metal shavings, and the like. Furthermore, it can be processed in air, water, atmosphere, vacuum furnace, etc. Of course, metal waste, ceramic waste, combustible waste, etc. may be mixed and packed in one drum for disposal.

[0031] Also, discarded clothes, wood, plastic, paper, etc.
It is also possible to melt entire drums filled with various materials such as oil and ash using multi-arc flames. At this time, for example, a container containing clothing waste may be crushed to form an appropriate shape and then melted using a multi-arc. In addition, the various types of waste listed above may be processed in the furnace at the same time, and in this case, all of the various wastes become molten ceramic and metal, and both can be easily separated and collected to take out the solid material in a predetermined shape. It is also convenient for processing for subsequent reuse.

Furthermore, when it is desired to recycle treated ash having radioactivity, a drum can filled with the treated ash can be processed into a predetermined shape, and the treated ash can be melted together with the container using a multi-arc. Furthermore, the molten material can be made into any size and shape such as a rod, pipe, plate, block, etc., and can be mixed and melted with other substances to impart new properties to the resulting solid material.

This multi-arc is different from conventional arcs, which require metal to emit an arc or require a ground wire, but unlike a gas burner, it emits an arc flame of over 4000°C the moment it is turned on. , occurs regardless of whether it is underwater, in the air, or in a vacuum. Moreover, the temperature can be raised to tens of thousands or even hundreds of thousands of degrees, and the direction of the arc flame can be controlled automatically by applying an electromagnetic field, making it easy to work with unmanned robots.

[0034] Furthermore, if oyster shells etc. adhering to the drainage ditch of a nuclear power plant, which may be located underwater, are subjected to multi-arc treatment using an underwater multi-arc torch, the adhesion force will be reduced due to thermal alteration and they will be removed. easy to remove and can be easily removed. Furthermore, the extracted oyster shells and the like can be melted and solidified using a multi-arc to become a useful ceramic and can be recycled and utilized. Multi-arc processing is also effective for melting, cutting, and demolishing structures, whether in the air or underwater, and can be safely processed using arc flames using robots.

Furthermore, it is also possible to treat the highly radioactive liquid used for cooling the nuclear reactor. In other words, if such a highly radioactive liquid is mixed with materials that easily absorb radioactivity or are easily combusted or incinerated, or other waste from nuclear power plants, and then melted using a multi-arc,
The radioactivity level of the water vapor that evaporates during treatment is reduced, while the radioactivity is condensed and remains in the solidified solids. Therefore, by repeating this process on the water vapor, a highly radioactive liquid can be changed into a safe liquid that is extremely weakly radioactive.

[0036] Furthermore, the radioactivity-condensed solid can be reused as a source of low-level radioactivity. for example,
Safety can be improved by forming the above solid object into the shape of a fountain pen or the like, that is, a shape that is easy for a person to hold, and coating it with magnetic steel, which has a radiation shielding effect, by a method such as thermal spraying, except for the tip. A radiation source that is expensive and extremely easy to handle can be obtained. It is also possible to form the solid substance into a minute sphere, attach it to the tip of the fountain pen-shaped holding member, and use this as a radiation source. Such radiation sources currently have the potential for effective use, particularly in medical technology, and are thought to open the door to effective use in other technical fields in the future.

[0037] In the above embodiment, a radioactive pollutant is placed in a metal container and the metal container is press-formed. However, the radioactive pollutant can be press-molded as is. It does not necessarily have to be placed in a metal container.

FIG. 2 is a diagram showing a method for treating radioactivity-containing pollutants according to a second embodiment of the present invention, with FIG. 2(a) being a side view and FIG. 2(b) being a bottom view. Here, a method is shown in which a cylindrical object is pushed down into the center of an arc flame and melted. In the figure, the same reference numerals as those in FIG. 1 indicate the same or corresponding parts, 22 is a molded object to be processed which is formed into an elongated cylinder by press-molding a drum can filled with waste, and 23 is a molded object to be processed 22 which is formed into an elongated cylindrical shape. This is a cylindrical guide member that leads to the center of the multi-phase electrode.

In this method, as in the case of the above embodiment, the waste is packed into a drum, the drum is press-molded to form the molded object 22 to be processed, and this is passed through the cylindrical guide member 2.
3 and supplied to the arc generation area at the end of the guide member 23, where it is melted by multi-arc. Thereafter, the molten material is solidified by post-processing and taken out as a solid material in a predetermined shape.

In this embodiment, the cylindrical guide member is made of metal, and if the neutral of the power supply is connected to this, an arc will also be generated in this drum can, and the melting process will be performed by a powerful multi-arc. can do.

[0041] In each of the above embodiments, a method was shown in which a metal container containing radioactive waste was press-molded to form a molded object of a predetermined shape, and the molded object was sequentially sent to an arc treatment area for treatment. It is also possible to feed the waste directly into the arc treatment section, that is, into the center of the arc flame.

FIG. 3 shows, as an example of such a method, a method for treating radioactive pollutants according to a third embodiment of the present invention. It is a pipe for conveying, and its tip is located in the arc generation area, that is, in the upper center of the multi-phase multi-electrode, and the tip serves as a nozzle part 33a whose inner diameter is slightly smaller than the other parts. There is.

In this configuration, the radioactive waste 32 is guided through the pipe 33 to the upper part of the multi-phase multi-electrode, and is directly dropped into the center of the arc flame, where it is melted. Then, the molten material is solidified and taken out in the same manner as in the above embodiment.

In this embodiment, it is possible to efficiently process a large amount of radioactively contaminated sand, ash, etc. from Ningyo Pass, etc. Further, if a carbon round frame, heat-resistant ceramic, or carbon is used as the above-mentioned conveying pipe and this is made neutral, the arc will also fly there and the throughput will be increased.

In the above embodiment, a three-phase voltage is used as the multi-phase AC power supply, but in places where there is no three-phase power supply, a DC power supply or a single-phase power supply may be used. The same voltage may be applied to a plurality of electrodes, the number of which is a multiple of 2, to generate an arc between the plurality of electrodes. Alternatively, a three-phase voltage may be generated from a direct current or single-phase power source to generate an arc between a plurality of electrodes. At this time, many arc waveforms are generated depending on the combination of power supplies, but it is desirable to use the arc method that is most effective for processing the target object.

FIGS. 4 and 5 are diagrams for explaining a method for treating and regenerating radioactivity-containing pollutants according to a fourth embodiment of the present invention. In this embodiment, three A power supply device that generates phase current is used.

In the figure, 30 is a DC power supply, 20a to 2
0c is a plurality of conversion parts that convert DC power to AC power,
It has positive side and negative side contacts 24a to 24c and 25a to 25c connected to the positive and negative voltages of the DC power supply 30, and turns the positive and negative side contacts on and off, or the positive side and the negative side. Each switch circuit 21a that can switch between each contact on the side
21c, and each induction circuit 22a to 22c connected to each of the switch circuits 21a to 21c. Also 26a~
26c is each output terminal of each of the conversion units 21a to 21c,
Each electrode 1-3, 1A-3A is connected to each output terminal. 27 is a neutral electrode connected to the intermediate potential of the DC power source 30, but is not used here. In addition, 31 is a phase difference (1/3 TO
) is a control circuit for switching and controlling each of the switch circuits 21a to 21c, and the other configuration is the same as that of the first embodiment.

In this embodiment, when the control circuit 31 switches and controls each of the switch circuits 21a to 21c,
Three-phase alternating current as shown in FIG. 5 is outputted to the output terminals 26a to 26c of each conversion section, and
A multi-arc 10 is generated between the two, and as a result, radioactivity-containing pollutants are treated and regenerated similarly to the first embodiment.

In such an embodiment, since three-phase alternating current can be generated from a direct current power source, the above-mentioned treatment and regeneration of radioactivity-containing pollutants is possible even in places where there is no three-phase power source.

[0050] In the above fourth embodiment, a case has been described in which a power supply device that generates three-phase AC from a DC power source is used in the processing and regeneration method of the first embodiment.
It can also be used in the treatment and regeneration method of the embodiment, in which case the plasma arc can be strengthened by connecting the neutral electrode 27 to the guide member 23 or the conveying pipe 33 as shown by dotted lines in FIG.

[0051]

As described above, according to the method for treating and regenerating radioactivity-containing pollutants according to the present invention, a plurality of arcs of the above multi-phase multi-electrode arc generator are used to melt various radioactivity-containing pollutants. As a result, the radioactive pollutants reach an extremely high temperature molten state, and electromagnetic vibrations and rotating magnetic fields from multiple arcs are applied to the molten material in this state, causing the molten material to be electrically and mechanically damaged. This will cause the metal component and the ceramic component to be completely separated. Further, since the high temperature region caused by the arc is localized, rapid heating and cooling are possible, and the metal and ceramic can be solidified in an amorphous state while being separated. Therefore, it is possible to take out the treated pollutants as small-volume metal lumps or ceramic lumps.

[0052] Furthermore, in the high-temperature treatment using the arc, the radiation content of the dissipated substance decreases, and the radioactivity content of the solidified solid substance increases. For this reason, it is possible to reuse the solidified solid material as a radiation source, etc., and by collecting the dissipated materials and repeating the arc treatment, the risk of radioactivity is almost eliminated and it can be used in the natural world. You can also change it back to .

Furthermore, by extracting the molten substance of the pollutant as a solid substance in a desired shape, it becomes easier to handle and transport, and even when disposed of, the volume of the pollutant decreases due to the melting process. Disposal work etc. will also become easier.

[0054] Furthermore, radioactivity-containing pollutants are housed in a metal container, and molded objects of a predetermined shape obtained by press-molding the metal container are sequentially supplied to the arc generation area along a predetermined guide member. As a result, radioactivity-containing pollutants can be efficiently treated in large quantities.

Furthermore, since the radioactive waste is continuously supplied to the arc generation area through the cylindrical guide member, it is possible to easily melt and process the ash or granular radioactive waste. .

Furthermore, the multiphase AC power supply has a switch circuit capable of turning on and off the positive and negative contacts of the DC power supply, or switching between the positive and negative contacts, and converts DC to AC. Since we used a power supply device that outputs polyphase AC voltage, it is equipped with a plurality of converters for converting into AC voltage, and a control circuit that sequentially controls switching of the switch circuits of each converter at a predetermined time difference. Even in places where there is no radioactivity, as long as there is a DC power supply, it is possible to treat and regenerate radioactive pollutants as described above.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a method for treating and regenerating radioactivity-containing pollutants according to an embodiment of the present invention.

FIG. 2 is a diagram showing a method for treating and regenerating radioactivity-containing pollutants according to a second embodiment of the present invention.

FIG. 3 is a diagram showing a method for treating and regenerating radioactivity-containing pollutants according to a third embodiment of the present invention.

FIG. 4 is a diagram showing a method for treating and regenerating radioactivity-containing pollutants according to a fourth embodiment of the present invention.

FIG. 5 is a diagram showing an output waveform of the power supply device used in the fourth embodiment.

[Explanation of symbols]

1, 2, 3, 1A, 2A, 3A Electrode 4, 5, 6
Phase adjustment device 7
3-phase AC power supply 12, 22
Molded object to be processed 13
,23
Guide member 14
Receiving part 15
Melt 20a,
20b, 20c converter 21a, 2
1b, 21c switch circuit 22a
, 22b, 22c induction circuit 30

DC power supply 31
Switch control circuit 32
Ash or granular radioactive waste33
Conveying pipe 33a
Nozzle part 100
Processing and reproducing device 200
Multiphase multielectrode plasma arc generator

Claims (6)

[Claims] Claim 1: Using a multi-phase multi-electrode arc generator that applies each phase voltage of a multi-phase AC power supply to each of a large number of electrodes to generate a plurality of arc discharges between each electrode, radioactivity-containing pollutants can be removed. The method includes a melting process in which radioactivity-containing pollutants are melted by multiple arcs of the multi-phase multi-electrode arc generator, and solidifying the molten pollutants into a solid material of a predetermined shape. 1. A method for processing and regenerating radioactive pollutants, the method comprising a coagulation step of extracting them as a substance. 2. In the method for treating and regenerating radioactivity-containing pollutants according to claim 1, in the melting step, the radioactivity-containing pollutants or a metal container containing the same are press-molded to form a target of a predetermined shape. forming a treated molded body, supplying the molded body to be treated along a predetermined guide member to an arc generation region near the plurality of electrodes, and irradiating the molded body to be treated with a plurality of arcs in the arc generation region; A method for treating and regenerating radioactivity-containing pollutants, which comprises melting the radioactive substances. 3. In the method for processing and regenerating radioactivity-containing pollutants according to claim 2, in the press molding, the radioactivity-containing pollutants or the metal container containing the same are formed into a rectangular parallelepiped shape, and the arc generation The molded objects to be processed are supplied to the area by feeding the rectangular parallelepiped shaped objects onto the guide member one after another, and sliding them by pressing the one in front from the rear until the end of the guide member is supplied. 1. A method for treating and regenerating radioactive pollutants, characterized in that the method is carried out by sequentially sending the materials to an arc generating area located in the area. 4. The method for treating and regenerating radioactivity-containing pollutants according to claim 2, wherein a cylindrical body is used as the guide member, and each electrode as the plurality of electrodes is arranged evenly around the terminal end of the cylindrical body. In the melting process, the metal container is press-formed into an elongated cylindrical shape, and the cylindrical molded objects to be treated are inserted into the cylindrical body one after another to form the arc generating area. A method for processing and regenerating radioactivity-containing pollutants, characterized by sending the material to a central region and performing the above-mentioned melting treatment in the central region. 5. The method for treating and regenerating radioactive pollutants according to claim 1, wherein a pipe-shaped member is used as the guide member, and in the melting step, radioactive ash or granular radioactive waste is melted into the pipe-shaped member. A radioactive pollutant characterized in that it is continuously supplied through a member to an arc generation area, and in the arc generation area, radioactive ash or granular radioactive waste is irradiated with multiple arcs and melted. Processing and regeneration method. 6. The method for treating and regenerating radioactive pollutants according to claim 1, wherein the multiphase AC power supply has positive and negative sides connected to the positive and negative voltages of a DC power supply. Consisting of a switch circuit that has contacts and can turn on and off the positive and negative contacts, or switch between the positive and negative contacts, and an induction circuit connected to the switch circuit,
It is characterized by comprising a plurality of converting sections that convert direct current to alternating current, and a control circuit that sequentially controls switching of switch circuits of each of the converting sections at a predetermined time difference, and outputs a multiphase alternating current voltage. A method for processing and regenerating radioactive pollutants.