JP2006138718A - High level radioactive waste geological disposal equipment and geological disposal method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide geological disposal equipment having a further enhanced confinement performance by housing and sealing high level radioactive waste such as glass-solidified matter and inhibiting corrosion of a geological disposal container subjected to geological disposal, and also to provide a geological disposal method. <P>SOLUTION: The geological disposal equipment 1 for high level radioactive waste comprises: the geological disposal container 10 primarily composed of a metal-made container body 11 for housing and sealing the high level radioactive waste; a buffer material container 20 covering the whole surface of the geological disposal container; and corrosion-inhibiting means 13a and 13b for electrochemically inhibiting corrosion on the surface of the container body by applying a potential difference between the container body and the buffer material container. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a geological disposal apparatus and a geological disposal method for preventing corrosion of a geological disposal container for hermetically storing high-level radioactive waste and improving long-term soundness.

  The vitrified product obtained by solidifying the high-level radioactive liquid waste generated by reprocessing spent fuel burned in the nuclear reactor contains fission products and the like. Fission products, etc. decay over time, but continue to emit radiation and heat over a very long period of time, so vitrified products containing fission products, etc. are completely isolated from the human sphere for a long time. Need to be done.

  For this reason, in the current plan, the vitrified body is stored with cooling, especially for several decades after the production of its exothermic heat, and after the calorific value has been sufficiently reduced, the thick carbon It is supposed to be hermetically stored in a cylindrical geological disposal container and buried as an overpack (geological disposal) in a disposal hole drilled in a deep underground several hundred meters deep (see, for example, Patent Document 1). .

  In order to isolate fission products, etc. contained in vitrified materials buried in deep underground rocks from human living areas, prevent contact with vitrified groundwater flowing in the deep underground as much as possible. is important. That is, when the groundwater comes into contact with the vitrified body, the groundwater begins to melt together with the fission products contained in the vitrified body although the groundwater is little by little, and the groundwater remains containing the fission products and the like. This is because there is no denying the possibility of moving underground and reaching the human sphere.

For this reason, during the geological disposal of the vitrified body, the vitrified body is stored and sealed in a carbon steel thick container (overpack) having considerable corrosion resistance under the deep underground environmental conditions where the geological disposal is performed, It is planned to cover the entire surface with a material called cushioning material (a candidate for cushioning material in the current plan is a kind of clay called bentonite). This combination of overpack and cushioning material is called an “artificial barrier”.
JP 2002-122695 A

  However, as described above, even if the vitrified body is housed and confined in the artificial barrier, the vitrified body still generates heat. There is a concern that the corrosion of the pack is promoted and a through hole is formed. Then, since there is a possibility that groundwater may enter into the overpack from this through hole, it cannot be said that the above-mentioned problem of groundwater has been completely solved.

Needless to say, it is more desirable if the confinement of fission products and the like by overpacking can be secured for a longer period of time. That is, even when the temperature rises near the disposal hole for geological disposal, it is desirable that the confinement function by the artificial barrier is maintained for a longer period than the confinement period assumed in the current plan.
In view of the above circumstances, the present invention provides a geological disposal apparatus and a geological disposal method that further enhances confinement performance by preventing corrosion of a geological disposal container that has been disposed and sealed by storing high-level radioactive waste such as vitrified glass The purpose is to provide.

  To achieve the above object, according to the first aspect of the present invention, a geological disposal container mainly comprising a metal container main body for hermetically storing high-level radioactive waste, and covering the entire surface of the geological disposal container. A high-level radioactive waste comprising: a buffer material container; and anticorrosion means for electrochemically preventing corrosion on the surface of the container body by applying a potential difference between the container body and the buffer material container A geological disposal device is provided.

The container body may be an overpack made of carbon steel (Claim 2), and the material of the buffer material container may be bentonite (Claim 3).
Moreover, the said anticorrosion means is good also as what gives the electric potential from which the material of the said container main body becomes an electrochemically stable metal state area | region in a geological disposal environment to the said container main body (Claim 4).
Furthermore, the geological disposal container is provided so as to cover a container main body for storing the high-level radioactive waste and an outer side of the container main body, and heat generated from the radioactive waste is dissipated from the outer surface of the container main body. And a thermoelectric element that generates electricity by a temperature difference between one end positioned on the container body side and the other end exposed to the outside. Providing the thermoelectric element by confining the heat generated from the high-level radioactive waste inside by the heat insulating effect of the covering heat insulating portion to increase the temperature difference between the outer surface of the container body and the outer surface of the covering heat insulating portion. It is good also as supplying the electricity generated efficiently by the said anticorrosion means (Claim 5).

  According to the invention of claim 6, a geological disposal container mainly composed of a metal container main body containing high-level radioactive waste is sealed in a deep underground bedrock together with a buffer container provided so as to cover the entire surface. A feature of applying a predetermined potential difference between the container main body and the buffer material container when storing and installing in the disposed disposal hole, and preventing progress of corrosion on the surface of the container surface main body by an electrochemical reaction, A method for geological disposal of high-level radioactive waste is provided.

  The invention of claim 1 comprises a geological disposal container mainly composed of a metal container main body for hermetically storing a high-level radioactive waste such as vitrified glass and a buffer material container covering the entire surface thereof, the container main body and the buffer material An anticorrosion means for applying an electric potential difference (voltage) between the containers to electrochemically prevent corrosion was provided. For this reason, a potential difference is generated between the container main body and the buffer material container, and the state of the surface of the container main body can be shifted to a state in which corrosion does not proceed by an electrochemical reaction. For this reason, as long as such a potential difference is added, the progress of corrosion can be prevented for a very long period of time.

Cost reduction can be achieved by using an overpack made of carbon steel as the container body (Claim 2).
Furthermore, by using bentonite as the material of the buffer material container, the cost is low and an excellent effect for preventing intrusion of groundwater can be achieved (claim 3).
Further, the “state in which corrosion does not proceed” can be achieved by the anticorrosion means applying to the container body a potential in which the container body material is in an electrochemically stable metal state region in the geological disposal environment (claims). Item 4).

  As means for supplying electricity to the anticorrosion means, it may be possible to receive electricity from the outside. However, heat generated by high-level radioactive waste such as vitrified glass is converted into electric energy and supplied on the spot. It is also possible. That is, according to the invention of claim 5, the entire container main body of the geological disposal container is covered with the covering heat insulating part, and heat generated from the high-level radioactive waste is confined and accumulated inside, and the outer surface of the container main body and the outer side of the covering heat insulating part are stored. The thermoelectric element is inserted through the front and back of the insulation cover, and one end of the thermoelectric element comes into contact with the outer surface of the hot container body, and the other end is covered with insulation. It was exposed to the outside of the unit, and contacted with a low-temperature buffer material container or arranged with a slight gap. For this reason, a large temperature difference occurs between both ends of the thermoelectric element, and the heat dissipated from the outer surface of the container body can be converted into electric energy, so that the electricity can be added to the container body and the buffer material container, respectively. it can. As a result, the heat energy generated from the high-level waste to be disposed of can be used as it is for the cathodic protection of the container, so that it is not necessary without receiving an electric supply from the outside. Therefore, facilities such as electric wires for that purpose are unnecessary. Moreover, since the heat generation of the high-level radioactive waste continues for a very long period of time, it is possible to maintain the confinement function by means of cathodic protection over such a long period.

  Moreover, in invention of Claim 6, it is predetermined | prescribed for electrochemical corrosion protection between the container main body and buffer material container of the geological disposal container in the state which buried the geological disposal container which accommodated the vitrified body in the deep underground. It was decided to apply a potential difference. For this reason, as long as such a potential difference is added, the progress of corrosion can be prevented for a very long period of time.

Embodiments of the present invention will be described with reference to the drawings.
In addition, the geological disposal apparatus 1 of a present Example converts the thermal energy which the glass solid G contained in the geological disposal container 10 generate | occur | produces into an electrical energy, and applies this electricity to the electrochemical protection of the geological disposal container 10 Is.
The geological disposal apparatus 1 according to the first embodiment of the present invention shown in FIG. 1 is a disposal hole H that accommodates a vitrified body (high-level radioactive waste) G and is drilled in a deep underground having a depth of several hundred meters or more. A geological disposal container 10 to be buried and disposed, and a buffer material container 20 disposed so as to cover the entire surface of the geological disposal container 10 at the time of disposal.

The geological disposal container 10 includes an overpack (container body) 11 made of carbon steel that houses the vitrified body G, and a heat insulating portion that covers the periphery of the overpack 11 and blocks heat generated from the vitrified body to prevent the dispersion to the outside. (Coating heat insulating part) 12 and a thermoelectric element 13 or the like that is fitted into a hole 12e formed in the heat insulating part 12 and converts heat energy into electric energy.
The overpack 11 includes an overpack body 11a that is a bottomed thick cylindrical body and a thick disk-shaped lid portion 11b that closes an open end 11d at the top of the overpack body 11a. The shape and size of the space portion 11c inside the overpack body 11a is set to such a size that only the cylindrical vitrified body G can be accommodated. The size of the vitrified body is about 45 cm in diameter and about 1.5 m in height.

  The material of the overpack 11 is not particularly limited, but carbon steel that is relatively excellent in corrosion resistance in a geological disposal environment and that generates uniform corrosion and does not cause pitting corrosion can be suitably used. Further, the thickness of the overpack 11 is not particularly limited, but when the material is carbon steel, the thickness required for geological disposal, specifically, the pressure resistance that can withstand the pressure from the surrounding rock mass, As the thickness set by the gamma ray shielding performance for preventing radiolysis of the surrounding groundwater and the like, it is considered that all of the lid, side surface, and bottom portion should be about 20 cm.

The heat insulating portion 12 includes a bottomed cylindrical heat insulating portion main body 12a and a thick disc-shaped lid portion 12b that closes the open end 12d at the upper portion of the heat insulating portion main body 12a. The space part 12c of the magnitude | size which can accommodate only one is provided. In FIG. 1, the space portion 12 c is described so as to overlap the overpack 11.
The heat insulating portion 12 has a function of blocking heat dissipated from the outer surface of the overpack 11 and confining it inside. For example, a plurality of holes 12e penetrating from the front side to the back side are formed in the heat insulating part 12, and a thermoelectric element 13 described later has one end surface (high temperature surface) 13a outside the overpack 11 in the hole part 12e. It is fitted so that it contacts the surface and the other end surface is exposed to the outside to form a heat radiating surface 13b. In addition, on the upper surface of the heat insulating portion 12, a lid portion 12b that closes the open end 12d of the upper portion of the heat insulating portion 12 after the overpack 11 is stored is installed between the heat insulating portion main body 12a and the lid portion 12b. It has a structure that can be fixed by fitting without generating a gap.

  The material of the heat insulating part 12 is not particularly limited as long as it is a material excellent in heat insulation, heat resistance, strength, long-term stability and water resistance. For example, urethane is used as an organic material, and square is used as an inorganic material. Zirconia ceramics composed of crystals and monoclinic crystals can be suitably used. Moreover, about the thickness, the emitted-heat amount from a vitrified body, the outer surface temperature of the heat insulation part 12 (it restrict | limits to 100 degrees C or less from a viewpoint of protection of the buffer container 20 mentioned later), the heat conductivity of the heat insulation part 12, etc. And considering the balance between the two so that the heat insulation portion 12 becomes too thick and the diameter and height of the entire geological disposal container 10 become too large, resulting in an increase in the drilling amount of the disposal hole. And set.

  Since the thermoelectric element 13 is a known one, a detailed description thereof will be omitted, but one end (high temperature surface) 13a of the thermoelectric element 13 is in contact with the high temperature side heat source and the other end forms a heat radiation surface 13b. The thermal energy and the electrical energy are directly converted using the thermoelectromotive force due to the temperature difference between the high temperature surface 13a and the heat radiating surface 13b. As a result, simple power generation without moving parts, that is, power generation with a small size and a long life can be achieved. At this time, the heat dissipating surface 13b is formed on the same surface as the outer surface of the heat insulating portion 12, and the geological disposal container 10 is installed in the disposal hole H to be described later together with the buffer material container 20 with the heat dissipating surface 13b. The buffer material container 20 is brought into contact with the inner surface.

  Regarding the number and arrangement of the thermoelectric elements 13, considering the temperature distribution inside the geological disposal container 10 due to heat generation from the vitrified body, the calorific value of the vitrified body as the entire geological disposal container 10 is as high as possible to electrical energy. The thermoelectric element 13 is set so that it can be converted with efficiency and the number of thermoelectric elements can be reduced as much as possible, and an appropriate potential difference for electrochemical protection of the overpack 11 is generated by the thermoelectric element 13.

  The high temperature surface 13a and the heat radiating surface 13b of the thermoelectric element 13 also serve as plus (+) and minus (−) electrical output terminals, that is, electrode plates 13c and 13d, respectively. With the outer surface of the pack 11 and the heat radiating surface 13b in contact with the inner surface of the buffer material container 20, heat is transferred between the high temperature surface 13a and the outer surface of the overpack 11 and between the heat radiating surface 13b and the inner surface of the buffer material container 20. A potential difference is applied simultaneously with the transfer, so that a potential difference is generated between the overpack 11 and the buffer material container 20. That is, in this embodiment, the high temperature surface 13a and the heat radiating surface 13b, which also serve as the electrode plate, constitute anticorrosion means.

The buffer material container 20 includes a bottomed cylindrical body 20a and a thick disk-shaped lid 20b that closes an open end 20d on the top of the body 20a. Inside the main body 20a, a space 20c of a size that can accommodate one geological disposal container 10 is provided. In addition, in FIG.1 and FIG.2, the space part 20c overlaps with the geological disposal container 10, and is described.
The buffer material container 20 prevents the groundwater from entering and corroding the overpack 11 for a certain period of time, and the overpack 11 is corroded by the entrance of the groundwater, so that the internal vitrified material is gradually added to the groundwater. Even when it melts, it has a function of trapping radioactive substances contained in the groundwater in the buffer material container 20 by adsorption or filtration.

The material of the buffer material container 20 is difficult to permeate water, and has the property of adsorbing or filtering a fission product or the like dissolved or mixed in the ground water and holding it in the buffer material container 20, and is easy to process and handle. For example, a mixture of bentonite, a kind of clay, with silica sand at a predetermined ratio can be suitably used.
Next, the usage method of this geological disposal apparatus 1 is demonstrated.

As a method of using the geological disposal apparatus 1, in a remote cell or the like away from the geological disposal site, the step of storing the glass solidified body in the geological disposal container 10 and the geological disposal container 10 are transferred to the underground geological disposal site, And a process of burying (geological formation) disposal in the disposal hole H in the geological disposal site. First, the process before transferring the geological disposal container 10 etc. to a disposal hole is demonstrated with reference to FIG.
That is, in a cell (not shown) having a shielding function, the vitrified body G is stored in the space portion 11c in the overpack body 11a by remote control. Thereafter, a lid portion 11b is installed at the open end 11d of the overpack body 11, and the lid portion 11b is remotely welded to the overpack body 11a to seal the space portion 11c. Next, the overpack 11 is housed in the space portion 12c of the heat insulating portion main body 12a by remote control, and the lid portion 12b is fixed to the open end 12d of the heat insulating portion main body 12a by fitting. Since the geological disposal container 10 is completed in this state, the geological disposal container 10 and the buffer material container 20 covering the entire surface at the time of disposal are transferred to the disposal hole H.

  Next, a method for embedding the geological disposal container 10 in the disposal hole H will be described with reference to FIG. FIG. 2 shows a state in which the disposal container 10 containing the glass solid G is buried in the underground disposal hole H. A bottomed cylindrical disposal hole H is drilled in a bedrock having a depth of several hundred meters or more underground, and the main body portion 20a is inserted into the disposal hole H. After the geological disposal container 10 is stored in the space 20c of the main body 20a, the open end 20d of the main body 20a is closed with the lid 20b. Further, the tunnel (not shown) leading to the disposal hole H is backfilled with rock, soil, sand, etc. of the same material as the bentonite or the bedrock, and the disposal is completed. In addition, since the buffer material container 20 containing the geological disposal container 10 is accommodated in the disposal hole H substantially in close contact, the buffer material container 20 and the disposal hole H are overlapped in FIG. ing.

  Next, the operation of the main geological disposal apparatus 1 will be described. In addition, as described above, the geological disposal apparatus 1 converts the heat generated from the vitrified body G into electric energy, and the carbon steel overpack 11 of the geological disposal container 10 by the converted electric energy. It has two actions, that is, the action of performing anti-corrosion. Therefore, first, the action of converting heat energy into electric energy will be described, and then the anticorrosion action by the electricity will be described.

  As shown in FIG. 1, since the geological disposal container 10 of the main geological disposal apparatus 1 is covered with the heat insulating portion 12, the heat generated from the vitrified body G is generated by the heat insulating effect of the heat insulating portion 12. 10 is not diffused into the external buffer material container 20, but is accumulated in the vitrified body G and the overpack 11. For this reason, the temperature inside the overpack 11 rises, and the temperature difference between the outer surface of the overpack 11 and the external buffer material container 20 where the heat of the vitrified body G is not transmitted becomes large. Moreover, since almost all of the heat dissipated from the geological disposal container 10 is concentrated on the high temperature surface 13a of the thermoelectric element 13, the amount of heat per unit area, that is, the thermal energy density is increased. For this reason, the temperature difference between the high temperature surface 13a and the heat radiating surface 13b of the thermoelectric element 13 is large, and the thermal energy density concentrated on the thermoelectric element 13 is also large. The amount of power generation per element 13 and the conversion efficiency can be improved, and sufficient electric energy can be obtained for performing electrochemical corrosion protection of the overpack 11 described later. As another effect that most of the heat energy generated from the vitrified body G is converted into electric energy, the heat generated from the vitrified body G is not transmitted to the buffer material container 20, so that the buffer outside the geological disposal container 10 is buffered. It is possible to appropriately remove heat from the vitrified body without increasing the temperature of the material container 20 or the rock mass outside the material container 20. Since the temperature of the buffer material container 20 or the like does not increase, the corrosion reaction on the outer surface of the overpack 11 is not accelerated by the high temperature.

Next, the electrochemical anticorrosive action by the electric energy generated by converting from the heat energy will be described with reference to FIG.
As described above, the electrode plate (one end of the electrical output terminal) 13c of the thermoelectric element 13 is brought into contact with the overpack 11, and the other electrode plate 13d is brought into contact with the buffer material container 20 so that the overpack 11 and the buffer material container 20 are brought into contact with each other. A potential difference is applied between them. The electrode plates 13c and 13d are respectively aligned with the high temperature surface 13a and the heat radiating surface 13b of the thermoelectric element 13, and the both ends thereof are in contact with the overpack 11 and the buffer material container 20 so that not only heat is transferred but also electricity. Energy is also exchanged.

The electromotive force generated by the temperature difference is adjusted by adjusting the number and arrangement of the thermoelectric elements, and the potential difference is adjusted to be in an appropriate range. As a result, the outer surface of the overpack 11 can form a stable metal state, that is, a state in which corrosion does not proceed.
This will be described in more detail below. In the underground environment under the geological disposal conditions, the pH value is 7 to 8, and the overpack 11 side potential is about −0.5 V with respect to the buffer material container 20. As shown in Fig. 4 ("Introduction to Material Environmental Studies" (edition of corrosion and corrosion prevention), page 19), under the above conditions (around P in the figure), which is a geological disposal environment, the state of carbon steel is generally in the corrosion region. Yes, corrosion proceeds at a slow rate. The overpack 11 side potential is lowered by, for example, about 0.15 V to 0.2 V, and the state is shifted so that the potential becomes −0.65 V to −0.7 V. Then, although the state shifts to a metal region (metal state region) indicated by Q in FIG. 4, corrosion does not proceed because carbon steel exists stably in the metal state in that state. However, this region is also a region where water is decomposed and hydrogen is generated, and if the potential is lowered too much, the generation of hydrogen becomes intense, so it is not preferable to lower the potential more than the above. That is, in FIG. 4, two dotted lines L1 and L2 are shown, but the region sandwiched between the two dotted lines is a stable region of water, and in other regions, a water decomposition reaction occurs. In FIG. 4, oxygen is generated above the dotted line L1 (high potential side), and hydrogen is generated below the dotted line L2 (low potential side), and the generation amount increases as the distance from the dotted lines L1 and L2 increases.

Considering the above, as shown by Q in FIG. 4, the overpack 11 has an outer surface in a metal state, in which corrosion does not proceed, and the potential difference is within a range where hydrogen generation due to water decomposition is small. Therefore, electrochemical corrosion protection can be achieved.
As described above, when a through-hole is generated in the overpack 11 due to corrosion, the groundwater penetrates into the overpack and comes into contact with the vitrified body, gradually dissolving the radioactive material contained in the vitrified body and externally. Risk of leakage. Therefore, it is important to prevent the overpack 11 from being corroded. Usually, however, the corrosion is set by considering the corrosion rate and the service life. However, if the progress of corrosion of the overpack 11 can be prevented by the electrochemical means as described above, since “corrosion does not occur at all as long as the heat generation of the vitrified body continues”, it is “certainly constant”. Needless to say, it is more preferable to predict the amount of corrosion within a period and make the design tolerate the corrosion.

This is the end of the description of the geological disposal apparatus 1, but it goes without saying that there are various other modes in this embodiment. The example of another aspect concerning this is shown below.
In the present embodiment, the overpack 11 is made of carbon steel, but is not limited to this as long as it is a metal material that can be transferred to an electrochemically stable metal state in a geological disposal environment.

In the present embodiment, a plurality of thermoelectric elements are used. However, the number may be one when the thermal energy generated from the vitrified body can be appropriately converted into electric energy and an appropriate potential difference can be applied to the anticorrosion.
In this embodiment, the high temperature surface 13a that contacts the outer surface of the overpack 11 and the heat radiation surface 13b that contacts the buffer material container 20 also serve as an electrode plate that applies a potential difference between the overpack and the buffer material, These high temperature surface 13a, heat radiating surface 13b, and the like constitute anticorrosion means. However, by separately providing an electrode plate and an electric wire to be connected to the electric output terminal of the thermoelectric element, these electrode plates are fixed by being inserted into, for example, small holes formed in the outer surface of the overpack or the inner surface of the buffer material container. A potential difference may be applied.

In the present embodiment, the electricity supply to the anticorrosion means is made by electricity converted from the heat generated from the vitrified body, but it may be supplied from the outside by an electric wire or the like.
In this embodiment, the vitrified body is disposed of by the geological disposal device, but for example, the spent fuel can be disposed directly by the geological disposal device.
In addition, embodiment described here is an example, Comprising: This invention is not limited only to this, It cannot be overemphasized that a change can be added in the range of the summary of this invention.

It is a schematic sectional drawing which shows the structure of the geological disposal apparatus which is an Example of this invention. It is explanatory drawing which shows the state which carried out the geological disposal of the geological disposal container of FIG. It is explanatory drawing of the anti-corrosion action of the overpack by the geological disposal container of FIG. It is the pH-Eh diagram of iron regarding electrochemical corrosion protection.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Geological disposal apparatus 10 Geological disposal container 11 Overpack 12 Heat insulation part (covering heat insulation part)
13 Thermoelectric element 13a High temperature surface 13b Heat dissipation surface 13c, 13d Electrode plate (electrical output terminal)
20 Buffer material container G Vitrified body H Disposal hole

Claims (6)

A geological disposal container mainly composed of a metallic container body for hermetically storing high-level radioactive waste;
A buffer material container disposed to cover the entire surface of the geological disposal container;
A high-level radioactive waste geological disposal apparatus, comprising: anticorrosion means for electrochemically preventing corrosion on the surface of the container body by applying a potential difference between the container body and the buffer material container .   The geological disposal apparatus for high-level radioactive waste according to claim 1, wherein the container body is an overpack made of carbon steel.   The geological disposal apparatus for high-level radioactive waste according to claim 1, wherein the material of the buffer material container is bentonite.   2. The high-level radioactive waste formation according to claim 1, wherein the anticorrosion means gives the container main body a potential at which the material of the container main body becomes an electrochemically stable metal state region in a geological disposal environment. Disposal equipment. The geological disposal container is provided with a metal container main body for storing high-level radioactive waste, and an outer surface of the container main body, and heat generated from the radioactive waste from the outer surface of the container main body. A sheathed insulation that blocks radiation;
A thermoelectric element that is disposed through the front and back of the covering heat insulating part, and that generates electricity by a temperature difference between one end positioned on the container body side and the other end exposed to the outside;
Efficiency is improved by the thermoelectric element by confining the heat generated from the high-level radioactive waste inside by the heat insulating effect of the covering heat insulating part and increasing the temperature difference between the outer surface of the container body and the outer surface of the covering heat insulating part. The geological disposal apparatus for high-level radioactive waste according to claim 1, wherein electricity generated well is supplied to the anticorrosion means. A geological disposal container consisting mainly of a metal container that contains high-level radioactive waste in a sealed manner, together with a buffer material container that covers the entire surface, is stored and installed in a disposal hole drilled in a deep underground rock. On the occasion
A method for geological disposal of high-level radioactive waste, wherein a predetermined potential difference is applied between the container body and the buffer material container, and the progress of corrosion on the surface of the container surface body is prevented by an electrochemical reaction. .

Images