EP1999759A2

EP1999759A2 - Method and apparatus for final storage and safe operation of nuclear power stations

Info

Publication number: EP1999759A2
Application number: EP07723561A
Authority: EP
Inventors: Werner Foppe
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-03-24
Filing date: 2007-03-23
Publication date: 2008-12-10
Anticipated expiration: 2027-03-23
Also published as: EP1999759B1; DE102006013836A1; WO2007110211A3; US8693609B2; WO2007110211A2; ATE479190T1; DE502007004859D1; US20090145659A1

Abstract

The creation of a final geological repository in the base region of super-deep bore shaft (10) by magnetically glided, directional melt drilling with cast metal encapsulation (2) for disposing highly radioactive waste material, includes subcritically disposing highly-radioactive material into the borehole shaft. The borehole shaft separates itself from the rest of the shaft after filling by producing the residual heat of the material and/or geo-pressure and/or the self-weight under gravity and/or the molten rock formation from the hot deep-seated rock migrates towards the geocentre. The creation of a final geological repository in the base region of super-deep bore shaft (10) by magnetically glided, directional melt drilling with cast metal encapsulation (2) for disposing highly radioactive waste material, includes subcritically disposing highly-radioactive material into the borehole shaft. The borehole shaft separates itself from the rest of the shaft after filling by producing the residual heat of the material and/or geo-pressure and/or the self-weight under gravity and/or the molten rock formation from the hot deep-seated rock migrates towards the geocentre. The metal encapsulation is a lower cone-shaped shaft segment, which is intended to final repository and whose wall thickness increases downwards from the top. The lateral pressure forces of the deep-seated rock cumulate themselves on the metal encapsulation of the separated cone-shaped final repository segment to downwardly directed pressure forces on the tip of the segment. The super-deep drilling shafts are bored for final disposal of wastes through self-propelled sinking directly at the nuclear power plants, intermediate storage sites and other nuclear-technology based plants. Ingot molds and nuclear fuel rods are stacked one above the other with heat-conducting intermediate spacers to be safely disposed in pressure-resistant carrier units in the borehole shaft by a magnetically-driven gliding system. Liquid lead is filled into the free spaces between the stored materials for reducing the frictional load of the carriers and serves as a heat transfer fluid and moderator for fast neutrons for increasing the heat production. A filled up drill hole section is intended to be closed with a pressure-tight lid (5). The produced residual heat from the subterraneously stored, highly radioactive material leads to an evenly distributed heating in the metal encapsulation of the shaft segment on account of the convection of heat transfer medium (9). The cast metal encapsulation of the borehole shaft above the pressure-tight closed, lower borehole segment is melted over a suitable length to form molten metal by a directional melt drilling method using a magnetically driven gliding vehicle and is separated from the rest of the shaft. The molten metal serves as additional pressure sealing of repository segment (6). On the account of the residual heat production, the own heat of the deep-seated rocks, lateral pressure of the rocks and effect of gravity on the separated final repository segment with a 2 to 3-fold higher mass density than the surrounding rock, a partial melt formation results between the surrounding geological strata and the metal encapsulation of the final repository segment. The formed partial melts act as a guided gliding system between the hot deep-seated rocks and the metal encapsulation and exhibit an accelerated migration towards the geo-center as a consequence of lateral geological pressure effect of gravity on the separated final repository segment. The formation of partial melts is intensified under the supercritical conditions of the fluid in hot deep-seated rocks by the injection of the liquid lead or weak-radioactive into the region of the final repository segment. The liquid lead dissolved in the partial melt follows or overtakes the hot final repository segment during its migration into hotter regions of the center of the earth. The melted-up drill shaft region is filled up with a suitable material. The rest portion of the drill shaft is provided with a suitable metal melt shaft segment tip. The filling of further final repository segments is restarted for a self-propelled sinking prevails. Not only the final disposal of the highly radioactive stock of a nuclear power plant but also its dismantling with direct disposal of the resulting material has to be accomplished at the same site of the super-deep drilling shaft borehole shaft, in such a manner that a bomb-proof connection has to be built from the reactor building and/or reactor, and/or intermediate storage sites to the final repository shaft acting as the disposal site, hermetically separated from the biosphere. The free spaces between the disposed medium and weak-radioactive material is filled with a material, by means of which a corrosion of the final repository segment from the inside is hindered. The top region of the super-deep borehole shaft is filled up in an air and watertight manner. A tunnel that is lined with carbon panels runs from the reactor to a deep-lying basin, which is occupied by high active waste carbon ingot molds with overflow devices and which lies in the decay region of the reactor or the intermediate storage site, so that in the event of a reactor melt, the highly-radioactive melt runs into the ingot molds and has to be disposed by the automated transport system of the final repository device, directly into the medium-filled final repository segment. An independent claim is included for a device for creating a final geological repository in the base region of super-deep bore shafts by magnetically glided, directional melt drilling.

Description

Process and device for the disposal and safe operation of nuclear power plants

The invention relates to a method for creating a secure repository in a well bore created by melt drilling, which has a solidified melt borehole casing, in particular a metallic Borlochverschalung. The invention further relates to a device for creating secure repository comprising at least one wellbore with a Borlochverschalung, in particular a metal casing of a cast. The invention is intended in particular for the disposal of highly radioactive and / or highly toxic material, but is also suitable for the storage of any other materials.

The invention also relates to devices as a safe and cost-effective repository for low and medium-active materials a bomb-proof connection and transport system between reactor or intermediate storage and repository shaft. The invention also relates to devices for the controlled control of a reactor Gaus with meltdown and automated direct disposal of the leaked meltdown.

The sinking of well shafts, in particular so-called super deep well wells with consistently large borehole diameters up to Drilling target and in particular at depths up to 20 km or even more is known, for example, from the publication EP 1 157 187 B1 of the same Applicant, the content of which is fully incorporated herein by reference. The method described here can preferably be used to create a wellbore by melt drilling and thereby to provide the wellbore with a seamless Borlochverschalung, in particular made of metal.

For a particular pure molten metal, a metal or a metal mixture is supplied as a drilling medium through conduit elements to be removed by melting borehole bottom, the spoil melt pressed into the particular torn by temperature and pressure environmental rocks and created during drilling by solidifying molten metal a Metalllochlochverschalung ,

For this purpose, the particular pure molten metal emerging from the lowermost conduit element of the metal melting drill rig above the borehole bottom can be guided between the outside of the molten metal boring plant, in particular its lowest conduit element and the borehole inner wall, and solidify there. As drilling progresses, more conduit elements can be attached to the previous element to continuously drill the hole. As line elements, especially in the hot area, such graphite can be used. It can be provided that line elements, in particular in the upper cooled area can work as a magnetic slider, in particular controlled on the metal Borlochverschalung, slide along and preferably both holding forces horizontal and shear forces can exert downward and upward.

The introduction of melted holes is preferably carried out by this known method, but it can also be used other methods, if this suitable to create a borehole casing, in particular from a cast.

The safe disposal of highly radioactive substances is a socially serious problem that is still unsolved worldwide. So far, there is no safe disposal concept in any country, even though hundreds of billions of euros have been spent on finding and testing suitable repository locations worldwide. After 50 years, the nuclear energy community, with its scientific and economic potential, has never been able to provide a safe repository, even though the unresolved repository problem has the strongest impact on the decline in nuclear energy market share in world energy production, in addition to the irrefutable nuclear risk.

According to current disposal concepts and methods for the dismantling of nuclear power plants and nuclear facilities their disassembly and disposal of the resulting contaminated material is more expensive than the construction of the plants themselves, so that the search for the 'best possible repository' a high potential savings while increasing security should bring.

Irresponsible procedural proposals such as sinking in deep-sea trenches or shooting to the moon or into space are already prohibited for security reasons and are not up for discussion.

Almost every country with nuclear technology is in the process of developing or building its own repository concepts and devices. The US is working on a repository in the tuff of the Jucca Mountains not far from Las Vegas. Canada, Sweden, Switzerland and others explore hard rock (crystalline) as a repository.

The German repository concept is tailored to salt as a host rock, at least until the beginning of the current moratorium for the Gorleben salt dome, which runs until 2010 at the latest and is to be used to search for a'best possible repository 'in different host rocks.

The objective is to have a ready-to-use repository by 2030, whereby it is assumed that all nuclear waste generated by 2080 will be housed in a repository after the decision to phase out the nuclear power plant.

Common to all concepts in the various countries is the approach of a mine-like tunnel system as a central warehouse with large capacity at depths of up to 1000 m depth, which thus remains in the area of the biosphere. There is a danger that groundwater, surface waters and deep waters can penetrate over long periods after tectonic changes and pollute the biosphere. In Germany, there is widespread agreement among those responsible that both the .Gorleben salt dome and the Erzbergwerk Konrad mine at Salzgitter are considered to be the ultimate repository for low- and medium-radioactive material, which, at an estimated 280,000 m ^3, also accounts for 90% of the final disposal radioactive material until 2080, if it remains at the agreed exit.

The search for the'best possible repository 'in Germany, especially for highly radioactive substances, thus remains a top priority on the agenda and can also become a multi-billion megamarket for the German economy.

The decisive factor for the option of a central repository is the high exploration and construction costs for the shaft construction and the underground tunnels and caverns, since the development costs would therefore have to be made only once. At the same time, according to the current disposal concepts, suitable sites are few and far between.

The risks of transporting and reloading from the transport containers in the repository as well as the high transport costs and the resistance of the population to the transports and to the central location speak against a central repository, because nobody wants to have the long-lived and potentially lethal waste from others in their area.

In the International Agreement on Final Disposal, signed on 1 October 1997, all 42 signatory states agree that the disposal of high-activity, long-lived nuclear energy products outside the biosphere must be safely carried out in deep geological formations along the shortest possible transport routes.

Known methods for the disposal of highly radioactive material in pressure-resistant devices by lowering into the Earth's interior make use of the subduction zone, where the deposited material with the subducting plate disappears in the earth's mantle over millions of years. A possibility of final disposal in subduction zones to be realized with a given technique was only given there, as described, for example, in US Pat. No. 5,022,788, where the subduction zone is close to the surface and can be reached from the continental crust through well bores or tunnels in order to store appreciable quantities can. The disposal of radioactive material enclosed in pressure-resistant and heat-resistant containers is technically not possible with conventional drilling technology (KTB) and shaft construction down to a depth with viscous plutonic rock, as postulated in DE 195 28 496 C1. The named Continental Deep Well (KTB) in the Upper Palatinate reached its technical and mineral-geological end at 300 ⁰ C rock temperature at 9000 m depth. From 300 ⁰ C and especially in the presence of water, the stability of the rock decreases so much that under the pressure of the side rock breaks the exposed, unverschalte borehole or shaft area from the side. (GEOSCIENCES Year 13, April 1995, pages 151-153)

The invention has for its object to overcome these disadvantages and to meet the demand for a .bestmöglichen repository ¹ . The invention is further based on the object to provide a method and a device that provide a safe and cost-effective disposal directly on site and are equally usable in all countries and in particular also still offer the possibility in the case of blowing through a reactor, the reactor structure so to control, without a burden on the environment occurs.

This object is achieved by a method in which endzulagerndes, especially subcritical hochradioaktivives material is deposited in a lower portion of the interconnected wellbore, this lower area is separated after filling from the rest of shaft and this lower area migrates automatically towards the center of the earth.

The object is further achieved in that in a repository at least one lower hole section (1/7) of a interconnected well after separation of repository material, especially in the subcritical state, is separated / separated from the rest of the wellbore to self-heat generation and / or rock pressure and / or self-weight under gravity and / or molten rock formation to sink towards the center of the earth.

As mentioned at the beginning, the molten metal drilling method according to EP 1 157 187 B1 offers a technically feasible drilling method with which, in a continuous melt-drilling process, production-ready superfinishes can be produced quickly and inexpensively. Deep wells with a large, well-defined drill hole diameter can be created to depths of 20 km or more. In the continuous propulsion of the melt drilling rig, in particular by magnetic glides, a seamless die-cast well casing is simultaneously created from acting as a drilling medium molten metal, which serves the magnetic slider as .Reaktionsschiene 'and driving tube. These die-casting interconnect wellbores, they are produced by this or another method, are used according to the invention as a repository.

In the case of the continuous molten metal drilling process, there is at no time an exposed, non-drilled wellbore area, since a thick-walled metal casing is built up directly from the molten metal, which also serves as the drilling head. The stability of such a interconnected borehole or well depends on the thickness of the metal wall, the prevailing pressure difference between the inner and outer walls and in particular the prevailing temperature. Such a metal-mixed borehole can remain stable up to a maximum rock temperature of 600 ^c C - 700 ⁰ C, so that depths of 20 km can be expected in the continental crust. But even under these temperature and pressure conditions, the plutonic rock is not in viscous form but in solid, if ductile form.

Preferably, the hole is created to a depth in which the rock is present in ductile form and in particular already form partial melts whose formation is further enhanced by the self-heat generation of the stored, heat-producing highly radioactive material or in particular under the predetermined temperature and pressure conditions in the hot deep rock, the rock crystals move against a free, solid and especially heavy metal body, on which the gravity of the earth acts stronger than on the surrounding, lighter surrounding rock. Thus, this can advantageously an accelerated emigration of a separated lower wellbore section, which serves as a repository segment effect.

Favored the emigration speed of the entire separated lower wellbin section / repository segment is preferred, when the outer contour is designed to be conically widened downwards, whereby the enormous lateral pressure forces to vertical thrust force. This erfindungemäße emigration of the repository segment in the form of a heavy metal body can additionally experience an acceleration by friction reduction due to the increased internal temperature by means of radioactive residual heat generation and / or by a fluid accumulation in the boundary region metal shroud / plutonic rock, especially since these fluids under the prevailing temperature and pressure conditions can be supercritical and therefore their friction value drastically reduced.

Advantageously, a repository segment under its gravity, surrounded by the fluid or wetted by a fluid film accelerated to the earth's center to slide, especially in comparison as a glacier slides on his film of water to the valley.

According to the invention, in the lower borehole shaft section, or in particular the highly radioactive material deposited in the shaft deepest, can be filled with a medium, for example with liquid lead as moderator and / or heat and / or pressure compensation medium, or the material to be end loaded can be filled.

A bottommost well section filled in this way can be used as a repository segment according to the invention above the filling of the remaining well shaft by melting down the well casing, in particular the metal casing, e.g. be separated in a range of a few meters and migrates as a whole from the hot plutonic rock in the direction of the center of the earth, especially under self-heat generation and high weight.

The method and the device will be explained in more detail with reference to the single drawing.

According to the invention it can be provided that in the immediate vicinity of nuclear power plants or intermediate storage at least one wellbore, for example, a 20 km deep wellbore (10) is drilled by the described molten metal drilling method.

An upper, larger section, for example more than three quarters of the borehole shaft thus created, in particular with a diameter that is constant throughout, for example of preferably more than 0.5 meters, is provided with a borehole casing, In particular, thick-walled metal casing of a cast and preferably good magnetic permeability provided, and can be used according to the invention as a repository shaft to bring material to be stored in a lower, smaller section, for example, less than a quarter of the wellbore.

Here, the lower wellbore portion, particularly the lower quarter or less than a final disposal segment (1) e.g. be used for high-level radioactive and / or heat-generating materials or other material. This wellbore section may preferably be arranged in a ductile rock region or in the region of supercritical fluid conditions.

There may also be an overlying portion of the wellbore as a repository for other material, e.g. for low and medium radioactive material, e.g. incurred during the dismantling of a nuclear power plant or other nuclear installation.

Preferably, the lower section used as the repository segment (1) in the production of the wellbore (10) in the region of the cast metal casing can be designed such that the wall thickness in the lower region is greater than in the upper region, for example starting at 0.25 m and above 0.05 m ends.

The repository segment (1) can be separated according to the invention as a whole after filling with endzulagernden material and / or segmentally from the rest of the wellbore, the separation of the respective segment of the remaining well can advantageously be done by melting a shaft wall region (4), in particular by radiation energy, which can advantageously come from a laser or a graphite emitter, which can be driven up and down via a magnetic glide device (14) in the wellbore.

The separation according to the invention by melting a wellbill section directly above the final storage, eg filled with highly radioactive material and preferably with example liquid lead encapsulated Endlagersegments (1) can be preferably carried out so that at the same time for safe closure of the separated Endlagersegments (1) by the resulting molten metal, which are above the Endlagersegmentes settles and can form a metal lid closure (5) and / or floats directly on the liquid lead and forms a solid metal closure with the remainder of the Endlagersegmentverschalung.

The remaining shuttering-free Abschmelzbereich (4) in the well can if necessary. Up to a residual area for a new shaft segment tip (3) with a material (eg Borax) are filled, which promotes the self-burial by emigration from the hot storage rock.

According to the invention, the residual well which is open after separation can be closed with a cast metal filling which serves as a new well segment tip (3) and which is preferred, e.g. reinforced by alloying elements, ensures the self-subsidence process.

The disposal device according to the invention preferably comprises a system (12) safely closed to the biosphere, e.g. a transport tunnel, which connects the final storage shaft (10) to the reactor and / or intermediate storage by a, in particular automated transport device, such as a magnetic slider system.

The invention preferably bombproof, hermetically sealed to the outside transport tunnel (12) between the reactor and repository shaft preferably also allows the construction of a collecting and disposal facility in the case of a reactor melt (13), which greatly reduces the residual risk in the operation of nuclear power plants and significantly longer periods of Nuclear power plants allowed, whereby conveniently the 'golden end' of the production time is extended.

The collecting and disposal device (13) according to the invention for the case of a reactor melt can be immediately included in reactor new buildings and thus be optimally designed. In existing nuclear power plants, which are not provided with a bottom protection from graphite cast iron, a withdrawal tunnel can be built below the reactor foundation preferably, which is preferably occupied with graphite crucible and an emerging reactor melt unerringly into a deeper collecting device (15) passes, which preferably also with graphite crucible can be lined and if necessary, in addition with special crucible made of graphite so is designed so that the inflowing reactor melt can be distributed in the available graphite crucible and can be promoted after a cooldown on the automated transport system to the repository.

The collecting and disposal device according to the invention for the case of a reactor melt (13) can be filled with a medium which is as inert as possible against radioactive radiation, heavier than air and lighter than the reactor melt. Thus, the radiation of the collecting and disposal device (13) is preferably limited, wherein the medium can be pumped out after final storage of the reactor melt and also be stored.

The advantages of the repository method according to the invention with a direct repository device on site at the site of nuclear installations by means of well shafts after the molten metal drilling method, compared with known methods and with respect to a central repository, are the following:

1. The deposition and use of cost-effective repository shafts for particularly highly radioactive materials directly at the place of completion and / or storage saves high exploration costs in the search and testing of suitable locations and saves precious time, since any existing site with nuclear facilities for the o. Repository method according to the invention is suitable per se and reaches the end to be stored material in safe depths outside any influence to the biosphere.

2. The nuclear waste tourism with highly radioactive material against the resistance of the citizens has an end or can be limited to marginal areas, reduces the radiation exposure, the accident risk and disposal costs for the population considerably.

3. Safe disposal of highly radioactive fuel elements to the highly radioactive inventory of nuclear power plants on site by self-sinking via boreholes of eg 15 - 20 km depth in historically manageable periods, under hermetic conclusion to the biosphere and with high cost reduction through fully automated processes with shorter cooldowns, convinced operator and affected population. 4. With the creation of repositories at the main nuclear power plant sites, their overall costs are significantly lower than for a central repository solution. At the same time, 'burden-sharing' reduces the distribution of the problem to several locations, reducing the resistance of the affected population, especially since it only affects the population at the nuclear installation sites, which has already come to terms with nuclear power and its risk and burden more nuclear waste shipments are significantly reduced.

5. The combination of direct disposal on-site with an integrated device for controlling a reactor house allows a considerable extension of the reactor life and increases the acceptance of the final disposal concept according to the invention in power plant operators, politicians and affected local population.

6. On-the-ground disposal does not only reduce the risk and transport burden on nuclear facilities in the area, but also creates jobs in the long-term up to the complete dismantling of the nuclear facility with the construction of the repository in the region. At the same time, tax revenues increase and are secured in the long term.

7. The acceptance of the population with nuclear facilities for repository sites suburb is achieved in particular by the Selbstversenkung of highly radioactive material never return to the Earth, as neither the region nor the next generation will leave an incalculable "evil legacy", but on the contrary also by the generation the burden of disposal, which also enjoys the benefits of nuclear energy.

8. The overall societal benefits of final disposal by submerged nuclear power plants via SuperTief drilling and the associated development of the molten metal drilling process to operational maturity are greatly exceeded by the creation of a completely new multi-trillion market the new basic technology molten metal drilling method, of which the safe disposal is only one of the applications.

9. In addition to the greatest possible safety, the time and cost factor are important arguments for final disposal on the ground: The costs for a 20 km deep well with a capacity of one m ³ / m are estimated at about € 200 million. The pure drilling time with the continuous molten metal drilling process amounts to about half a year, so that the rest of the year remains for transport to and from the plant, so that a 20 km well can be produced ready for production per year with a drilling rig. For example, 5 x 1000 m repository segments with a repository volume of about 5000 m ³ can be used per deep well. With 24,000 m ^{3 of} highly radioactive, heat-generating waste for the currently existing nuclear power plants in Germany, 5 repositories according to the invention would be necessary with a total investment of € 1 billion. This amount has already been invested in the construction of the Gorleben and Schacht Konrad sites, which are unsuitable as repositories, and must be reinvested at this level before they can be used as repositories for low and intermediate level radioactive materials.

10. The costs for the search, testing and construction of a new central warehouse to solve Germany's repository problem is based on current experience at least twice as expensive as the disposal solution according to the invention locally, the cost of transport and cost savings in dismantling of the nuclear power plant are not included , For the construction time scenario, a similar picture emerges. Including the technical development of magnetic levellers, metal melt - drilling rigs for technical operational readiness, a completion of 5 repository shafts up to 2020 can be expected for the repository according to the invention. The completion of a central repository after conventional mining construction probably not before 2030. Legend:

1. lower borehole section, repository segment

2. cast iron cone

3. Tip of the lower borehole section (possibly reinforced with alloying elements)

4. Abschmelzbereich for separating the lower well shaft section from the residual shaft

5. Metal lid closure

6. molten metal closure from the molten metal in the melting zone (4)

7. Separated lower well section / repository segment

8. Repository material (e.g., high level radioactive / heat evolving) / fuel assembly

9. Moderator and / or heat transport medium (e.g., liquid lead)

10. Wellbore

12. Transport tunnels (for example, connecting tunnel reactor interim storage repository)

13. Collection and disposal facility for the case of a reactor melt

14. Magnetic slider device for automated transport

15. Collecting device for reactor melt

16. Graphite special crucible for collecting the reactor melt for later, automated removal to the repository

17. Nuclear Power Plant Reactor

18th nuclear power plant

19. Interim storage

20. Repository shaft dome

Claims

claims

A method of providing a repository in a wellbore, in particular by a molten metal drilling method, comprising a cast metal casing continuously formed from the molten metal medium, characterized in that a highly radioactive material (8) to be stored, in particular subcritical, is deposited in a lower region of the wellbore shaft (1), this lower region (7) is separated after filling from the remaining shaft (10) and this lower region (7) automatically migrates towards the center of the earth.

2. The method according to claim 1, characterized in that by residual heat generation of the highly radioactive material emigration is supported.

3. The method according to any one of the preceding claims, characterized in that the wellbill is placed in such a depth, in particular more than 10 kilometers, that the mountain pressure and / or the dead weight under gravity and / or a molten rock formation from the hot plutonic rock emigration supported.

4. The method according to any one of the preceding claims, characterized in that the wall thickness of the particular metallic well casing (2) at least one intended as a repository lower well shaft section (1/7) is performed such that it increases from top to bottom, in particular so that itself a bottom-up substantially conically tapering lower well shaft section results.

5. The method according to any one of the preceding claims, characterized in that the lateral pressure forces of the plutonic rock on the mantle, in particular metal casing of a separated lower wellbore section (1/7) cumulate to downward pressure forces on the tip (3) of the separated wellbore section.

6. The method according to any one of the preceding claims, characterized in that at least one wellbore for final disposal by self-lowering directly on site at nuclear power plants (18) and / or intermediate storage (19) and / or other nuclear facilities is created.

7. The method according to any one of the preceding claims, characterized in that endzulagerndes material (8), in particular spent fuel or other highly radioactive material, without contact with the biosphere directly, in particular via a magnetic glide system, is deposited in each well deepest.

8. The method according to any one of the preceding claims, characterized in that endzulagerndes material, in particular molds and fuel rods in pressure-resistant carrier units in the lower region of the wellbore, in particular by heat exchanging spacers are stacked.

9. The method according to any one of the preceding claims, characterized in that a medium, in particular liquid lead, in the free spaces (9) between the stored material, in particular for relieving the support units by buoyancy and / or as a heat carrier and / or moderator for fast neutrons Increase in heat production, is filled.

10. The method according to any one of the preceding claims, characterized in that a filled lower wellbore section, in particular by a pressure-resistant lid (5) is closed.

11. The method according to any one of the preceding claims, characterized in that above the closed lower borehole section, the borehole casing, in particular cast metal casing of the wellbore (4) is melted and so the lower wellbore section is separated from the remainder of the shaft, in particular over a suitable length by means of a heat source to a magnetic slider - Melting device.

12. The method according to claim 11, characterized in that the melting of the borehole casing resulting molten metal forms a particular pressure-resistant closure of the lower wellbore section (6).

13. The method according to any one of the preceding claims, characterized in that the residual heat produced from the stored, in particular highly radioactive material by convection of the heat transfer medium (9) is used for uniform heating in the metal shell of the lower wellbore section.

14. The method according to any one of the preceding claims, characterized in that it under residual heat production, self-heat of the plutonic rock, side pressure of the mountains and gravity on the separated lower wellbore section (7/1), in particular with a multiple higher mass density than the surrounding rock, to partial melt between Surrounding rock and mantle of the lower well shaft section (2) comes.

15. The method according to claim 14, characterized in that the partial melts formed act as slideway between hot depth rock and mantle of Endlagerabschnitts (1/7)) and under side pressure of the mountains and / or gravity on the separated lower well shaft section an accelerated emigration towards the Earth's interior have as a consequence.

16. The method according to any one of the preceding claims, characterized in that the injection of a fluid, in particular a medium or weak radioactive liquid, in the region of the lower wellbore section - in particular over the metal casing before filling with hochradioaktivem material - the formation of partial melts is enhanced, in particular under supercritical conditions of the fluid in the hot plutonic rock.

17. The method according to any one of the preceding claims, characterized in that the dissolved in the partial melt fluids the hot lower Follow borehole section in the emigration to hotter regions of the earth's interior, and / or lead, in particular, whereby the safe disposal of the pressed fluids secured and the emigration is additionally accelerated.

18. The method according to any one of the preceding claims, characterized in that the residual well is provided with a shaft segment tip (3), in particular made of molten metal, in particular high-strength metal, and the process for filling further lower well shaft sections is repeated, in particular as long as the conditions for a self-sinking are given.

19. The method according to any one of the preceding claims, characterized in that in the lower part of the remaining residual shaft medium and weakly radioactive material is deposited and the remaining shaft to the biosphere is securely closed, especially if the conditions for self-subsidence of a lower well section are no longer given.

20. The method according to any one of the preceding claims, characterized in that not only the final disposal of highly radioactive inventory of a nuclear power plant (18), but also its disassembly is carried out with direct disposal of the accumulating material on site in one and the same wellbore, in particular, such in that an in particular bomb-proof connection (12) is created by the reactor building and / or reactor, and / or temporary storage to the wellbore, hermetically separated from the biosphere.

21. The method according to any one of the preceding claims, characterized in that the free spaces between the deposited medium and weak radioactive material are filled with such a material that corrosion of the repository segment is prevented from the inside.

22. The method according to any one of the preceding claims, characterized in that the upper, especially not with medium and weak radioactive Material loaded area of the wellbore manhole is filled air and water tight.

23. The method according to any one of the preceding claims, characterized in that when changing spent nuclear fuel elements, in particular fully automated and after a short or no intercooling, the spent fuel, in particular with a magnetic slider directly in the cooling medium (9) of the lower wellbin section are deposited, in particular so that the use higher residual heat of the spent fuel for faster self-sinking a lower well shaft section.

24. The method according to any one of the preceding claims, characterized in that the reactor (17) to a low-lying basin (15), in particular by graphite molds with overflow devices (16) is occupied and in the decay area of the reactor or intermediate storage, a tunnel (21 ), in particular lined with graphite plates, in particular so that in the case of a reactor melt, the highly radioactive melt runs into the tank, in particular via an automated transport system, the reactor melt is sold directly into a lower well shaft section as a repository.

25. A device for creating secure repository comprising at least one wellbore with a Borlochverschalung, in particular a metal casing of a cast, characterized in that at least one lower well shaft section (1/7) after filling of repository material, especially in the subcritical state, separated from the rest of the wellbore / is separated to sink by self-heat generation and / or rock pressure and / or own weight under gravity and / or molten rock formation in the direction of the center of the earth.

26. The apparatus according to claim 25, characterized in that the borehole casing (2) used as a repository lower wellbore section (10), in particular with a consistently large Inner diameter, outside at least substantially forms a conical shape, in which the wall thickness of the casing decreases from bottom to top.

27. Device according to one of claims 25 to 26, characterized in that act on the mantle of the separated, conical lower well shaft section, the horizontal compressive stresses of the plutonic rock as a vertical propulsion force at the top of the lower well shaft section.

28. Device according to one of claims 25 to 27, characterized in that at least one loaded with radioactive material lower wellbore section in the open spaces with a medium, in particular liquid lead (9), can be filled.

29. The device according to claim 28, characterized in that in the free spaces between the stored highly radioactive material filled medium, in particular liquid lead, is used to its weight relief by buoyancy and / or as a moderator and heat exchanger.

30. The apparatus of claim 28 or 29, characterized in that the jacket of the wellbore shaft section to be sunk by the medium convection is uniformly heated.

31. Device according to one of claims 25 to 30, characterized in that it is used for final disposal by self-lowering directly on site at nuclear power plants, interim storage facilities and other nuclear facilities / used.

32. Device according to one of claims 25 to 31, characterized in that a filled lower borehole section with a pressure lock (5/6) is providable.

33. Device according to one of claims 25 to 32, characterized in that above a filled with in particular highly radioactive and / or highly toxic material and filled with a medium, in particular liquid lead hole section Bohrschachtverschalung, in particular by a magnetic slider-melting device, can be fused and the resulting melt is used as a more stable pressure seal for the so separated from the wellbore, lower well shaft section.

34. Device according to one of claims 25 to 33, characterized in that the separated, serving as a repository bottom

Borehole shaft section (1/7) with residual heat production of the stored, in particular radioactive material (8) and / or the intrinsic heat of the deep rock and / or horizontal compressive stress of the mountains and / or the partial melt formation in the contact area deep rock / mantle and the gravitational effect in the direction of Erdmittelpunkt emigrated.

35. Device according to one of claims 25 to 35, characterized in that after self-subsidence one or more lower well shaft sections of the then downwardly open residual shaft with a molten metal filling in the wellbore deepest is closable and then usable for disposal for medium and low radioactive material, so, that after filling to areas with safe distance to groundwater leading layers, the free part of the remaining shaft can be filled with an air- and waterproof material.

36. Device according to one of claims 25 to 35, characterized in that the hermetically shielded from the outside world transport tunnel (12) of a nuclear facility to repository wellhead, in particular with its magnetic glide transport units, after the term of the nuclear facility for direct disposal the entire contaminated disassembly material is usable.