EP4156206A1 - Zerlegungssystem für kerntechnische anlage - Google Patents

Zerlegungssystem für kerntechnische anlage Download PDF

Info

Publication number
EP4156206A1
EP4156206A1 EP22196886.0A EP22196886A EP4156206A1 EP 4156206 A1 EP4156206 A1 EP 4156206A1 EP 22196886 A EP22196886 A EP 22196886A EP 4156206 A1 EP4156206 A1 EP 4156206A1
Authority
EP
European Patent Office
Prior art keywords
mast
module
guide
fixed part
modules
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22196886.0A
Other languages
English (en)
French (fr)
Inventor
Xavier Lefebvre
Jérôme MARIN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Graphitech
Original Assignee
Graphitech
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Graphitech filed Critical Graphitech
Publication of EP4156206A1 publication Critical patent/EP4156206A1/de
Pending legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/28—Treating solids
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21D—NUCLEAR POWER PLANT
    • G21D1/00—Details of nuclear power plant
    • G21D1/003—Nuclear facilities decommissioning arrangements

Definitions

  • the present invention relates to a dismantling system for a nuclear installation.
  • Nuclear facilities generally have a sealed enclosure, in which there is radioactive material, such as fuel rods or irradiated materials.
  • Such a mast generally comprises a framework formed by a tubular assembly.
  • This frame is either one-piece or formed from several sections assembled together, for example by bolting.
  • such a mast has a complex framework, which is particularly disadvantageous in a nuclear environment. Indeed, during the dismantling operations, a large quantity of radioactive particles, such as dust for example, can be deposited on the tubes of the framework. When the mast has to be taken out of the sealed enclosure, its decontamination is then particularly long, complex and potentially incomplete. In addition, due to the open structure of such a frame, the mast does not protect against ionizing radiation, which can then easily pass through the opening made in the enclosure and expose a worker located outside the 'pregnant. Such a mast is therefore not suitable for an environment exposed to radioactivity.
  • a tubular assembly is not a symmetrical structure, and generally has a preferential direction for the recovery of the forces exerted there.
  • a mast is not suitable for working in all directions, which consequently reduces the field of action of the tool attached to it.
  • the document GB 2 176 924 A describes a dismantling system comprising a mast formed of modules assembled together, forming a guide for a tool, which is movable along the mast.
  • the structure of the modules adapted to allow the movement of the tool along the mast, makes the cleaning of the mast particularly complex and tedious, which makes the dismantling system unsuitable for an environment exposed to radioactive particles.
  • the invention more particularly intends to remedy by proposing a nuclear installation dismantling system that is more suitable for managing the problems of irradiation and contamination, while being more resistant.
  • the invention relates to a dismantling system for a nuclear installation, comprising a fixed part, configured to be connected to the nuclear installation; a mast carried by the fixed part and extending along a vertical axis from the fixed part downwards, the mast comprising at least two modules assembled together and juxtaposed along the vertical axis; a handling system configured to lower and raise the mast relative to the fixed part, along the vertical axis; and a tool.
  • each module of the mast is a straight cylinder section comprising a solid and sealed cylindrical wall, and defining an interior volume, the respective interior volumes of the modules jointly forming a sealed interior volume of the mast.
  • the tool is permanently carried by the lowest module of the mast.
  • the solid cylindrical walls of the modules make the mast particularly easy to clean when it is polluted by radioactive particles and make it possible to block ionizing radiation, and the cylindrical geometry of the modules allows the mast to be more resistant and suitable for working in all directions.
  • a dismantling system 1 comprising a fixed part 2, a mast 4, a handling system 6 and a tool 8.
  • the dismantling system 1 is used inside a nuclear installation 9 when an intervention, in particular dismantling, is carried out.
  • Nuclear installation 9 is represented only at the figure 2 , in a simplified way. To the picture 2 , the dismantling system 1 and the nuclear installation 9 are shown in section along a plane comprising a vertical axis Z.
  • the nuclear installation 9 comprises an enclosure 91 which delimits an interior volume V9 in a sealed manner.
  • the enclosure 91 is for example the enclosure of a nuclear reactor, or a containment box.
  • enclosure 91 is the enclosure protecting the reactor core of a Natural Uranium Graphite Gas (UNGG) nuclear power plant.
  • UUG Natural Uranium Graphite Gas
  • the dismantling system 1 makes it possible to manipulate the graphite bricks so as to evacuate them from the stacks 93.
  • the interior volume V9 of the enclosure 91 is therefore subjected to significant radioactive activity, in the form of ionizing radiation and in the form of contamination, such as for example dust and radioactive materials.
  • the dismantling system 1 rests on the enclosure 91 of the nuclear installation 9, via its fixed part 2.
  • the fixed part 2 carries the mast 4, which extends downwards, i.e. i.e. towards the inside of the enclosure 91.
  • the mast 4 is substantially vertical, and thus extends along the vertical axis Z, which is a main axis of the dismantling system 1.
  • the mast 4 is carried by the fixed part 2 at the upper end of the mast.
  • the mast 4 extends through an opening 95, made in the enclosure 91 and opening into the interior volume V9.
  • opening 95 is circular.
  • top In the rest of the description, the terms “top”, “bottom”, “upper”, “lower”, “up” and “down” are understood by referring to the vertical axis Z.
  • orientation “horizontal” refers to an orientation perpendicular to the vertical Z axis.
  • the tool 8 is carried by the mast 4, so as to be able to carry out operations in the volume V9 necessary for the dismantling of the nuclear installation 1.
  • the tool 8 makes it possible to handle the bricks of the stacks 93.
  • the tool 8 comprises in practice a robotic arm fixed to the mast 4 and manipulating one or more tools to carry out the dismantling operations.
  • the mast 4 is formed of several modules, namely an interface module 41 and one or more additional modules 43.
  • the interface module 41 and the additional module(s) 43 are assembled together by being juxtaposed along the vertical axis Z. At the figure 4 , one of the additional modules 43 is shown alone.
  • the interface module 41 is located at the lower end of the mast 4, and makes it possible to fix the tool 8 to the mast 4.
  • the tool 8 is therefore fixed to the lower end of the mast 4.
  • the additional module(s) 43 are therefore located above the interface module 41, and allow, according to the effective number, to modify the height H4 of the mast 4, the height H4 being measured along the vertical axis Z.
  • the mast 4 comprises three additional modules 43.
  • the interface module 41 is a straight circular cylinder section, which is centered on an axis Z41, coinciding with the vertical axis Z in the mounted configuration of the mast 4, and which comprises a cylindrical wall 411.
  • the cylindrical wall 411 is delimited , along the axis Z41, by an upper flange 412 and by a lower flange 413, which form respective opposite edges of the cylindrical wall 411.
  • the upper 412 and lower flanges 413 thus extend in a plane perpendicular to the axis Z41 and are parallel to each other.
  • the cylindrical wall 411 of the interface module 41 is solid, and therefore sealed.
  • An interior volume V41 of the interface module 41 is defined as being the volume delimited radially by the cylindrical wall 411 and axially by the planes in which the flanges 412 and 413 extend.
  • the flanges 412 and 413 of the interface module 41 are assembled in a sealed manner with the cylindrical wall 411, for example by welding.
  • the upper flange 412 has a flat surface 414, of annular shape, perpendicular to the axis Z41 and oriented upwards, and several tapped holes not visible in the figures, extending parallel to the axis Z41 and opening onto the surface plane 414.
  • the tapped holes of the upper flange 412 are regularly distributed around the vertical axis Z41.
  • the top flange 412 includes eighteen tapped holes.
  • the upper flange comprises a different number of tapped holes.
  • D412 denotes the internal diameter of the upper flange 412, measured perpendicular to the vertical axis Z41.
  • the lower flange 413 has a flat surface 416, of annular shape, perpendicular to the axis Z41 and oriented downwards, and several holes 417, extending parallel to the axis Z41 and opening onto the flat surface 416.
  • the lower flange 413 comprises forty holes 417.
  • the lower flange comprises a different number of holes 417.
  • H41 the height of the interface module 41, measured parallel to the axis Z41 between the upper flange 412 and the lower flange 413.
  • the height H41 is preferably between 1000 mm and 1500 mm, in the example equal to 1350 mm.
  • the tool 8 is fixed to the interface module 41 via the lower flange 413.
  • the tool 8 comprises a flange adapted to be fixed to the lower flange 413.
  • the tool 8 when the tool 8 is fixed to the interface module 41, the tool completely and in a sealed manner closes the lower opening of the interface module, that is to say the opening of the lower flange 413.
  • the interior volume V41 of the interface module 41 is not accessible through the lower flange 413 when the tool 8 is fixed to the lower flange.
  • the tool 8 is permanently fixed to the lowest module of the mast 4. In other words, the tool 8 is permanently carried by the lowest module of the mast.
  • Each additional module 43 is a right circular cylinder section, which is centered on an axis Z43, coinciding with the vertical axis Z in the mounted configuration of the mast 4, and which comprises a cylindrical wall 431.
  • the cylindrical wall 431 is delimited, according to the axis Z43, by an upper flange 432 and by a lower flange 433, which form respective opposite edges of the cylindrical wall 431.
  • the upper flanges 412 and lower 413 thus extend in a plane perpendicular to the axis Z43 and are parallel to each other.
  • D4 the outer diameter of the mast 4, which corresponds to the outer diameter of the cylindrical walls 411 and 431 of the modules 41 and 43.
  • the diameter D4 also corresponds to the outer diameter of the upper flanges 412 and 432 as well as to the outer diameter of the lower flanges 433, which are therefore flush with the faces outer diameter of the cylindrical walls 411 and 431.
  • the outer diameter D4 of the mast 4 is constant over the entire height of the mast, that is to say from the bottom of the cylindrical wall 411 of the module 41, to the top of the cylindrical wall 431 of the module 43 above.
  • H43 the height of an additional module 43, measured parallel to the axis Z43 between the upper flange 432 and the lower flange 433.
  • the height H43 is preferably between 1000 mm and 1500 mm, in the example equal to 1250 mm. Alternatively, the heights H41 and H43 are equal.
  • the height H4 of the mast 4 corresponds to the sum of the height of all the modules 41 and 43.
  • the height H4 is equal to three times the height H43 plus one time the height H41.
  • the height of the module 41 and of the modules H43 are adapted according to the working environment of the mast 4 within the nuclear installation 9.
  • the cylindrical wall 431 of the additional modules 43 is solid, and therefore sealed.
  • An interior volume V43 of an additional module 43 is defined as being the volume delimited radially by the cylindrical wall 431 and axially by the planes in which the flanges 432 and 433 extend.
  • each additional module 43 is assembled in a sealed manner with the cylindrical wall 431 of this module, for example by welding.
  • each additional module 43 has a flat surface 434, of annular shape, perpendicular to the axis Z43 and oriented upwards, and several tapped holes 435, extending parallel to the axis Z43 and opening onto the flat surface 434.
  • the tapped holes 435 are regularly distributed around the vertical axis Z43.
  • the top flange 432 includes eighteen tapped holes 435.
  • the top flange includes a different number of tapped holes.
  • D432 denotes the inner diameter of the upper flange 432, measured perpendicular to the vertical axis Z43. In practice, diameter D432 is equal to diameter D412.
  • the diameters D412 and D432 are preferably between 1200 mm and 1800 mm, in the example still preferably equal to 1550 mm.
  • the diameter D4 is preferably between 1250 mm and 1850 mm, in the example still preferably equal to 1650 mm.
  • the upper flanges 432 of the additional modules 43 are identical to the upper flange 412 of the interface module 41.
  • the lower flange 433 of each additional module 43 has a flat surface 436, of annular shape, perpendicular to the axis Z43 and oriented downwards, and several holes 437, extending parallel to the axis Z43 and opening onto the surface plane 436.
  • the lower flange 433 comprises as many holes 437 as the upper flanges 412 and 432 comprise threaded holes.
  • the holes 437 of the lower flange 433 of each additional module 43 are aligned with the tapped holes 435 of the upper flange 432 of this module.
  • each additional module 43 includes recesses 438.
  • the recesses 438 of each additional module 43 extend from the cylindrical wall 431 towards the vertical axis Z43, so as to form niches.
  • the recesses 438 of each additional module 43 are arranged at the level of the lower end of the cylindrical wall 431, so that the lower flange 433 of this module is partially visible in the recesses 438, at the level of the holes 437 which pass through the flange bottom right through, thus opening out opposite the flat surface 436.
  • the holes 437 are through and open into the recesses 438.
  • the holes 437 of each additional module 43 are accessible from outside the additional module, that is to say from the outside of the cylindrical wall 431, via the recesses.
  • the holes 437 of an additional module 43 do not open into the interior volume V43 of this additional module.
  • the heads of the screws are accessible in the recesses 438 of the upper module, which makes it possible to screw the screw from the outside of the additional module 43 higher.
  • the assembly of two juxtaposed modules is therefore carried out by flanges screwed together.
  • Such an assembly is particularly advantageous, because it makes it possible to assemble a module 41 with a module 43 or two modules 43 between them in a sealed manner, that is to say that there is no opening between two modules. juxtaposed connecting their interior volume V41 and V43 with the exterior.
  • each additional module 43 has a centering skirt 439, which extends from the flat surface 436 of the flange, parallel to the axis Z43, moving away from the cylindrical wall 431.
  • the centering skirt 439 therefore forms a section of cylinder centered on the axis Z43 of the additional module, the outer diameter of which, measured perpendicular to the axis Z43 and marked "D439" on the figure 2 , is substantially equal to the diameters D412 and D432, except for games.
  • the centering skirt 439 of the upper module extends through the upper flange 412 or 432 of the lower module , being in contact with the upper flange, and thus extends into the interior volume V41 or V43 of the lowest module.
  • the fact that the outer diameter D439 of the centering skirt 439 is substantially equal to the diameters D412 and D432 makes it possible to center between them two juxtaposed modules, that is to say that their respective axes Z41, Z43 coincide, which is particularly advantageous for facilitating their assembly by screwed flanges, and thus reinforcing the seal between two juxtaposed modules.
  • the interface module 41 and each additional module 43 comprises guide bars 45, which extend parallel to the axes Z41 and Z43 being carried by their cylindrical wall 411, 413.
  • the interface module 41 and each additional module 43 each comprises three guide bars 45, which are regularly spaced in a direction circumferential to the axis Z41, Z43.
  • a different number of guide bars is provided, for example one guide bar or four guide bars.
  • Each guide bar 45 comprises an upper groove 451 and a lower groove 453, which each extend in a plane perpendicular to the vertical axis Z41.
  • each of the bars 45 of the interface module 41 is aligned, in a direction parallel to the vertical axis Z, with one of the bars 45 of the additional module 43 above.
  • each of the bars 45 of the lower module is aligned, in a direction parallel to the vertical axis, with one of the bars 45 of the upper additional module.
  • the guide bars 45 of the modules 41 and 43 together form three guide bars of the mast 4.
  • the interface module 41 and each additional module 43 each comprise a closure plate 47.
  • the closure plate 47 is in practice a disc extending in a plane perpendicular to the vertical axis Z41, Z43 of diameter equal to the diameter D412, D432 and arranged in the interior volume V41, V43 of the module.
  • the closure plate 47 is assembled in a sealed manner with the side wall 411, 431, for example by welding.
  • the closure plate 47 of each module 41, 43 is arranged close to the upper flange 412, 432, so that the volume between the wall cylindrical 411, 431, the closure plate 47 and the plane in which the upper flange 412, 432 extends is negligible compared to the internal volume V41, V43 of the module.
  • the interior volume V41, V43 of each module is delimited radially by the cylindrical wall 411, 431 and axially on the one hand by the closure plate 47 and on the other hand by the plane in which the lower flange 413, 433 extends.
  • the interior volume V41 of the interface module 41 is a closed and sealed volume, when the tool 8 is fixed to the interface module 41. Indeed, this volume is closed in a sealed manner by the cylindrical wall 411, by the closing plate 47 of the interface module 41 and by the tool 8, which completely closes, in a sealed manner, the lower opening of the interface module.
  • each additional module 43 is a closed and sealed volume. Indeed, this volume is sealed off by the cylindrical wall 431 of this additional module, by the closing plate 47 of this additional module and by the closing plate 47 of the additional module or of the interface module, located under this additional module.
  • the fixed part 2 of the dismantling system 1 is better visible at the figure 5 , where it is represented alone and in section, on the same plane as the section of the picture 2 .
  • the fixed part 2 comprises a support 21, which rests on the enclosure 91 of the nuclear installation 9, and a guide cylinder 23.
  • the support 21 and the guide cylinder 23 are assembled together, for example by welding. In practice, the support 21 is arranged outside the enclosure 91.
  • the guide cylinder 23 is a hollow tube, forming an interior volume V23 and extending along a central axis which coincides with the vertical axis Z, from the support 21 towards the interior volume V9 of the nuclear installation 9, at the through the opening 95 of the enclosure 91.
  • the top of the guide cylinder 23 is located outside the enclosure 91 and the bottom of the guide cylinder is located in the interior volume V9 delimited by the pregnant.
  • H23 the height of the guide cylinder 23, measured parallel to the central axis of the guide cylinder.
  • the height H23 is substantially equal to three times the height H43.
  • the guide cylinder 23 surrounds and makes it possible to simultaneously guide three juxtaposed modules among the modules 41 and 43.
  • the fixed part 2 is provided to rest in a sealed manner on the enclosure 91, that is to say so that no opening is present between the outside of the guide cylinder 23 and the enclosure 91.
  • this tightness is obtained by welding the fixed part to the enclosure, or by arranging a joint between the fixed part and the enclosure.
  • the guide cylinder 23 of the fixed part 2 comprises several guides 25, which are arranged inside the interior volume V23.
  • Each guide 25 is elongated and extends parallel to the central axis of the guide cylinder 23.
  • the fixed part 2 comprises three guides 25, which are regularly distributed around a direction circumferential to the central axis of the guide cylinder.
  • the fixed part 2 comprises a different number of guides 25, such as for example one guide or four guides.
  • the fixed part comprises as many guides 25 as each module 41 and 43 comprises guide bars 45.
  • Each guide 25 comprises several pads 251 which are distributed along the guide.
  • each guide comprises three pads 251.
  • each guide 25 is movable in translation along an axis radial to the central axis of the guide cylinder 23 and are actuated by hydraulic cylinders 257. All the pads of the same guide 25 are actuated by hydraulic cylinders 257 connected to the same hydraulic line, so that all the hydraulic cylinders of the same guide exert equal pressure on the pads 251 of this guide.
  • the pads 251 of at least one of the guides 25 include fins 253.
  • the pads 251 of two of the guides 25 do not include fins 253 and the pads of the third guide 25, shown in figure 6 , comprise the fins 253.
  • the fins 253 extend towards the central axis of the guide cylinder 23, giving each of the pads 251 a "U" shape in a plane perpendicular to the central axis.
  • Each guide 25 also includes a finger 255, actuated by a hydraulic cylinder 259.
  • each finger 255 is movable in translation along an axis radial to the central axis of the guide cylinder 23.
  • Each finger 255 is movable between a unlocking position, in which the finger is located closest to the guide cylinder 23, and a locking position, in which the finger is farthest from the guide cylinder 23, that is to say closest to the central axis of the guide cylinder 23.
  • the fixed part 2 also comprises two stops 27, which extend upwards from the upper side of the support 21 parallel to the vertical axis Z.
  • each stop 27 is a tube, in the example a tube rectangular in section.
  • the stops 27 are rigidly fixed to the support 21, for example by bolting or by welding.
  • each abutment 27 is a section, or a mechanically welded assembly.
  • the fixed part 2 comprises a plug 29.
  • the plug 29 is annular in shape and is fixed to the top of the support 21, partially covering the guide cylinder 23.
  • the plug 29 includes a circular opening, of diameter D29.
  • each guide bar 45 is associated with one of the guides 25.
  • the pads 251 of each guide are actuated by the aforementioned jacks until they are in contact with the guide bars 45, and guide bars.
  • the top pad and the bottom pad make it possible to take up the forces exerted by the mast 4, by being in contact with the guide bar of the highest module 41, 43 and of the lowest module among the three modules located in the guide cylinder. It is advantageous for this resumption of the forces to be carried out using two pads separated by a significant vertical distance, because the guiding performance of the mast 4 is improved, as well as the resistance of the dismantling system 1.
  • the central pad ensures the guiding of the mast 4, when the mast 4 consists only of the interface module 41 and an additional module 43.
  • the guide 25 whose pads 251 include the fins 253 surround the guide bars 45 associated with the guide, so as to angularly position the guide bars 45 in a direction circumferential to the vertical axis Z. fins 253 thus prevent the mast 4 from rotating about the vertical axis Z.
  • the guide 25 whose pads 251 include fins 253 is an anti-rotation guide.
  • the fingers 255 are in the locking position, so as to extend into the upper grooves 451 or into the lower grooves 453 of the guide bars 45 of the additional module 43 located the higher along the mast 4, or the interface module 41 during the assembly and dismantling phases of the mast 4, when the mast 4 includes only the interface module.
  • the displacement of the mast 4 along the Z axis, upwards or downwards is prevented, by blocking the guide bars against the fingers 255, when they are in the locking position.
  • Mast 4 is then suspended from fixed part 2 via fingers 255.
  • the mast 4 when the fixed part 2 carries the mast 4, the mast 4 extends in the volume V23 of the guide cylinder 23 but does not occupy the entire volume V23. Thus, an annular space V24 is formed between the mast 4 and the guide cylinder 23.
  • the guides 25 of the fixed part 2 are arranged in the annular space V24.
  • the cap 29 of the fixed part 2 makes it possible to seal the top of the annular space V24 in a leaktight manner.
  • the diameter D29 of the opening of the plug 29 is substantially equal, to within one clearance, to the outer diameter D4 of the mast 4.
  • a seal is advantageously provided between the plug 29 and the mast 4.
  • the interior volume V9 of the nuclear installation 9 is insulated from the outside, that is to say that the enclosure 91 is sealed, despite the presence of the opening 95 through which the guide cylinder 23 passes.
  • no opening is present between the exterior of the guide cylinder 23 and the enclosure 91, thanks to the fixed part 2 which rests in a sealed manner on the enclosure.
  • no opening is present between the guide cylinder 23 and the mast 4, thanks to the plug 29.
  • the mast 4 does not connect the interior volume V9 with the exterior, thanks to the tool 8 and to the closure plates 47, which segment the modules 41 and 43 in a sealed manner.
  • the dismantling system 1 comprises flexible hoses 81, shown schematically only in figure 7 and at the figure 12 , arranged in the annular space V24.
  • the hoses 81 are intended for supplying the tool 8 with energy and/or for controlling it.
  • the hoses 81 can combine flexible hydraulic or pneumatic pipes and/or conductive cables making it possible to deliver an electrical power supply and/or to transmit electrical signals corresponding to control signals or to data, for example coming from sensors belonging to the tool 8.
  • a passage is made in the cap 29 for the hoses 81, this passage being sealed.
  • the mast 4 is represented with the interface module 41 and three additional modules 43.
  • the number of additional modules 43 can be reduced, to lower the height H4 of the mast, or increased, to increase the height H4.
  • the handling system 6 is provided for this purpose, allowing additional modules 43 to be added or removed from the mast 4.
  • the handling system 6 comprises two actuators 61, extending vertically upwards. Each actuator 61 is supported and guided by a guide structure 63.
  • the actuators 61 are cylinders, preferably hydraulic cylinders.
  • the jacks 61 are pneumatic jacks, or electric jacks.
  • Each cylinder 61 comprises a lower end 611, fixed to the guide structure 63, and an upper end 613, movable relative to the guide structure 63.
  • Each cylinder 61 is operable, that is to say it is intended to be actuated in a withdrawal-extension movement, making it possible to vary its length L61, which corresponds to the distance, measured parallel to the vertical axis Z, between its ends 611 and 613.
  • the upper end 613 of each cylinder 61 is guided in its withdrawal-extension movement by a guide 615, fixed with respect to the upper end 613 and which slides on the associated guide structure 63.
  • the cylinders 61 are thus operable between a retracted configuration, in which the upper ends 613 are closest to the lower ends 611, and an extension configuration, in which the upper ends are furthest from the lower ends.
  • the length L61 varies between 750 mm, when the jacks are in the retracted configuration, and 2100 mm, when the jacks are in the extended configuration.
  • the stroke of the cylinders 61 is equal to 1350 mm.
  • the cylinders 61 are shown in the extended configuration.
  • the cylinders are shown in the retracted configuration.
  • the stroke of the cylinders 61 is at least equal to the height H43 of the modules 41 and 43.
  • the guide structures 63 are fixed to the fixed part 2, more precisely to the support 21, and extend from the fixed part 2 upwards.
  • the guide structures 63 are for example welded to the support 21. In practice, the guide structures 63 are located on either side of the guide cylinder 23.
  • the handling system 6 comprises a lifting beam 65 and a handling clamp 67.
  • the spreader bar 65 is designed to be connected to lifting means, such as for example a traveling crane or a crane, which are not shown in the figures.
  • lifting means such as for example a traveling crane or a crane, which are not shown in the figures.
  • the lifter 65 is movable horizontally and vertically in the nuclear installation 9, outside the enclosure 91.
  • the lifter 65 is a single-beam lifter, comprising two lifting points 651 and two ends 653.
  • the lifting points 651 are for example used for the passage of slings to connect the lifting beam to an overhead crane.
  • the lifter 65 is of another type, for example a one-piece lifter or a multi-beam lifter.
  • the handling flange 67 is fixed to the lifting beam 65.
  • the lifting beam comprises two attachment points 655, which make it possible to fix the handling flange.
  • the number of attachment points 655 is different, for example three or four.
  • the handling flange 67 is designed to be fixed to an additional module 43, being fixed to the upper flange 432 of the additional module.
  • the handling system 6 makes it possible, in cooperation with lifting means not shown, to handle an additional module 43 in the nuclear installation 9.
  • an additional module 43 handled by the handling system 6 is suspended under the handling flange 67.
  • an additional module 43 not forming part of the mast 4 is thus shown suspended from the handling system 6.
  • the lifter 65 is further provided to be placed on the upper ends 613 of the cylinders 61, via its ends 653.
  • the actuation of the cylinders 61 for example to pass from their extended configuration to their retracted configuration , then causes a vertical displacement of the lifting beam 65.
  • a high position of the lifting beam is thus defined, which corresponds to the extension configuration of the cylinders, and a low position of the lifting beam, which corresponds to the retraction configuration of the cylinders.
  • the lifting means remain connected to the lifter, but are not used, that is to say the lifting means do not carry the lifter. Maintaining the lifting means connected to the lifting beam makes it possible to prevent a worker from approaching the dismantling system 1 to disconnect the lifting means from the lifting points 651.
  • the lifting means are used to place or remove the lifter 65 on the cylinders 61, regardless of whether a module is attached to the handling system 6 or not.
  • the lifter 65 is shown resting on the jacks 61 at the figures 9 to 11 .
  • the guide structures 63 make it possible to guide the lifter 65, in particular when it is not attached to a module.
  • the guide structures 63 are preferably in the shape of a "C" in a horizontal plane, the opening of which is directed towards the Z axis.
  • the openings of the guide structures 63 are directed towards each other.
  • the lifter 65 rests on the cylinders 61, it extends between the two guide structures 63, and each guide structure surrounds one of the ends 653 of the lifter.
  • the guide structures prevent any horizontal movement of the lifter 65, which makes it possible to secure the movement of the lifter between its high and low positions when it is not coupled to a module.
  • the dismantling system 1 is particularly suitable for nuclear environments, which are subject to strong constraints in terms of radiation protection, that is to say in terms of controlling ionizing radiation and radioactive contamination.
  • the mast 4 has a sealed interior volume, formed jointly by the volumes V41 and V43.
  • the fixed part 2 and the mast 4 make it possible to block ionizing radiation, so as to limit their escape through the opening 95 outside the enclosure 91.
  • an ionizing radiation directed towards the opening 95 must necessarily, to cross the opening 95, cross at least the guide cylinder 23, the modules of the mast 4 or the stopper 29, thus reducing its intensity and therefore its dangerousness.
  • the dismantling system 1 thus allows, for workers located outside the enclosure 91, to limit exposure to ionizing radiation directed towards the opening 95.
  • the dismantling system 1 Another advantage of the dismantling system 1 is the large diameter D4 of the mast 4, which allows the use of a tool 8 of large size.
  • the tool 8 is provided to be able to pass through the guide cylinder 23, and its size in a horizontal plane is thus conditioned by the diameter of the guide cylinder 23, itself provided according to the diameter of the mast 4.
  • the mast 4 having a large diameter D4, the tool 8 can have a large size in a horizontal plane. The tool 8 can thus be more efficient, which facilitates the dismantling operations of the nuclear installation 9.
  • the fact that the modules 41 and 43 are cylindrical increases the rigidity of the mast 4 while controlling its mass, and the mast being symmetrical, it has no preferential direction for receiving forces. In other words, the mast is suitable for working in all directions.
  • a method is now described which makes it possible to add an additional additional module 43 to the mast 4, which, in the example, makes it possible to pass from two additional modules to three additional modules.
  • This method is therefore a mast extension method 4.
  • the first step of the mast 4 extension method consists of bringing the additional module 43n+1 closer to the mast 4, using the handling system 6. This first step is shown on the figure 1 And 2 .
  • the additional module 43n+1 is first of all fixed to the handling flange 67 of the handling system 6, by screwing the upper flange 432 of the additional module with the handling flange, then the module additional 43n+1 is handled in the nuclear installation 9 using the lifting beam 65.
  • the mast 4 is locked on the fixed part 2 using the fingers 255, which extend into the grooves high 451 of the guide bars 45 of the highest additional module 43, that is to say of the additional module 43n.
  • the second extension step consists in fixing the additional module 43n+1 to the mast 4.
  • the lifter 65 is first of all positioned in the high position, by being brought into contact with the cylinders 61, the cylinders being in the configuration of 'extension.
  • This second step is shown on the figure 9 And 10 . If necessary, at the start of the second stage, the jacks are actuated to their extended configuration.
  • the axis Z43 of the additional module 43n+1 coincides with the axis Z43 of the additional module 43n and the lower flange 433 of the additional module 43n+1 is in contact with the upper flange 432 of the additional module 43n.
  • the lower flange 433 of the additional module 43n+1 is then fixed to the upper flange 432 of the additional module 43n, by screwing.
  • the additional module 43n+1 is then fixed to the mast 4, and thus corresponds to the highest additional module 43 of the mast.
  • the centering of the additional module 43n+1 on the module additional 43n is facilitated by the centering skirt 439 of the module 43n+1, which penetrates into the upper flange 432 of the module 43n.
  • the additional module 43n+1 is arranged, along the vertical axis Z, above the fixed part 2, and the mast 4 is maintained on the one hand by being fixed on the fixed part 2 via the additional module 43n, whose high grooves 451 receive the fingers 255, and on the other hand by being suspended under the crossbar 65, which rests on the jacks 61, via the flange handling 67.
  • the third extension step consists of lowering the mast 4, relative to the fixed part 2, so that the mast is fixed to the fixed part 2 via the additional module 43n+1.
  • the fingers 255 of the guides 25 are tilted into the unlocking position, so that the mast 4 is only held in position by the handling flange 67 while being suspended under the spreader bar 65.
  • the cylinders 61 are retracted from their extension configuration to their retracted configuration, causing the descent, along the vertical axis Z, of the lifter 65 and of the mast 4.
  • the lifter 65 is thus lowered from its high position to its low position. From the extension configuration to the cylinder withdrawal configuration, the mast 4 descends, along the vertical axis Z, by a height equal to the height H43.
  • the dismantling system 1 is shown at the end of the third stage of extending the mast 4.
  • the spreader bar 65 when the spreader bar 65 is in the low position, its ends 655 rest on the stops 27 of the fixed part 2. Thus, the low position of the spreader bar 65 is stable, including in the event of failure of one or more two cylinders 61.
  • the stops 27 make it possible to precisely define the lower position of the lifter 65, including when the upper end 611 of the cylinders descends can descend lower than the stops 27.
  • the mast is guided by the guide cylinder 23, by cooperation of the guide bars 45 with the pads 251 of the guides 25.
  • the fourth and final step of extending the mast 4 consists in separating the mast 4 from the handling system 6.
  • the handling flange 67 is separated from the additional module 43n+1, by removing the screws connecting the upper flange 432 of the module additional to the handling flange.
  • the jacks 61 are then deployed from their retracted configuration to their extended configuration, so as to raise the lifter 65 and the handling flange 67 in the high position. This configuration is shown in figure 12 .
  • the lifting beam 65 is either kept placed on the jacks 61, or moved away from the fixed part 2 and from the mast 4, using the lifting means, until a secure parking position within the nuclear installation 9.
  • the jacks are either kept in the extended configuration, or retracted in the retracted configuration, so that the lifter 65 also rests on the stops 27, in a stable manner.
  • This method of extending the mast 4 also applies to the installation of the first additional module 43, that is to say the lowest additional module, on the interface module 41.
  • the module additional module 43 corresponds to the additional module 43n+1 previously described and the interface module 41 corresponds to the additional module 43n previously described, the reference signs being adapted accordingly.
  • the first step of the method of shortening the mast 4 consists in suspending the mast 4 from the handling system 6. This step is substantially similar to the fourth step of the method of extending the mast 4, carried out in reverse.
  • the lifter 65 is, if necessary, placed on the jacks 61, then the jacks are lowered in the retracted configuration, allowing the lifter 65 to be lowered from its high position to its position low, and the handling flange 67 is screwed to the upper flange 432 of the additional module 43n+1.
  • the jacks are lowered beforehand in the retracted configuration, then the spreader bar is placed on the jacks, having been lowered by the lifting means from its high position to its low position, then the handling flange 67 is screwed to the additional module 43n+1.
  • the second step of the method of shortening the mast 4 consists in raising the mast 4, with respect to the fixed part 2.
  • This step is substantially similar to the third step of the method of extending the mast 4, carried out in an inverted manner.
  • the fingers 255 are swung into the unlocking position to release the additional module 43n+1 and allow the deployment of the cylinders 61 in the extended configuration, then the fingers are swung into the locking position, so as to fix the mast 4 with respect to the fixed part 2, via the additional module 43n.
  • the mast is guided by the guide cylinder 23, by cooperation of the guide bars 45 with the pads 251 of the guides 25.
  • the third step of the mast 4 shortening method consists in detaching the additional module 43n+1 from the mast 4. To do this, the screws now fixed together the upper flange 432 of the additional module 43n and the lower flange 433 of the additional module 43n+ 1 are removed. At the end of this step, the additional module 43n+1 is no longer part of the mast 4 and the mast is no longer suspended from the crossbar 65.
  • the fourth step of the mast 4 shortening method consists in removing the additional module 43n+1.
  • the lifter 65 is used, with the help of the lifting means, to move the additional module 43n+1 away from the mast 4 and the fixed part 2, for example up to a storage area of the nuclear facility 9. During this step, the lifter 65 is therefore separated from the jacks 61.
  • This method of shortening the mast 4 also applies for removing the first additional module 43, that is to say the lowest additional module.
  • the additional module 43 corresponds to the additional module 43n+1 previously described and the interface module 41 corresponds to the additional module 43n previously described, the reference signs being adapted accordingly.
  • the mast can be raised or lowered by one height less than the height of a module, thanks to the low grooves 453.
  • raising the mast can be done in two operations.
  • a first operation consists in removing the fingers 255 from the high grooves 451 of the additional module 43n+1 by tilting the fingers into the unlocking position, then in deploying the cylinders 61 to an intermediate configuration between the withdrawal configuration and the configuration of extension, then to switch the fingers into the locking position, so that they fit into the lower grooves 453 of the module 43n+1.
  • a second operation then consists in tilting the fingers 255 into the unlocking position, out of the lower grooves 453, then in deploying the cylinders 61 to their extended configuration, then in tilting the fingers in the locking position, so as to complete the rise of the mast 4.
  • the methods for extending and shortening the mast 4 are particularly simple to implement, which is very advantageous for varying the height H4 of the mast 4. It is thus simple to adjust the vertical position of the tool 8, which depends on the height of the mast, depending on the operations to be carried out by the tool.
  • the methods of extending and shortening the mast 4 are particularly advantageous, because they are secure and reliable. Indeed, at each step of these methods, the mast 4 is held in a secure manner, by the fixed part 2 and/or by the lifter 65. The risks of accident, such as for example the mast 4 falling, are therefore controlled. , which is crucial in a nuclear environment.
  • the safety of the dismantling system 1 is also improved by the presence of the stops 27. Indeed, in the event of failure of one of the two cylinders 61, or of the two cylinders 61, the lifter 65 bears on the stops 27, which prevents its uncontrolled fall into the interior volume V9 of the nuclear installation 9. The stops 27 thus make it possible to retain the spreader bar 65 and to prevent mast 4 from falling.
  • the method of shortening the mast 4 makes it possible to control the radioactive risks during the removal of an additional module 43n+1. Indeed, no manipulation of the additional module is carried out until the module is reassembled outside of volume V9, that is to say until the module is located above the part fixed 2. Thus, the workers unscrewing the module 43n+1 from the module 43n are protected from ionizing radiation by the fixed part 2 and by the mast 4, as explained above.
  • controlling radioactive pollution, in particular radioactive dust, is particularly easy when removing an additional module 43n+1.
  • the module 43n+1 when the module 43n+1 is located above the fixed part 2 and before this module is separated from the module 43n, it is very easy to decontaminate by mechanical cleaning, for example using impregnated wipes. Indeed, thanks to the fact that the volume V43 is sealed, only the outer surface of the module must be cleaned, which is simple to achieve. This cleaning is all the more simple to carry out when the additional module 43n+1 is located at working height for a worker positioned standing on the enclosure 91 of the nuclear installation 9. Indeed, the height between the enclosure 91 , at the level of the opening 95, and the bottom of the additional module 43n+1, corresponds approximately to the height H43 of the modules 41 and 43.
  • the height H43 being preferably between 1000 mm and 1500 mm, the module 43n+1 is accessible at head height, which allows easier intervention on the part of a worker, including when this worker is wearing nuclear protection clothing, which is generally cumbersome.
  • the fixed part 2 comprises a different number of guides 25, for example one guide, or four guides.
  • the number of guide bars 45 of the modules 41 and 43 is then adapted accordingly.
  • the mast 4 is also centered with respect to the guide cylinder 23 by one or more slideways.
  • each guide 251 of a guide 25 some are movable in translation by being actuated by the hydraulic cylinders 257, and others are fixed.
  • each guide comprises a fixed pad and two mobile pads.
  • the distribution between fixed runners and mobile runners can be identical between all the guides, or vary between the guides.
  • some comprise only pads 251 movable in translation being actuated by the hydraulic cylinders 257, and others comprise only fixed pads
  • the height H23 is substantially equal to a multiple of the height H43 different from three, for example once the height H43, or four times the height H43.
  • the guides 25 then comprise a different number of pads 251, for example one or four pads 251.
  • the guide cylinder 23 makes it possible to simultaneously guide a number of modules 41 and 43 different from three, such as one or four mods.
  • the guide bars 45 do not include a lower groove 453, or intermediate grooves, arranged between the upper grooves and the lower grooves.
  • the jacks 257 and/or the jacks 259 are actuators other than hydraulic jacks, such as for example pneumatic jacks, electric jacks or linear electromagnets.
  • the cylinders 61 are replaced by other actuators, such as for example systems with helical columns, systems with winches and cables, racks, endless screw systems, or else push chains.
  • the interface module 41 is identical to the additional modules 43.
  • the tool 8 is then adapted to be able to be fixed to the lower flanges of the modules.
  • the modules 41 and 43 are non-circular straight cylinder sections, such as straight prism sections, for example.
  • all the modules 41 and 43 do not include a closing plate 47.
  • only the lowest module of the mast 4 includes a closing plate.
  • the lower flange 413 of the interface module 41 comprises a centering skirt 439, making it possible to center the tool 8 with respect to the interface module.
  • connections between modules 41 and 43, as well as the connection of the modules with the handling flange 67 are screwed connections.
  • the connections between modules 41 and 43, and/or the connection of the modules with the handling flange are made using other types of removable rigid connections.
  • the modules are assembled together, and with the handling flange, by bolted, pinned or assembly collar type connections.
  • the connection between the modules and the connection of a module with the handling flange are of the same type.
  • the crossbar 65 when the crossbar 65 is in the low position, it rests on the stops 27.
  • the mast 4 is both held by the fingers 255 which fit into the upper grooves 451 and by the lifter 65 which rests on the stops.
  • the stops are arranged lower than the lower position of the lifter, so that the lifter does not rest on the stops.
  • the stops 27 are then safety devices making it possible to retain the lifting beam 65 and to prevent the fall of the mast 4 in the event of failure of the fingers 255 or the cylinders 61, and facilitate the maintenance of the mast by allowing it to be maintained during operations. specific maintenance.
  • the fixed part 2 of the dismantling system 1 rests directly on the enclosure 91 of the nuclear installation 9.
  • the dismantling system is therefore fixedly connected to the nuclear installation.
  • the fixed part 2 rests on a platform, this platform itself resting on the enclosure 91.
  • the platform seals off the opening 95 of the enclosure 91, and the platform itself comprises a passage opening for the guide cylinder 23 and the mast 4, this passage opening being itself closed in a sealed manner by the dismantling system 1.
  • the guide cylinder 23 of the part fixed 2 then always extends through the opening 95 of the enclosure 91, since it extends through the opening of the platform itself placed in the opening 95 of the enclosure.
  • Such a platform is either fixed or mobile in rotation on itself, relative to the nuclear installation and relative to the enclosure 91, around a vertical axis of rotation.
  • the dismantling system is connected to the nuclear installation via the platform, either in a fixed manner or in a mobile manner.
  • the axis of rotation of the platform is offset from the main axis Z of the dismantling system 1.
  • the rotation of the platform on itself leads to a displacement of the dismantling system and therefore of the mast 4 in a plane perpendicular to the main axis Z, which makes it possible to increase the field of action of the tool 8 fixed at the bottom of the mast, thus facilitating dismantling operations.
  • the mobile platform is not driven in rotation during the extension or the shortening of the mast 4.
  • the fixed part 2 can rest on any structure, fixed or mobile, arranged intermediate between the fixed part and the pregnant 91.
  • the spreader bar 65 is first placed in the high position on the jacks 61, the jacks being in the extended configuration, then the additional module 43n+1 is fixed to the additional module 43n.
  • the jacks are in the retracted configuration.
  • the additional module 43n+1 is first of all put in place on the additional module 43n using the lifter 65, the centering of the two modules being facilitated by the insertion of the skirt centering 439 of the module 43n+1 in the upper flange 432 of the module 43n, then the additional module 43n+1 is fixed to the module 43n, thus extending the mast 4.
  • the last step consists in separating the mast 4 from the handling system 6.
  • the spreader beam 65 is no longer connected to the mast 4.
  • the spreader bar 65 is not connected to the mast.
  • the spreader bar 65 is connected to the mast, that is to say the handling flange 67 is fixed to the highest module of the mast. In such a variant, the lifter is thus in the low position. In practice, this configuration then corresponds to the configuration shown in figure 11 .
  • the order of the steps of the mast extension method then differs: the extension method begins with the fourth step, which consists of separating the mast from the handling system, then the method continues with the first step , which consists in approaching the additional module 43n+1, by the second step, which consists in fixing the additional module to the mast, then ends with the third step, which consists in lowering the mast 4.
  • the shortening method begins with the second step, which consists of raising the mast 4, then continues with the third step, which consists in detaching the additional module 43n+1, then with the fourth step, which consists in evacuating the additional module using the lifting beam, then ends with the first step, which consists in fixing the handling flange 67 to the shortened mast 4.
  • the advantage of this variant is that, when the tool 8 is in operation to carry out dismantling operations, the mast 4 remains connected to the lifter 65, which then serves as a safety device: in the event of failure of the guide cylinder 23, by example of the fingers 255, the fall of the mast 4 is prevented by the lifter.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Plasma & Fusion (AREA)
  • Manipulator (AREA)
  • Working Measures On Existing Buildindgs (AREA)
EP22196886.0A 2021-09-22 2022-09-21 Zerlegungssystem für kerntechnische anlage Pending EP4156206A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR2109987A FR3127324A1 (fr) 2021-09-22 2021-09-22 Système de démantèlement pour installation nucléaire

Publications (1)

Publication Number Publication Date
EP4156206A1 true EP4156206A1 (de) 2023-03-29

Family

ID=79171167

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22196886.0A Pending EP4156206A1 (de) 2021-09-22 2022-09-21 Zerlegungssystem für kerntechnische anlage

Country Status (2)

Country Link
EP (1) EP4156206A1 (de)
FR (1) FR3127324A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2176924A (en) 1985-06-11 1987-01-07 Atomic Energy Authority Uk Decommissioning nuclear reactor
FR2743445A1 (fr) * 1996-01-10 1997-07-11 Framatome Sa Procede et dispositif de demantelement et d'evacuation d'equipements internes inferieurs d'un reacteur nucleaire refroidi par de l'eau sous pression
EP2466591A1 (de) * 2010-12-17 2012-06-20 The European Atomic Energy Community (EURATOM), represented by the European Commission Ferngesteuerte Handhabungsvorrichtung zum Betreiben von Speicherzellen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2176924A (en) 1985-06-11 1987-01-07 Atomic Energy Authority Uk Decommissioning nuclear reactor
FR2743445A1 (fr) * 1996-01-10 1997-07-11 Framatome Sa Procede et dispositif de demantelement et d'evacuation d'equipements internes inferieurs d'un reacteur nucleaire refroidi par de l'eau sous pression
EP2466591A1 (de) * 2010-12-17 2012-06-20 The European Atomic Energy Community (EURATOM), represented by the European Commission Ferngesteuerte Handhabungsvorrichtung zum Betreiben von Speicherzellen

Also Published As

Publication number Publication date
FR3127324A1 (fr) 2023-03-24

Similar Documents

Publication Publication Date Title
EP2011124B1 (de) Ladebehälter-fass für mindestens ein kernbrennstoffbündel und ladeprozedur
BE897468A (fr) Procede de remplacement des broches de guidage d'un tube-guide et dispositif correspondant
EP0362005B1 (de) Verfahren und Vorrichtung zum Herausziehen von Blockierhülsen aus Führungsrohren von zerlegbaren Kernreaktor-Brennstabbündeln
EP0500404A1 (de) Verfahren und Vorrichtung zur Zerlegung interner Komponent eines wassergekühlten Kernreaktors
FR2848717A1 (fr) Procede et dispositif de manutention d'un tube-guide des equipements internes superieurs d'un reacteur nucleaire
EP4156206A1 (de) Zerlegungssystem für kerntechnische anlage
EP0185561A1 (de) Reinigungsvorrichtung der Führungsrohre von Neutronenflussmesseinrichtungen in einem Druckwasserkernreaktor
FR2770927A1 (fr) Machine de chargement pour deplacer des objets oblongs etroitement voisins, notamment des assemblages combustibles
EP4156207A1 (de) Zerlegungssystem für kerntechnische anlage und verfahren zur verlängerung und verkürzung des mastes eines solchen zerlegungssystems
EP1279172A1 (de) Verfahren und vorrichtung zum beladen einer kernreaktorspaltzone mit brennstabbündeln
EP0360665B1 (de) Vorrichtung zum Einsetzen von Führungsrohrblockierhülsen in ein Kopfstück eines zerlegbaren Kernreaktorbrennstabbündels
FR2788628A1 (fr) Dispositif et procede de chargement du coeur d'un reacteur nucleaire
EP0742562B1 (de) Verfahren zum Einbauen einer abgedichteten Durchführung durch eine Zellenwand
EP0498691A1 (de) Vorrichtung zur Zerschneidung eines Bestandteiles von einem nuklearen Reaktor
FR2681466A1 (fr) Grappin orientable de manutention d'assemblage combustible nucleaire.
FR2743445A1 (fr) Procede et dispositif de demantelement et d'evacuation d'equipements internes inferieurs d'un reacteur nucleaire refroidi par de l'eau sous pression
EP0081431B1 (de) Fixierungseinrichtung für ein Brennelementbündel auf der unteren Kernträgerplatte eines Kernreaktors
EP0402231A1 (de) Fernbediente selbstklemmende Greifvorrichtung für zylindrische Fässer
EP0098781A1 (de) Einrichtung zur Nachprüfung des Ausschaltens der Steuerbündel eines Kernreaktors
FR2722324A1 (fr) Dispositif de pose et d'extraction d'un manchon de blocage d'un tube-guide dans un embout demontable d'un assemblage combustible de reacteur nucleaire
FR2846466A1 (fr) Procede et dispositif de manutention et de separation de la plaque superieure de coeur d'un reacteur nucleaire a eau sous pression, d'un assemblage de combustible
FR2937457A1 (fr) Procede de recuperation d'au moins un assemblage de combustible reste accroche sous une plaque superieure d'un coeur d'un reacteur nucleaire a eau sous pression
EP3084772B1 (de) Vorrichtung zur zusammenfügung mit einem behälter mit bestrahltem brennstoff unter einer kernkraftanlagengrube und mit bestrahltem brennstoff
FR2625023A2 (fr) Dispositif de jonction entre un conteneur de transport et une paroi horizontale d'une enceinte de dechargement
EP0589792B1 (de) Handhabungseinrichtung für Rohrbündel von Wärmetauschern

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20230905

RBV Designated contracting states (corrected)

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR