EP1573750B1 - Vorrichtung zum Transportieren von Kernbrennelementen - Google Patents

Vorrichtung zum Transportieren von Kernbrennelementen Download PDF

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Publication number
EP1573750B1
EP1573750B1 EP02808356A EP02808356A EP1573750B1 EP 1573750 B1 EP1573750 B1 EP 1573750B1 EP 02808356 A EP02808356 A EP 02808356A EP 02808356 A EP02808356 A EP 02808356A EP 1573750 B1 EP1573750 B1 EP 1573750B1
Authority
EP
European Patent Office
Prior art keywords
housing
assembly
fuel assembly
clamping means
end piece
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.)
Expired - Lifetime
Application number
EP02808356A
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English (en)
French (fr)
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EP1573750A1 (de
Inventor
Roger Lahille
Laurent Stachetti
Olivier Bernard
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.)
TN International SA
Original Assignee
TN International SA
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Filing date
Publication date
Application filed by TN International SA filed Critical TN International SA
Publication of EP1573750A1 publication Critical patent/EP1573750A1/de
Application granted granted Critical
Publication of EP1573750B1 publication Critical patent/EP1573750B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • G21F5/00—Transportable or portable shielded containers
    • G21F5/06—Details of, or accessories to, the containers
    • G21F5/12—Closures for containers; Sealing arrangements
    • 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
    • G21F5/00—Transportable or portable shielded containers
    • G21F5/005—Containers for solid radioactive wastes, e.g. for ultimate disposal
    • G21F5/008—Containers for fuel elements
    • G21F5/012—Fuel element racks in the containers

Definitions

  • the invention relates to a method of blocking a nuclear fuel assembly in a housing provided to receive this assembly.
  • the invention also relates to a device designed to implement this blocking method.
  • fuel assembly refers to a nuclear fuel assembly.
  • such an assembly comprises a rigid frame which supports a bundle of tubes, each tube containing a stack of nuclear fuel pellets and being closed at its ends.
  • the invention is particularly applicable to the transport of fresh fuel assemblies, that is to say non-irradiated. It can be used for all types of fuel assemblies, and especially for those intended for pressurized water and boiling water nuclear reactors.
  • the transport of fresh fuel assemblies between their manufacturing site and the nuclear reactor in which they are to be used is usually carried out in transport packages provided for this purpose.
  • Each transport package comprises a cavity in which is housed a basket provided with one or more housings.
  • the shapes and dimensions of the housing are such that each of them can receive a single nuclear fuel assembly.
  • the number of housings provided in the same basket depends on the size of the fuel assemblies that are to be transported.
  • the document FR-A-2,773,415 proposes to block a fuel assembly of square section within its housing by placing on two adjacent faces of the latter, adjustable clamping means which apply the assembly against the other two sides of the housing.
  • the adjustable clamping means are operated from the open end of the housing. They can be entirely mechanical or incorporate gas cylinders.
  • the locking devices described in this document perform their function satisfactorily. However, they have the notable disadvantages of having a mass and a high manufacturing price, as well as a large footprint. Indeed, the locking devices are integrated in the walls of the cells, which substantially increases the thickness. The number of cells contained in the same package is therefore reduced by the presence of these devices. As a result, the transport capacity of packaging is limited, which leads to an increase in the number of transports to be performed for recharging the core of a nuclear reactor. The overall price of delivery is increased.
  • FR-A-2,674,667 , FR-A-2,674,668 and FR-A-2,774,800 propose to clamp an assembly in its housing by making two adjacent sides of the housing on an articulated portion of the package and placing clamping means on this articulated portion.
  • the invention particularly relates to a transport basket comprising a device designed to block a fuel assembly inside a housing by simple means, inexpensive and having a minimum space in the direction of the thickness of the walls of the housing. housing, such so that an increased number of assemblies can be transported simultaneously.
  • the blocking of the fuel assembly is effected by a device which connects the upper end of the assembly to the open end of the housing, this device can be placed in the housing, above the assembly. Therefore, the thickness of the walls separating the adjacent dwellings can be given a minimum value. For a given size of the packaging, it is therefore possible to transport a larger number of assemblies with the locking devices of the prior art. In addition, the mass and the manufacturing cost of the device according to the invention are reduced compared to the prior art.
  • the fuel assembly and the housing usually have polygonal sections, the more often square.
  • the predetermined relative position between the upper end of the fuel assembly and the open end of the housing is then such that the upper end bears against two adjacent faces of the housing.
  • the device further comprises a reduced section portion of the housing, located near the bottom thereof, said reduced section portion having substantially equal dimensions to those of a lower end of the fuel assembly.
  • the predetermined relative position defined by the means capable of making a rigid connection is such that the fuel assembly is not in contact with a shim placed in the second end of the housing.
  • the means capable of making a rigid connection comprise a connecting member adapted to be fixed on the upper end of the assembly by first clamping means and adapted to be fixed in the open end of the housing by second clamping means.
  • the connecting member advantageously incorporates transverse displacement means, able to move the upper end of the assembly to the two adjacent faces of the housing and away from them, as well as means for axial displacement. , able to move the assembly away from the second end of the housing and towards said second end.
  • the first clamping means, the second clamping means, the transverse displacement means and the axial displacement means are actuated by separate control members, able to be operated separately.
  • the connecting member has a longitudinal axis capable of being oriented parallel to a longitudinal axis of the fuel assembly.
  • the first clamping means then preferably comprise jaws able to move on a first part of the connecting member in directions substantially radial with respect to said axis.
  • the second clamping means comprise a bayonet ring adapted to rotate on a second portion of the connecting member about said axis.
  • the axial displacement means comprise means for controlling a relative displacement between the first and the second portion along said axis and the transverse displacement means comprise at least one slide adapted to move on the first part of the connection in a substantially radial direction with respect to said axis. The slide is then also part of the second clamping means.
  • the first clamping means, the second clamping means and the axial displacement means are actuated by a single control member, and the transverse displacement means are actuated by another control member. control capable of being operated separately from the single control member.
  • the single control member is advantageously a screw, rotatably anchored on the connecting member, said screw acting on thrust rods forming both the first clamping means and the axial displacement means, and acting on jaws forming the second clamping means, by means of control rods articulated on the connecting member, on a nut engaged on the screw, on the push rods and on the jaws, and the means transverse displacement comprise thrust pads anchored on the connecting member.
  • the first clamping means, the transverse displacement means and the axial displacement means are actuated by a single control member.
  • the second clamping means then comprise a separate fastener.
  • the single control member is advantageously a screw, rotatably anchored on the connecting member, said screw acting on claws forming both the first clamping means, the axial displacement means and the means transverse displacement, by means of a nut engaged on the screw and on which are articulated said claws.
  • a fresh nuclear fuel assembly A when a fresh nuclear fuel assembly A is to be delivered to the site of a nuclear reactor, it is placed inside a housing L provided for this purpose in a basket, designed to be itself housed in a transport packaging.
  • One or more housing L can be arranged in the same basket, without departing from the scope of the invention.
  • Each housing L is sized to receive a single assembly A.
  • the internal dimensions of the housing L are slightly greater than those of the assembly A.
  • fuel assemblies A always comprise a rigid frame that supports a bundle of rods.
  • Each pencil comprises a tube closed at its ends and in which is placed a stack of nuclear fuel pellets.
  • the rigid frame comprises in particular an upper end piece ES, a lower end piece EI and rods rigidly connecting these end pieces.
  • the upper end piece ES can take different forms, depending on the type of reactor for which the assembly is intended.
  • each housing L is delimited laterally by a tubular wall T whose section has a shape identical to that of the assembly A. This shape is square on the figure 2 .
  • the housing L When the housing L is oriented vertically as illustrated by figure 2 it is open at its high end and has a wedge C at its lower end.
  • the bottom F of the cavity of the package in which the basket is placed closes the lower end of the housing L.
  • the wedge C is designed to axially support the assembly A at its lower end EI.
  • the open end of the housing L is embodied by a support plate, called "head plate" PT, fixed on the upper end of the tubular wall T.
  • the packaging When loading and unloading assemblies A, the packaging is generally oriented so that the longitudinal axis of each housing L is substantially vertical. On the other hand, the transport takes place while the lodgings L are in a supine position, substantially horizontal. The assemblies A are then resting on two adjacent lateral faces of the housing L, facing downwards so as to form a V between them, as illustrated on FIG. figure 2 .
  • a first locking device is provided between each assembly A and its housing L and a second locking device is provided between the basket and the transport packaging.
  • This second blocking device does not form part of the invention.
  • the locking device of the assembly A in its housing L mainly comprises a fastening system 10, designed to provide a rigid connection between the upper end piece ES of the assembly A and the open end of the housing L, materialized by the PT head plate.
  • this rigid connection defines a predetermined relative position between the assembly A and its housing L.
  • the relative position thus defined is such that the fuel assembly A is not in contact with the wedge C provided in the low end. of the housing L.
  • This clearance allows the assembly to expand along its axis inside its housing without interfering with that -this.
  • the value of this game can be about 6 mm.
  • the fastening system 10 advantageously comprises axial displacement means able to move the assembly away from the bottom F of the housing L and towards said bottom.
  • the fastening system 10 also comprises transverse displacement means arranged to move the upper end piece ES of the assembly A towards the two adjacent lateral faces of the assembly.
  • L housing intended to be turned down during the transport of the package, and away from these two faces side.
  • This displacement is made possible by the fact that there is a predetermined clearance, in the transverse direction, between the assembly A and the housing L, over most of the height thereof. This game is necessary for the proper introduction of the assembly in its housing during loading.
  • the value of this transverse clearance is approximately 6 mm.
  • the locking device further comprises a portion 12 of reduced section of the housing L, located near the bottom thereof. More specifically, this portion 12 of reduced section is located at the lower end EI of the assembly A and its dimensions are substantially equal to those of this tip. Thus, the transverse displacement of the lower end EI of the assembly A is strongly limited in the lower part of the housing L.
  • the reduced section portion 12 of the housing L is embodied by overhanging portions formed on the adjacent side faces of the housing L opposite the two adjacent side faces intended to be turned downward during transport of the package.
  • the two faces of the housing L intended to be turned downwards when the assembly is in a horizontal position have recesses in their upper and lower parts, to the right of ES and EI tips. Therefore, given the slight difference in section between the end pieces and the current part of the assembly, the grids of the latter then come into contact with the two aforementioned faces of the housing, as shown in figure 1 .
  • This first embodiment of the invention relates to a fastening system 10 intended to be interposed between the upper nozzle ES1 of a fuel assembly A1 intended for a pressurized water nuclear reactor and a PT1 head plate materializing the end open a dwelling L1.
  • the upper end piece ES1 comprises in this case a lower solid plate P1, the square section defines the section of the assembly.
  • the upper end piece ES1 also comprises a top plate PS located above and away from the plate P1, when the assembly is oriented vertically.
  • the upper plate PS is recessed in its central portion and rigidly connected to the plate P1 by connecting parts not visible in the figures and located at the four corners of the tip ES1.
  • the housing L1 is formed in this case inside a tube T of square section, whose open upper end is fixed, for example by welding, in a hole TR of the same section, machined in the head plate PT1.
  • the fastening system 10 comprises a connecting member 14 adapted to be placed on the head plate PT1 so as to be centered on the hole TR made in it and on the recess of the plate upper PS of the upper end piece ES1 of the assembly.
  • the connecting member 14 comprises a flat bearing face 16 provided to be turned downwards when the assembly is oriented vertically.
  • the connecting member 14 is fixed on the head plate PT1 and the upper end piece ES1 of the assembly A1, as shown in FIG. figure 3 , the bearing face 16 is supported both on the upper face of the head plate and on the upper face of the tip.
  • centering fingers 18 protrude downwardly from the bearing face 16.
  • the centering fingers 18 penetrate holes formed in the upper plate PS of the upper end piece ES1, so as to ensure a centering of the connecting member 14 on this end piece (see figure 7 ).
  • the connecting member 14 supports, on its outer periphery, a ring 20 able to rotate freely about a longitudinal axis 22 of said member 14, oriented parallel to the housing axis L1 when the connecting member 14 is fixed thereon.
  • the ring 20 is provided externally with two lugs 24. These two lugs 24 are located in diametrically opposite locations.
  • two flanges 26 are fixed, for example by means of screws, on the upper face of the head plate PT1, at diametrically opposite locations on either side of the hole TR, on one of the diagonals of the square. formed in section by this hole.
  • the lugs 24 can be either engaged with the flanges 26, that is to say trapped between them and the upper face of the head plate PT1, or offset angularly with respect to said flanges 26.
  • the connecting member is secured to the plate PT1 head. Otherwise, the connecting member is disengaged from the head plate.
  • the arrangement thus formed forms a rigid connection of the "bayonet" type.
  • the connecting member 14 also supports a first control member 27, mounted to rotate about an axis parallel to the longitudinal axis 22.
  • the first member The control unit 27 is provided with an operating head 28. This makes it possible to control a rotation of the first control member 27 with the aid of a suitable tool.
  • the first control member 27 is integral with a pinion 30. This pinion 30 is engaged on a toothed sector 32 provided for this purpose inside the ring 20.
  • the arrangement that has just been described makes it possible to secure the connecting member 14 of the head plate PT or, on the contrary, to separate these two parts by controlling the rotation of the first control member 27 in one or the other. meaning using an appropriate tool.
  • the first control member 27, the ring 20 provided with its lugs 24 and the flanges 26 thus form means for making a rigid connection between the connecting member 14 and the open end of the housing L.
  • the connecting member 14 supports a second control member 34 disposed along its longitudinal axis 22 and able to rotate about said axis.
  • the second control member 34 is provided with an operating head 36. This allows to control a rotation of the second control member 34 using a suitable tool.
  • the second control member 34 comprises a thread 38.
  • a cylindrical piece 40 is engaged on this threading 38 by a tapping 42.
  • the cylindrical piece 40 is integral with a disc 44 centered on the longitudinal axis 22.
  • the disk 44 carries a toothing 46 at its periphery. This toothing 46 is engaged on a pinion 48, integral with a third control member 50 carried by the connecting member 14.
  • the third control member 50 is mounted on an axis parallel to the longitudinal axis 22 and able to rotate about said axis. At its accessible end on the upper face of the connecting member 14, the third control member 50 is provided with an operating head 52. This makes it possible to control a rotation of the third control member 50 by means of a suitable tool.
  • the cylindrical piece 40 is secured to a pin 54 whose axis is offset by relative to the longitudinal axis 22.
  • This pin 54 enters a cam groove 56 machined in a slider 58.
  • the slider 58 is itself mounted so as to slide in a tubular part 59.
  • Said tubular piece is supported by a tubular part 64 mounted on the cylindrical piece 40, so that the tubular member 59 is slidable along the longitudinal axis 22, while being immobilized in rotation about this axis.
  • the tubular member 59 projects downwardly within the recess formed in the top plate PS of the upper end piece ES1.
  • the slider 58 is able to move relative to the tubular part 59 in a direction orthogonal to the longitudinal axis 22 and oriented diagonally with respect to the square formed in section by the housing L1.
  • bearing surfaces 60 formed on pads 62 integral with the slider 58 may bear against the adjacent faces of the housing L1 opposite to those which must be oriented downwards when the packaging is transported in a horizontal position.
  • the arrangement which has just been described makes it possible, by acting on the third control member 50, to move the upper end piece ES1 of the assembly transversely towards said faces intended to be oriented downwards, by bearing on the faces opposed by the pads 62.
  • the control member 50 thus constitutes, with the cylindrical piece 40 and the slider 58, transverse displacement means of the upper end piece ES1 of the assembly.
  • This assembly is also part of the second clamping means, in that it allows to clamp laterally the connecting member 14 in the open end of the housing L1.
  • the cylindrical piece 40 coaxially supports the tubular piece 64. More specifically, the tubular piece 64 is mounted on the cylindrical piece 40, along the longitudinal axis 22, so as to rotate freely around said cylindrical piece 40 while being connected thereto in the direction of the longitudinal axis 22.
  • the tubular piece 64 In its upper part, located below the disc 44, the tubular piece 64 is integral with a disc 66, also centered on the longitudinal axis 22. On its outer periphery, the disc 66 is provided with a toothing 68. toothing 68 is engaged on a pinion 70, integral with a fourth control member 72 carried by the connecting member 14.
  • the fourth control member 72 is mounted on an axis parallel to the longitudinal axis 22 and able to rotate about said axis. At its accessible end on the upper face of the connecting member 14, the fourth control member 72 is provided with an operating head 74. This makes it possible to control a rotation of the fourth control member 72 by means of a suitable tool.
  • the tubular piece 64 is integral with a plate bearing a spiral toothing 76 on its face facing downwards. Said face is located in a plane perpendicular to the longitudinal axis 22.
  • each of the jaws 78 is mounted in the tubular part 59, so as to be able to slide parallel to the faces of the housing L1, towards said faces and away from them, in said tubular piece.
  • each of the jaws 78 has a spiral toothing which engages the spiral toothing 76 carried by the tubular piece 64.
  • each of the jaws 78 rotulatively supports a V (not illustrated) able to bear against the lower inner corner of the recess formed in the upper plate PS of the upper end piece ES1 of the assembly.
  • the fastening system 10 can be placed on the upper end piece ES1 of the assembly and separated therefrom, the races of the slide 58 and jaws 78 are sufficient for these parts to retract and allow the introduction of the connecting member 14 in the upper end piece ES through the recess formed in the upper plate PS.
  • the second control member 34 thus constitutes, with the thread 38 and the tapping 42, means for axial displacement of the assembly.
  • the heights of the teeth 46 and 68 of the disks 44 and 66, axially movable with the parts 40 and 64, and that of the teeth of the pinions 48 and 70, axially fixed with respect to the connecting member 14, are determined so that these teeth remain in continuous engagement.
  • the fastening system 10 is mounted on the upper end piece ES1 of the fuel assembly before it is introduced into its housing L1.
  • the slide 58 and the jaws 78 are first retracted in the connecting member 14 and the parts 40 and 64 are placed in the upper position relative to this connecting member.
  • the ring 20 is placed in the "unlocked" position.
  • the tubular piece 59 and the connecting member 14 are introduced into the recess of the plate upper PS of the upper tip ES1 until the bearing face 16 comes into contact with the upper face of this tip.
  • the fourth control member 72 is then actuated so as to bring the jaws 78 against the lower internal corners of the recess formed in the upper plate PS.
  • the fastening system 10 is then rigidly secured to the upper end piece ES1 of the assembly.
  • the assembly is then suspended from the fastening system 10, which thus makes it possible to safely carry out the handling of the assembly.
  • the fastening system 10 which is suspended assembly is then brought above the housing L1 and descended gradually.
  • the lower end EI is positioned in the transverse direction by the portion 12 of reduced section of the housing ( figure 1 ).
  • the bearing face 16 of the connecting member 14 bears on the upper face of the head plate PT1
  • the lower end EI remains spaced from the wedge C and the bottom F of the cavity.
  • the operator then actuates the third control member 50, so as to bring the pads 62 bearing against the two faces of the housing L1 provided to be turned upwards during the subsequent transport of the package ( figure 2 ).
  • the upper end piece ES1 is applied against the other two faces of the housing L1, intended to be turned downwards during transport. A transverse clamping of the upper end piece ES1 is thus carried out in the housing L.
  • the operator preferably applies a preset tightening torque, so as to perform a function of embedding the upper end piece ES1 in the housing L. This takes into account the accelerations likely to be encountered under normal conditions of transport.
  • the operator When the transport is finished, the operator first actuates the first control member 27, in order to separate the fastening system 10 from the head plate PT1.
  • the operator actuates the fourth control member 72, in order to separate the fastening system 10 from the upper end piece ES1.
  • the fastening system 10 can then be deposited, as illustrated by figure 4 , and the assembly unloaded from the transport packaging using tools commonly used in nuclear power plants.
  • This second embodiment of the invention relates to a fastening system 10 'intended to be interposed between the upper end piece ES2 of a fuel assembly A2 intended for a nuclear water reactor boiling and PT2 head plate materializing the open end of a housing L2.
  • the upper end piece ES2 of the assembly A2 comprises in this case a solid plate P2, forming a square view from above, to which is secured a loop AN forming an inverted U in side view.
  • the loop AN is located in a plane passing through a diagonal of the square and by the longitudinal axis of the assembly.
  • the housing L2 is delimited inside a tube T whose open upper end is welded in a hole TR machined in the head plate PT2.
  • the fastening system 10 comprises a connecting member 14' adapted to be placed on the head plate PT2 so as to be centered on the hole TR made in it and on the handle AN of the endpiece upper ES2 of the assembly.
  • the connecting member 14 ' is in the form of a square plate whose dimensions are substantially the same as those of the hole TR in which it is placed.
  • a single control member embodied by a screw 80, is anchored in the center of the connecting member 14 ', so as to protrude upwards when the fastening system 10' is placed on the housing L2 and when the latter it is oriented vertically. More specifically, the screw 80 is articulated on the connecting member 14 'by a ball 82. At its upper end, the screw 80 is provided with a control head 81 allowing its actuation using a suitable tool.
  • a nut 84 is engaged on the screw 80.
  • the first ends of two rods 86 are hinged to the nut 84 by a common axis, orthogonal to that of the screw 80.
  • the opposite ends of each of the rods 86 are articulated on the first ends of two control rods 88 by axes 90 parallel to the axis of articulation of the rods 86 on the nut 84.
  • Each of the control rods 88 is itself articulated on the connecting member 14 'by an axis 92 parallel to the axes 90. More specifically, the axes 92 are arranged symmetrically on either side of the ball 82.
  • the second end of each of the control rods 88, located below the connecting member 14 ', is articulated to the end of a push rod 94 by an axis 96, parallel to the axes 90 and 92.
  • the push rods 94 are supported by gravity on stop rods 98 secured to the connecting member 14 '. Their opposite ends can thus bear against the upper branch of the loop AN of the upper end piece ES2, as illustrated in particular by the figure 7 .
  • the rods 86, the control rods 88 and the push rods 94 are arranged in a plane passing through the longitudinal axis 22 'of the connecting member 14' and by a diagonal of the square formed in plan view by said member .
  • the thrust rods 94 thus form, at the same time, means for axially clamping the connecting member 14 'on the upper end piece ES2 of the assembly A2 and means for axial displacement thereof parallel to the longitudinal axis 22 'of the connecting member 14'.
  • the connecting member 14 supports two jaws 100 able to slide along the diagonal of the square that it forms in plan view. More specifically, the jaws 100 are located at the two opposite points of the aforementioned square. Each of them comprises a projecting portion 102, adapted to be placed in a housing 104 provided for this purpose at the entrance of the hole TR formed in the head plate PT2.
  • Two articulated links 106 connect the jaws 100 to each of the control rods 88, at a location thereof located between the axes 90 and 92.
  • the jaws 100 thus constitute means for axially clamping the connecting member 14 'on the PT head plate materializing the open end of the housing L2.
  • a damping element (not shown) is advantageously interposed between each link 106 and the jaw 100 corresponding thereto. This damping element allows the jaws 100 to perform their clamping function irrespective of the precise position in which the thrust rods 94 bring the upper leg of the handle AN against the underside of the connecting member 14 '.
  • two rigid protective plates 108 project downwards from two adjacent edges of the square plate forming the connecting member 14 '. More specifically, the protective plates 108 are arranged along the sides intended to be turned upward during the subsequent horizontal transport of the package. They extend down to the plate massive P2 of the upper end piece ES2 and the housing L2, when the fixing system 10 'is fixed in the upper part of a housing L2 containing an assembly A2.
  • Each of the protective plates 108 carries, on its face intended to be turned towards the interior of the housing L2, a leaf spring 110 provided with a support member 112 at its lower end. Part of this support element 112 is received between the protective plate 108 and the adjacent edge of the solid plate P2, when the fastening system 10 'is introduced into the upper part of a housing L2 containing an assembly A2. With the leaf spring 110, the support element 112 ensures the lateral displacement of the upper end of the assembly.
  • the arrangement which has just been described allows an operator to move the upper end piece ES2 of the assembly A2 towards the two faces of the housing L2 intended to be oriented downwards during the subsequent transport of the assembly in its packaging. in horizontal position.
  • a wedge-shaped pushing pad 114 is interposed between each protective plate 108 and the supporting element 112 corresponding thereto.
  • Each thrust pad 114 comprises a threaded hole in which is engaged a control screw 116.
  • This is mounted on the connecting member 14 'so as to be freely rotatable relative to it, while being connected. said organ parallel to its axis 22 '.
  • Each of the two control screws 116 comprises a control head 118 accessible above the connecting member 14 ', to enable their actuation by appropriate tools.
  • the thrust pads 114 thus constitute transverse clamping means of the upper end piece ES2 of the assembly in its housing L2.
  • the fastening system 10 is provided to be mounted in the top of the housing L2 while the assembly A2 has already been introduced therein. Therefore, the lower end of the assembly then rests on the shim C and on the bottom F of the cavity of the package.
  • the operator brings the fastening system 10 'above the assembly A2.
  • the fastening system is then in its unlocked position, that is to say that the nut 84 is in the lower position on the screw 80.
  • the ends of the push rods 94 are moved away from the underside. of the plate forming the connecting member 14 'and spaced from each other by a distance greater than the width of the loop AN.
  • the jaws 100 are retracted towards the center of the connecting member 14 '.
  • the lower end of the protective plates 108 enters the housing L2.
  • the upper branch of the loop AN is automatically centered by a drain 99 located in the lower part of the connecting member 14 '.
  • the support elements 112 mounted on the leaf springs 110 simultaneously provide a prepositioning of the upper end piece ES2 against the corner of the housing intended to be turned downward during the horizontal transport of the package.
  • a precise centering of the fastening system 10 'on the housing is then ensured by the embedding of the connecting member 14' on a complementary machining formed at the inlet of the hole TR of the head plate PT2.
  • the definitive positioning of the system is obtained when the connecting member 14 'bears on the head plate PT2.
  • the ends of the push rods 94 are thus placed under the upper branch of the handle AN and bring said arm bearing against the underside of the plate forming the connecting member 14 ', as shown in FIG. figure 7 .
  • the upper end piece ES2 of the assembly A2 is then secured to the connecting member 14 'and the lower end piece EI ( figure 1 ) is spaced from hold C and bottom F of the package.
  • the protruding portions 102 of the jaws 100 are received in the housings 104 of the head plate PT2, which has the effect of securing it to the connecting member 14 '.
  • This third embodiment of the invention relates to a fastening system 10 "intended to be interposed between the upper end piece ES3 of a fuel assembly A3 intended for a pressurized water nuclear reactor and a PT3 head plate materializing the open end of a housing L3.
  • the upper tip ES3 of the assembly A3 comprises in this case a lower solid plate P3, forming a square view from above.
  • the upper end piece ES3 also comprises a top plate PS located above and at a distance from the solid plate P3, when the assembly is oriented vertically.
  • the upper plate PS is recessed in its central portion and rigidly connected to the plate P3 by junction pieces PJ located at the four corners of the tip.
  • the housing L3 is formed as previously inside a tube T of square section, whose open upper end is fixed, for example by welding, in a hole TR of the same section, machined in the head plate PT3.
  • the fastening system 10 "comprises a connecting member 14" adapted to be placed on the head plate PT3 so as to be centered on the hole TR formed therein by means of unrepresented guide pins.
  • Clamping means such as screws 119 are provided to ensure a rigid connection between the connecting member 14 "and the head plate PT3 when the screws are put in place.
  • the connecting member 14 is provided with posts 121 projecting downwardly, for simplicity only one of these posts 121 is shown on FIG. figure 10 .
  • the lower faces of these columns 121 form abutment surfaces adapted to bear on the upper face of the upper plate PS of the upper end piece ES3 of the assembly.
  • a single control member 120 is rotatably supported in the center of the connecting member 14 ", while being immobilized on said member parallel to its axis 22". At its upper end, the single control member 120 is provided with an actuating head 122 allowing its actuation using a suitable tool.
  • the single control member 120 In its lower part, located below the connecting member 14 ", the single control member 120 comprises a thread 124 on which is engaged a nut 126. Said nut 126 is immobilized in rotation relative to the member 14 ", so that a rotation of the single control member 120 has the effect of controlling a displacement of the nut 126 upwards or downwards, parallel to the axis 22 ".
  • claws 128 are articulated on the nut 126 by their upper ends. This articulation is provided by pivot axes 130 oriented in directions orthogonal to the axis 22 "of the connecting member 14". More precisely, the axes of pivoting of the claws 128 are all arranged in the same plane perpendicular to the axis 22 ", equidistant from it, Moreover, the pivot axes 130 of the claws 128 arranged on both sides other of the longitudinal axis 22 "are parallel to each other and orthogonal to the pivot axes 130 of the two other claws 128.
  • each of the claws 128 includes a bent portion 140, which protrudes substantially at right angles outwardly.
  • two adjacent claws 128 are provided with support rollers 142.
  • these rollers 142 equip the claws 128 intended to come into contact with the inner faces of the portions of the recessed upper plate PS which they will be applied against the faces of the housing L3 intended to be turned downwards during the subsequent transport of the packaging in a horizontal position.
  • each of the claws 128 further comprises, on its side facing the longitudinal axis 22 ", a lug 132 placed above an abutment rod 134 integral with the connecting member 14".
  • a torsion spring 136 is wound around each of the pivot axes 130 and is supported both on a rod 138 integral with the nut 126 and the corresponding claw 128, so as to apply a lateral force on the tip.
  • the lugs 132 of the claws 128 not equipped with rollers 142 are terminated by a stop 133 intended to bear against a surface 127 of the nut 126, when the bent portions 140 of the claws 128 are placed under the plate upper PS of the upper tip ES3.
  • Lateral displacement of the upper end piece ES3 towards the two required faces of the housing L can thus be ensured by the two claws 128 provided with rollers 142, under the action of the lateral forces exerted on said endpiece by the springs 136.
  • the single control member 120 makes it possible to control the pivoting of the claws 128 which form at the same time means for clamping the connecting member 14 "on the upper end piece ES3 of the assembly and axial displacement means of the assembly along the longitudinal axis 22 ".
  • the springs 136 form transverse displacement means of the upper end piece ES3 towards the corner of the housing L3 intended to be turned downwards when the packaging is transported horizontally.
  • an actuation of the single control member 120 has the effect of spreading the claws 128, to move them upwards along the axis 22 "and to position the bent portions 140 under the upper plate PS.
  • the two rollers 142 first come into contact with the corresponding inner faces of the recess of the upper plate PS of the upper nozzle ES3.
  • a transverse displacement of this endpiece to the aforementioned lower corner of the housing L3 is then obtained through the springs 136.
  • the bent portions 140 of the claws 128 then bear against the upper plate PS, which has the effect of lifting the assembly in his dwelling.
  • the upper plate PS is brought into abutment against the lower faces of the columns 121 carried by the connecting member 14 ", which has the effect of securing this member of the upper end piece ES3 of the assembly.
  • the fastening system 10 is provided to be mounted in the top of the housing L3 while the assembly A3 has already been introduced into it.Therefore, the lower end of the assembly then rests on the hold C and on the bottom F of the package.
  • the fastening system 10 is introduced into the upper part of the housing L3 as illustrated by FIG. figure 12 and centered on the PT3 head plate with pins (not shown).
  • the connecting member 14 is then secured to the head plate PT3, for example by means of the screws 119.
  • the rollers 142 come into contact with the two corresponding faces of the recess formed in the upper plate PS, which has the effect of applying the upper end piece ES3 against the aforementioned lower angle of the housing L3 ( figure 13 ).
  • control member 120 has the effect of lifting the assembly A3 and bringing the upper plate PS against the lower faces of the columns 121 carried by the connecting member 14 ", as illustrates it figure 14 .
  • the operator actuates in the opposite direction the single control member 120. This maneuver results in the descent of the nut 126 and the claws 128. The latter are progressively released from the upper end piece ES3 of the assembly, which is then placed on the wedges C ( figure 1 ). When the claws 128 are sufficiently retracted, the fastening system 10 "is removed.
  • the method and the device according to the invention thus make it possible to form a rigid connection between the upper end of the assembly and the open end of the housing, whatever the type of assembly that it is desired to transport.
  • This particularly simple arrangement leads to a substantially reduced space requirement in the transverse direction, with respect to the locking devices of the prior art.
  • this housing can in particular belong to an assembly transport device, a storage basket in a pool or a fuel assembly storage area, provided in any facility.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Packaging Of Machine Parts And Wound Products (AREA)
  • Automatic Assembly (AREA)

Claims (10)

  1. Transportbehälter für mindestens ein Brennelement (A1, A2, A3) mit polygonalem Querschnitt, mit einem oberen Anschlussstück (ES1, ES2, ES3) und einem unteren Anschlussstück (EI1, EI2, EI3), wobei der Behälter eine Kopfplatte (PT), an der ein offenes Ende von mindestens einer Rohrwand (T) befestigt ist, die ein Gehäuse (L1, L2, L3) definiert, das einen polygonalen Querschnitt einer zu der des Elements identischen Form aufweist und das zur Aufnahme eines einzigen Brennelements geeignet ist und eine Arretierungsvorrichtung des Brennelements in seinem Gehäuse umfasst, dadurch gekennzeichnet, dass die Arretierungsvorrichtung ein einziges Befestigungssystem (10) umfasst, wodurch eine feste Verbindung zwischen dem oberen Anschlussstück (ES1, ES2, ES3) des Brennelements und der das offene Ende des Gehäuses bildenden Kopfplatte (PT) in einer relativen vorgegebenen Position derart, dass das obere Anschlussstück des Brennelements in direktem Kontakt mit zwei benachbarten Flächen des Gehäuses steht und derart, dass das Brennelement durch dessen oberes Anschlussstück aufgehängt ist, wenn das Gehäuse im wesentlichen vertikal ausgerichtet ist, realisiert werden kann, wobei das Befestigungssystem insgesamt oberhalb des oberen Anschlussstücks des Elements plaziert ist und ein Verbindungsorgan (14, 14', 14") umfasst, das am oberen Anschlussstück des Brennelements durch erste Einspannmittel fixiert werden kann, wobei das Verbindungsorgan erste Verschiebungsmittel (58, 114, 142), die zur Verschiebung des oberen Anschlussstücks des Brennelements in einer Querrichtung in Bezug auf das Gehäuse zu zwei benachbarte Flächen des Gehäuses hin und unter Entfernen von diesen fähig sind, und zweite Verschiebungsmittel (38, 42, 94, 140), die zur Verschiebung des Brennelements in axialer Richtung in Bezug auf das Gehäuse unter Entfernen vom zweiten Ende (F) des Gehäuses und zum zweiten Ende hin fähig sind, kraftschlüssig verbunden enthält.
  2. Transportbehälter nach Anspruch 1, wobei das Brennelement (A1, A2, A3) und das Gehäuse (L1, L2, L3) quadratische Querschnitte aufweisen.
  3. Transportbehälter nach einem der vorhergehenden Ansprüche, wobei die Arretierungsvorrichtung ferner ein Teil mit vermindertem Querschnitt (12) des Gehäuses (L1, L2, L3), das sich nahe dem zweiten Ende desselben befindet, umfasst, wobei das Teil mit vermindertem Querschnitt Abmessungen aufweist, die im wesentlichen gleich denjenigen des unteren Anschlussstücks (EI) des Brennelements sind.
  4. Transportbehälter nach einem der vorhergehenden Ansprüche, wobei das Verbindungsorgan (14, 14', 14") im offenen Ende des Gehäuses (L1, L2, L3) durch zweite Einspannmittel (24, 26, 262, 102, 104, 119) fixiert werden kann.
  5. Transportbehälter nach einem der vorhergehenden Ansprüche, wobei die ersten Einspannmittel (78), die zweiten Einspannmittel (24, 26) die ersten Verschiebungsmittel (58) und die zweiten Verschiebungsmittel (38, 42) durch verschiedene Antriebsorgane (72, 27, 50, 34), die getrennt gesteuert werden können, betätigt werden.
  6. Transportbehälter nach Anspruch 5, wobei das Verbindungsorgan (14) eine Längsachse (22) aufweist, die parallel zur Längsachse des Brennelements (A1) ausgerichtet werden kann, wobei die ersten Einspannmittel Backen (78), die in einem ersten Teil (64) des Verbindungsorgans in im wesentlichen radialen Richtungen in Bezug auf die Längsachse dieses Organs verschoben werden können, umfassen, und die zweiten Einspannmittel eine Bajonettkrone (20), die in einem zweiten Teil des Verbindungsorgans (14) um die Längsachse dieses Organs gedreht werden kann, umfassen, die ersten Verschiebungsmittel Mittel (38, 42) zum Antreiben einer relativen Verschiebung zwischen dem ersten Teil und dem zweiten Teil längs der Längsachse des Verbindungsorgans umfassen, und die zweiten Verschiebungsmittel mindestens ein Gleitstück (58), das in dem ersten Teil (64) des Verbindungsorgans in einer im wesentlichen radialen Richtung in Bezug auf die Längsachse dieses Organs verschoben werden kann, umfassen, wobei das Gleitstück auch ein Teil der zweiten Einspannmittel bildet.
  7. Transportbehälter nach einem der vorhergehenden Ansprüche, wobei die ersten Einspannmittel (94), die zweiten Einspannmittel (102) und die zweiten Verschiebungsmittel (94) durch ein einziges Antriebsorgan betätigt werden und die ersten Verschiebungsmittel (114) durch ein anderes Antriebsmittel (116), das getrennt vom einzigen Antriebsorgan gesteuert werden kann, betätigt werden.
  8. Transportbehälter nach Anspruch 7, wobei das einzige Antriebsorgan (80) eine Schraube ist, die drehbar an dem Verbindungsorgan (14') verankert ist, wobei die Schraube auf Schubstangen (94), die gleichzeitig die ersten Einspannmittel und die zweiten Verschiebungsmittel bilden, wirkt und auf Backen (100), die die zweiten Einspannmittel bilden, mittels Antriebsstangen (86, 88, 106), die mit dem Verbindungsorgan (14'), einer mit der Schraube in Eingriff stehenden Mutter (84), den Schubstangen (94) den Backen (100) beweglich verbunden sind, wirkt, und die ersten Verschiebungsmittel Gleitschuhe (114), die an dem Verbindungsorgan (14') verankert sind, umfassen.
  9. Transportbehälter nach einem der vorhergehenden Ansprüche, wobei die ersten Einspannmittel (140), die ersten Verschiebungsmittel (142) und die zweiten axialen Verschiebungsmittel (140) durch ein einziges Antriebsorgan (120) betätigt werden, und die zweiten Einspannmittel ein getrenntes Befestigungsorgan umfassen.
  10. Transportbehälter nach Anspruch 9, wobei das einzige Antriebsorgan (120) eine Schraube ist, die drehbar an dem Verbindungsorgan (144") verankert ist, wobei die Schraube mittels einer mit der Schraube in Eingriff stehenden Mutter (126), mit der die Greifer beweglich verbunden sind, auf die Greifer (128) wirkt, die gleichzeitig die ersten Einspannmittel, die ersten Verschiebungsmittel und die transversalen Verschiebungsmittel bilden.
EP02808356A 2002-12-19 2002-12-19 Vorrichtung zum Transportieren von Kernbrennelementen Expired - Lifetime EP1573750B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FR2002/004459 WO2004066313A1 (fr) 2002-12-19 2002-12-19 Procede et dispositif de blocage d'un assemblage combustible nucleaire dans un logement

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EP1573750A1 EP1573750A1 (de) 2005-09-14
EP1573750B1 true EP1573750B1 (de) 2009-04-08

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EP (1) EP1573750B1 (de)
JP (1) JP4291277B2 (de)
AU (1) AU2002365009A1 (de)
DE (1) DE60231922D1 (de)
WO (1) WO2004066313A1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
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US12033764B2 (en) 2006-09-06 2024-07-09 Holtec International Fuel rack for storing spent nuclear fuel
US8576976B2 (en) * 2007-10-29 2013-11-05 Holtec International, Inc. Apparatus for supporting radioactive fuel assemblies and methods of manufacturing the same
US11515054B2 (en) 2011-08-19 2022-11-29 Holtec International Method of retrofitting a spent nuclear fuel storage system
US9748009B2 (en) * 2011-08-19 2017-08-29 Holtec International Container and system for handling damaged nuclear fuel, and method of making the same
RU2511118C1 (ru) * 2013-01-23 2014-04-10 Федеральное государственное унитарное предприятие "Горно-химический комбинат" Захват для подъема и перемещения корпуса ампулы с пучком отработавших тепловыделяющих элементов
CN103996420B (zh) * 2014-04-16 2016-12-07 中国核电工程有限公司 一种采用楔形块自锁的燃料组件抓具

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FR2417828A1 (fr) * 1978-02-17 1979-09-14 Framatome Sa Outil de permutation et de transport de capsules d'irradiation d'un reacteur nucleaire
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FR2674668B1 (fr) * 1991-03-25 1993-07-16 Framatome Sa Dispositif de fixation d'un objet sur une structure de transport et en particulier dispositif de verrouillage d'un assemblage combustible dans un conteneur.
FR2674667B1 (fr) * 1991-03-25 1994-09-02 Framatome Sa Dispositif de fixation d'un objet sur une structure de transport et en particulier dispositif de verrouillage d'un assemblage combustible dans un conteneur de transport.
JP3516978B2 (ja) * 1994-04-15 2004-04-05 株式会社東芝 燃料集合体輸送容器
US5481117A (en) * 1994-09-01 1996-01-02 Westinghouse Electric Corporation Shipping container for a nuclear fuel assembly
FR2737598B1 (fr) * 1995-08-04 1997-10-03 Reel Sa Dispositif pour le transport et le stockage d'assemblages combustibles nucleaires
US6108392A (en) * 1997-01-21 2000-08-22 Kabushiki Kaisha Toshiba Fuel assembly transport container and method of transporting a fuel assembly
FR2760562B1 (fr) * 1997-03-05 1999-05-28 Toshiba Kk Appareils et procede de protection et de transport d'ensembles combustibles nucleaires
US6169777B1 (en) * 1997-07-04 2001-01-02 Kabushiki Kaisha Toshiba Fuel transport container and method of transporting a fuel assembly

Also Published As

Publication number Publication date
WO2004066313A1 (fr) 2004-08-05
EP1573750A1 (de) 2005-09-14
JP4291277B2 (ja) 2009-07-08
DE60231922D1 (de) 2009-05-20
AU2002365009A1 (en) 2004-08-13
JP2006511811A (ja) 2006-04-06
US20080049886A1 (en) 2008-02-28

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