EP0051314A1 - Procédé pour réduire la longueur d'au moins un barreau de combustible irradié, enveloppe pour la mise en oeuvre du procédé et dispositif de confinement du barreau de combustible de longueur réduite - Google Patents

Procédé pour réduire la longueur d'au moins un barreau de combustible irradié, enveloppe pour la mise en oeuvre du procédé et dispositif de confinement du barreau de combustible de longueur réduite Download PDF

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Publication number
EP0051314A1
EP0051314A1 EP81109485A EP81109485A EP0051314A1 EP 0051314 A1 EP0051314 A1 EP 0051314A1 EP 81109485 A EP81109485 A EP 81109485A EP 81109485 A EP81109485 A EP 81109485A EP 0051314 A1 EP0051314 A1 EP 0051314A1
Authority
EP
European Patent Office
Prior art keywords
fuel rod
tube
deformation element
length
deformation
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.)
Withdrawn
Application number
EP81109485A
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German (de)
English (en)
Inventor
Heinz Ing.Grad. Bienek
Wolfgang Dipl.-Ing. Von Heesen
Wilhelm Dr.-Ing. Wick
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.)
Steag Kernenergie GmbH
Original Assignee
Steag Kernenergie GmbH
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 Steag Kernenergie GmbH filed Critical Steag Kernenergie GmbH
Publication of EP0051314A1 publication Critical patent/EP0051314A1/fr
Withdrawn legal-status Critical Current

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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
    • G21F9/34—Disposal of solid waste
    • G21F9/36—Disposal of solid waste by packaging; by baling

Definitions

  • the invention relates to a method for reducing the length of at least one irradiated fuel rod, in which the spring rod is first introduced into an enclosing tube and then deformed to reduce the rod length of the fuel rod.
  • the spent fuel rods are introduced individually or in groups into a flattened steel encasing tube and then the encasing tube is welded in a gas-tight manner.
  • the encasing tube is welded in a gas-tight manner.
  • two fuel rods are placed in each containment tube.
  • the fuel rods welded into the metallic containment tubes are wound around a mandrel to form a spiral, the diameter of which depends on the smallest allowable bending radius of the containment tube.
  • the nuclear fuel which is preferably in pellet form, breaks into fragments and the cladding tubes of the fuel rods, which envelop the nuclear fuel, tear open. Since the containment tubes remain gas-tight during the deformation caused by the winding, due to the properties of the material used, they retain the radioactive substances and / or gases which are released when the fuel rod is deformed. In some applications, the gas pressure of the gas in the fuel rod is around 80 bar. The lower pressure which arises after deformation in the sheathing tube depends on the empty volume enclosed by the sheathing tube.
  • the length of the individual fuel rod is reduced, but the deformation leads to spirals with large diameters and to large dead spaces, which are determined by the cylindrical mandrel volume in the middle of the wound fuel rods.
  • the large outer diameters of the wound fuel rods complicate the use of certain ceramic packaging materials for packaging into which the deformed fuel rods located in the sheathing tube are to be packaged, since these packages are made of the ceramic materials in the dimensions required then only in a technically complex manner or not at all have it made.
  • the large dead spaces determine a small usable volume of the packaging.
  • At least one deformation element covering the fuel tube in a sleeve-like manner, gas-tightly connected to the containment tube and remaining gas-tight under deformation is assigned to the containment tube and that the fuel rod is bent by essentially 180 ° in the deformation area determined by the deformation element. wherein the deformation element is deformed in accordance with the kink and the enclosing tube remains essentially rectilinear.
  • the fuel rod is always at one or more locations substantially 180 0 extent that the rectilinearly remaining when using a deformation element portions of the confining tube pairs are placed substantially in parallel position, and almost come into contact with each other.
  • the fuel rod is either split up when kinking or it is at least partially broken up before kinking.
  • a preferred embodiment of the partial division can be seen in the flattening of the deformation element and the fuel rod before the buckling in the deformation area. This pre-deformation the deformation element is preferably carried out by rolling or pressing.
  • the enclosing tube is designed with a constant cross-sectional configuration over substantially its entire length and ensures a gas-tight buckling deformation, and the fuel rod and the wrapping tube are bent into a predetermined length section serving as a deformation element.
  • a sheath tube which is substantially over its entire length has a constant cross-sectional configuration, but is performed at least one buckling by substantially 180 0 such that a straight line remaining Umsch widelyungsrohrabismee come together in abutment.
  • Austenitic steel is preferably used as the material for such a cladding tube with integrated bend deformability.
  • the invention is also directed to a casing for carrying out the method according to the invention.
  • the sheathing is characterized in that at least one deformation element is assigned to the encasing tube, which covers a fuel rod section of a predetermined partial length in a sleeve-like manner, is connected in a gastight manner to the encasing tube and remains gas-tight when the fuel rod is bent.
  • the deformation element can be realized in different ways.
  • the deformation element is preferably pushed onto the enclosing tube and connected to it in a gastight manner.
  • the deformation element can with the Enclosure tube, for example, welded, soldered or glued.
  • the connection can be established over the entire axial length of the deformation element or can be formed only at its end regions.
  • the deformation element can also be expedient for the deformation element to be arranged between sections of the enclosing tube and to be connected in a gastight manner to the facing ends of the enclosing tube.
  • the connection techniques mentioned above are also suitable here. Of course, it must be ensured that the connections remain gas-tight when buckling.
  • integrally forming the deformation element with the sheathing tube there is the possibility of integrally forming the deformation element with the sheathing tube.
  • the deformation element can be designed in such a way that it is deformed plastically or elastically or plastically-elastically during mechanical bending by the forces applied from the outside.
  • the deformation element is formed in one piece with the sheathing tube - but also if the deformation element is manufactured separately - the deformation element can have a greater wall thickness in the area of greater material stretching than in the area of smaller material stretching.
  • the sheathing is particularly expedient and easy to manufacture if the deformation element has a cross-sectional configuration that is constant over its length and ensures a gas-tight buckling deformation, and the cross-sectional configuration of the sheathing tube is equal to that of the deformation element, i.e. the cross-sectional configuration of the Cladding tube corresponds substantially to the entire length of the sheath tube of a gas-tight buckling strain 180 0-locking cross-sectional configuration.
  • FIG. 1 a shows a section of a fuel rod 1, which usually consists of a cladding tube 2 and fuel 3 introduced into the cladding tube in the form of fuel pellets, as indicated in FIG. 1 a below.
  • the fuel rod 1 is shown as a solid rod in order to facilitate understanding of the actual invention.
  • the fuel rod 1 is inserted into an enclosing tube 4, the ends of which are sealed gas-tight.
  • a deformation element 5 is pushed onto the enclosing tube 4 and connected to the surface of the enclosing tube in a gas-tight manner by welds 7 applied to the ends of the deforming element.
  • the deformation element is provided with a thicker outer wall in the area of the larger material stretching during buckling than in the area of smaller material stretching, so that after buckling a minimum wall thickness in the area greater material stretch is present.
  • the deformation element 5 is curved in the manner shown in Figure la, so that a cavity 6 is formed between the deformation element 5 and the enclosing tube 4, whereby the necessary elongation of the material is reduced.
  • the encircling tube 4 according to FIG. 1 a is placed approximately in the middle of the deformation element 5 on a mandrel 8 shown in section in FIG. 1 c and bent over this mandrel of small diameter to such an extent that the two legs 4 'and. 4 '' of the enclosing tube lie parallel to each other.
  • the one after pulling out The dead space remaining in the deformation mandrel is negligibly small in comparison to the volume of the enclosing tube.
  • the deformation element 9 is arranged between pieces 4'u.4 "of the enclosing tube 4 and is gas-tightly connected by welding 7 to the facing ends of the two sections of the enclosing tube 2c in order to carry out the mechanical buckling, the deformation element 9 is deformed by means of two rollers lo and lo 'in the manner shown in FIG. 2a in the region of the kink with the enclosed fuel rod, the cladding tube and the structure of the ceramic fuel The change in cross-section by the two rollers lo and lo 'takes place in such a way that the fiber to be stretched for bending is shifted towards the neutral fiber in such a way that the elongation of the fiber is minimal during the bending process.
  • a cross-sectional change of the deformation element can e.g. also done by pressing. The only thing that matters is to shift the fibers to be stretched towards the neutral fibers.
  • protective plates 11 and 12 can be provided on the inner surface of the deformation element 9 be provided in the arrangement shown in FIG. 2e, which prevent the contact of fuel bodies under the deformation pressure with the deformation element when the cross section is changed by external forces.
  • the pre-deformation described can of course also be carried out with a deformation element formed in one piece with the sheathing tube; but also with a sheathing tube, the cross-sectional configuration of which is adapted over its entire length to the buckling process or processes.
  • the deformation element 13 consists of a welded 7 with two sections 4 'u. 4 "of the sheath tube connected with an approximately central predetermined breaking point 14a and a compensator 15 connected to the sleeve in a gas-tight manner and enclosing the predetermined breaking point, which has a depression or other marking 15a for identifying the predetermined breaking point 14a
  • the ends of the compensator 15 are connected to the predetermined breaking sleeve 14 by means of welds 16.
  • the compensator consists of a section 15b which is subjected to a plastic deformation during the bending process and a section which is essentially subjected to an elastic deformation during the bending process Section 15c
  • the two sections 15b and 15c of the compensator 15 are formed in one piece with one another.
  • the deformation element 13 When buckling, the deformation element 13 is placed in the region of the depression 15a on a buckled edge 8 'shown in dashed lines and buckled around it.
  • the fuel rod is divided by the reinforced portions of the predetermined breaking sleeve 14 at the predetermined breaking point 14a.
  • the compensator 15 ensures that the kink is secured against gas leakage.
  • the approximately larger dead space that occurs as a result of the larger diameter of the two sections 4'u.4 '' of the enclosing tube is still negligibly small and can be reduced by selecting the appropriate material for the predetermined breaking sleeve by reducing the wall thickness.
  • the deformation element 17 has two sleeves 18 and 19, which are located coaxially opposite one another.
  • Shear rings 2o and 21, which determine shear edges 2oa, 21a, are introduced into recesses at the opposite ends.
  • An elastically deformable compensator 22 is connected to the two mutually opposite sleeves 18 and 19 in a manner comparable to that in FIG.
  • the two shear sleeves are first shifted against each other in such a way that the fuel rod is divided (see FIG. 4b), the two sections are separated from one another (see FIG. 4c) and bent until they assume the position shown in FIG. 4d .
  • the term “buckling” is also understood to mean such a process in which when the 180 ° pivoting movement is carried out the two Fuel rod sections are no longer connected.
  • a deformation element 23 is used, which is also connected to sections 4 ′ or 4 ′′ of the sheathing tube 4 via welds 7.
  • the deformation element 23 here has the shape of a compensator, which is comparable to the compensator according to FIG. 3 and thus also consists of two sections 23a and 23b, the section 23b being essentially plastically deformable, as the transition from FIG. 5a to 5c clearly shows.
  • the two compensator sections can be formed in one piece with one another or separately from one another, in which case both sections must of course be connected to one another in a suitable manner (e.g. welding).
  • a section 23c is assigned to the essentially elastically deformable section 23b in the manner shown in FIG. 3 and carries a straight separating wedge 24 directed inwards (cf. FIG. 5d).
  • a crescent-shaped dividing wedge can also be used.
  • a separating wedge abutment 23d is formed, on which the fuel rod is supported.
  • the separating wedge 24 is loaded by a stamp 25 acting on the compensator from the outside, so that it is pressed into the cladding tube 2 of the fuel rod and into the fuel 3 of the fuel rod 1. This will completely split the fuel rod or weakened at the intended kink point so that it is divided during the subsequent kinking.
  • the compensator 23 ensures a gas-tight enclosure of the kink during the separation and kinking process.
  • the sleeves 14 or 18 and 19 can also be formed in one piece with the sheathing tube 4.
  • a compensator in the form of a corrugated metal hose can also be used, as the compensator according to FIG. 4 has.
  • the compensator when using a compensator, the compensator as a whole or its elastically deformable sections can be pre-shaped like a bellows to impress the elastic deformability.
  • Steels are particularly suitable for achieving elastic shape behavior.
  • tough metallic materials are used which have a high elongation at break behavior.
  • FIG. 6a shows three sheathing tubes of the embodiment according to FIG. 4, each deformed by a kink.
  • the free ends of the two sections 4'u.4 '' are each closed by a closure cover 26 which is connected gas-tight to the associated section, for example welded .
  • An attachment for a manipulator is provided on the free end face of the cover.
  • the fuel rods reduced in length by the one kink have been brought into a U-shape.
  • the deformation elements 22 of the individual layers each lie on one side of the layer, while the straight-line sections 4'u.4 "of one layer touch the sections of the other layer in the manner shown in FIG. 6, the checkered gussets remaining between the pipe sections, which, however, represent a very small dead space compared to the volume of the cladding tubes.
  • FIGS. 7a and 7b A bearing arrangement is described in FIGS. 7a and 7b, as can be achieved with simply bent fuel rods according to FIG. 2.
  • a packing density which is hexagonal in section is achieved.
  • the gussets are only triangular. In this arrangement too, the deformation elements of a layer lie on one and the same side of the layer.
  • FIG. 8a shows the side view of a double-bent jacket tube 4 according to FIG. 2.
  • Two deformation elements 9 are therefore welded into the sheathing tube, so that it consists of the sections 4 ', 4' 'and 4' ''.
  • the deformation elements 9 have each been rolled such that the directions of buckling are not identical, but rather are oriented so that when buckling the configuration shown in FIG .4 '' 'essentially define an equilateral triangle with a plane perpendicular to them.
  • An essentially hexagonal packing configuration can also be achieved with fuel rods bent in this way.
  • FIG. 9 shows a double-folded envelope tion tube, in which two deformation elements 9 according to FIG. 2 are switched on.
  • the deformation elements 9 are rolled in such a way that the bearing arrangement shown in FIG. 9b can be reached, in which the bent fuel rods can be arranged like a ring.
  • rods can be introduced, for example, which are bent according to FIG. 8, so that an essentially hexagonal packing density can also be achieved here.
  • the bearing arrangements shown in FIGS. 6-9 can also be achieved with the other deformation elements.
  • the separately or integrally formed deformation elements with a pre-embossed kink direction must of course be aligned in a predetermined manner when they are applied to the encasing tube, when they are switched on in the encasing tube or when they are formed in the encasing tube.
  • the deformation elements preferably have an impressed direction of buckling.
  • the kinking of the fuel rods in a sheath with integrated kink deformability enables the wrapped fuel rods to be packaged in containers in such a way that there is essentially no dead space left in the container, since a hexagon-shaped cross section essentially perpendicular to the straight sections of the fuel rods remains. Packing density can be achieved. In this way, ceramic containers with small internal dimensions can be used.

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
EP81109485A 1980-11-03 1981-11-02 Procédé pour réduire la longueur d'au moins un barreau de combustible irradié, enveloppe pour la mise en oeuvre du procédé et dispositif de confinement du barreau de combustible de longueur réduite Withdrawn EP0051314A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3041220 1980-11-03
DE3041220 1980-11-03
DE3138880 1981-09-30
DE19813138880 DE3138880A1 (de) 1980-11-03 1981-09-30 Verfahren zur laengenreduzierung mindestens eines bestrahlten brennstabs und umhuellung zur durchfuehrung des verfahrens

Publications (1)

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EP0051314A1 true EP0051314A1 (fr) 1982-05-12

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EP81109485A Withdrawn EP0051314A1 (fr) 1980-11-03 1981-11-02 Procédé pour réduire la longueur d'au moins un barreau de combustible irradié, enveloppe pour la mise en oeuvre du procédé et dispositif de confinement du barreau de combustible de longueur réduite

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EP (1) EP0051314A1 (fr)
DE (1) DE3138880A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2722472A1 (de) * 1976-05-25 1977-12-15 Novatome Ind Verfahren zur einlagerung von nuklearabfaellen, die als feststoffschuettung anfallen
DE2818781A1 (de) * 1977-05-10 1978-11-23 Asea Ab Verfahren zur umweltsicheren lagerung von verbrauchten radioaktiven kernbrennstaeben
US4170817A (en) * 1978-05-02 1979-10-16 The United States Of America As Represented By The United States Department Of Energy Method and means of packaging nuclear fuel rods for handling

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2722472A1 (de) * 1976-05-25 1977-12-15 Novatome Ind Verfahren zur einlagerung von nuklearabfaellen, die als feststoffschuettung anfallen
DE2818781A1 (de) * 1977-05-10 1978-11-23 Asea Ab Verfahren zur umweltsicheren lagerung von verbrauchten radioaktiven kernbrennstaeben
US4170817A (en) * 1978-05-02 1979-10-16 The United States Of America As Represented By The United States Department Of Energy Method and means of packaging nuclear fuel rods for handling

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Elektrotechnik, Jahrgang 60, No. 4, Februar 1978 "Fortschritte bei der Kapselung von Kernbrennstoffabfall" * figur 1 * *

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DE3138880A1 (de) 1982-07-22

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Inventor name: VON HEESEN, WOLFGANG, DIPL.-ING.

Inventor name: BIENEK, HEINZ, ING.GRAD.

Inventor name: WICK, WILHELM, DR.-ING.