EP1700315B1 - Einrichtung und verfahren zur packung von kernbrennstoffbaugruppen mit doppel-eingrenzungsbarriere - Google Patents

Einrichtung und verfahren zur packung von kernbrennstoffbaugruppen mit doppel-eingrenzungsbarriere Download PDF

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Publication number
EP1700315B1
EP1700315B1 EP04805791A EP04805791A EP1700315B1 EP 1700315 B1 EP1700315 B1 EP 1700315B1 EP 04805791 A EP04805791 A EP 04805791A EP 04805791 A EP04805791 A EP 04805791A EP 1700315 B1 EP1700315 B1 EP 1700315B1
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EP
European Patent Office
Prior art keywords
receptacle
leak tight
passage
outer receptacle
container
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Not-in-force
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EP04805791A
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English (en)
French (fr)
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EP1700315A2 (de
Inventor
René CHIOCCA
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TN International SA
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TN International SA
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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
    • G21F5/005—Containers for solid radioactive wastes, e.g. for ultimate disposal
    • G21F5/008—Containers for fuel elements
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to the conditioning of nuclear fuel assemblies and more particularly to the devices allowing double confinement of the assemblies, as well as to the packaging procedure in the containers before a possible transport or storage.
  • Nuclear fuel assemblies require special procedures for their use, transportation, and even as waste. Thus, after use, irradiated nuclear fuel assemblies from nuclear power plants must be stored. Nuclear power plants have a pool in which these assemblages are stored, but this storage is temporary, and the nuclear fuel assemblies must then be evacuated to storage sites that are said to be "definitive or temporary", including in particular sealed metal enclosures protected by concrete storage modules.
  • the metal container essentially comprises a hollow tubular body, of generally cylindrical shape with circular section, provided with a closed lower end and a fully open upper end.
  • second confinement an additional confinement, hereinafter called “second confinement”, is necessary in addition to the confinement provided by the sealed metal container: an additional double enclosure must be put in place.
  • Some legislations impose besides this double enclosure. In this case, the packaging under water is not operational so far, because of the drainage problems of the second containment in particular.
  • the invention proposes to solve the problems inherent in the drainage of double containers.
  • the invention relates to a device for double containers which allows, thanks to its geometry, to ensure drainage and an inert gas of the outer container or to control the seal. Thanks to the presence of a free passage between the two containers, also fitted one into the other, the drainage of the outer container can be carried out for example by a dip tube which goes down to the bottom of the container.
  • a dip tube which goes down to the bottom of the container.
  • the two containers may be a sealed metal container and its radioprotective packaging, but it is also possible that each of the containers is a sealed metal packaging container, the device possibly being itself incorporated into a radioprotective packaging. Double containment under water can thus be achieved without weighing down the conditioning system by the presence of a dry containment enclosure.
  • the inner container is a sealed metal container which has a central chimney, that is to say that it has, in section, an annular shape.
  • the chimney will be used for the drainage and the inert gas of the external container, and / or the control of the tightness.
  • a closure plate system ensures the tightness of the inner container before closing and draining the outer container. The same blanking plate system can be used for the outer container.
  • the invention further relates to a method of draining a double container, as well as a method of packaging radioactive material using this drainage. These processes make it possible to condition the equipment under water.
  • two sealed metal containers are used to ensure a double confinement of the radioactive material without weighing down the material required by the presence of a dry enclosure, each step can be performed under water.
  • the invention also relates in another aspect to an inner sealed metal container, the shape of which facilitates the current procedures, particularly with regard to the emptying, and therefore the sealing, of the outer container in which it will be by the conditioned suite.
  • the inner container consisting of a conventional container with a permanent bottom, also has a chimney that passes through the bottom and leaves a free passage when the container is sealed. This passage allows the introduction of gas and / or suction in the container surrounding it.
  • the figure 1 shows a metal container (20), formed of a cylindrical container with side walls and loading opening, closed at its lower end by an immovable bottom.
  • the metal container (20) is further traversed along its axis by a chimney (25) of circular section: the chimney therefore has walls along its length but remains open at both ends.
  • the walls of the container that is to say both the side walls and those of the chimney, support the radioactivity but are not necessarily radioprotective. It is clear that these different forms and provisions are preferred but not essential examples: for example a container of parallelepiped section, a side chimney and / or a chimney of another shape are other possibilities.
  • the containment vessel (20) Before loading the irradiated fuel assemblies (1), the containment vessel (20) is placed in the pool of the nuclear power plant. In the context of security measures and especially the methods according to the invention, most of the time, the container is previously introduced into another container, or two, as will be described later.
  • a basket (2) for the nuclear fuel assemblies (1) can be placed, preferably before immersion in the pool.
  • Another possibility is the stacking of baskets.
  • a filter plate (26) which allows to retain the impurities in the baskets without reaching the closure system.
  • a drainage device (22) provided with two self-sealing orifices and a dip tube (23) is placed in the upper part of the container, along the wall which is not that of the chimney; preferably, it is located above a space left free by the cells (5) and welded to the wall.
  • the dip tube (23) is connected, preferably by welding, to one of the two self-sealing orifices of the device (22); the second orifice (24) opens under the device and serves as a vent. It is also possible to weld the drainage device (22) with its dip tube (23) before placing the baskets (2, 3, 4).
  • a shielded plug (27) is placed above the filter plate.
  • This shielded plug however allows access to the drainage device (22) equipped with the dip tube (23) free: the drainage and the inert gas of the container will therefore be assured. Thanks to the plug (27), it is then possible to remove the metal container (20), and the container (s) surrounding it, the pool, the latter providing radiological radiological protection.
  • a primary blanking plate 28
  • Level of water is lowered into the container just below the level of the shielded plug (27).
  • the primary sealing plate (28) is then put in place, for example by welding along the walls of the chimney (25), the metal container (20) and the drainage device (22). Then, the emptying of the metal container can be carried out.
  • One of the methods used for emptying is to inject compressed air through the self-sealing orifice (24) or to suck through the drainage tube (23). Then, the metal container (20) is drained and dried by vacuum suction; there can be control of the drying by a test of pressure rise. Finally, an inert gas (N 2 or preferably He) is injected. Preferably, the upper end of the drainage device (22) is then closed by welding an orifice plate (28 ') (see FIG. figure 5 ).
  • a secondary sealing plate (29) is provided which is annular in shape, which is housed inside the walls of the metal container (20), above the primary plate (28), but which also covers the drainage device (22), to make the metal container tight, for example by welding.
  • the fuel is now confined in the metal container (20) which forms a closed volume, with the exception of the stack (25) which passes through the primary sealing plates (28) and secondary (29), as well as the bottom of the container (20).
  • the chimney (25) is used for the drainage of the container surrounding the first metal containment vessel: the chimney leaves a passage that will allow the exchange of gas and liquid through the container (30, 40) surrounding the metal container (20).
  • the sealed metal containment container (20) is usually located in a second container (30).
  • the two containers are adjusted: the space between them is preferably minimal; Furthermore, it is desirable to avoid movement between the two containers and to limit the volume of residual gas between the two containers which is detrimental in view of the heat exchange.
  • a play of a few millimeters (maximum 1 cm) between the two containers with a diameter of about 1 m is usually tolerated.
  • - 1.5 m the usual length is 3 to 4.5 m, with a chimney about 80 mm in diameter, the size of a fuel assembly).
  • the second container or outer container
  • the second container was present in the pool under, for example, 10 m of water. So water remains between the two containers, regardless of the fit between the two volumes, and the outer container must be drained.
  • the chimney is a preferred solution for draining a cylindrical container, in fact, it suffices that a passage (15) remains empty between the two containers (20, 30) when they are located one in the other.
  • the metal container of internal conditioning does not have a chimney, it is however possible, by the adaptation of the geometries of the two containers (20, 30) to have a sufficient passage while respecting the tolerance of adjustment of 1% over most of the area.
  • Figures 3a, 3b and 3c different types of geometry possible to achieve this result; these options are also part of the invention.
  • the figure 3a The chimney embodiment according to the invention is preferred because the symmetrical containers are easier to handle during automated welding procedures.
  • the figure 3c may be recommended if, for example, the shape of the fuel baskets can not be adapted to the "hole" required for the passage of the chimney. In this case, a protrusion (35) on the outer container (30) performs the same function.
  • the drainage method is then as follows: the device (10) is prepared, with placement of the inner metal container (20) in the outer container (30) and immersion in the loading pool ( figure 4a ). To facilitate and optimize the future drainage procedures, it is preferable to leave a clearance at the bottom between the two containers, for example by means of spacer pads (37). The inner metal container is filled and sealed, for example according to the procedure previously described ( figure 4b ).
  • the outer container is closed by a sealed cover (38) comprising, welded centrally in the frame of the figure, a drainage device (32) similar to the device used to drain the inner container or as shown in FIG. figure 2 the drainage device (32) is thus provided with a first self-closing orifice to which is connected a plunger tube (33), and a second self-closing orifice (34) opening under the drainage device and acting as a vent (see figure 5 ).
  • the drainage device (32) is in fact located opposite the passage (15) so that the dip tube (33) can enter the passage. It can then be drained ( figure 4c ): compressed air is injected through the orifice (34) or is sucked by the drainage tube (33) to remove the residual water. Then there is drainage and vacuum drying.
  • a check of the tightness of the outer container can preferably be carried out through the passage (15), for example by pressure rise test. Similarly, a possible control of the drying can be implemented by a pressure rise test. Finally, an inert gas (He or N 2 ) is injected.
  • He or N 2 inert gas
  • the two self-sealing orifices are closed by welding, for example, an orifice plate (38 ') above the drainage device (32) to ensure confinement.
  • an orifice plate (38 ') above the drainage device (32) to ensure confinement.
  • the internal metal container it is possible to seal with a second sealed cover (39) which will be welded to the outer casing (30) ( figure 4d ), and to control this tightness, in particular by increasing the pressure of the space between the covers (38, 39).
  • the outer container (30) may be a storage and / or transfer package (40), the side walls of which are then radioprotective.
  • This package is closed at its lower end (in the sense of the figure 4 ), removably or not following the discharge procedure in the storage site. It has a cover (38) for its other end.
  • This cover can for example be screwed, but if long-term storage is provided, welding can be performed.
  • the closure of the self-sealing openings is effected by sealing with a buffer and a tape, before final sealing.
  • the closure process is simplified compared to existing procedures.
  • the cover (38) has here a drainage device (32) by which drainage and inert gas are carried out and / or means for checking the tightness; all actions following drainage and closure are performed at the same end of the package. It is therefore not necessary to use a second system to close a lateral orifice located at the bottom of packaging.
  • the methods employing single hole transfer packs used in the state of the art require complex procedures to avoid the introduction of water between the two containers and control means to ensure that the sealing has been preserved.
  • the outer container is selected as a second metal containment container (30).
  • a metal container has an immovable bottom, and will normally be sealed “permanently”.
  • the bottom of the outer metal container may be radioprotective, but this is not a necessity. It may comprise spacing pads (37).
  • a second primary blanking plate (38) is provided for closing the second metal container (30); it has at its center a drainage device (32), provided with a dip tube (33) which enters the chimney (25) which remains free, in order to ensure that the second external metal container (30) is emptied and put under an inert gas. ).
  • the primary sealing plate (38) can be fixed by welding.
  • a second secondary sealing plate (39) in the context of this circular example, will make the second metal container tight (30), with possible control of the seal.
  • the assembly (10) of the two metal containers (20, 30) is used for storage or transport, it is also possible to package the outer metal container (30) in a radio-walled transfer package (40). protective devices according to known methods.
  • each metal container (20, 30) can be effected by any suitable technique, such as manual welding.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Packages (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Container Filling Or Packaging Operations (AREA)

Claims (24)

  1. Vorrichtung (10) zum Konditionieren von Kernbrennstoffelementen (1) mit einem dicht ausgeführten, metallischen Innenbehälter zum Konditionieren der Elemente (20) und einem dicht ausgeführten Außenbehälter (30), der den Innenbehälters (20) enthalten kann, wobei zumindest der dichte Außenbehälter (30) einen Boden und ein offenes Ende aufweist, so dass dann, wenn der Innenbehälters (20) sich in dem Außenbehälter (30) befindet, ein Durchgang (15) zwischen den beiden Behältern vom offenen Ende bis zum Boden des Außenbehälters frei bleibt, wobei der Durchgang Mittel (22, 23, 24; 32, 33, 34) aufweist, um den Außenbehälter zu entwässern und/oder die Dichtheit des Außenbehälters (30) zu überprüfen.
  2. Vorrichtung nach Anspruch 1, wobei der Innenbehälter in den Außenbehälter eingepasst ist.
  3. Vorrichtung nach einem der Ansprüche 1 oder 2, wobei der Durchgang (15) ein durchgehender Schacht (25) ist, der im Innenbehälter (20) angeordnet ist.
  4. Vorrichtung nach Anspruch 3, wobei deren Innenbehälter (20) und der Schacht (25) kreiszylindrisch sind.
  5. Vorrichtung nach Anspruch 4, wobei deren Schacht (25) auf der Achse des Innenbehälters (20) angeordnet ist.
  6. Vorrichtung nach Anspruch 2 in Kombination mit einem der Ansprüche 3 bis 5, wobei der Boden des metallischen Innenbehälters (20) nicht abnehmbar ausgeführt ist, der Schacht (25) zum nicht abnehmbaren Boden führt und der Schacht das Entwässern des diesen enthaltenden eingepassten Behälters (30) gestattet.
  7. Vorrichtung nach einem der Ansprüche 1 bis 6, wobei deren Innenbehälter (20) zylindrisch ist und der Außenbehälter (30) einen den Durchgang (15) begrenzenden Vorsprung (35) aufweist.
  8. Vorrichtung nach einem der Ansprüche 1 bis 6 mit einem Abschirmstopfen (27), der in dichter Weise am offenen Ende des Innenbehälters (20) so montiert sein kann, dass der Durchgang (15) den Stopfen durchsetzt.
  9. Vorrichtung nach Anspruch 8 mit zumindest einer Verschlussplatte (28, 29), die derart montiert sein kann, dass der Innenbehälter (20) dicht ist.
  10. Vorrichtung nach einem der Ansprüche 1 bis 9, wobei der Außenbehälter (30) einen dichten Deckel (38) mit Mitteln (32) zum Entwässern des Außenbehälters (30) und/oder zum Überprüfen seiner Dichtheit aufweist, welche dem Durchgang (15) entgegengesetzt positioniert sein können, wenn der Innenbehälter (20) in den Außenbehälter (30) eingesetzt ist.
  11. Vorrichtung nach einem der Ansprüche 1 bis 10 mit Mitteln (32) zum Entwässern des Außenbehälters, welcher ein Tauchrohr (33) aufweist.
  12. Vorrichtung nach einem der vorangehenden Ansprüche, wobei deren Außenbehälter ein Lagergebinde (40) ist, dessen Wände eine Strahlenschutzwirkung haben.
  13. Vorrichtung nach einem der Ansprüche 1 bis 11, wobei deren Außenbehälter ein dicht ausgeführter, metallischer Behältern zum Konditionieren von Kernbrennstoffelementen (30) ist.
  14. Vorrichtung nach Anspruch 13, ferner enthaltend ein Überführungsgebinde (40), dessen Wände eine Strahlenschutzwirkung haben und den Außenbehälter (30) enthalten können.
  15. Verfahren zum Konditionieren von Kernbrennstoffelementen unter Wasser, umfassend das Einsetzen der Elemente (1) in den dicht ausgeführten, metallischen Innenbehälter (20) der Vorrichtung (10) nach einem der Ansprüche 1 bis 13, der seinerseits in dem Außenbehälter (30) angeordnet ist.
  16. Verfahren zum Konditionierten von Kernbrennstoffelementen unter Wasser, umfassend das Einsetzen der Elemente (1) in den dicht ausgeführten, metallischen Innenbehälter (20) der Vorrichtung (10) nach Anspruch 13, der seinerseits in dem dicht ausgeführten, metallischen Außenbehälter (30) angeordnet ist, der seinerseits in dem Überführungsgebinde (40) angeordnet ist.
  17. Verfahren nach Anspruch 16, wobei die Dichtheit zwischen Außenbehälter (30) und Überführungsgebinde (40) mittels einer Dichtung gewährleistet wird.
  18. Verfahren zum Entwässern eines Außenbehälters (30) für radioaktive Stoffe (1), umfassend das Einsetzen eines dicht ausgeführten, metallischen Innenbehälters (20) in den Außenbehälter, wobei ein Durchgang (15, 25, 35) zwischen den beiden Behältern frei gelassen wird, die Einschließung der radioaktiven Stoffe in den dichten Innenbehälter (20) und das Entwässern des Außenbehälters (30) mittels des Durchgangs (15, 25, 35).
  19. Verfahren nach Anspruch 18, wobei das Entwässern des Außenbehälters über dasselbe Ende des Außenbehälters wie die Einschließung des Innenbehälters erfolgt.
  20. Verfahren nach Anspruch 18 oder 19, wobei das Entwässern über ein Tauchrohr (33) erfolgt, das bis zum Boden des Außenbehälters tritt.
  21. Verfahren nach einem der Ansprüche 18 bis 20, wobei die Einschließung des dicht ausgeführten, metallischen Innenbehälters (20) durch Anschweißen zumindest einer Verschlussplatte (28, 29) erfolgt.
  22. Verfahren zur zweifachen Einschließung von radioaktiven Stoffen, umfassend das Entwässerungsverfahren nach einem der Ansprüche 18 bis 21, gefolgt von der Einschließung des Außenbehälters.
  23. Verfahren nach Anspruch 22, wobei der Außenbehälter ein dicht ausgeführter, metallischer Außenbehälter (30) ist, dessen Einschließung durch Anschweißen zumindest einer Verschlussplatte (37, 38) gewährleistet wird.
  24. Verfahren nach Anspruch 23, wobei der Außenbehälter (30) in ein Überführungsgebinde (40) mit Wänden mit Strahlenschutzwirkung integriert ist.
EP04805791A 2003-11-03 2004-10-28 Einrichtung und verfahren zur packung von kernbrennstoffbaugruppen mit doppel-eingrenzungsbarriere Not-in-force EP1700315B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0350775A FR2861889B1 (fr) 2003-11-03 2003-11-03 Dispositif et procede de conditionnement d'assemblages de combustible nucleaire a double barriere de confinement
PCT/FR2004/050548 WO2005045849A2 (fr) 2003-11-03 2004-10-28 Dispositif et procede de conditionnement d'assemblages de combustible nucleaire a double barriere de confinement.

Publications (2)

Publication Number Publication Date
EP1700315A2 EP1700315A2 (de) 2006-09-13
EP1700315B1 true EP1700315B1 (de) 2009-12-09

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Country Status (8)

Country Link
US (1) US7781752B2 (de)
EP (1) EP1700315B1 (de)
JP (1) JP5291881B2 (de)
AT (1) ATE451698T1 (de)
DE (1) DE602004024583D1 (de)
ES (1) ES2337363T3 (de)
FR (1) FR2861889B1 (de)
WO (1) WO2005045849A2 (de)

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DE602004024583D1 (de) 2010-01-21
US7781752B2 (en) 2010-08-24
FR2861889A1 (fr) 2005-05-06
ATE451698T1 (de) 2009-12-15
JP2007510919A (ja) 2007-04-26
ES2337363T3 (es) 2010-04-23
JP5291881B2 (ja) 2013-09-18
US20070274430A1 (en) 2007-11-29
FR2861889B1 (fr) 2006-02-10
WO2005045849A3 (fr) 2005-09-01
EP1700315A2 (de) 2006-09-13
WO2005045849A2 (fr) 2005-05-19

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