EP0556455A1 - Shielded transport container for irradiated fuel elements for nuclear reactor and method for plating a surface layer onto the shielded transport container - Google Patents

Shielded transport container for irradiated fuel elements for nuclear reactor and method for plating a surface layer onto the shielded transport container Download PDF

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Publication number
EP0556455A1
EP0556455A1 EP92119858A EP92119858A EP0556455A1 EP 0556455 A1 EP0556455 A1 EP 0556455A1 EP 92119858 A EP92119858 A EP 92119858A EP 92119858 A EP92119858 A EP 92119858A EP 0556455 A1 EP0556455 A1 EP 0556455A1
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EP
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Prior art keywords
layer
transport container
nickel
solidified
shielding transport
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EP92119858A
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German (de)
French (fr)
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EP0556455B1 (en
Inventor
Manfred Dr. Dipl.-Phys. Sappok
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Siempelkamp Giesserei KG
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Siempelkamp Giesserei KG
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C24/00—Coating starting from inorganic powder
    • C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
    • C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
    • C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
    • C23C24/106—Coating with metal alloys or metal elements only
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/06—Metallic material
    • C23C4/08—Metallic material containing only metal 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
    • G21F1/00—Shielding characterised by the composition of the materials
    • 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

Definitions

  • the invention relates to a shielding transport container for nuclear reactor fuel assemblies with a spheroidal cast iron container body which has a cover receptacle, and with a lid fitted into the cover receptacle, at least the cast body of the container body having a surface with open pores and an end layer made of a metal or from a metal alloy from the group "nickel, nickel-based alloy, austenitic chromium / nickel alloy".
  • a shielding transport container also regularly serves as a shielding storage container.
  • the cover fitted into the cover receptacle can also have an end layer made of a metal or a metal alloy from the group "nickel, nickel-based alloy, austenitic chromium / nickel alloy".
  • the invention further relates to a method for producing such a shielding transport container.
  • the invention also relates to a special use of a layer produced from a particle melt.
  • Shielding transport containers of the structure described and the intended purpose are regularly introduced into a corresponding fuel element pool of the nuclear power plant, in which water is located, and are filled with the fuel elements under water, as it were, for loading with the irradiated fuel elements.
  • the pool is regularly lined with stainless steel, for example 18/8 chrome nickel steel.
  • stainless steel for example 18/8 chrome nickel steel.
  • the container body made of cast iron is introduced, a galvanic element is formed, and in particular ferritic iron from the cast matrix is dissolved. This corrodes the stainless steel lining of the fuel element pool.
  • the surface of the container body is also adversely affected. To avoid all of this, the finishing layer is provided. This prevents the formation of elements and thus prevents ferritic iron from going into solution and the described corrosion phenomena occurring. This is especially true when working with nickel or a nickel-based alloy.
  • the final layer is applied with the aid of electroplating technology.
  • Corresponding galvanotechnical systems are required, which are very large because of the size of the shielding transport container are expensive.
  • Practice shows that the electroplated finishing layers in thin layers of up to 200 ⁇ m thick or even more are not up to the requirements of practice.
  • more or less punctiform open spots appear in the end layers.
  • Studies which do not belong to the prior art have shown that these open areas are located above open pores which the cast body shows on its surface.
  • the end layers have been made by electroplating in order to make the end layers extremely thick, for example with layer thicknesses of 1.5 mm, 2.00 mm and more. This is also complex and nonetheless not sufficiently secure.
  • the invention has for its object to provide a shielding transport container of the structure described above and the intended use, which can be filled in a water basin with irradiated fuel elements, which has an all-round end layer made of a metal or a metal alloy of the group " Nickel, nickel-based alloy, austenitic chromium / nickel alloy ".
  • the invention is further based on the object of specifying a method which is particularly suitable for applying such a finishing layer.
  • the invention first teaches that the closing layer has the texture of a layer solidified from a particle melt, the particles of which have a diameter which is smaller than that of the open pores, and that the closing layer also fills the open pores.
  • the texture can correspond to the solidified layer of a powder melt. This means that the layer was built up from powder.
  • the texture can also correspond to that of a drop melt. This means that the layer was made up of fine drops.
  • the melting of the particles to form the layer having the described texture can be done in any way and make use of the tools of modern metal coating technology.
  • the invention is based on the knowledge that a final layer, which has the texture of a layer solidified from a particle melt, surprisingly also fills the open pores of the cast body if the particles have a diameter which is smaller than that of the open pores. It goes without saying that the diameter of the particles must be sufficiently small. Particularly suitable diameters can easily be determined by experiment taking into account the pore size. Since the problems described at the outset no longer occur in the shielding transport container according to the invention because there are no longer open pores of the cast body under the closing layer, very thin layer thicknesses of the closing layer can be used according to the invention. In this connection, the invention teaches that the final layer has a thickness of up to 200 microns. The final layer preferably has a thickness of approximately 100 ⁇ m.
  • the surface of the cast body of the container body can be machined and the final layer can be applied to the mechanically machined surface.
  • a mechanically processed surface of the cast body has the pores described at the outset, because during the mechanical processing in particular the spherical graphite components in the cast matrix are torn out of the latter.
  • the final layer to the merely cleaned surface of the cast skin of the cast body. This also owns regularly fine pores that are closed according to the invention.
  • a laser coating method is preferably used according to the invention.
  • the subject of the invention is a method for applying the final layer to the cast body of a shielding transport container, this method being characterized in that the particles are combined by at least one laser beam of sufficient energy to melt the particles.
  • the laser beam forming an interaction zone with the surface, is directed onto the surface to be coated and is moved in paths along the surface to be coated, the particles being introduced into the interaction zone.
  • the particles can be applied or introduced as powder using a spray nozzle. However, the particles can also be applied or introduced using the plasma spraying method.
  • the invention also relates to the use measures to which claims 12 to 15 are directed.
  • a cast body consisting of spherulitic cast iron, which belongs to the container body of a shielding transport container for irradiated nuclear reactor fuel elements. It can be seen that the cast body 1 has a surface 2 with open pores 3.
  • a closing layer 4 which may consist of nickel or a nickel-based alloy in the exemplary embodiment, is applied to the surface.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • High Energy & Nuclear Physics (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Plasma & Fusion (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)

Abstract

A shielded transport container for irradiated nuclear reactor fuel elements with a container body consisting of spherolytic cast iron and having a cover seat and a cover fitting into the cover seat. At least the cast body (1) of the container body has a surface (2) with open pores (3) and a sealing layer (4). The sealing layer (4) has the texture of a layer (5) which has solidified from a particle melt and whose particles have a diameter which is smaller than that of the open pores (3). It also fills the open pores (3). A process for producing a sealing layer (4) is also indicated. The invention also relates to the particular use of a layer, solidified from a particle melt, as a sealing layer. <IMAGE>

Description

Die Erfindung betrifft einen Abschirm-Transportbehälter für Kernreaktor-Brennelemente mit einem aus spärolithischem Gußeisen bestehenden Behälterkörper, der eine Deckelaufnahme aufweist, und mit in die Deckelaufnahme eingepaßtem Deckel, wobei zumindest der Gußkörper des Behälterkörpers eine Oberfläche mit offenen Poren sowie eine Abschlußschicht aus einem Metall oder aus einer Metallegierung der Gruppe "Nickel, Nickelbasislegierung, austenitische Chrom/Nickel-Legierung" aufweist. Ein solcher Abschirm-Transportbehälter dient regelmäßig auch als Abschirm-Lagerbehälter. Auch der in die Deckelaufnahme eingepaßte Deckel kann eine Abschlußschicht aus einem Metall oder aus einer Metallegierung der Gruppe "Nickel, Nickelbasislegierung, austenitische Chrom/Nickel-Legierung" aufweisen. Die Erfindung betrifft fernerhin ein Verfahren zur Herstellung eines solchen Abschirm-Transportbehälters. Gegenstand der Erfindung ist auch eine besondere Verwendung einer aus einer Partikelschmelze erzeugten Schicht.The invention relates to a shielding transport container for nuclear reactor fuel assemblies with a spheroidal cast iron container body which has a cover receptacle, and with a lid fitted into the cover receptacle, at least the cast body of the container body having a surface with open pores and an end layer made of a metal or from a metal alloy from the group "nickel, nickel-based alloy, austenitic chromium / nickel alloy". Such a shielding transport container also regularly serves as a shielding storage container. The cover fitted into the cover receptacle can also have an end layer made of a metal or a metal alloy from the group "nickel, nickel-based alloy, austenitic chromium / nickel alloy". The invention further relates to a method for producing such a shielding transport container. The invention also relates to a special use of a layer produced from a particle melt.

Abschirm-Transportbehälter des beschriebenen Aufbaus und der beschriebenen Zweckbestimmung werden zum Beladen mit den bestrahlten Brennelementen regelmäßig in ein entsprechendes Brennelementbecken des Kernkraftwerkes eingebracht, in dem sich Wasser befindet, und gleichsam unter Wasser mit den Brennelementen befüllt. Das Becken besitzt regelmäßig eine Auskleidung aus einem Edelstahl, beispielsweise aus 18/8-Chromnickelstahl. Aus elektrochemischen Gründen entsteht beim Einbringen des Behälterkörpers aus Gußeisen ein galvanisches Element und insbesondere ferritisches Eisen aus der Gußmatrix geht in Lösung. Dadurch korrodiert die Edelstahlauskleidung des Brennelementbeckens. Auch wird die Oberfläche des Behälterkörpers störend beeinflußt. Um all dieses zu vermeiden, wird die Abschlußschicht vorgesehen. Diese verhindert die Elementbildung und verhindert damit, daß ferritisches Eisen in Lösung geht und die beschriebenen Korrosionserscheinungen auftreten. Das gilt insbesondere, wenn mit Nickel oder mit einer Nickelbasislegierung gearbeitet wird.Shielding transport containers of the structure described and the intended purpose are regularly introduced into a corresponding fuel element pool of the nuclear power plant, in which water is located, and are filled with the fuel elements under water, as it were, for loading with the irradiated fuel elements. The pool is regularly lined with stainless steel, for example 18/8 chrome nickel steel. For electrochemical reasons, when the container body made of cast iron is introduced, a galvanic element is formed, and in particular ferritic iron from the cast matrix is dissolved. This corrodes the stainless steel lining of the fuel element pool. The surface of the container body is also adversely affected. To avoid all of this, the finishing layer is provided. This prevents the formation of elements and thus prevents ferritic iron from going into solution and the described corrosion phenomena occurring. This is especially true when working with nickel or a nickel-based alloy.

Im Rahmen der bekannten Maßnahmen, von denen die Erfindung ausgeht, wird die Abschlußschicht mit den Hilfsmitteln der Galvanotechnik aufgebracht. Dazu sind entsprechende galvanotechnische Anlagen erforderlich, die wegen der Größe der Abschirm-Transportbehälter sehr aufwendig sind. Die Praxis zeigt, daß die galvanotechnisch aufgebrachten Abschlußschichten in dünnen Schichten von bis zu 200 µm Dicke oder sogar mehr den Anforderungen der Praxis nicht gewachsen sind. Bei unvermeidbaren mechanischen, thermischen oder korrosiven Beanspruchungen zeigen sich in den Abschlußschichten mehr oder weniger punktförmige offene Stellen. Untersuchungen, die nicht zum Stand der Technik gehören, haben gezeigt, daß sich diese offenen Stellen über offenen Poren befinden, die der Gußkörper in seiner Oberfläche zeigt. Dort sind sie unvermeidbar, weil beim galvanotechnischen Aufbringen der Abschlußschichten an den offenen Poren in der Oberfläche des Gußkörpers elektrische Potentiale sich ausbilden, die verhindern, daß die Poren mit dem Nickel oder Nickelbasis-Legierung ausgefüllt werden. Die Poren werden vielmehr lediglich abgedeckt und diese Bereiche der Abschlußschicht sind sehr empfindlich gegen die beschriebenen Beanspruchungen. Um das Entstehen von offenen Stellen zu vermeiden, ist man im Rahmen des galvanotechnischen Aufbringens der Abschlußschichten dazu übergegangen, die Abschlußschichten extrem dick auszuführen, beispielsweise mit Schichtdicken von 1,5 mm, 2,00 mm und mehr. Das ist ebenfalls aufwendig und nichtsdestoweniger nicht ausreichend sicher.As part of the known measures from which the invention is based, the final layer is applied with the aid of electroplating technology. Corresponding galvanotechnical systems are required, which are very large because of the size of the shielding transport container are expensive. Practice shows that the electroplated finishing layers in thin layers of up to 200 µm thick or even more are not up to the requirements of practice. In the event of unavoidable mechanical, thermal or corrosive stresses, more or less punctiform open spots appear in the end layers. Studies which do not belong to the prior art have shown that these open areas are located above open pores which the cast body shows on its surface. There they are unavoidable because during the electroplating of the closing layers on the open pores in the surface of the cast body, electrical potentials are formed which prevent the pores from being filled with the nickel or nickel-based alloy. Rather, the pores are only covered and these areas of the final layer are very sensitive to the stresses described. In order to avoid the formation of open spots, the end layers have been made by electroplating in order to make the end layers extremely thick, for example with layer thicknesses of 1.5 mm, 2.00 mm and more. This is also complex and nonetheless not sufficiently secure.

Der Erfindung liegt die Aufgabe zugrunde, einen Abschirm-Transportbehälter des eingangs beschriebenen Aufbaus und der eingangs beschriebenen Zweckbestimmung, der in einem Wasserbecken mit bestrahlten Brennelementen befüllbar ist, zu schaffen, der eine allen Anforderungen genügende Abschlußschicht aus einem Metall oder aus einer Metallegierung der Gruppe "Nickel, Nickelbasislegierung, austenitische Chrom/Nickel-Legierung" aufweist. Der Erfindung liegt fernerhin die Aufgabe zugrunde, ein Verfahren anzugeben, welches zum Aufbringen einer solchen Abschlußschicht besonders geeignet ist.The invention has for its object to provide a shielding transport container of the structure described above and the intended use, which can be filled in a water basin with irradiated fuel elements, which has an all-round end layer made of a metal or a metal alloy of the group " Nickel, nickel-based alloy, austenitic chromium / nickel alloy ". The invention is further based on the object of specifying a method which is particularly suitable for applying such a finishing layer.

Zur Lösung dieser Aufgabe in bezug auf die Gestaltung des Abschirm-Transportbehälters lehrt die Erfindung zunächst, daß die Abschlußschicht die Textur einer aus einer Partikelschmelze erstarrten Schicht aufweist, deren Partikel einen Durchmesser besitzen, der kleiner ist als der der offenen Poren, und daß die Abschlußschicht auch die offenen Poren ausfüllt. Die Textur kann der erstarrten Schicht einer Pulverschmelze entsprechen. Das bedeutet, daß die Schicht aus Pulver aufgebaut wurde. Die Textur kann auch der einer Tropfenschmelze entsprechen. Das bedeutet, daß die Schicht aus feinen Tropfen aufgebaut wurde. Das Aufschmelzen der Partikel zur Bildung der Schicht, die die beschriebene Textur aufweist, kann auf beliebige Art und Weise erfolgen und von den Hilfsmitteln der modernen Metallbeschichtungstechnik Gebrauch machen.To achieve this object with regard to the design of the shielding transport container, the invention first teaches that the closing layer has the texture of a layer solidified from a particle melt, the particles of which have a diameter which is smaller than that of the open pores, and that the closing layer also fills the open pores. The texture can correspond to the solidified layer of a powder melt. This means that the layer was built up from powder. The texture can also correspond to that of a drop melt. This means that the layer was made up of fine drops. The melting of the particles to form the layer having the described texture can be done in any way and make use of the tools of modern metal coating technology.

Die Erfindung geht von der Erkenntnis aus, daß eine Abschlußschicht, welche die Textur einer aus einer Partikelschmelze erstarrten Schicht aufweist, überraschenderweise auch die offenen Poren des Gußkörpers ausfüllt, wenn die Partikel einen Durchmesser aufweisen, der kleiner ist als der der offenen Poren. Es versteht sich, daß der Durchmesser der Partikel ausreichend klein sein muß. Besonders geeignete Durchmesser können unter Berücksichtigung der Porengröße leicht durch Versuche ermittelt werden. Da bei dem erfindungsgemäßen Abschirm-Transportbehälter die eingangs beschriebenen Probleme nicht mehr auftreten, weil sich unter der Abschlußschicht offene Poren des Gußkörpers nicht mehr befinden, kann erfindungsgemäß mit sehr dünnen Schichtdicken der Abschlußschicht gearbeitet werden. In diesem Zusammenhang lehrt die Erfindung, daß die Abschlußschicht eine Dicke von bis zu 200 µm aufweist. Vorzugsweise weist die Abschlußschicht eine Dicke von etwa 100 µm auf.The invention is based on the knowledge that a final layer, which has the texture of a layer solidified from a particle melt, surprisingly also fills the open pores of the cast body if the particles have a diameter which is smaller than that of the open pores. It goes without saying that the diameter of the particles must be sufficiently small. Particularly suitable diameters can easily be determined by experiment taking into account the pore size. Since the problems described at the outset no longer occur in the shielding transport container according to the invention because there are no longer open pores of the cast body under the closing layer, very thin layer thicknesses of the closing layer can be used according to the invention. In this connection, the invention teaches that the final layer has a thickness of up to 200 microns. The final layer preferably has a thickness of approximately 100 μm.

Im Rahmen der Erfindung kann die Oberfläche des Gußkörpers des Behälterkörpers mechanisch bearbeitet sein und die Abschlußschicht kann auf die mechanisch bearbeitete Oberfläche aufgebracht sein. Eine mechanisch bearbeitete Oberfläche des Gußkörpers weist die eingangs beschriebenen Poren auf, weil bei der mechanischen Bearbeitung insbesondere die sphärischen Graphitanteile in der Gußmatrix aus dieser herausgerissen werden. Im Rahmen der Erfindung besteht aber überraschenderweise sogar die Möglichkeit, die Abschlußschicht auf die lediglich gereinigte Gußhautoberfläche des Gußkörpers aufzubringen. Auch diese besitzt regelmäßig feine Poren, die erfindungsgemäß verschlossen werden.In the context of the invention, the surface of the cast body of the container body can be machined and the final layer can be applied to the mechanically machined surface. A mechanically processed surface of the cast body has the pores described at the outset, because during the mechanical processing in particular the spherical graphite components in the cast matrix are torn out of the latter. Within the scope of the invention, however, surprisingly there is even the possibility of applying the final layer to the merely cleaned surface of the cast skin of the cast body. This also owns regularly fine pores that are closed according to the invention.

Zum Aufbringen der Abschlußschicht kann, wie bereits erwähnt, mit den verschiedensten Beschichtungsverfahren für die Metallbeschichtung von metallischen Oberflächen gearbeitet werden. Vorzugsweise wird erfindungsgemäß mit einem Laserbeschichtungsverfahren gearbeitet. Insoweit ist Gegenstand der Erfindung ein Verfahren zum Aufbringen der Abschlußschicht auf den Gußkörper eines Abschirm-Transportbehälters, wobei dieses Verfahren dadurch gekennzeichnet ist, daß die Partikel durch zumindest einen Laserstrahl ausreichender Energie zur Partikelschmelze vereinigt werden. Nach bevorzugter Ausführungsform wird der Laserstrahl, eine Wechselwirkungszone mit der Oberfläche bildend, auf die zu beschichtende Oberfläche gerichtet sowie längs der zu beschichtenden Oberfläche in Bahnen bewegt, wobei die Partikel in die Wechselwirkungszone eingebracht werden. Die Partikel können als Pulver mittels Sprühdüse aufgebracht bzw. eingebracht werden. Die Partikel können aber auch nach der Methode des Plasmaspritzens aufgebracht bzw. eingebracht werden.As already mentioned, a wide variety of coating processes for the metal coating of metallic surfaces can be used to apply the final layer. A laser coating method is preferably used according to the invention. In this respect, the subject of the invention is a method for applying the final layer to the cast body of a shielding transport container, this method being characterized in that the particles are combined by at least one laser beam of sufficient energy to melt the particles. According to a preferred embodiment, the laser beam, forming an interaction zone with the surface, is directed onto the surface to be coated and is moved in paths along the surface to be coated, the particles being introduced into the interaction zone. The particles can be applied or introduced as powder using a spray nozzle. However, the particles can also be applied or introduced using the plasma spraying method.

Gegenstand der Erfindung sind auch die Verwendungsmaßnahmen, auf die die Patentansprüche 12 bis 15 gerichtet sind.The invention also relates to the use measures to which claims 12 to 15 are directed.

Im folgenden wird die Erfindung anhand einer lediglich ein Ausführungsbeispiel darstellenden Zeichnung auführlicher erläutert. Es zeigen

Fig. 1
in starker Vergrößerung einen Ausschnitt aus dem Gußkörper eines Abschirm-Transportbehälters mit einer zum Stand der Technik gehörenden Abschlußbeschichtung und
Fig. 2
in starker Vergrößerung einen Ausschnitt aus dem Gußkörper eines Abschirm-Transportbehälters mit erfindungsgemäßer Abschlußschicht.
In the following, the invention will be explained in more detail with reference to a drawing showing only one embodiment. Show it
Fig. 1
in large enlargement a section of the cast body of a shielding transport container with a final coating belonging to the prior art and
Fig. 2
in large enlargement a section of the cast body of a shielding transport container with the inventive end layer.

In den Figuren erkennt man einen aus sphärolithischem Gußeisen bestehenden Gußkörper, welcher dem Behälterkörper eines Abschirm-Transportbehälters für bestrahlte Kernreaktorbrennelemente angehört. Man erkennt, daß der Gußkörper 1 eine Oberfläche 2 mit offenen Poren 3 aufweist. Auf die Oberfläche ist eine Abschlußschicht 4, die im Ausführungsbeispiel aus Nickel oder aus einer Nickelbasis-Legierung bestehen möge, aufgebracht.In the figures, one can see a cast body consisting of spherulitic cast iron, which belongs to the container body of a shielding transport container for irradiated nuclear reactor fuel elements. It can be seen that the cast body 1 has a surface 2 with open pores 3. A closing layer 4, which may consist of nickel or a nickel-based alloy in the exemplary embodiment, is applied to the surface.

Die Fig. 1 zeigt die bekannte Ausführungsform, bei der die Abschlußschicht 4 galvanotechnisch aufgebracht wurde. Man erkennt mehrere galvanotechnisch aufgebrachte Schichten a bis e einer erheblichen Dicke, - man erkennt fernerhin, daß die offene Pore 3 nicht nur nicht ausgefüllt ist, sondern sich in die galvanotechnisch aufgebrachte Abschlußschicht 4 hinein gleichsam fortgesetzt hat.1 shows the known embodiment in which the end layer 4 has been applied by electroplating. One recognizes several electroplated layers a to e of considerable thickness, - one also recognizes that the open pore 3 is not only not is filled in, but has continued into the electroplating layer 4, as it were.

Demgegenüber erkennt man in der Fig. 2, daß die Abschlußschicht 4, die die Textur 5 einer aus einer Partikelschmelze erstarrten Schicht aufweist, auch die offene Pore 3 in der Oberfläche 2 des Gußkörpers 1 ausgefüllt hat. Angedeutet wurde, daß die Partikel einen Durchmesser aufweisen, der wesentlich kleiner ist als der der offenen Pore. - Die Textur 5 wurde zur Verdeutlichung übertrieben dargestellt.In contrast, it can be seen in FIG. 2 that the final layer 4, which has the texture 5 of a layer solidified from a particle melt, has also filled the open pore 3 in the surface 2 of the cast body 1. It was indicated that the particles have a diameter that is significantly smaller than that of the open pore. - Texture 5 has been exaggerated for clarity.

Bewährt haben sich die beschriebenen Maßnahmen für Behälterkörper aus sphärolithischem Gußeisen der folgenden Zusammensetzung Kohlenstoff 3,2 bis 3,8 %, Silicium 1,6 bis 2,6 %, Mangan 0,1 bis 0,3 %, Magnesium 0,025 bis 0,06 %, Rest Eisen und übliche Beimengungen. Bewährt hat sich fernerhin die Verwendung von technisch reinem Nickel mit 99 oder mehr Gew.% Nickel, gegebenenfalls mit einem definierten Phosphorzusatz und mit bei technischem Nickel üblichen Beimengungen.The measures described have proven useful for container bodies made of spherulitic cast iron of the following composition: carbon 3.2 to 3.8%, silicon 1.6 to 2.6%, manganese 0.1 to 0.3%, magnesium 0.025 to 0.06 %, Balance iron and usual additions. The use of technically pure nickel with 99% or more by weight of nickel, optionally with a defined addition of phosphorus and with admixtures customary in technical nickel, has also proven successful.

Claims (15)

Abschirm-Transportbehälter für bestrahlte Kernreaktorbrennelemente,
   mit einem aus spärolithischem Gußeisen bestehenden Behälterkörper, der eine Deckelaufnahme aufweist, und mit in die Deckelaufnahme eingepaßtem Deckel,
wobei zumindest der Gußkörper des Behälterkörpers eine Oberfläche mit offenen Poren sowie eine Abschlußschicht aus einem Metall oder aus einer Metallegierung der Gruppe "Nickel, Nickelbasislegierung, austenitische Chrom/Nickel-Legierung" aufweist, dadurch gekennzeichnet, daß die Abschlußschicht die Textur einer aus einer Partikelschmelze erstarrten Schicht aufweist, deren Partikel einen Durchmesser besitzen, der kleiner ist als der der offenen Poren, und daß die Abschlußschicht auch die offenen Poren ausfüllt.Shielding transport container for irradiated nuclear reactor fuel elements,
with a container body made of spherolithic cast iron, which has a lid receptacle, and with a lid fitted into the lid receptacle,
wherein at least the cast body of the container body has a surface with open pores and an end layer made of a metal or a metal alloy from the group "nickel, nickel-based alloy, austenitic chromium / nickel alloy", characterized in that the end layer solidifies the texture of a particle melt Has layer whose particles have a diameter which is smaller than that of the open pores, and that the final layer also fills the open pores. Abschirm-Transportbehälter nach Anspruch 1, dadurch gekennzeichnet, daß die Textur der erstarrten Schicht der einer Pulverschmelze entspricht.Shielding transport container according to claim 1, characterized in that the texture of the solidified layer corresponds to that of a powder melt. Abschirm-Transportbehälter nach Anspruch 1, dadurch gekennzeichnet, daß die Textur der erstarrten Schicht der einer erstarrten Tropfenschmelze entspricht.Shielding transport container according to claim 1, characterized in that the texture of the solidified layer which corresponds to a solidified drop melt. Abschirm-Transportbehälter nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Abschlußschicht eine Dicke von bis zu 200 µm aufweist.Shielding transport container according to one of claims 1 to 3, characterized in that the closing layer has a thickness of up to 200 µm. Abschirm-Transportbehälter nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Abschlußschicht eine Dicke von etwa 100 µm aufweist.Shielding transport container according to one of claims 1 to 4, characterized in that the closing layer has a thickness of approximately 100 µm. Abschirm-Transportbehälter nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Oberfläche des Gußkörpers mechanisch bearbeitet und die Abschlußschicht auf die mechanisch bearbeitete Oberfläche aufgebracht ist.Shielding transport container according to one of claims 1 to 5, characterized in that the surface of the cast body is machined and the final layer is applied to the mechanically machined surface. Abschirm-Transportbehälter nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Abschlußschicht auf die Gußhautoberfläche des Gußkörpers aufgebracht ist.Shielding transport container according to one of claims 1 to 5, characterized in that the closing layer is applied to the cast skin surface of the cast body. Verfahren zum Aufbringen der Abschlußschicht auf den Gußkörper eines Abschirm-Transportbehälters nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Partikel durch zumindest einen Laserstrahl zur Partikelschmelze vereinigt werden.Method for applying the final layer to the cast body of a shielding transport container according to one of Claims 1 to 7, characterized in that the particles are combined to form a particle melt by at least one laser beam. Verfahren nach Anspruch 8, dadurch gekennzeichnet, daß der Laserstrahl, eine Wechselwirkungszone auf der Oberfläche bildend, auf die zu beschichtende Oberfläche gerichtet sowie längs der zu beschichtenden Oberfläche in Bahnen bewegt wird und daß die Partikel in die Wechselwirkungszone eingebracht werden.Method according to Claim 8, characterized in that the laser beam, forming an interaction zone on the surface, is directed onto the surface to be coated and is moved in paths along the surface to be coated, and in that the particles are introduced into the interaction zone. Verfahren nach einem der Ansprüche 8 oder 9, dadurch gekennzeichnet, daß die Partikel als Pulver mittels Sprühdüse aufgebracht bzw. eingebracht werden.Method according to one of claims 8 or 9, characterized in that the particles are applied or introduced as a powder by means of a spray nozzle. Verfahren nach einem der Ansprüche 8 oder 9, dadurch gekennzeichnet, daß die Partikel nach der Methode des Plasmaspritzens aufgebracht bzw. eingebracht werden.Method according to one of claims 8 or 9, characterized in that the particles are applied or introduced by the plasma spraying method. Verwendung einer aus einer Partikelschmelze erstarrten Schicht aus einem Metall oder aus Metallegierung der Gruppe "Nickel, Nickelbasislegierung, austenitische Chrom/Nickel-Legierung" als Abschlußschicht auf dem Gußkörper eines Abschirm-Transportbehälters für bestrahlte Kernreaktorbrennelemente, der eine Oberfläche mit offenen Poren aufweist, - mit der Maßgabe, daß die Abschlußschicht eine Dicke von bis zu 200 µm, vorzugsweise von 100 bis 200 µm aufweist, sowie auch die offenen Poren des Gußkörpers ausfüllt und mit der weiteren Maßgabe, daß die Beschickung des Abschirm-Transportbehälters in einem Brennelementbecken erfolgt.Use of a layer solidified from a particle melt of a metal or of a metal alloy from the group "nickel, nickel-based alloy, austenitic chromium / nickel alloy" as a final layer on the cast body of a shielding transport container for irradiated nuclear reactor fuel elements, which has a surface with open pores, with provided that the final layer has a thickness of up to 200 microns, preferably from 100 to 200 microns, and also fills the open pores of the cast body and with the further proviso that the shielding transport container is loaded in a fuel element pool. Verwendung nach Anspruch 12 mit der Maßgabe, daß die Abschlußschicht aus einer Pulverschmelze erstarrt ist.Use according to claim 12 with the proviso that the final layer is solidified from a powder melt. Verwendung nach Anspruch 12 mit der Maßgabe, daß die Abschlußschicht aus einer Tropfenschmelze erstarrt ist.Use according to claim 12 with the proviso that the final layer is solidified from a drop melt. Verwendung nach einem der Ansprüche 12 bis 14, mit der Maßgabe, daß die Abschlußschicht nach einem Laserbeschichtungsverfahren aufgebracht ist.Use according to one of claims 12 to 14, with the proviso that the final layer is applied by a laser coating process.
EP92119858A 1992-02-15 1992-11-21 Shielded transport container for irradiated fuel elements for nuclear reactor and method for plating a surface layer onto the shielded transport container Expired - Lifetime EP0556455B1 (en)

Applications Claiming Priority (2)

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DE4204527A DE4204527C2 (en) 1992-02-15 1992-02-15 Method of making a shielded transport container for irradiated nuclear reactor fuel elements
DE4204527 1992-02-15

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EP0556455A1 true EP0556455A1 (en) 1993-08-25
EP0556455B1 EP0556455B1 (en) 1996-09-18

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WO2016187489A1 (en) * 2015-05-21 2016-11-24 Biologistex Ccm, Llc Biologic stability, delivery logistics and administration of time and/or temperature sensitive biologic based materials
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JP2677749B2 (en) 1997-11-17
EP0556455B1 (en) 1996-09-18
DE4204527C2 (en) 1993-12-23
DE59207185D1 (en) 1996-10-24
DE4204527A1 (en) 1993-08-19
US5338941A (en) 1994-08-16
ES2092618T3 (en) 1996-12-01
JPH06200361A (en) 1994-07-19

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