WO1998016936A1 - Method of manufacturing oblong capsules - Google Patents

Method of manufacturing oblong capsules Download PDF

Info

Publication number
WO1998016936A1
WO1998016936A1 PCT/SE1997/001658 SE9701658W WO9816936A1 WO 1998016936 A1 WO1998016936 A1 WO 1998016936A1 SE 9701658 W SE9701658 W SE 9701658W WO 9816936 A1 WO9816936 A1 WO 9816936A1
Authority
WO
WIPO (PCT)
Prior art keywords
tubes
parcel
canister
casting
casing
Prior art date
Application number
PCT/SE1997/001658
Other languages
French (fr)
Inventor
Gert Johansson
Original Assignee
Gert Johansson
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 Gert Johansson filed Critical Gert Johansson
Publication of WO1998016936A1 publication Critical patent/WO1998016936A1/en

Links

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
    • 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

Definitions

  • the present invention relates to a method of manufacturing oblong canisters for storing spent nuclear fuel elements.
  • Casting long objects with internal cavities while retaining the straightness of the cavities is problematical. This applies particularly to canisters for storing spent nuclear fuel elements. When complete such canisters shall be sealed at the ends and surrounded by an outer casing of copper. This is a method known per se, but it is important that the cavities in the canisters are straight. Furthermore, the casting may not be too complicated and thus expensive.
  • the method according to the invention aims at solving these problems and is characterised in that a bundle of tubes the length of the canister are joined together to form a parcel around which a casing of metal is cast. According to this method sand cores or other types of nuclear material are replaced when the cavities are cast. Straight cavities are obtained in a simple and efficient manner. Tubes having square or round cross section or tubes of some other cross section may be used in the parcel to be joined together, by welding for instance.
  • twelve square tubes are used which are joined together and fixed in the desired grouping, by welding for instance, or bracing between the tubes, after which the tube parcel is filled with filler as required, e.g. ladle lining, and pre-heated.
  • the pre- heated tube parcel is placed in the lower part of a casting mould and the other parts of the mould are positioned, after which casting of the casing is performed in vertical position, or horizontal position if its size permits, and with casting gates at different levels, for instance.
  • the metal used is steel SS 1306, for instance, or some other material.
  • the canister shall be long, having a length:diameter ratio of between 3:1 and 6:1, but other ratios are also possible. Equipment can be built for extreme proportions.
  • One advantage with the method is that strict straightness tolerances or other tolerances for the canister can be obtained and, of course, that the canister can be produced at all.
  • the requirement in the case of square tubes may be that a gauge with dimensions 153:153:4500 shall be passed through the cavity of the canister.
  • the finished canister shall primarily be used for storing spent nuclear fuel elements or other material and shall be sealed all around and at the ends in known manner with an outer casing of copper.
  • Figure 1 shows a longitudinal section of a canister to be cast and Figure 2 shows the same canister in cross section.
  • Figure 3 shows a cross section through a parcel of square tubes.
  • Figures 1 and 2 show a finished canister, in this case a parcel of twelve square tubes (2) which have been welded together to a parcel and filled with filler, after which pre-heating may be performed if necessary.
  • the ratio between the canister length (L) and its diameter (D) is here 4.9:1.
  • the fuel elements When the fuel elements have been placed in the canister it shall be surrounded by an outer casing of copper (1) and end pieces of the same material.
  • the welded parcel of tubes ( Figures 1 and 2) is placed upright and fixed in the lower part or core of a casting mould.
  • the other parts of the mould are positioned and the casting in steel is performed in vertical or horizontal position, e.g. through casting gates at different levels.
  • the material of the tubes is normally steel, SS 1312, and the casting is performed in steel with a wall thickness of 10 mm.
  • One or more casting gates can be used at one or more levels, determined by casting weight, dimensions, etc.
  • Figure 3 shows the square tubes and the straight cavities (2) with bracing (5) welded between the tubes (2). After insertion of the elements the canister is enclosed in copper in known manner.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The present invention relates to a method of manufacturing oblong canisters for storing spent nuclear fuel elements. This method is characterized in that a bundle of tubes (2) the length of the canister are joined together to form a parcel, by means of welding for instance, around which parcel a casing (9) of metal is cast.

Description

Method of manufacturing oblong capsules.
Technical field:
The present invention relates to a method of manufacturing oblong canisters for storing spent nuclear fuel elements.
Background art:
Casting long objects with internal cavities while retaining the straightness of the cavities is problematical. This applies particularly to canisters for storing spent nuclear fuel elements. When complete such canisters shall be sealed at the ends and surrounded by an outer casing of copper. This is a method known per se, but it is important that the cavities in the canisters are straight. Furthermore, the casting may not be too complicated and thus expensive.
Description of the invention:
The method according to the invention aims at solving these problems and is characterised in that a bundle of tubes the length of the canister are joined together to form a parcel around which a casing of metal is cast. According to this method sand cores or other types of nuclear material are replaced when the cavities are cast. Straight cavities are obtained in a simple and efficient manner. Tubes having square or round cross section or tubes of some other cross section may be used in the parcel to be joined together, by welding for instance.
In a suitable embodiment, for instance, twelve square tubes are used which are joined together and fixed in the desired grouping, by welding for instance, or bracing between the tubes, after which the tube parcel is filled with filler as required, e.g. ladle lining, and pre-heated. The pre- heated tube parcel is placed in the lower part of a casting mould and the other parts of the mould are positioned, after which casting of the casing is performed in vertical position, or horizontal position if its size permits, and with casting gates at different levels, for instance. The metal used is steel SS 1306, for instance, or some other material. The canister shall be long, having a length:diameter ratio of between 3:1 and 6:1, but other ratios are also possible. Equipment can be built for extreme proportions.
One advantage with the method is that strict straightness tolerances or other tolerances for the canister can be obtained and, of course, that the canister can be produced at all. The requirement (in the case of square tubes) may be that a gauge with dimensions 153:153:4500 shall be passed through the cavity of the canister.
The finished canister shall primarily be used for storing spent nuclear fuel elements or other material and shall be sealed all around and at the ends in known manner with an outer casing of copper.
Brief description of the drawings: The method according to the invention is exemplified in the accompanying drawings. Figure 1 shows a longitudinal section of a canister to be cast and Figure 2 shows the same canister in cross section. Figure 3 shows a cross section through a parcel of square tubes.
Description of embodiment:
Figures 1 and 2 show a finished canister, in this case a parcel of twelve square tubes (2) which have been welded together to a parcel and filled with filler, after which pre-heating may be performed if necessary. The ratio between the canister length (L) and its diameter (D) is here 4.9:1. When the fuel elements have been placed in the canister it shall be surrounded by an outer casing of copper (1) and end pieces of the same material.
The welded parcel of tubes (Figures 1 and 2) is placed upright and fixed in the lower part or core of a casting mould. The other parts of the mould are positioned and the casting in steel is performed in vertical or horizontal position, e.g. through casting gates at different levels. The material of the tubes is normally steel, SS 1312, and the casting is performed in steel with a wall thickness of 10 mm. When the casting body has cooled the ladle lining is emptied out. One or more casting gates can be used at one or more levels, determined by casting weight, dimensions, etc.
Figure 3 shows the square tubes and the straight cavities (2) with bracing (5) welded between the tubes (2). After insertion of the elements the canister is enclosed in copper in known manner.
The method according to the invention can be varied in many ways within the scope of the following claims.

Claims

1. A method of manufacturing an oblong canister for storing spent nuclear fuel elements, characterized in that a bundle of tubes (2) the length of the canister are joined together to form a parcel around which a casing (9) of metal is cast.
2. A method as claimed in claim 1, characterized in that a number of tubes (2) are welded together as bracing (5) between the tubes, after which the parcel of tubes is filled with filler, e.g. ladle lining, and pre-heated if necessary.
3. A method as claimed in claim 2, characterized in that the pre-heated tube parcel is secured in the lower part of a casting mould and the other parts are positioned, after which casting of the casing is performed in vertical position.
4. A method as claimed in claims 1-3, characterized in that the welded parcel (2) consists of a number of square tubes.
5. A method as claimed in any of the preceding claims, characterized in that the tubes are straight and/ or parallel with each other.
6. A method as claimed in claims 1-3, characterized in that the casting is performed at different levels.
7. A method as claimed in any of the preceding claims, characterized in that the casing (9) consists of steel SS 1306.
PCT/SE1997/001658 1996-10-15 1997-10-03 Method of manufacturing oblong capsules WO1998016936A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9603757-7 1996-10-15
SE9603757A SE507525C2 (en) 1996-10-15 1996-10-15 Process for making elongated capsules for storing burnt out nuclear fuel elements

Publications (1)

Publication Number Publication Date
WO1998016936A1 true WO1998016936A1 (en) 1998-04-23

Family

ID=20404244

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1997/001658 WO1998016936A1 (en) 1996-10-15 1997-10-03 Method of manufacturing oblong capsules

Country Status (2)

Country Link
SE (1) SE507525C2 (en)
WO (1) WO1998016936A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004051671A1 (en) * 2002-11-29 2004-06-17 Oyster International N.V. A container device for the storage of hazardous material, particularly for the ultimate disposal of nuclear fuel, and installation for manufacturing it
RU2536441C1 (en) * 2013-07-16 2014-12-27 Федеральное Государственное унитарное предприятие "Российский Федеральный ядерный центр-Всероссийский научно-исследовательский институт экспериментальной физики-ФГУП "РФЯЦ-ВНИИЭФ" Cover for placing and storing spent fuel assemblies for rbmk-1000 reactor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3140020A1 (en) * 1981-10-08 1983-04-21 Kernforschungszentrum Karlsruhe Gmbh, 7500 Karlsruhe METHOD FOR PRODUCING A DENSITY AND HOMOGENEOUS CAST COVER FOR A CONTAINER WITH HIGH RADIOACTIVE CONTENT AND DEVICE FOR IMPLEMENTING THE METHOD
WO1995026029A1 (en) * 1994-03-24 1995-09-28 Transnucleaire Container including a wrought steel body with a non-circular cross-section for nuclear fuel assemblies
WO1995026030A1 (en) * 1994-03-22 1995-09-28 Transnucleaire S.A. Storage rack for nuclear fuel assemblies, essentially including a single contiguous tube bundle
US5550882A (en) * 1993-10-08 1996-08-27 Vectra Technologies, Inc. Containers for transportation and storage of spent nuclear fuel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3140020A1 (en) * 1981-10-08 1983-04-21 Kernforschungszentrum Karlsruhe Gmbh, 7500 Karlsruhe METHOD FOR PRODUCING A DENSITY AND HOMOGENEOUS CAST COVER FOR A CONTAINER WITH HIGH RADIOACTIVE CONTENT AND DEVICE FOR IMPLEMENTING THE METHOD
US5550882A (en) * 1993-10-08 1996-08-27 Vectra Technologies, Inc. Containers for transportation and storage of spent nuclear fuel
WO1995026030A1 (en) * 1994-03-22 1995-09-28 Transnucleaire S.A. Storage rack for nuclear fuel assemblies, essentially including a single contiguous tube bundle
WO1995026029A1 (en) * 1994-03-24 1995-09-28 Transnucleaire Container including a wrought steel body with a non-circular cross-section for nuclear fuel assemblies

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004051671A1 (en) * 2002-11-29 2004-06-17 Oyster International N.V. A container device for the storage of hazardous material, particularly for the ultimate disposal of nuclear fuel, and installation for manufacturing it
US7498594B2 (en) 2002-11-29 2009-03-03 Oyster International N.V. Container device for the storage of hazardous material, particularly for the ultimate disposal of nuclear fuel, and installation for manufacturing it
RU2536441C1 (en) * 2013-07-16 2014-12-27 Федеральное Государственное унитарное предприятие "Российский Федеральный ядерный центр-Всероссийский научно-исследовательский институт экспериментальной физики-ФГУП "РФЯЦ-ВНИИЭФ" Cover for placing and storing spent fuel assemblies for rbmk-1000 reactor

Also Published As

Publication number Publication date
SE9603757D0 (en) 1996-10-15
SE507525C2 (en) 1998-06-15
SE9603757L (en) 1998-04-16

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