CA1201221A - Method of sealing containers for storing radioactive materials - Google Patents
Method of sealing containers for storing radioactive materialsInfo
- Publication number
- CA1201221A CA1201221A CA000420081A CA420081A CA1201221A CA 1201221 A CA1201221 A CA 1201221A CA 000420081 A CA000420081 A CA 000420081A CA 420081 A CA420081 A CA 420081A CA 1201221 A CA1201221 A CA 1201221A
- Authority
- CA
- Canada
- Prior art keywords
- vessel
- cover
- joint surfaces
- container
- ceramic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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
- G21F5/06—Details of, or accessories to, the containers
- G21F5/12—Closures for containers; Sealing arrangements
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Closures For Containers (AREA)
- Fuel Cell (AREA)
- Gasket Seals (AREA)
- Packages (AREA)
- Closing Of Containers (AREA)
Abstract
Abstract of the Disclosure The invention is directed to a method for closing and sealing a ceramic container for the long-term storage of irradiated nuclear reactor fuel elements or other radioactive materials. The container includes a vessel having an opening of one end thereof, and a cover adapted to fit on the vessel to close the opening. To tightly seal and close the container with respect to the ambient, the vessel and cover are joined by metal solder. A good connection between the vessel and cover is achieved. A container that can be tightly sealed and closed with respect to the ambient by the methods of the invention is also disclosed.
Description
2~
The invention relates to a method of tightly sealing a ceramic container for the long-term storage of radioactive materials such as irradiated nuclear reactor Euel elements.
The invention also relates to such a container.
For the long-term storage or the direct terminal storage oE irradiated nuclear fuels, cemaric containers have also been suggested in addition to metal containers. These ceramic containers have the required strength and maintain the needed chemical stability over the long period of time required for the storage of such materials.
According to the present invention there is provided a method of loading and tightly sealing a ceramic container in a hot cell of a nuclear facility for the long-term storage of radioactive materials, the container comprising a ceramic vessel having an opening at one end thereof, and a ceramic cover adapted to fit on the vessel to close the opening, an upper end portion of the vessel and the peripheral portion of the cover defining respective joint surfaces which are mutually adjacent and conjointly define a partition interface between the vessel and the cover when the cover is sea-ted on said vessel, the method comprising the steps of:
- placing the vessel, the cover and a solder form piece in the hot cell;
- loading the vessel with the radioactive materials;
- applying heat to the partition interface and to said form piece sandwiched between said vessel and said cover while said container is still in the hot cell causing said form piece to flow thereby wetting said joint surfaces.
With the method of the invention, it has been shown that a good joint is achieved between the cover and the vessel of the container. Because of the invention, a simple technique is made possible for closing the container in a so-called hot cell.
2~
According to one aspect of the present invention, there is provided a method of loading and tightly sealing a ceramic container in a hot cell of a nuclear facility for the long-term storage of radioactive materials such as irradiated nuclear reactor fuel elements, the container including: a ceramic vessel having an opening at one end thereof; and, a ceramic cover adapted to fit on the vessel to close the open-ing; the vessel having a base and a wall extending upwardly from said base, the wall terminating in an upper end portion defining the opening;.- the cover having a peripheral portion for engaging the vessel; the upperend portion of the vessel and the peripheral portion of the cover defining respective joint surfaces, said joint surfaces being mutually adjacent and conjoi.ntly defining a partition interface between said vessel and said cover when said cover is seated on said vessel, the method comprising the steps of:
placing the vessel, the cover and a solder form piece in the hot cell;
loading the vessel with the radioactive materials;
placing the solder form piece between the joint surfaces wnile the vessel and the cover are in the hot cell;
and, applying heat to the partition interface and said form piece while said container is still in the hot cell and causing said form piece to flow thereby wetting said joint surfaces.
According to another preferred embodiment there is provided a method of loading and sealing, in a hot cell of a nuclear facility, a ceramic container for the long-term storage of radioactive materials such as irradiated nuclear reactor fuel elements, the container including a ceramic vessel having a base and a wall extending upwardly from said base, the wall terminating in an upper end portion;
and, a ceramic cover having a peripheral portion for engaging the vessel; the upper end portion of the vessel and the peripheral portion of the cover defining respective joint surfaces, said joint surfaces being mutually adjacent and conjointly defining a partition interface between said vessel and said cover when said cover is seated on said vessel, the method comprising the steps of:
placing the container and a preformed annular solder piece in the hot cell;
loading the ceramic vessel with the radioactive l material to be stored therein;
placing the preformed annular solder piece on said joint surface of said ceramic vessel while the vessel and -the cover are in the hot cell placing the ceramic cover upon said vessel to sand--wich said solder piece between said joint surfaces;
applying heat to the partition interface and to said solder piece whi.le the container is still in the hot cell and causing said form piece to flow thereby wetting said joint surfaces; and, discontinuing the application of said heat thereby permitting said partition interface to cool so that a seal-tight joint is formed between said vessel and said cover.
In this preferred embodiment the solder form pieces are made to have the profile required for accommoda-ting the container and are placed between the joint surfaces. By means of an appropriate heating apparatus, the temperature is raised until the solder runs and spreads in the area of the joint surfaces whereby joining forces become effective between the parts being joined by the solder. This embodiment of the method of the invention is especially suited for placing the metal solder piece on the vessel in the hot cell after the latter has been loaded with the nuclear fuel material.
According to another preferred embodiment, there is provided a method of loading and sealing, in a hot cell, a container for the long-term storage o radioactive materials such as irradiated nuclear reactor fuel elements, the container including a vessel having a base and a wall extending upwardly from said base, the wall terminating in an upper end portion;
the cover having a peripheral portion for engaging the vessel;
the upper end portion of the vessel and the peripheral portion of the cover defining respective joint surfaces, said joint surfaces being mutually adjacent and defining the partition interface between said vessel and said cover when said cover is seated on said vessel, the method comprising the steps of:
precoating said respective joint surfaces of said vessel and said cover with metal solder outside of the hot cell;
placing said vessel and said cover in the hot cell;
loading said vessel in the hot cell with the radio-active material to be stored;
placing said cover on said vessel so as -to cause said precoated joint surfaces to be in contact with each other;
applying heat to the metal solder coatings on said joint surfaces thereby causing said coatings to melt; and discontinuing the application of said heat thereby permitting said solder to cool so that a seal-tight joint is formed between said vessel and said cover.
In this last-mentioned preferred embodiment, the joint surfaces are already precoated outside of the hot cell with a metal layer of solder. During the operation of closing the container in the hot cell, only a short-time melting of the solder is required. The basic material of which the vessel and container are made do not have to be heated to the temperature of solder in this method embodiment of the invention. This relatively simple melting of the solder coating can be achieved with a simple inductive warming of the solder coatings.
- 3a -According to the present invention there is also provided a container for the long-term storage of radioactive comprising:
- a ceramic vessel having an opening at one end thereof;
- a ceramic cover adapted to fit on the vessel to close the opening;
- an upper end portion of the vessel and a peripheral portion of the cover defining respective joint surfaces, said joint surfaces being mutually adjacent and conjointly defining a partition interface between said vessel and said cover when said cover is seated on said vessel, - a solder form piece being disposed at the inter-face of said cover and said vessel.
Preferred embodiments of the invention will now be described as examples, without limitative manner, with refer-ence to the drawing wherein:
FIG. 1 is an elevation view, in section, illustra-ting a ceramic container of the invention which is closed and tightly sealed with respect to the ambient pursuant to a method according to one embodiment of the invention; and FIG. 2 is an elevation view, in section, showing a ceramic container wherein the joint surfaces have been precoated pursuant to another embodiment of the method according to the invention.
The ceramic container shown in FIG. l includes a vessel l of cylindrical configuration and open at one end.
Reference numeral 2 designates the cover of the container.
An annular form piece 3 made of metal solder is sandwiched between the vessel l and the cover 2. The joint surfaces 4 and 5 of the vessel l and cover 2, respectively, are configured so as to have a stepped profile. The metal solder form piece 3 is - 3b -formed to correspond -to this stepped profile.
The container is loaded with irradiated nuclear fuel ma-terial in a shielded room which is a so-called hot cell.
This loading operation is conducted with remotely-controlled apparatus. When the vessel 1 is loaded wi-th irradiated nuclear fuel materials, the annular or ring-shaped solder form piece 3 is placed upon the joint surface 4 of vessel 1. The cover 2 has a joint surface 5 formed to correspond to that of the joint surface 4 of the vessel. AEter placing the form piece 3 in position, the cover 2 is placed upon the ring-shaped solder form piece 3 so that the latter is sandwiched between the vessel and cover.
By means of an appropriate heating device (not shown), the solder form piece 3 as well as the vessel 1 and cover 2 are heated in the area of the par-tition interface to the extent that the solder melts and wets the joint surfaces whereafter connecting forces between the vessel and cover become effective.
The vessel 1 and cover 2 can be made of A12o3. TiPd -solder is used as the metal solder because titanium has a high affinity to oxygen.
FIG. 2 shows how the vessel 11 and cover 12 of a ceramic container can be precoated with metal solder at their respective joint surfaces 14 and 15. According to another embodiment of a method of the invention, these precoatings 16 and 17 are applied outside of the hot cell. In this way, the vessel and cover are equipped with the solder coa-tings when they are brought into the hot cell thereby reducing the steps which have to be performed in this facility. This is a very substantial advantage because operations in a hot cell such as placing pieces of a container assembly in position must be 2~
performed with remotely-controlled apparatus. Thus, in this embodiment of the method of the invention, the step of placing a solder form piece in position is eliminated.
After the vessel is filled with radioactive waste in the hot cell, heat is applied inductively to only the solder coatings 16 and 17 and only for a time long enough to cause the solder to melt. The induction heating device is shown schematically in FIG. and is identified therein by reference numeral 18. With this embodiment, the ceramic material of the vessel 11 and cover 12 does not have to be raised to the soldering temperature.
It is understood that the foregoing description is that of the preferred embodiments of the invention and that various changes and modifications may be made thereto without departing from the spirit and scope of the invention, as defined in the appended claims.
The invention relates to a method of tightly sealing a ceramic container for the long-term storage of radioactive materials such as irradiated nuclear reactor Euel elements.
The invention also relates to such a container.
For the long-term storage or the direct terminal storage oE irradiated nuclear fuels, cemaric containers have also been suggested in addition to metal containers. These ceramic containers have the required strength and maintain the needed chemical stability over the long period of time required for the storage of such materials.
According to the present invention there is provided a method of loading and tightly sealing a ceramic container in a hot cell of a nuclear facility for the long-term storage of radioactive materials, the container comprising a ceramic vessel having an opening at one end thereof, and a ceramic cover adapted to fit on the vessel to close the opening, an upper end portion of the vessel and the peripheral portion of the cover defining respective joint surfaces which are mutually adjacent and conjointly define a partition interface between the vessel and the cover when the cover is sea-ted on said vessel, the method comprising the steps of:
- placing the vessel, the cover and a solder form piece in the hot cell;
- loading the vessel with the radioactive materials;
- applying heat to the partition interface and to said form piece sandwiched between said vessel and said cover while said container is still in the hot cell causing said form piece to flow thereby wetting said joint surfaces.
With the method of the invention, it has been shown that a good joint is achieved between the cover and the vessel of the container. Because of the invention, a simple technique is made possible for closing the container in a so-called hot cell.
2~
According to one aspect of the present invention, there is provided a method of loading and tightly sealing a ceramic container in a hot cell of a nuclear facility for the long-term storage of radioactive materials such as irradiated nuclear reactor fuel elements, the container including: a ceramic vessel having an opening at one end thereof; and, a ceramic cover adapted to fit on the vessel to close the open-ing; the vessel having a base and a wall extending upwardly from said base, the wall terminating in an upper end portion defining the opening;.- the cover having a peripheral portion for engaging the vessel; the upperend portion of the vessel and the peripheral portion of the cover defining respective joint surfaces, said joint surfaces being mutually adjacent and conjoi.ntly defining a partition interface between said vessel and said cover when said cover is seated on said vessel, the method comprising the steps of:
placing the vessel, the cover and a solder form piece in the hot cell;
loading the vessel with the radioactive materials;
placing the solder form piece between the joint surfaces wnile the vessel and the cover are in the hot cell;
and, applying heat to the partition interface and said form piece while said container is still in the hot cell and causing said form piece to flow thereby wetting said joint surfaces.
According to another preferred embodiment there is provided a method of loading and sealing, in a hot cell of a nuclear facility, a ceramic container for the long-term storage of radioactive materials such as irradiated nuclear reactor fuel elements, the container including a ceramic vessel having a base and a wall extending upwardly from said base, the wall terminating in an upper end portion;
and, a ceramic cover having a peripheral portion for engaging the vessel; the upper end portion of the vessel and the peripheral portion of the cover defining respective joint surfaces, said joint surfaces being mutually adjacent and conjointly defining a partition interface between said vessel and said cover when said cover is seated on said vessel, the method comprising the steps of:
placing the container and a preformed annular solder piece in the hot cell;
loading the ceramic vessel with the radioactive l material to be stored therein;
placing the preformed annular solder piece on said joint surface of said ceramic vessel while the vessel and -the cover are in the hot cell placing the ceramic cover upon said vessel to sand--wich said solder piece between said joint surfaces;
applying heat to the partition interface and to said solder piece whi.le the container is still in the hot cell and causing said form piece to flow thereby wetting said joint surfaces; and, discontinuing the application of said heat thereby permitting said partition interface to cool so that a seal-tight joint is formed between said vessel and said cover.
In this preferred embodiment the solder form pieces are made to have the profile required for accommoda-ting the container and are placed between the joint surfaces. By means of an appropriate heating apparatus, the temperature is raised until the solder runs and spreads in the area of the joint surfaces whereby joining forces become effective between the parts being joined by the solder. This embodiment of the method of the invention is especially suited for placing the metal solder piece on the vessel in the hot cell after the latter has been loaded with the nuclear fuel material.
According to another preferred embodiment, there is provided a method of loading and sealing, in a hot cell, a container for the long-term storage o radioactive materials such as irradiated nuclear reactor fuel elements, the container including a vessel having a base and a wall extending upwardly from said base, the wall terminating in an upper end portion;
the cover having a peripheral portion for engaging the vessel;
the upper end portion of the vessel and the peripheral portion of the cover defining respective joint surfaces, said joint surfaces being mutually adjacent and defining the partition interface between said vessel and said cover when said cover is seated on said vessel, the method comprising the steps of:
precoating said respective joint surfaces of said vessel and said cover with metal solder outside of the hot cell;
placing said vessel and said cover in the hot cell;
loading said vessel in the hot cell with the radio-active material to be stored;
placing said cover on said vessel so as -to cause said precoated joint surfaces to be in contact with each other;
applying heat to the metal solder coatings on said joint surfaces thereby causing said coatings to melt; and discontinuing the application of said heat thereby permitting said solder to cool so that a seal-tight joint is formed between said vessel and said cover.
In this last-mentioned preferred embodiment, the joint surfaces are already precoated outside of the hot cell with a metal layer of solder. During the operation of closing the container in the hot cell, only a short-time melting of the solder is required. The basic material of which the vessel and container are made do not have to be heated to the temperature of solder in this method embodiment of the invention. This relatively simple melting of the solder coating can be achieved with a simple inductive warming of the solder coatings.
- 3a -According to the present invention there is also provided a container for the long-term storage of radioactive comprising:
- a ceramic vessel having an opening at one end thereof;
- a ceramic cover adapted to fit on the vessel to close the opening;
- an upper end portion of the vessel and a peripheral portion of the cover defining respective joint surfaces, said joint surfaces being mutually adjacent and conjointly defining a partition interface between said vessel and said cover when said cover is seated on said vessel, - a solder form piece being disposed at the inter-face of said cover and said vessel.
Preferred embodiments of the invention will now be described as examples, without limitative manner, with refer-ence to the drawing wherein:
FIG. 1 is an elevation view, in section, illustra-ting a ceramic container of the invention which is closed and tightly sealed with respect to the ambient pursuant to a method according to one embodiment of the invention; and FIG. 2 is an elevation view, in section, showing a ceramic container wherein the joint surfaces have been precoated pursuant to another embodiment of the method according to the invention.
The ceramic container shown in FIG. l includes a vessel l of cylindrical configuration and open at one end.
Reference numeral 2 designates the cover of the container.
An annular form piece 3 made of metal solder is sandwiched between the vessel l and the cover 2. The joint surfaces 4 and 5 of the vessel l and cover 2, respectively, are configured so as to have a stepped profile. The metal solder form piece 3 is - 3b -formed to correspond -to this stepped profile.
The container is loaded with irradiated nuclear fuel ma-terial in a shielded room which is a so-called hot cell.
This loading operation is conducted with remotely-controlled apparatus. When the vessel 1 is loaded wi-th irradiated nuclear fuel materials, the annular or ring-shaped solder form piece 3 is placed upon the joint surface 4 of vessel 1. The cover 2 has a joint surface 5 formed to correspond to that of the joint surface 4 of the vessel. AEter placing the form piece 3 in position, the cover 2 is placed upon the ring-shaped solder form piece 3 so that the latter is sandwiched between the vessel and cover.
By means of an appropriate heating device (not shown), the solder form piece 3 as well as the vessel 1 and cover 2 are heated in the area of the par-tition interface to the extent that the solder melts and wets the joint surfaces whereafter connecting forces between the vessel and cover become effective.
The vessel 1 and cover 2 can be made of A12o3. TiPd -solder is used as the metal solder because titanium has a high affinity to oxygen.
FIG. 2 shows how the vessel 11 and cover 12 of a ceramic container can be precoated with metal solder at their respective joint surfaces 14 and 15. According to another embodiment of a method of the invention, these precoatings 16 and 17 are applied outside of the hot cell. In this way, the vessel and cover are equipped with the solder coa-tings when they are brought into the hot cell thereby reducing the steps which have to be performed in this facility. This is a very substantial advantage because operations in a hot cell such as placing pieces of a container assembly in position must be 2~
performed with remotely-controlled apparatus. Thus, in this embodiment of the method of the invention, the step of placing a solder form piece in position is eliminated.
After the vessel is filled with radioactive waste in the hot cell, heat is applied inductively to only the solder coatings 16 and 17 and only for a time long enough to cause the solder to melt. The induction heating device is shown schematically in FIG. and is identified therein by reference numeral 18. With this embodiment, the ceramic material of the vessel 11 and cover 12 does not have to be raised to the soldering temperature.
It is understood that the foregoing description is that of the preferred embodiments of the invention and that various changes and modifications may be made thereto without departing from the spirit and scope of the invention, as defined in the appended claims.
Claims (9)
1. Method of loading and tightly sealing a ceramic container in a hot cell of a nuclear facility for the long-term storage of radioactive materials, the container compris-ing a ceramic vessel having an opening at one end thereof, and a ceramic cover adapted to fit on the vessel to close the opening, an upper end portion of the vessel and the peripheral portion of the cover defining respective joint surfaces which are mutually adjacent and conjointly define a partition inter-face between the vessel and the cover when the cover is seated on said vessel, the method comprising the steps of:
placing the vessel, the cover and a solder form piece in the hot cell.;
loading the vessel with the radioactive materials;
applying heat to the partition interface and to said form piece sandwiched between said vessel and said cover while said container is still in the hot cell causing said form piece to flow thereby wetting said joint surfaces.
placing the vessel, the cover and a solder form piece in the hot cell.;
loading the vessel with the radioactive materials;
applying heat to the partition interface and to said form piece sandwiched between said vessel and said cover while said container is still in the hot cell causing said form piece to flow thereby wetting said joint surfaces.
2. Method of loading and tightly sealing a ceramic container in a hot cell of a nuclear facility for the long-term storage of radioactive materials such as irradiated nuclear reactor fuel elements, the container including: a ceramic vessel having an opening at one end thereof; and, a ceramic cover adapted to fit on the vessel to close the opening; the vessel having a base and a wall extending upwardly from said base, the wall terminating in an upper end portion defining the opening; the cover having a peripheral portion for engaging the vessel; the upper end portion of the vessel and the peripheral portion of the cover defining respective joint surfaces, said joint surfaces being mutually adjacent and conjointly defining a partition interface between said vessel and said cover when said cover is seated on said vessel, the method comprising the steps of:
placing the vessel, the cover and a solder form piece in the hot cell;
loading the vessel with the radioactive materials;
placing the solder form piece between the joint surfaces while the vessel and the cover are in the hot cell;
and, applying heat to the partition interface and said form piece while said container is still in the hot cell and causing said form piece to flow thereby wetting said joint surfaces.
placing the vessel, the cover and a solder form piece in the hot cell;
loading the vessel with the radioactive materials;
placing the solder form piece between the joint surfaces while the vessel and the cover are in the hot cell;
and, applying heat to the partition interface and said form piece while said container is still in the hot cell and causing said form piece to flow thereby wetting said joint surfaces.
3. Method of loading and tightly sealing a ceramic container in a hot cell of a nuclear facility for the long term storage of radioactive materials, the container comprising a vessel having a base and a wall extending upwardly from said base, the wall terminating in an upper end portion; the cover having a peripheral portion for engaging the vessel; the upper end portion of the vessel and the peripheral portion of the cover defining respective joint surfaces, said joint surfaces being mutually adjacent and defining the partition interface between said vessel and said cover when said cover is seated on said vessel; the method comprising the steps of:
precoating each of said joint surfaces with a layer of metal solder;
loading said vessel with the radioactive materials to be stored therein;
placing said cover on said vessel;
heating said interface thereby causing said metal solder layers to flow; and, allowing said heated partition interface to cool thereby forming a tight joint between said vessel and said cover.
precoating each of said joint surfaces with a layer of metal solder;
loading said vessel with the radioactive materials to be stored therein;
placing said cover on said vessel;
heating said interface thereby causing said metal solder layers to flow; and, allowing said heated partition interface to cool thereby forming a tight joint between said vessel and said cover.
4. A method of loading and sealing, in a hot cell of a nuclear facility, a ceramic container for the long-term storage of radioactive materials such as irradiated nuclear reactor fuel elements, the container including a ceramic vessel having a base and a wall extending upwardly from said base, the wall terminating in an upper end portion;
and, a ceramic cover having a peripheral portion for engaging the vessel; the upper end portion of the vessel and the peripheral portion of the cover defining respective joint surfaces, said joint surfaces being mutually adjacent and conjointly defining a partition interface between said vessel and said cover when said cover is seated on said vessel, the method comprising the steps of:
placing the container and a preformed annular solder piece in the hot cell;
loading the ceramic vessel with the radioactive material to be stored therein;
placing the preformed annular solder piece on said joint surface of said ceramic vessel while the vessel and the cover are in the hot cell;
placing the ceramic cover upon said vessel to sandwich said solder piece between said joint surfaces;
applying heat to the partition interface and to said solder piece while the container is still in the hot cell and causing said form piece to flow thereby wetting said joint surfaces; and, discontinuing the application of said heat thereby permitting said partition interface to cool so that a seal-tight joint is formed between said vessel and said cover.
and, a ceramic cover having a peripheral portion for engaging the vessel; the upper end portion of the vessel and the peripheral portion of the cover defining respective joint surfaces, said joint surfaces being mutually adjacent and conjointly defining a partition interface between said vessel and said cover when said cover is seated on said vessel, the method comprising the steps of:
placing the container and a preformed annular solder piece in the hot cell;
loading the ceramic vessel with the radioactive material to be stored therein;
placing the preformed annular solder piece on said joint surface of said ceramic vessel while the vessel and the cover are in the hot cell;
placing the ceramic cover upon said vessel to sandwich said solder piece between said joint surfaces;
applying heat to the partition interface and to said solder piece while the container is still in the hot cell and causing said form piece to flow thereby wetting said joint surfaces; and, discontinuing the application of said heat thereby permitting said partition interface to cool so that a seal-tight joint is formed between said vessel and said cover.
5. A method of loading and sealing, in a hot cell, a container for the long-term storage of radioactive materials such as irradiated nuclear reactor fuel elements, the con-tainer including a vessel having a base and a wall extending upwardly from said base, the wall termnating in an upper end portion; the cover having a peripheral portion for engaging the vessel; the upper end portion of the vessel and the peripheral portion of the cover defining respective joint surfaces, said joint surfaces being mutually adjacent and defining the partition interface between said vessel and said cover when said cover is seated on said vessel, the method comprising the steps of:
precoating said respective joint surfaces of said vessel and said cover with metal solder outside of the hot cell;
placing said vessel and said cover in the hot cell;
loading said vessel in the hot cell with the radio-active material to be stored;
placing said cover on said vessel so as to cause said precoated joint surfaces to be in contact with each other;
applying heat to the metal solder coatings on said joint surfaces thereby causing said coatings to melt; and discontinuing the application of said heat thereby permitting said solder to cool so that a seal-tight joint is formed between said vessel and said cover.
precoating said respective joint surfaces of said vessel and said cover with metal solder outside of the hot cell;
placing said vessel and said cover in the hot cell;
loading said vessel in the hot cell with the radio-active material to be stored;
placing said cover on said vessel so as to cause said precoated joint surfaces to be in contact with each other;
applying heat to the metal solder coatings on said joint surfaces thereby causing said coatings to melt; and discontinuing the application of said heat thereby permitting said solder to cool so that a seal-tight joint is formed between said vessel and said cover.
6. The method of claim 5, wherein said heat is applied only to said solder coatings.
7. The method of claim 5, wherein the application of heat is by induction soldering.
8. A container for the long-term storage of radioactive materials, comprising:
- a ceramic vessel having an opening at one end thereof;
- a ceramic cover adapted to fit on the vessel to close the opening;
- an upper end portion of the vessel and a peripheral portion of the cover defining respective joint surfaces, said joint surfaces being mutually adjacent and conjointly defining a partition interface between said vessel and said cover when said cover is seated on said vessel, - a solder form piece being disposed at the interface of said cover and said vessel.
- a ceramic vessel having an opening at one end thereof;
- a ceramic cover adapted to fit on the vessel to close the opening;
- an upper end portion of the vessel and a peripheral portion of the cover defining respective joint surfaces, said joint surfaces being mutually adjacent and conjointly defining a partition interface between said vessel and said cover when said cover is seated on said vessel, - a solder form piece being disposed at the interface of said cover and said vessel.
9. A container according to claim 8, wherein said solder form piece is annular and has a step-like radial section.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19823201884 DE3201884A1 (en) | 1982-01-22 | 1982-01-22 | METHOD FOR CLOSING CONTAINERS CONTAINING RADIOACTIVE SUBSTANCES |
| DEP3201884.3 | 1982-01-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1201221A true CA1201221A (en) | 1986-02-25 |
Family
ID=6153625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000420081A Expired CA1201221A (en) | 1982-01-22 | 1983-01-24 | Method of sealing containers for storing radioactive materials |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0084840B1 (en) |
| JP (1) | JPS58171700A (en) |
| BR (1) | BR8300194A (en) |
| CA (1) | CA1201221A (en) |
| DE (2) | DE3201884A1 (en) |
| ES (1) | ES519263A0 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3334660A1 (en) * | 1983-09-24 | 1985-04-11 | Steag Kernenergie Gmbh, 4300 Essen | METHOD FOR CLOSING A CONTAINER FOR THE STORAGE OF RADIOACTIVE SUBSTANCES |
| DE3447278A1 (en) * | 1984-12-22 | 1986-06-26 | Kernforschungszentrum Karlsruhe Gmbh, 7500 Karlsruhe | LONG-TERM CORROSION PROTECTION COVER FOR TIGHTLY CLOSED CONTAINERS WITH HIGH RADIOACTIVE CONTENT |
| DE102012101300B3 (en) * | 2012-02-17 | 2013-04-18 | Nuclear Cargo + Service Gmbh | Locking device for containers for transporting radioactive substances |
| JP2013181858A (en) * | 2012-03-02 | 2013-09-12 | Tadashi Matsui | Method for treating radioactive contaminant |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1264489A (en) * | 1960-03-17 | 1961-06-23 | Commissariat Energie Atomique | Improvements to radioactive sources |
| FR1347402A (en) * | 1963-01-23 | 1963-12-27 | Lemer & Cie | Improvements to armored containers and packaging intended for the transport of radioelements |
| US4209420A (en) * | 1976-12-21 | 1980-06-24 | Asea Aktiebolag | Method of containing spent nuclear fuel or high-level nuclear fuel waste |
| US4115311A (en) * | 1977-03-10 | 1978-09-19 | The United States Of America As Represented By The United States Department Of Energy | Nuclear waste storage container with metal matrix |
| DE2942092C2 (en) * | 1979-10-18 | 1985-01-17 | Steag Kernenergie Gmbh, 4300 Essen | Final storage containers for radioactive waste, in particular irradiated nuclear reactor fuel elements |
| SE425707B (en) * | 1981-03-20 | 1982-10-25 | Asea Ab | WAY TO INCLUDE BURNING NUCLEAR FUEL RODS IN A COPPER CONTAINER |
-
1982
- 1982-01-22 DE DE19823201884 patent/DE3201884A1/en not_active Withdrawn
-
1983
- 1983-01-17 BR BR8300194A patent/BR8300194A/en unknown
- 1983-01-18 EP EP83100375A patent/EP0084840B1/en not_active Expired
- 1983-01-18 ES ES519263A patent/ES519263A0/en active Granted
- 1983-01-18 DE DE8383100375T patent/DE3361648D1/en not_active Expired
- 1983-01-21 JP JP58007503A patent/JPS58171700A/en active Pending
- 1983-01-24 CA CA000420081A patent/CA1201221A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58171700A (en) | 1983-10-08 |
| BR8300194A (en) | 1983-10-11 |
| DE3361648D1 (en) | 1986-02-13 |
| ES8404555A1 (en) | 1984-04-16 |
| DE3201884A1 (en) | 1983-08-04 |
| EP0084840B1 (en) | 1986-01-02 |
| EP0084840A1 (en) | 1983-08-03 |
| ES519263A0 (en) | 1984-04-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |