Patent US4437578A successfully refreshed from Google Patents.
US4437578A
Expired / Lapsed
US
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Container and closure means for storage of radioactive material
Assignee: Steag Energy Services GmbH
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Filing: 1982-06-22
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Granted: 1984-03-20
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Expires: 2002-06-22
Abstract
Abstract In the final storage of radioactive substances in containers, these containers must be sealed so as to be gas-tight by means of a cover, before they are taken to the final storage place. In order to avoid thermal stress, which has up till now been customary, of the radioactive substances on the one hand and of the container and cover on the other hand, it is proposed that the container and the sealing cover should be suitably ground on their seating areas which cooperate with each other, and when the container is closed the cover is held by prestressing on the seating area of the container. In a preferred method, after grinding, a thin equalizing layer of a highly corrosion-resistant, deformable material is applied to at least one of the seating surfaces of the container and cover, in order to achieve a compensation for any roughness which may be present, which will improve the sealing, depending on the technically and/or economically possible extent of the grinding. It is also possible, however, to form the prestressing by means of a lapped contact.
Inventors
- 👤 Heinz Bienek
- 👤 Rudolf Finkbeiner
- 👤 Wilhelm Wick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:06
CPC Classifications
G; G21; G21F; G21F5/00; G21F5/06; G21F5/12; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
72 words
A method for closing with a cover a container for the final storage of radioactive substances, wherein at least one of the container and cover consists of a material selected from ceramic and metallic material, and wherein the container and cover are suitably ground in their seating areas which cooperate with each other, and when the container is closed the cover is held by prestressing on the seating area of the container.
Claim 2
Independent Claim
72 words
A method for closing with a cover a container for the final storage of radioactive substances, wherein at least one of the container and cover consists of a material selected from ceramic and metallic material, and wherein the container and cover are suitably ground in their seating areas which cooperate with each other, and when the container is closed the cover is held by prestressing on the seating area of the container.
Claim 3
Dependent Claim
21 words
A method according to claim 1, wherein the cover is pressed against the seating area of the container from the outside.
Claim 4
Dependent Claim
21 words
A method according to claim 1, wherein the cover is pulled against the seating area of the container from the inside.
Claim 5
Dependent Claim
33 words
A method according to claim 1, wherein, after grinding, a thin equalising layer of highly corrosion-resistant, deformable material is applied to at least one of the seating areas of the container and cover.
Claim 6
Dependent Claim
15 words
A method according to claim 4, wherein a prefabricated foil is applied as the layer.
Claim 7
Dependent Claim
15 words
A method according to claim 4, wherein the layer is mounted on the seating area.
Claim 8
Dependent Claim
18 words
A method according to claim 4, wherein a ductile metal is used as the material for the layer.
Claim 9
Dependent Claim
18 words
A method according to claim 4, wherein a deformable ceramic is applied as the material for the layer.
Claim 10
Dependent Claim
12 words
A method according to claim 1, wherein the prestressing force is resilient.
Claim 11
Dependent Claim
34 words
A method according to claim 1, wherein the container and cover are lapped on their seating areas in such a way that the prestressing is effected by the forces acting between the lapped surfaces.
Claim 12
Dependent Claim
25 words
A method according to claim 1, wherein outside the seating area of the cover a further seal is formed between the cover and the container.
Claim 13
Dependent Claim
84 words
A storage device consisting of a container for the final storage of radioactive substances and a cover for the container, wherein one of the container and cover consists of a material selected from ceramic and metallic material, and wherein the container and cover are suitably ground on their seating areas which cooperate with each other, and a prestressing device is provided which is supported on the container and engages the cover, this prestressing device prestressing the cover against the seating area of the container.
Claim 14
Dependent Claim
84 words
A storage device consisting of a container for the final storage of radioactive substances and a cover for the container, wherein one of the container and cover consists of a material selected from ceramic and metallic material, and wherein the container and cover are suitably ground on their seating areas which cooperate with each other, and a prestressing device is provided which is supported on the container and engages the cover, this prestressing device prestressing the cover against the seating area of the container.
Claim 15
Dependent Claim
20 words
A storage device according to claim 12, wherein the prestressing device is supported on the container in a form-locking manner.
Claim 16
Dependent Claim
17 words
A storage device according to claim 12, wherein the prestressing device is supported tensionally on the container.
Claim 17
Dependent Claim
30 words
A storage device according to claim 12, wherein the prestressing device is a pressure device engaging with the cover from the outside which can transfer underground pressure to the cover.
Claim 18
Dependent Claim
22 words
A storage device according to claim 12, wherein the prestressing device is a tensioning device engaging with the cover from the inside.
Claim 19
Dependent Claim
24 words
A storage device according to claim 12, wherein the prestressing device has at least one flexible element inserted between the cover and the container.
Claim 20
Dependent Claim
27 words
A storage device according to claim 12, wherein an equalising layer is provided between the seating areas of the container and cover which engage with each other.
Claim 21
Dependent Claim
38 words
A storage device according to claim 12, wherein in a gap between the inner wall of the container and the outer wall of the cover, an annular seal is provided which can be acted upon from the outside.
Claim 22
Dependent Claim
38 words
A storage device according to claim 12, wherein in a gap between the inner wall of the container and the outer wall of the cover, a sealing agent is provided which can be acted upon from the outside.
Claim 23
Dependent Claim
72 words
A storage device according to claim 19, wherein the annular seal is arranged between a pressure cover, passing on the initial stress in the direction of the sealing cover, and the sealing cover in such a way that the annular seal transfers the initial stress to the sealing cover and, under action of underground pressure, this annular seal can be deformed until the pressure cover is in contact with the sealing cover.
Claim 24
Dependent Claim
41 words
A storage device according to claim 19, wherein the annular seal has a wedge-shaped section lying on the outside and extending in the direction of the axis of the container, and an annular section extending at right angles to the container.
Claim 25
Dependent Claim
20 words
A storage device according to claim 12, wherein a buffer layer is arranged between the prestressing device and the cover.
Claim 26
Dependent Claim
79 words
A storage device consisting of a container for the final storage of radioactive substances and a cover for the container, wherein at least one of the container and cover consists of a material selected from ceramic and metallic material, the container and cover are suitably lapped on their seating areas which cooperate with each other in such a way that the cover is prestressed against the seating area of the container by the forces acting between the lapped surfaces.
Claim 27
Dependent Claim
79 words
A storage device consisting of a container for the final storage of radioactive substances and a cover for the container, wherein at least one of the container and cover consists of a material selected from ceramic and metallic material, the container and cover are suitably lapped on their seating areas which cooperate with each other in such a way that the cover is prestressed against the seating area of the container by the forces acting between the lapped surfaces.
Claim 28
Dependent Claim
26 words
A storage device according to claim 24, wherein a locking element is added to the container and cover, which prevents relative displacement along the seating areas.
Claim 29
Dependent Claim
26 words
A storage device according to claim 25, wherein the locking element is fixed to one of the container and cover by means of a ceramic adhesive.
Claim 30
Dependent Claim
29 words
A storage device according to claim 12, wherein the seating areas are rotational surfaces selected from straight circular surfaces connected with each other, conical surfaces and partly spherical surfaces.
Claim 31
Dependent Claim
26 words
A storage device according to claim 12, wherein the cross-section of the feed opening is smaller than the cross-section of the receiving opening of the container.
Claim 32
Dependent Claim
16 words
A storage device according to claim 12, wherein the receiving opening is surrounded by a collar.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-20 | 1987-09-19 | 1988-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-20 | 1991-09-19 | 1992-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-20 | 1995-09-19 | 1996-03-20 | $7700.00 | Window Closed / Lapsed |