US3713459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removable covers for apertures in pressure vessels
Assignee: United Kingdom Atomic Energy Authority
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Filing: 1969-05-26
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Granted: 1973-01-30
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Expires: 1989-05-26
Abstract
Abstract A prestressed concrete pressure vessel has penetrations in the wall which should be capable of being closed by removable closure members which offer the same security against fracture as the vessel itself. The invention provides such a closure member which comprises a prestressed concrete portion and bonded thereto a steel portion through which the releasable fastening of the closure member to the pressure vessel is made.
Inventors
- 👤 Iver R Mc
- 👤 F Marchbank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:09
CPC Classifications
G; G21; G21C; G21C13/00; G21C13/02; G21C13/06; G21C13/073; Y; Y02; Y02E; Y02E30/00; Y02E30/30; Y10; Y10T; Y10T137/00; Y10T137/6851; Y10T137/6966; Y10T137/6969
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
128 words
A prestressed concrete pressure vessel for a nuclear reactor core having a wall which contains the full working pressure of the reactor, means in the wall defining a penetration, a removable closure member closing said penetration, the closure member being at least in part prestressed independently of the vessel and having a concrete portion overlying a metal sheet portion which lies on the high pressure side of the member, means securing the closure member to the pressure vessel wall, at least one duct penetrating both metal sheet and the concrete portion, a shutter tube lining the duct and heat break means insulating the interior of the duct from the shutter tube, with a metal plate closing the end of the duct, spaced axially inwardly from the closure member.
Claim 2
Dependent Claim
128 words
A prestressed concrete pressure vessel for a nuclear reactor core having a wall which contains the full working pressure of the reactor, means in the wall defining a penetration, a removable closure member closing said penetration, the closure member being at least in part prestressed independently of the vessel and having a concrete portion overlying a metal sheet portion which lies on the high pressure side of the member, means securing the closure member to the pressure vessel wall, at least one duct penetrating both metal sheet and the concrete portion, a shutter tube lining the duct and heat break means insulating the interior of the duct from the shutter tube, with a metal plate closing the end of the duct, spaced axially inwardly from the closure member.
Claim 3
Dependent Claim
128 words
A prestressed concrete pressure vessel for a nuclear reactor core having a wall which contains the full working pressure of the reactor, means in the wall defining a penetration, a removable closure member closing said penetration, the closure member being at least in part prestressed independently of the vessel and having a concrete portion overlying a metal sheet portion which lies on the high pressure side of the member, means securing the closure member to the pressure vessel wall, at least one duct penetrating both metal sheet and the concrete portion, a shutter tube lining the duct and heat break means insulating the interior of the duct from the shutter tube, with a metal plate closing the end of the duct, spaced axially inwardly from the closure member.
Claim 4
Dependent Claim
128 words
A prestressed concrete pressure vessel for a nuclear reactor core having a wall which contains the full working pressure of the reactor, means in the wall defining a penetration, a removable closure member closing said penetration, the closure member being at least in part prestressed independently of the vessel and having a concrete portion overlying a metal sheet portion which lies on the high pressure side of the member, means securing the closure member to the pressure vessel wall, at least one duct penetrating both metal sheet and the concrete portion, a shutter tube lining the duct and heat break means insulating the interior of the duct from the shutter tube, with a metal plate closing the end of the duct, spaced axially inwardly from the closure member.
Claim 5
Dependent Claim
61 words
A prestressed concrete pressure vessel for a nuclear reactor core as claimed in claim 1 in which the duct houses a pipe which is heat insulated from the shutter tube, the pipe and the shutter tube extending coextensively through the metal sheet and terminating in said metal plate, fluid carrying tubes extending in sealed engagement through holes in the metal plate.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |