US3801448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removable top shield for a nuclear reactor core
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
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Filing: 1972-11-21
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Granted: 1974-04-02
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Expires: 1992-11-21
Abstract
Abstract The removable top shield comprises two rotating shield plugs mounted in eccentric relation for closing the top portion of the reactor vessel and is made up of metallic shielding flasks containing shielding elements and mounted on a frame so as to constitute a cluster unit. The cluster units are supported on flooring elements which are attached respectively to the large shield plug and the small shield plug of the reactor by means of a metallic structure and the flooring being carried on the lateral shields of the reactor core.
Inventors
- 👤 R Brandstetter
- 👤 M Robin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:51
CPC Classifications
G; G21; G21C; G21C11/00; G21C11/02; G21C11/022; G21C1/00; G21C1/02; G21C1/03; G21C13/00; G21C13/02; G21C13/06; G21C13/073; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
125 words
A removable top shield of the core of a sodium-cooled nuclear reactor of the integrated type and comprising two rotating shield plugs mounted in eccentric relation for closing the top portion of the reactor vessel, wherein said shield is constituted by metallic cylindrical flasks which contain the shielding elements, said flasks being assembled on a frame provided with a grappling hook at the top portion thereof, said assembly of flasks being so arranged as to constitute a cluster unit, the cluster units being in turn supported on flooring elements which are attached respectively to the large shield plug and small shield plug of the reactor by means of a metallic structural framework, said flooring elements being applied against the lateral shields of the reactor core.
Claim 2
Dependent Claim
125 words
A removable top shield of the core of a sodium-cooled nuclear reactor of the integrated type and comprising two rotating shield plugs mounted in eccentric relation for closing the top portion of the reactor vessel, wherein said shield is constituted by metallic cylindrical flasks which contain the shielding elements, said flasks being assembled on a frame provided with a grappling hook at the top portion thereof, said assembly of flasks being so arranged as to constitute a cluster unit, the cluster units being in turn supported on flooring elements which are attached respectively to the large shield plug and small shield plug of the reactor by means of a metallic structural framework, said flooring elements being applied against the lateral shields of the reactor core.
Claim 3
Dependent Claim
105 words
A top shield according to claim 1, wherein the metallic flasks each have the shape of a cylinder having a domical lower end and closed at the top end by an end-cap which is screwed onto said cylinder, the domical portion of the cylinder being provided at the base thereof with a cone-shaped bore which is widened-out in the downward direction, the end-cap of each flask being provided at the summit thereof with two vertical lugs each pierced by a bore for the insertion of a locking-pin, the interior of said flasks being filled with materials which constitute the top shield of the reactor core.
Claim 4
Dependent Claim
74 words
A top shield according to claim 1, wherein each cluster unit is constituted by an I-shaped frame on which are fixed cross-members on the top arms and on the bottom arms of the I, each flask being secured to the top cross-member by means of a locking-pin and to the corresponding bottom cross-member by means of a centering cone, each cluster unit aforesaid being provided with a grappling hook at the top portion thereof.
Claim 5
Dependent Claim
22 words
A top shield according to claim 1, wherein the materials contained within each shielding flask are graphite, stainless steel and boron carbide.
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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |