Patent US3787286A successfully refreshed from Google Patents.
US3787286A
Expired / Lapsed
US
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Fuel assembly flow redistribution
Assignee: Combustion Engineering Inc
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Filing: 1971-12-17
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Granted: 1974-01-22
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Expires: 1991-12-17
Abstract
Abstract Flow deflector apparatus is provided in fuel assemblies of a nuclear reactor to effect mixing of the coolant flowing in channels between adjacent members thereof. The apparatus comprises metal strips containing pre-punched tab projections that are attached to at least some of the members that comprise the fuel assemblies.
Inventors
- 👤 A Anthony
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:49
CPC Classifications
G; G21; G21C; G21C3/00; G21C3/30; G21C3/32; G21C3/34; G21C3/356; G21C3/3563; G21C3/322; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
182 words
A fuel assembly for a nuclear reactor comprising: a. a plurality of elongated, parallel members, some of which are fuel elements and others of which are non-fuel bearing members; b. at least one transversely extending support grid including a plurality of intersecting plates forming enclosures about the respective members and disposing the same in mutually laterally spaced relation to define interstitial flow channels for conducting a fluid coolant in heat exchange relation with said fuel elements; and c. means for laterally deflecting at least a portion of the coolant flowing through said flow channels, said means each comprising: i. a thin body of strip metal having a surface attached to the external surface of one of said members, ii. said body extending substantially parallel to the axis of said member and containing a plurality of longitudinally spaced tab projections struck out from said body, said tab projections being cantilever supported upon said body and extending obliquely outwardly into the adjacent flow channel with the free ends of said tab projections extending in the direction of coolant flow through said adjacent flow channel.
Claim 2
Dependent Claim
182 words
A fuel assembly for a nuclear reactor comprising: a. a plurality of elongated, parallel members, some of which are fuel elements and others of which are non-fuel bearing members; b. at least one transversely extending support grid including a plurality of intersecting plates forming enclosures about the respective members and disposing the same in mutually laterally spaced relation to define interstitial flow channels for conducting a fluid coolant in heat exchange relation with said fuel elements; and c. means for laterally deflecting at least a portion of the coolant flowing through said flow channels, said means each comprising: i. a thin body of strip metal having a surface attached to the external surface of one of said members, ii. said body extending substantially parallel to the axis of said member and containing a plurality of longitudinally spaced tab projections struck out from said body, said tab projections being cantilever supported upon said body and extending obliquely outwardly into the adjacent flow channel with the free ends of said tab projections extending in the direction of coolant flow through said adjacent flow channel.
Claim 3
Dependent Claim
20 words
Apparatus according to claim 1 wherein said coolant deflecting means are attached only to non-fuel bearing members in said assembly.
Claim 4
Dependent Claim
33 words
Apparatus according to claim 1 wherein said coolant deflecting means includes a plurality of strip metal bodies attached to the external surfaces of said selected members and are disposed on circumferential spacing thereabout.
Claim 5
Dependent Claim
19 words
Apparatus according to claim 1 wherein all of said tab projections are disposed externally of said support grid enclosures.
Claim 6
Dependent Claim
22 words
Apparatus according to claim 1 wherein said tab projections are twisted to impart rotational motion to the coolant flowing through said channel.
References Cited (Backward Citations)
US3260652A
Cited
US3030293A
Cited
US2990359A
Cited
US3179570A
Cited
US3216904A
Cited
US3070537A
Cited
US3105037A
Cited
US3356587A
Cited
US3308034A
Cited
US3423287A
Cited
US3481832A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |