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US3787286A Expired / Lapsed US ⏱️ 0.0 years remaining

Fuel assembly flow redistribution

Assignee: Combustion Engineering Inc
•
Filing: 1971-12-17
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Granted: 1974-01-22
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Expires: 1991-12-17
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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 08:00
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)

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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) 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

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