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US4522781A
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Integral nuclear fuel element assembly
Assignee: BWX Technologies Inc
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Filing: 1981-12-04
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Granted: 1985-06-11
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Expires: 2001-12-04
Abstract
Abstract An integral nuclear fuel element assembly utilizes longitudinally finned fuel pins. The continuous or interrupted fins of the fuel pins are brazed to fins of juxtaposed fuel pins or directly to the juxtaposed fuel pins or both. The integrally brazed fuel assembly is designed to satisfy the thermal and hydraulic requirements of a fuel assembly lattice having moderator to fuel atom ratios required to achieve high conversion and breeding ratios.
Inventors
- 👤 Donald C. Schluderberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:23
CPC Classifications
G; G21; G21C; G21C3/00; G21C3/30; G21C3/32; G21C3/336; G21C3/02; G21C3/28; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
132 words
In a pressurized water moderated and cooled fast breeder nuclear reactor, a fuel assembly comprising a nuclear fuel and a plurality of fuel pins disposed with parallel longitudinal axes in a closely packed array, each fuel pin consisting essentially of a generally tubular cladding bearing said nuclear fuel and a longitudinally extending fin extending from said cladding to each juxtaposed fuel pin and bonded metallurgically thereto to form an integral fuel assembly having coolant passages which are defined by said cladding surface and said fins and which are unobstructed by spacer grids, and said fuel pins including said fins are sized such that the fuel assembly has a structural volume fraction less than about 0.166 and a fuel to coolant volume fraction ratio in the range between about 2.43 and about 3.20.
Claim 2
Dependent Claim
132 words
In a pressurized water moderated and cooled fast breeder nuclear reactor, a fuel assembly comprising a nuclear fuel and a plurality of fuel pins disposed with parallel longitudinal axes in a closely packed array, each fuel pin consisting essentially of a generally tubular cladding bearing said nuclear fuel and a longitudinally extending fin extending from said cladding to each juxtaposed fuel pin and bonded metallurgically thereto to form an integral fuel assembly having coolant passages which are defined by said cladding surface and said fins and which are unobstructed by spacer grids, and said fuel pins including said fins are sized such that the fuel assembly has a structural volume fraction less than about 0.166 and a fuel to coolant volume fraction ratio in the range between about 2.43 and about 3.20.
Claim 3
Dependent Claim
103 words
In a water moderated and cooled fast breeder nuclear reactor, a fuel assembly comprising a nuclear fuel and a metallic block, said block having a plurality of first and second transversely spaced parallel channels, said first channels containing said nuclear fuel and said second channels defining means for flow of moderator coolant through said block, said first channels and said second channels being further disposed such that neutrons can pass between first channels without entering one of the second channels, and said first and second channels are sized to provide a moderator to fuel atom ratio which is not greater than about 0.44.
Claim 4
Dependent Claim
103 words
In a water moderated and cooled fast breeder nuclear reactor, a fuel assembly comprising a nuclear fuel and a metallic block, said block having a plurality of first and second transversely spaced parallel channels, said first channels containing said nuclear fuel and said second channels defining means for flow of moderator coolant through said block, said first channels and said second channels being further disposed such that neutrons can pass between first channels without entering one of the second channels, and said first and second channels are sized to provide a moderator to fuel atom ratio which is not greater than about 0.44.
Claim 5
Dependent Claim
16 words
A fuel assembly according to claim 2 wherein said block is formed from an aluminum alloy.
Claim 6
Dependent Claim
24 words
A fuel assembly according to claim 1 wherein said fin is metallurgically bonded to a juxtaposed fuel pin by means of a brazed connection.
Claim 7
Dependent Claim
39 words
A fuel assembly according to any one of claims 1 or 4 wherein said fin extends continuously without interruption along the surface of said cladding in a direction generally parallel with the longitudinal axis of said respective fuel pin.
Claim 8
Dependent Claim
25 words
A fuel assembly according to any one of claims 1 or 4 wherein said nuclear fuel is plutonium and the pressurized water is heavy water.
Claim 9
Dependent Claim
19 words
A fuel assembly according to any one of claims 2 or 3 wherein the pressurized water is heavy water.
Claim 10
Dependent Claim
24 words
A fuel assembly according to any one of claims 2 or 3 wherein the moderator to fuel atom ratio ranges from 0.43 to 0.44.
Claim 11
Dependent Claim
27 words
A fuel assembly according to any one of claims 2 or 3 further having a structure volume fraction which is in the range of 0.405 to 0.421.
References Cited (Backward Citations)
US2902422A
Cited
US3278388A
Cited
DE1464962A1
Cited
DE1464986A1
Cited
US3674638A
Cited
US3859165A
Cited
US4060454A
Cited
US4324618A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |