US4282064A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nuclear fuel element
Assignee: Doryokuro Kakunenryo Kaihatsu Jigyodan
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Filing: 1979-05-25
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Granted: 1981-08-04
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Expires: 1999-05-25
Abstract
Abstract A nuclear fuel element is provided which comprises a cladding tube having end plugs for sealing ends of the cladding tube and a multiplicity of fuel pellets stacked within the cladding tube. Each of the fuel pellets has a substantially cylindrical external lateral surface and a plurality of longitudinal recesses having rounded root portions on the external lateral surface, and has a height within the range from 1/2 to 1/3 of the outer diameter thereof. These fuel pellets with the floral petal shape are stacked in such a manner that the recesses of one pellet are not aligned with the recesses of adjacent upper and/or lower pellets.
Inventors
- 👤 Kiyozumi Hayashi
- 👤 Kazushige Domoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:15
CPC Classifications
G; G21; G21C; G21C3/00; G21C3/02; G21C3/28; G21C3/04; G21C3/16; Y; Y02; Y02E; Y02E30/00; Y02E30/30; Y10; Y10S; Y10S376/00; Y10S376/90; Y10S376/901; Y10S376/903
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
98 words
A nuclear fuel element comprising: a cladding tube having end plugs for sealing the ends of said tube; and a multiplicity of fuel pellets stacked within the cladding tube; each of said fuel pellets having a substantially cylindrical external lateral surface and a plurality of longitudinal recesses having rounded root portions on the external lateral surface, a height of each pellet ranging from 1/2 to 1/3 of the outer diameter thereof, the fuel pellets being stacked in such a manner that the recesses of one pellet are not aligned with the recesses of adjacent upper and/or lower pellets.
Claim 2
Dependent Claim
98 words
A nuclear fuel element comprising: a cladding tube having end plugs for sealing the ends of said tube; and a multiplicity of fuel pellets stacked within the cladding tube; each of said fuel pellets having a substantially cylindrical external lateral surface and a plurality of longitudinal recesses having rounded root portions on the external lateral surface, a height of each pellet ranging from 1/2 to 1/3 of the outer diameter thereof, the fuel pellets being stacked in such a manner that the recesses of one pellet are not aligned with the recesses of adjacent upper and/or lower pellets.
Claim 3
Dependent Claim
30 words
The nuclear fuel element according to claim 1, wherein the fuel pellet has a through-hole which is in parallel with, and in eccentric to the central axis of the pellet.
Claim 4
Dependent Claim
32 words
The nuclear fuel element according to claim 2, wherein the fuel pellets are stacked such that the eccentric through-hole of one pellet is not aligned with the through-holes of other adjacent pellets.
Claim 5
Dependent Claim
16 words
The nuclear fuel element according to claim 1, wherein the fuel pellet has chamfered ridge portions.
Claim 6
Dependent Claim
24 words
The nuclear fuel element according to claim 1, wherein about ten to fifteen recesses are provided on the external lateral surface of the pellet.
References Cited (Backward Citations)
US3386887A
Cited
US3415911A
Cited
US3378454A
Cited
US3356584A
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US3580809A
Cited
US3560339A
Cited
US3801451A
Cited
US4175002A
Cited
US4129477A
Cited
US4131511A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-03 | 1985-02-02 | 1985-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-03 | 1989-02-02 | 1989-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-03 | 1993-02-02 | 1993-08-04 | $7700.00 | Window Closed / Lapsed |