Fuel rod for a nuclear plant and a plenum spring arranged to...

Details Fuel rod for a nuclear plant and a plenum spring arranged to... Fuel rod for a nuclear plant and a plenum spring arranged to...

2006-03-07

2006-03-07

Keith, Jack (Department: 3663)

Induced nuclear reactions: processes, systems, and elements

Fuel component structure

Encased with nonfuel component

C376S413000, C376S420000

Reexamination Certificate

active

07010078

ABSTRACT:
The present invention relates to a fuel rod for a nuclear plant and a plenum spring arranged to be provided in a fuel rod. The fuel rod (1) comprises a cladding tube (2) sealed at its ends by end plugs (3, 4), a plurality of fuel pellets (5) stacked on each other inside the cladding tube (2) such that they form a column of pellets and said plenum spring (6) arranged to hold with a spring force the column of pellets against the lower second end of the cladding tube (2) during operation. The plenum spring (6) comprises a first length variable part (8) which abuts the uppermost located fuel pellet (5) in the column of pellets with an end portion (9), a second part (10) which allows engagement of the plenum spring (6) against an inner surface of the cladding tube (2) by a radially outwardly directed pressure and a third part (11) which allows releasing of the second part (10) of the plenum spring (6) in the cladding tube (2) during operation of the nuclear plant.

REFERENCES:
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patent: 4011134 (1977-03-01), Stehle et al.
patent: 4871509 (1989-10-01), Johansson
patent: 5317612 (1994-05-01), Bryan et al.
patent: 5329566 (1994-07-01), King
patent: 0340563 (1989-11-01), None
patent: 0361037 (1990-04-01), None
patent: 10020061 (1998-01-01), None

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