Guide thimble captured locking tube in a reconstitutable fuel assembly

Douille de verrouillage retenue par le tube de guidage dans un assemblage combustible reconstituable

Im Führungsrohr gehaltene Verriegelungshülse eines wiederzusammenbaubaren Brennstabbündels

Abstract

The invention relates generally to a reconstitutable nuclear fuel assembly and, more particularly, to improved means for maintaining releasable locking engagement between upper guide-thimble extensions and sockets in the adapter plate of the top nozzle of the fuel assembly. The improved means associated with each guide thimble comprises a locking tube (48) with a radial protuberance (80) on a lower portion thereof, and two circumferential bulges (76, 78) formed on the guide-thimble extension (44) and cooperable with the protuberance (80) on the locking tube to retain the latter in either a locking position for preventing release of the guide-thimble extension from the associated socket (50) in the adapter plate (40), or an unlocking position permitting release of the guide-thimble extension from the socket. As distinct from previous arrangements providing for withdrawal of the locking tubes from the guide-thimble extensions, the present arrangement provides for the locking tubes to be pushed farther into, and retained in, the associated guide-thimble extensions during removal of the top nozzle.

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Patent Citations (5)

    Publication numberPublication dateAssigneeTitle
    EP-0041014-A1December 02, 1981COMMISSARIAT A L'ENERGIE ATOMIQUE Etablissement de Caractère Scientifique Technique et IndustrielBefestigungsanordnung für ein Führungsrohr eines Brennelementenbündels auf die Endplatten dieses Bündels
    EP-0098774-A1January 18, 1984Commissariat A L'energie AtomiqueDemontierbare Einrichtung zur Fixierung eines Führungsrohres in der Endplatte eines Kernreaktorbrennelementbündels
    EP-0140588-A1May 08, 1985Westinghouse Electric CorporationNuclear reactor fuel assembly with a removable top nozzle
    FR-2493024-A1April 30, 1982Franco Belge CombustiblesConnector for fuel rod assemblies in nuclear reactor - where clamping ring is used to locate ends of control rod guide tubes in holes in plate
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Cited By (5)

    Publication numberPublication dateAssigneeTitle
    EP-0289732-A2November 09, 1988Westinghouse Electric CorporationAssemblage de combustible nucléaire reconstituable
    EP-0289732-A3August 23, 1989Westinghouse Electric CorporationReconstitutable nuclear fuel assembly
    EP-0360658-A1March 28, 1990Framatome, CogemaFuel assembly capable of being disassembled for a light water-cooled nuclear reactor
    FR-2636768-A1March 23, 1990Framatome Sa, CogemaAssemblage combustible demontable pour un reacteur nucleaire refroidi par de l'eau legere
    US-4999154-AMarch 12, 1991Framatome, CogemaDemountable fuel assembly for a nuclear reactor cooled by light water