Induced nuclear reactions: processes – systems – and elements – Fuel component structure – Plural fuel segments or elements
Patent
1984-08-27
1986-11-04
Walsh, Donald P.
Induced nuclear reactions: processes, systems, and elements
Fuel component structure
Plural fuel segments or elements
376448, 376449, 376451, G21C 332
Patent
active
046209603
ABSTRACT:
A top nozzle of a nuclear reactor fuel assembly is removably mounted to the guide thimbles of the fuel assembly by mating and unmating of pluralities of outer and inner sockets defined in the respective top nozzle and guide thimbles. A bearing plate supported on the top nozzle and movable relative thereto between a lower, non-release position and an upper, release position supports a plurality of locking tubes which are inserted at their lower end portions into the outer sockets. When the bearing plate is at its non-release position, the lower end portions of the locking tubes are inserted into the inner sockets and prevent them from unmating from the outer sockets and thereby retain the top nozzle mounted to the guide thimbles. However, when the bearing plate is at its release position, the locking tube lower end portions are withdrawn from the inner sockets and allow them to unmate from the outer sockets and thereby allow lifting of the top nozzle off and removal from the guide thimbles. During normal operation, the bearing plate is retained at its lower, non-release position by a set of lower removable stops, but upon their removal the plate can move to its upper release position against an upper set of fixed stops. At such position of the plate, the top nozzle can be removed from the guide thimbles.
REFERENCES:
patent: 3235463 (1966-02-01), Sankovich
patent: 3828868 (1974-08-01), Jabsen
patent: 4265010 (1981-05-01), Doss
Gjertsen Robert K.
Shallenberger John M.
Wilson John F.
Walsh Donald P.
Westinghouse Electric Corp.
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