Induced nuclear reactions: processes – systems – and elements – Reactor structures – Circulating fluid within reactor
Patent
1994-12-21
1996-02-06
Wasil, Daniel D.
Induced nuclear reactions: processes, systems, and elements
Reactor structures
Circulating fluid within reactor
411109, 411263, 411307, G21C 506
Patent
active
054901901
ABSTRACT:
Self-locking alignment pin and method for aligning a nuclear fuel assembly with respect to a core plate disposed in a nuclear reactor pressure vessel. The fuel assembly has a top nozzle having a first bore formed therein. The core plate has a second bore alignable with the first bore. The second bore has first threads of a first predetermined pitch and second threads of a second predetermined pitch. The alignment pin further includes a shaft that has an end portion having third threads of the first predetermined pitch for threadably engaging the first threads of the second bore. A flange, which has a plurality of recesses in the underside surface thereof, surrounds the shaft and is integrally attached thereto. A locking member surrounds the flange and has exterior fourth threads of the predetermined second pitch for threadably engaging the second threads of the second bore. The locking member also has deformable portions adapted to engage respective ones of the recesses for locking the locking member to the flange. The flange and the shaft are prevented from disengaging the bore in the core plate because the first and third threads have a pitch different than the pitch of the second and fourth threads.
REFERENCES:
patent: 4690600 (1987-09-01), Lauer
patent: 4820479 (1989-04-01), Hornak et al.
patent: 5030413 (1991-07-01), Knierriem et al.
patent: 5164154 (1992-11-01), Brown et al.
patent: 5297176 (1994-03-01), Altman et al.
Hopkins Ronald J.
Land John T.
Stevens Walter S.
Wasil Daniel D.
Westinghouse Electric Corporation
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