Bottom mounted fuel holddown

Details Bottom mounted fuel holddown Bottom mounted fuel holddown

G - Physics

21

C

359/76

G21C 3/04 (2006.01) G21C 5/06 (2006.01)

Patent

CA 1145072

Abstract of the Disclosure A nuclear reactor fuel assembly having a lower end fitting and an actuating member interacting therewith for holding the assembly down on the nuclear reactor core support stand in the presence of an upward flow of coolant. The lower end fitting has locking structure responsive to the movement of the actuating member for selectively interacting with projections on the support stand. The actuating member comprises a rod disposed along the vertical axis of the fuel assembly and extending into the lower end fitting, where laterally extending actuating arms are attached to the rod. The lower end fitting has four alignment posts located adjacent to the pro- jections in the support stand. Two of the posts are fitted with locking springs which are adapted to engage shoulders on the projections. The other posts are fitted with bracing springs that do not engage the projections. To lock the assembly into place, the rod is forced downward whereby the arms contact the surfaces of the springs. The locking springs, having a low spring constant, are forced outward into engagement with the adjacent shoulder on the stand projection. The bracing springs, having a high spring constant, produce horizontal movement of the posts into firm contact against the adjacent projection. The combined effect is that one set of springs provides positive locking holddown and the other set provides lateral bracing against vibration.

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