Core internals of a water-cooled nuclear reactor

Details Core internals of a water-cooled nuclear reactor Core internals of a water-cooled nuclear reactor

1989-11-27

1991-07-09

Bentley, Stephen C.

Induced nuclear reactions: processes, systems, and elements

Reactor structures

Circulating fluid within reactor

403277, 403284, G21C 506

Patent

active

050304135

ABSTRACT:
Upper and lower core structures of core internals carry a plurality of centering pins which have free ends protruding into recesses in a fuel assembly endpiece. In the case of the upper core structure in particular, the nuts for fixing the centering pins are difficult to access in the event of a subsequent exchange of pins. Therefore, core internals which do not require a nut for securing on the centering pins are preferred. For this purpose, a centering pin is provided with a center bore passing through it. The ends of the center bores facing away from the fuel assemblies are in the form of conically tapering stepped bores. Each stepped bore has a plug which is displaceable in axial direction relative to the centering pin. The peripheral surface of the plug is conically formed in the same direction and with the same pitch as the stepped bore. The centering pin enters into a play-free fitting connection with a bore in a grid plate. The peripheral surface of the centering pin is provided with a grooving at the level of the stepped bore, which enters into a form-locking connection with the wall of the bore in the grip plate, after relative movement of the plug and the centering pin has taken place.

REFERENCES:
patent: 4820479 (1989-04-01), Hornak et al.

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