1979-01-02
1981-09-29
Cangialosi, S. A.
176 86R, G21C 716
Patent
active
042921325
ABSTRACT:
A control rod suspended to reciprocate in a guide tube of a nuclear fuel assembly has a hydraulic bearing formed at its lower tip. The bearing includes a plurality of discrete pockets on its outer surface into which a flow of liquid is continuously provided. In one embodiment the flow is induced by the pressure head in a downward facing chamber at the end of the bearing. In another embodiment the flow originates outside the guide tube. In both embodiments the flow into the pockets produces pressure differences across the bearing which counteract forces tending to drive the rod against the guide tube wall. Thus contact of the rod against the guide tube is avoided.
REFERENCES:
patent: 3122045 (1964-02-01), Zilberfarb
patent: 3237150 (1966-02-01), Beck et al.
patent: 3562109 (1971-02-01), Bezold et al.
patent: 3640845 (1972-02-01), Ripley
patent: 3728218 (1973-04-01), Gnutzmann et al.
patent: 3855060 (1974-12-01), Dietrich et al.
patent: 3979258 (1976-09-01), Schweiger et al.
Horlacher, III Walter R.
Sampson William T.
Schukei Glen E.
Cangialosi S. A.
Combustion Engineering Inc.
Ristas L. James
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