A METHOD OF REPAIRING A REACTOR COOLANT PUMP SHAFT AND A REACTOR COOLANT PUMP REPAIRED BY SUCH METHOD

Title:

A METHOD OF REPAIRING A REACTOR COOLANT PUMP SHAFT AND A REACTOR COOLANT PUMP REPAIRED BY SUCH METHOD

Document Type and Number:

WIPO Patent Application WO2001094069

Kind Code:

A3

Abstract:

Cracks in the shaft (7) of a reactor coolant pump adjacent a tapered end (7t) on which the impeller is mounted are removed by a machining a circumferential groove (41) in the pump shaft to a depth and an axial length which removes the cracks but does not extend into the tapered end of the pump shaft. A split ring (45) fills the groove (41) to an outer diameter which matches the outer diameter of the pump shaft. A thermal sleeve (47) shrink fit over the split ring has internal annular ribs engaging (53,55) the shaft and the ring to form an annulus which communicates with the pump chamber (5) sufficiently to maintain a layer of substantially stagnant coolant over the split ring and the pump shaft at the pressure of the coolant being pumped. An oversized washer (65) between the impeller and the impeller retainer nut overlaps the interface between the impeller and the tapered end of the pump shaft to impede the flow of hot reactor coolant along the keyways in the tapered end of the shaft and the impeller to minimize temperature fluctuations in the vicinity of the thermal sleeve. Preferably, the thermal sleeve has a lower coefficient of thermal expansion than those of the shaft and the split ring.

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Inventors:

VERONESI LUCIANO
DRAKE JAMES A

Application Number:

PCT/US2001/018347

Publication Date:

June 13, 2002

Filing Date:

June 06, 2001

Export Citation:

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Assignee:

WESTINGHOUSE ELECTRIC CORP (US)

International Classes:

B23P6/00; F04D7/08; F04D29/04; F04D29/043; G21C15/243; (IPC1-7): B23P6/00; G21C17/00; G21C15/25; F04D29/58; F04D29/04; G21C15/243

Foreign References:

US5215243A	1993-06-01
US5228836A	1993-07-20
US5333991A	1994-08-02

Other References:

PATENT ABSTRACTS OF JAPAN vol. 2000, no. 04 31 August 2000 (2000-08-31)
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 05 30 April 1998 (1998-04-30)

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