ML19262C460

LER 80-014/03L-0:on 800113,during Insp of Auxiliary Feedwater Pump 1-FW-P-2 Outboard Bearing,Discovered Inboard Side of Thrust Bearing Had Been Wiped.Caused by Lack of Oil. Bearing Replaced & Pump Returned to Svc

ML19262C460
Person / Time
Site:	North Anna
Issue date:	02/11/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19262C459	List: ML19262C458 ML19262C460
References
LER-80-014-03L, LER-80-14-3L, NUDOCS 8002130502
Download: ML19262C460 (2)

Text

NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION (777)

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DATE 1 d 60 61 DOCK E T NUMB E R ed 63 EVENT DATE I4 15 EVEN T DESCRIPTION AND PROB ABLE CONSEQUENCES h o!2 i On January 13, 1980, w ith the uni t in Mode 3, s team driven auxiliarv feedwater nu m o 3 l l-FW-P-2 was removed from service to insnect the outboard hearing of the numn. Upon l o 4 l removal of the hearing, it was observed that the inboard side of the thrust bearino l o 5 l had Men wined. Because both motor driven auxiliarv feedwater numns remained avail- l 0 6 l able for operation if recuired, the health and safety of the oeneral nublic were not 1 0l7 l affected. Renortable nursuant to T.S. 6.9.1.9.b. I O H  !

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Virginia Electric and Powe r Company North Anna Power Station, Unit #1

Attachment:

Page 1 of 1 Doc ke t No. 50-338 Report No. LER 80-014/03L-0 Description of Event On January 13, 1980, with the unit in hot standby, the steam driven auxiliary feedwater pump 1-FW-P-2 was removed from service due to a reported oil leak for inspection of the pump's outboard bearing. When the bearing was removed , the inboard side of the thrust bearing was found to be wiped.

Probable Consequences of Occurrence The consequences at this event were limited because both motor driven auxiliary feedwater pumps (1-FW-P-3A and 3B) remained available for operation if required. The ef fects of this occurrence were also minimized by the fact that the inoperable auxiliary feedwater pump was restored to operable status within the 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> time limit allowed by the Action Statement of T.S. 3. 7.1. 2. As a re sul t , the health and safety of the general public were not af fected by this event. There are no generic implications associa-ted with this particular occurrence.

Cause of Event It is believed that the wiped thrust bearing resulted from a lack of oil in the bearing. Because the auxiliary feedwater pump had not operated since the start of the refueling outare, the oil had an opportunity to drain out of the bearing during this extended period.

Immediate Corrective Action The wiped thrust bearing was replaced and the auxiliary feedwater pump was returned to service.

Scheduled Corrective Action No scheduled corrective action is required.

Actions Taken to Prevent Recurrence No further actions are required.