05000317/LER-1981-013-03, /03L-0:on 810217,inboard Turbine Bearing Journal in Auxiliary Feedwater Pump 11 Was Found Heavily Heat Scored & Babbit Matl Was Suspended in Oil.Probably Caused by Improper Oil Level or Contaminated Oil.Procedures Changed

/03L-0:on 810217,inboard Turbine Bearing Journal in Auxiliary Feedwater Pump 11 Was Found Heavily Heat Scored & Babbit Matl Was Suspended in Oil.Probably Caused by Improper Oil Level or Contaminated Oil.Procedures Changed

ML19347D639
Person / Time
Site:	Calvert Cliffs
Issue date:	03/17/1981
From:	Davis S, Pence W BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19347D637	List: 05000317/LER-1981-013, Forwards LER 81-013/03L-0 05000317/LER-1981-013-03, /03L-0:on 810217,inboard Turbine Bearing Journal in Auxiliary Feedwater Pump 11 Was Found Heavily Heat Scored & Babbit Matl Was Suspended in Oil.Probably Caused by Improper Oil Level or Contaminated Oil.Procedures Changed
References
LER-81-013-03L, LER-81-13-3L, NUDOCS 8103260934
Download: ML19347D639 (2)

LER-1981-013, /03L-0:on 810217,inboard Turbine Bearing Journal in Auxiliary Feedwater Pump 11 Was Found Heavily Heat Scored & Babbit Matl Was Suspended in Oil.Probably Caused by Improper Oil Level or Contaminated Oil.Procedures Changed

Event date:
Report date:
3171981013R03 - NRC Website

text

U. S. NUCLEAH MtGULATOHY CCP.W1MlUFO 4 NRC FORM 366 87 711 ^

LICENSEE EVENT REPORT

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'S ME80RT O ATE 50 sveNT cas:RipTicN Ano Pros Asts ccNsacuEscss @

jio i:! I At 0400 while investigating the cause for dirty oil in #11 APA cuma in-

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board turbine bearing, it was discovered that the bearing fournal was

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damaged (T.S. 3.7.1.2).

The bearing was recaired and the cumo was re-

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turned to service at 2005 en 02-19-81.

1. 12 AF.I outo and normal feed-1

, i a 13 i :

water remained operable during tne event. This event did not affect I

.tC;7!l the health or safety of the cublic. LER 50-318/81-09 and 80-71 de-i scribe similar events.

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CAUSE

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J3 04 35 36 33 40 41 42 43 44 47 cAuss ces RipT:CN AND CCARECTIVE ACTICNS h Iiiali The bearina was heavilv Fe** scored and babbit material was found sus-I to the bearine could be caused 5v im-I 4

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g i, i ci 1 orocer oil level or contaminated oil. Chances are beina made to oro-I

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ina the oil system.

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50-317 LICENSE NO.

DPR-53 EVENT DATE 02-17-31 REPORT DATE 03-17-31 ATTACHMENT EVENT DESCRIPTION AND PROBABLE CONSEOUENCES (CONT'D)

At 0400 while investigating the cause for dirty oil in the inboard turbine bearing on illi AFW pump, the mechanic discovered that the bearing journal had become worn to the point where replacement was required (T.S.

3.7.1.2). #11 AFW pump was repaired and returned to service af ter successfully completing a post maintenance operatonal test at 2005 on 02-19-81. #12 AFW pump which recently had its inboard turbine bearing replaced in January 1931 remained operable during the event. In addition, the manual feed system remained operable. The event did not affect the health or safety of the public. LER 30-71 describes similar events.

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (CON'D)

~The bearing was heavily heat scored and babbit material was found suspended in the oil. The damage to the bearing could be caused by improper oillevel or contaminated oil. Changes are being made to the sightglasses to add clear markings for maintaining the oil within the required control band and the preventive maintenance program is being modified to increase oil change from every refueling outage to once a month.