05000317/LER-1981-017-03, Inboard Bearing Found Scored When Auxiliary Feedwater Pump 12 Taken Out of Svc for Insp.Apparently Caused by Improper Oil Level or Contaminated Oil.Markings Added to Sightglasses & Maint Program Modified

Inboard Bearing Found Scored When Auxiliary Feedwater Pump 12 Taken Out of Svc for Insp.Apparently Caused by Improper Oil Level or Contaminated Oil.Markings Added to Sightglasses & Maint Program Modified

ML20009D807
Person / Time
Site:	Calvert Cliffs
Issue date:	07/10/1981
From:	Davis S, Lheureux R BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20009D803	List: 05000317/LER-1981-017, Forwards Updated LER 81-017/03X-1 05000317/LER-1981-017-03, Inboard Bearing Found Scored When Auxiliary Feedwater Pump 12 Taken Out of Svc for Insp.Apparently Caused by Improper Oil Level or Contaminated Oil.Markings Added to Sightglasses & Maint Program Modified
References
LER-81-017-03X, LER-81-17-3X, NUDOCS 8107240367
Download: ML20009D807 (2)

LER-1981-017, Inboard Bearing Found Scored When Auxiliary Feedwater Pump 12 Taken Out of Svc for Insp.Apparently Caused by Improper Oil Level or Contaminated Oil.Markings Added to Sightglasses & Maint Program Modified

Event date:
Report date:
3171981017R03 - NRC Website

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NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION (7 77)

UPDATE REPORT LICENSEE EVENT REPORT PREVIOUS REPORT DATE 04-01-81 CONTROL BLOCK: l l

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60 61 DOCKET NUMBErt 68 69 EVENT OATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 l At 0630 during normal operation, #12 AFW Pump was placed out of service I

l o 13 i'l per T.S. 3.7.1.2 to inspect turbine bearings. The inboard bearing re-1 i o i41 I quired replacement. At 0630 on 3-17-81, #12 AFW Pump had not been re-l 1o1sl l turned to service as required and reactor shutdown started. #12 AFW I

lo is l I Pump was te turned to service at 0952 on 3-17-81, and the reactor return-l l0 l7l l ed to 100% power.

1. 11 AFW Pump remained operable. LER's 80-71 and 81-13 l

l o Ia 1-l (U-1) describe similar events.

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- li lo j l The bearina was scored. This damaae could be caused by improper oil I

ITri l '1 level or contaminated oil. Markinos have been added to the sichtglasses I

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I to maintain proper oil level and the Preventive Maintenance Program has I

j FFTTI I been modified to increase the oil change interval.

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8 9 to S. M. Davis /R. W. L'Heureux PHONE: (301) 269-4850/4869 o

NAME OF PREPARER 3

f, LER NO. -

81-17/3X Rev.1 DOCKET NO.

50-317 LICENSE NO.

DPR-53 EVENT DATE -

03-04-81 REPORT DATE 07-10-81 ATTACHMENT CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (CONT'D)

The bearing was scored. This damage could be caused by improper oil level or

- contaminated oil. Markings have been added to the sightglasses to maintain proper oil level and the Preventive Maintenance Program has been modified to increase the oil change interval. Insulation has also bee. installed on the turbine casing near the bearings to prevent excessive heat transter to the bearing surfaces.