05000317/LER-1981-013-03, Bearing Found Scored & Babbit Matl Found in Oil When Investigating Cause for Dirty Oil in Auxiliary Feedwater Pump 11 Inboard Turbine Bearing. Probably Caused by Improper Oil Level or Contaminated Oil

Bearing Found Scored & Babbit Matl Found in Oil When Investigating Cause for Dirty Oil in Auxiliary Feedwater Pump 11 Inboard Turbine Bearing. Probably Caused by Improper Oil Level or Contaminated Oil

ML20009D930
Person / Time
Site:	Calvert Cliffs
Issue date:	07/10/1981
From:	Davis S, Lheureux W BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20009D914	List:
References
LER-81-013-03X, LER-81-13-3X, NUDOCS 8107240509
Download: ML20009D930 (2)

LER-1981-013, Bearing Found Scored & Babbit Matl Found in Oil When Investigating Cause for Dirty Oil in Auxiliary Feedwater Pump 11 Inboard Turbine Bearing. Probably Caused by Improper Oil Level or Contaminated Oil

Event date:
Report date:
3171981013R03 - NRC Website

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NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT US RT DATE 03-17-81 CONTROL bLor. - l l

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7 8 9 LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE Jo 51 CAT 68 CON'T Z I L l@l 01 51 01 0101 31 Il 71@l 0121 1171 81 Il@l 017 l 1101 81 i l@

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8 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 10121 l At 0400 while investigating the cause for dirty oil in #11 AFW Pumn in-

_J O 3 I board turbine bearing, it was discovered that the bearing journal was l

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damaged (T.S. 3.7.1.2).

The bearing was repaired and the pump was re-l lO isi I turned to service at 2005, on 2-19-81.

1. 12 AFW Pump and normal Feed-1 F5T61 I water remained operable during the event. LER's 80-71 and 81-17 (U-1) l 10 l 71 l -

describe similar events.

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33 34 3b 36 31 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i O l The bearing was scored, and babbit material was found susoended in the I

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oil. Th's damage could be causet. by imnrocer oil level or contaminated I

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oil. Markings have been added to the sightalasses to maintain proner J

, 3 l-oil level and the Preventive Maintenance ProOram has been modified to

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increase the oil change interval.

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% POWER OTHER STATUS IS OV RY DISCOVERY DESCRIPTION [E_j@ l 11010 l@l NA l

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8 9 10 NAME OF PREPARER PHONE:

M LER NO.

81-13/3X Rev. I DOCKET NO.

50-317 LICENSE NO.

O PR-53 EVENT DATE 02-17-81 REPORT DATE 07-10-81 ATTACHMENT EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (CONT'D)

At 0400 while investigating the cause for dirty oil in the inboard turbine bearing on #11 AFW Pump, the mechanic discovered that the bearing journal had become worn to the point where replacement was required (T.S. 3.7.1.?). #11 AFW Pump was repaired and returned to service af ter successfully completing a post mainten nce operational test at 2005 on 02-19-81. #12 AFW Pump, which recently had its inboard turbine bearing replaced in January 1981, rernained operable.

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (CONT'D)

The bearing was scored, and babbit material was found suspended in the oil. T! as osmage could be caused by improper oil level or contaminated oil. Markings nave

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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 been installed on the turbine casing near the bearings to prevent excessive heat transfer to the bearing surface.