05000325/LER-1981-033-03, /03L-0:on 810305,brushes on 1A Reactor Recirculation Pump Motor Generator Found Arcing.Caused by Oily Film on Exciter Collector Rings Which Allowed Accelerated Brush Wear.Rings Cleaned & Brushes Replaced

/03L-0:on 810305,brushes on 1A Reactor Recirculation Pump Motor Generator Found Arcing.Caused by Oily Film on Exciter Collector Rings Which Allowed Accelerated Brush Wear.Rings Cleaned & Brushes Replaced

ML19341D712
Person / Time
Site:	Brunswick
Issue date:	04/02/1981
From:	Pastva M CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19341D707	List: 05000325/LER-1981-033, Forwards LER 81-033/03L-0 05000325/LER-1981-033-03, /03L-0:on 810305,brushes on 1A Reactor Recirculation Pump Motor Generator Found Arcing.Caused by Oily Film on Exciter Collector Rings Which Allowed Accelerated Brush Wear.Rings Cleaned & Brushes Replaced
References
LER-81-033-03L, LER-81-33-3L, NUDOCS 8104080475
Download: ML19341D712 (2)

LER-1981-033, /03L-0:on 810305,brushes on 1A Reactor Recirculation Pump Motor Generator Found Arcing.Caused by Oily Film on Exciter Collector Rings Which Allowed Accelerated Brush Wear.Rings Cleaned & Brushes Replaced

Event date:
Report date:
3251981033R03 - NRC Website

text

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60 61 OOCKET NUM8ER 6d 69 EVENT DATE 14 iS REPORT OATE 80 EVENT OESCRIPTION AND PRO 8 ABLE CONSEQUENCES, h ITTTI I During normal plant operation, it was determined that the brushes on the lA reactor l

fTTTl I recirculation pump motor generator"v'ere arcing. While performing a load reduction g

[ TIT] j to remove this motor generator from service, it' tripped on a generator field ground.

l [TlT] l This event did not af fect the health or safety of the public.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i O lAn oily film on the MG set exciter collector rines allowedaccelerated wear of the MG l

y l set exciter brushes which caused arcing between the brushes and collector rf p vi e b i

lthe resultant field ground. The collector ' ring's Vere cleaned and resurfaced, the l

g l brushes replaced and the source of the oily film eUminated.

The MG set was then g j satisfactorily tested and returned to service.

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i LER A'lTACHMENT - RO #1-81-33 Facility: BSEP Unit No.1 Event Date: March 5,1981 The MG set generator field ground occurred as a result of abnormal degradation of the exciter brushes caused by an oil leak from a bearing seal in the MG motor.

Consultations with the MG set GE technical representative concluded that an oily film on the MG set collector rings surfaces caused by the oil leak provided the means of contacting the exciter brushes with oil and providing the generator field ground path.

3 The collector rings were cleaned to remove the oil film and the MG motor bearing seal was tightened to eliminate the source of the oil. The collector rings were then resurfaced to remove damaged incurred during the event and the excit,er brushes were replaced. The MG set was then checked for proper operation and returned to service. A revision has been made to the maintenance instructions to replace the MG set exciter brushes on both units using a more conservative GE recommended determination for brush wear requiring replacement.

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