ML19209B701

LER 79-108/03L-0:on 790904,motor-driven Auxiliary Feedwater Pump 1-FW-P-3A Inoperable.Caused by Removal of Strainer for Maint.Strainer Was Reinstalled

ML19209B701
Person / Time
Site:	North Anna
Issue date:	10/04/1979
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19209B689	List: ML19209B688 ML19209B701
References
LER-79-108-03L, LER-79-108-3L, NUDOCS 7910100337
Download: ML19209B701 (2)

Text

NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION wm .

LICENSEE EVENT REPORT CONTROL BLOCK: l l l l l l l (PLE ASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 O o i VAlN lA S 1 l@lIS 0 l0 l- 0 l0 14 l0 l0 l0 -l 0 023l@l426 1LICEN5E LIL E N5E NU*.'d E H l1 11T YPE l1 30l@lSi LAIS3 l@

l 8 9 LICENSEE CODE CON'T o i 5C i t i@l 01 51 01DOCK o fE T01 31 31 81@] (.3 01 fra I 01417 ] 91@l5 1 l 0 EVENT OATE 14

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REPORT D ATE l 6 t. 0 f> l N U'.* 3 E R EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 21 l On September 4, 1979, durino Mode 1 operation. the motor driven auxiliarv co n +.. u n ,- I o 3 l pump 1-FW-P-3A became inoperable when the pump's lube oil strainer was removed for 1 o 4 l maintenance after a lower than usual lube oil pressure was Observed. Tha hnalth and I o s j safety of the general public were not af fec+ed by this incident because the redundant I o c l auxiliary feedwater pumps 1-FW-P-3B and 1-FW-P-2 remained available for naaratio if l 0 7 l required. Reportable pursuant to T.S. 6.o.l.9.b. l 0 a l l

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44 4; CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i O The decrease in the pu r.p's lube oil pressure was caused by a partially cloaced lobe 1

[i li l l oil strainer. After bei.: removed and disassembled, the strainer was cleaned. adjm t-

, 7 i ed, and reinsta led. I IiI3I L I

i g 7 8 9 80 STA S  % PO/JER OTHER STATUS blSC V RY DISCOVERY DESCRIPTION i 5 l E @ l 0l ol2l@l NA l B l@l Surveillance Test l AC TIVI TY CO TENT RELEASED OF RELE ASE AVOUNT OF ACTIVITY LOCATION OF RELE ASE 7

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7 8 9 11 12 LOSS OF OR D AVAGE TO FACILITY TYPE DESCHIPTION i o Lzjgj NA -) ) ~7 l

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Pus t iCi TY DtSCR'PTION 7 910100 W / NHC USE ONLY

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

Attachment:

Page 1 of 1 Doc ke t No . 50-338 Report No. LER 79-103/03tc0 Description of Event On September 4,1979, during the performance of the monthly surveillance test, the lube oil pressure for the motor driven auxiliary feedwater pump 1-FW-P-3A was observed to be lower than usual. The pump's lube oil strainer was removed for maintenance rendering 1-FW-P-3A inoperable. This event is contrary to T.S. 3.7.1.2.a. .

Probable Consequences of Occurrence The consequences of this event were limited because the redundant motor driven auxiliary feedwater pump as well as the steam driven auxiliary feedwater pump were both available for operation if required. As a result, the public health and safety were not af fected by this event. There are no generic implications associated with this occurrence.

Cause of Occurrence The low lube oil pressure was caused by the lube oil strainer being partially clogged.

Immediate Corrective Action The lube oil strainer was removed and disassembled to allow for cleaning.

Af ter being thoroughly cleaned, the strainer was adjusted and reinstalled.

Scheduled Corrective Action No scheduled corrective action required.

Actions Taken to Prevent Recurrence No further actions are required.

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