ML19254D846

LER 79-131/03L-0:on 790926,emergency Diesel Generator 1H Tripped During Manual Start to Verify Operability.Possibly Caused by Accumulation of Air in Fuel Filter.Diesel Was Restarted & Cause Is Being Further Investigated

ML19254D846
Person / Time
Site:	North Anna
Issue date:	10/26/1979
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19254D843	List: ML19254D842 ML19254D846 ML19254D850
References
LER-79-131-03L, LER-79-131-3L, NUDOCS 7910300246
Download: ML19254D846 (2)

Text

NRC FORM 366 U. S. NUCLE AR REGULATORY COMMISSION (7 77) ' '

LICENSEE EVENT REPORT CONTROL BLOCK: l l l l l l l (PLEAsE PRINT oR TYPE ALL REQUIRED INFORMATION) 1 6 lo l1l lV l A N l A lS l114l@l 0 l 0 l -l 0 l LICENSE l 0 l 0 l - 0 l 023l@l264 l 1 0 l 0 NUVdER l 1 l 1 l 1]@l57 LICENSE TYPE .60 CAI 58 l@

7 8 9 LICENSEE CODE lb CON'T o i "OM ib0L l@l0 l 5 l0DOCKET l0 10 l3 3 l8 l@l0I9l2l6l7lgl@l1l0l7I6I7l9l@

68 69 EVENT DATE 74 75 REPORT DATE 80 7 8 Gl NU?10ER EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 l0n September 26, 1979, with the unit in Mode 4, Emergency Diesel Generator 1H tripped l The health and safety of the general o 3 [during a manual start to verify operability. l 1014] public were not affected because the diesel generator was immediately restarted and l lo[3l l satisfactorily operated. This event is reportable pursuant to 6.9.1.9.b. l 101611 0 7 l 0 8 1 80 7 8 9 SYS1 E M CAUSE CAUSE COVP. VALVE CODE CODE SU8 CODE COMPONENT CODE SU8 CODE SUBCODE o 9 lE lE l@ ]@ W @ lFl lL lT lE [R l @ g @ W @

9 10 12 13 18 19 20 7 8 11 SEQUE NTI AL OCCURRENCE REPORT REVISION EVENT YEAR REPORT NO. CODE TYPE NO.

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41 l42Nl@ [Aj@ l Cl 4l 7l 0l@ 44 47 33 34 35 36 31 40 43 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i O lThe Diesel generator trip is suspected to have been caused by an accumulation of air I i i in the fuct filter. The diesel was immediately restarted and operabili:_,- was veri fied. ]

g,g7g lThe cause is being further investigated to determine the actions necessary to eliminatel

, 3 the problem. I I

11 1411 80 7 8 9 STA S  % POWER OTH ER STATUS DISC V FY DISCOVEHY DESCRIPTION NA Operability Test l li Is l lG l@ l 0l 0 l 0 l@l l Cl@l ACTIVITY CO TENT RELEASED OF RELE ASE AMOUNT OF ACTIVITY LOC ATION OF RE LE ASE li 16 I [Z j @ 10[zj@l NA 44 l l 45 NA 80 l

7 8 ) 11 PERSONNE L EXPOSURES NUYBER l

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

Attachment:

Page 1 of 1 Docket No. 50-338 Report No. LER 79-131/03L-0 Description of Event On September 26, 1979, with the unit in hot shutdown, Emergency Diesel Generator 1H was manually started to verify operability. During the test the diesel genera-tor tripped after 30 seconds. This event is contrary to T.S. 3.8.1.1.b. and re-portable pursuant to T.S. 6.9 1.9.b.

Probable Consequences of Occurrence The consequences of this event were minimal because the diesel generator was immediately restarted and proper operation was observed. As a result, the health and safety of the general public were not affected. No generic impli-cations exist for this event.

Cause of Occurrence The diesel generator trip is suspected to have resulted from an accumulation of air in the fuel filter.

Immediate Corrective Action The 1H Diesel Generator was satisfactorily restarted and demonstrated operable.

Scheduled Corrective Action To be determined by the investigation.

Actions Taken to Prevent Recurrence Further investigation will be performed to determine the actions necessary to eliminate air from accumulating in the fuel filter.

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