ML20050C428

LER 82-020/01T-0:on 820315,during Normal Operation,While Performing Surveillance Testing,Standby Diesel Generator 1G21 Tripped in Start Sequence.Caused by Procedural Deficiency.Procedures Rewritten

ML20050C428
Person / Time
Site:	Duane Arnold
Issue date:	03/29/1982
From:	Varner D IES UTILITIES INC., (FORMERLY IOWA ELECTRIC LIGHT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20050C419	List: ML20050C418 ML20050C428
References
LER-82-020-01T, LER-82-20-1T, NUDOCS 8204080493
Download: ML20050C428 (2)

Text

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aercar oara sa s .o si cocxerNu en is l evaNT DESCRIPTION ANC pmCdASLE CONSECUENCES @ ing surveillanceI testi lo 121 l During normal operation while perform g ; lesel generator 1G-21 tripped in start sequence. As required by Technica i ro,.il 1 Specification 3.8.8.1, a 7-day LCO was entered. The redundant diesel l io isi l generator was operable. The 7-day LC0 ended af ter approximately 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> l 1o is i i when 1G-21 was made operable. Diesel generator IG-21 may not have been a  !

lo irl l vailable for automatic start as designed for the precedinq 18 days. Ther i 1o#ai1 e have been no nrevious similar occurrences. so I

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y i;oi l Diesel trip caused by procedural deficiency which allowed both fuel oil  ;

I,t,l l iilters on 1G-21 to be changed without properly filling and ventina the 1 i,,2[I filter casings. Air in fuel oil line caused trio from fuel starvation. F i i- 1i i i l uel oil system was primed and vented and enaine tested sat. To oreclude I l

l - t i I. i t recurrence, orocedures will be written and modified.  !

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DUANE ARNOLD ENERGY CENTER

- Iowa Electric Light and Power Company Licensee Event Report .,upplemental Data Docket No. 050-0331 Licensee Event Report Date: 3/29/82 Reportable Occurrence No: 82-020 Event

Description:

During normal operation while performing the monthly surveillance testing, standby diesel generator 1G-21 tripped in the start sequence before reaching -

the rated frequency and voltage. As required by Technical Specification ,3 3.8.B.1 for an inoperable diesel generator, a 7 day limiting condition for ,s i; operation (LCO) was entered. The redundant standby diesel generator, 'lG-31 '\ ,

was operable. The 7-day LC0 was ended af ter approximately 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> when 1G-21 1 ' \w;s 3 was made operable. In addition,1G-21 may not have been available for i automatic start, as designed, for the preceding 18 days (see catise description below). There have been no similar previous occurrences. .

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Cause Descriptig:

s The diesel generator trip was caused by a procedural de#iciency which, allowed both fuel oil filters on diesel generator 10-21 to.bc< changed on February 25, % v 1982 without requiring thatsthe filter casings be properly filled and vented?

Airwaspresent.in,thefueljillinecess]ng,1G-21totripfromfuel '

starvatto daring the start' sequence. * , ,

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At the time, it was misthkenly believed'*.hatJthe fuel oil filters were to be changed without making the'di,esel ger:eratur-inoperable. . Thus 1G-21 was not >

declared inoperable,when its fil.ters were changed. For=theqsame reason,spost t maintenance opebabbli,ty; testing wss net, performed."

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CorrectiveActioni The fuel oil system for, diesel genera' tor 1G-21 was primed and vented.$ Then 1G 21 was functionally tested satisfactorily and made operable to end.the 7-day CCO entered that day.

To prevent recurrence, maintenance procedures for diesel generator fuel oil filter maintenance w'ill be c'eveloped by April 15, 1982.

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' Administrative dentrols will be mcdified to assure post maintenance operability of safety related equipment. These changes will include a mechanism to ensure that safety related maintenance is performed in accordance with adequate maintenance procedures. In addition, an independent review by qualifie6 personnel to verify the adequacy of post maintenance .

operability testing will be required. These changes will be in place by May s

15,.1982. -

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