ML19254F893

LER 79-033/03L-0:on 791025,while Performing Diesel Generator Monthly Load Test,Unit 1/2 Diesel Generator Failed to Accept Full Rated Load of 2,500 Kw.Caused by Plugged Oil Filter. Filters Replaced & Governors Adjusted

ML19254F893
Person / Time
Site:	Quad Cities
Issue date:	11/06/1979
From:	Hoeller J COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19254F889	List: ML19254F888 ML19254F893
References
LER-79-033-03L-02, LER-79-33-3L-2, NUDOCS 7911190361
Download: ML19254F893 (2)

Text

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EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 l While performing the Diesel Generator Monthly Load Test. Drocedure 00S 6600-1.

o a i the Unit 1/2 diesel generator failed to accept full rated load of 2500 KW. In l o .

l accordance with Technical Specification 3.9.E.1 the Unit One and Two diesel generatorsL a s I and the low pressure core cooling systems, and all loops of the containment cooling l 0 6 l modes of the RHR system were demonstrated operable. Both Unit diesel generators would!

0 7 I have been capable of carrying the necessary loads had the need occurred. l 0 8 l l 7 8 9 80 SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUSCODE COMPONENT CODE SUSCODE SUSCCCE *

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35 31 40 di 42 43 44 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 1 o l The cause of this occurrence was a cartially olucced fuet oil filter. Correceive l li li j i action was to replace the filter and successfully demonstrate the 1/7 d i ec:e 1 ganar e r i 2 l to be operable. The fuel filters en Unit One and Two diesel cenerators were also I

, 3 l changed. Samples were taken from the fuel oil storage tanks and the diesel day oil l i 4: l tanks and will be analyzed. I 7 a 9 80 STA S *

. POWER OTHER STATUS IS O RY DISCOVERY DESCRIPTION s

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J. Hoeller PwONE 309-654-2241 ext. 171

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1. LER NUMBER: LER/R0 79-33/03L-0 ll. LICENSEE NAME: Commonwealth Edison Company quad-Cities Nuclear Power Station 111. FACILITY NAME: Unit One IV. DOCKET NUMBER: 050-254 V. EVENT DESCRIPTION:

At 6:45 AM on October 25, 1979 while performing monthly routine testing, Q0S 6600-1, the Unit 1/2 diesel generator failed to accept full rated load of 2500 KW. With the 1/2 diesel generator loaded to bus 23-1, erratic behavior was observed at approximately 2200 KW. At 7:05 AM the load was switched to bus 13-1 with the same result. With the diesel generator running at 500 KW the operations department began investigating the situation.

In accordance with Technical Specification 3.9.E.1 the Unit One and Two diesel generators, and the low pressure core cooling systems, and all loops of the containment cooling mode of the RHR system were demonstrated operable. The problem was believed to be related to the diesel generator governor and work request Q 01620 was written. Unit One was operating in the RUN mode at 812 MWe and 2459 MWt and Unit Two was operating in RUh at 410 MWe and 1366 MWt.

VI. PROBABLE CONSEQUENCES OF THE OCCURRENCE:

The effect of the event on the overall safety of the reactor was minimal. Both unit diesel generators were verified operable as required, and would have been capable of carrying the necessary loads had the need occurred.

Vll. CAUSE The apparent cause of the occurrence was a plugged fuel oil filter. Initially the problem was thought to be the governor; however, while this was being replaced, the fuel oil filter was checked and found to be fouled. This was inhibiting proper flow and causing a reduction in the capability of the diesel generator to accept full load. The fuel oil filter is manufactured by Electro-Motive Division of G.M.

Vill. CORRECTIVE ACTION The immediate corrective action was to replace the governor and fuel oil filter. With these installed, the 1/2 diesel generator was run and declared to be in an operable status, however, the new governor fine adjustments were not totally satisfactory., The old governor was then reinstalled with resultant acceptable operation. Samples were taken from the fuel oil storage tanks and will be analyzed. The fuel filters on the Unit One'and Two diesel genrators were also changed.

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