ML19319B578

LER 78-062/03L-0:on 780604,diesel Generator 1-1 Failed to Operate W/Proper Frequency & Voltage.Caused by Primary Potential Fuse Component Failure.Fuse Replaced

ML19319B578
Person / Time
Site:	Davis Besse
Issue date:	06/28/1978
From:	Beeler T TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19319B573	List: ML19319B572 ML19319B578
References
LER-78-062-03L, LER-78-62-3L, NUDOCS 8001270103
Download: ML19319B578 (2)

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lh (PLE ASE PRINT OR T'. ELL RECUIRED INFORMATION) l 01 Hj Dl Bl Sl 1l@l0 l0 l- l0 l0 lN lP IF l IO l1-25l@!264 I 1UCENSE l 1 !TYPE 1 l JG1 lh!_ l SSl@

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[o !al l Operate with proper frequency and voltage. The test was suspended and DG l-1 declaredl Io Ie 1 l inoperable. The unit was in Mode 6 at the ti=c of the occurrence. This incident is l Io isi I being reported as a component failure. There was no danger to the health and safety [

i l o 16 j l of the public or unit personnel. Diesel Generator 1-2 was operable had e=ergency (NP-33-78-74) l I O l 7 l l power been required.

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EVENT YEAR

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64 47 33 34 35 CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS f

ji joll The cause of this occurrence can be attributed to a cennonent failure of a ortra n lt ; i j l potential fuse for the diesel generator. The crimarv cotential fuse for DC 1-1 v w I

,,,7, l replaced. At 1515 hours0.0175 days <br />0.421 hours <br />0.0025 weeks <br />5.764575e-4 months <br /> on 6/4/78, the Diesel Generator Monthlv Test was ececleted I I

l3 ;3j l and the diesel generator declared operable.

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TOLEDO EDISON COMPANY DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATION FOR LER UP-33-78-74 l DATE OF EVENT: June 4, 1978 FACILITY: Davis-Besse Unit 1 ,

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IDENTIFICATION OF OCCURRENCE

Diesel Generator 1-1 declared inoperable on June 4, 1978.

l l Conditions Prior to Occurrence: The unit was in Mode 6., with Power (5"I) = 0 and Load (M4E) = 0, a

Description of Occurrence: At 0545 hours0.00631 days <br />0.151 hours <br />9.011243e-4 weeks <br />2.073725e-4 months <br /> on June 4,1978, while performing Surveil-l

lance Test ST 5031.07, " Safety Features Actuation System (SFAS) 18 Month or Refuel-ing Test" Diesel Generator 1-1 came up to speed but the generator breaker did not j

close. The test was suspended at this point, and Surveillance Test ST 5081.01,

" Diesel Generator Monthly Test", was performed. Upon starting Diesel Generator 1-1, l l the frequency was' not stable and the generator voltage was icw. The test was sus- ,

pended at this point, and the diesel generator declared inoperable.

This occurrence did not place the unit in the Action Statement: of Technical Speci-fication 3.8.1.2 because the unit was in Mode 6, which requires only one diesel generator to be operable while in Modes 5 or 6. This incident is being reported as a component failyss.

Designation of Aeoarent Cause of Occurrence: The cause of this occurrence can be i attributed to a component failure of a primary potential fuse for the diesel generator.

Analysis of Occurrence: . There was no danger to the health and safety of the public or to unit personnel. Diesel Generator 1-1 was not required for emergency power during the period of time it was inoperable.- Diesel Generator 1-2 was operable had emergency power been required. ,

j Corrective Action: Under Maintenance Work Order 78-1332, the primary potential fuse for Diesel Generator 1-1 wcs replaced.

4 At 1515 hours0.0175 days <br />0.421 hours <br />0.0025 weeks <br />5.764575e-4 months <br /> on June 4,1978, Surveillance Test ST 5081.01, Diesel Generator Monthly Test, was completed and the diesel generator declared operable.

1 ,

Fa i lure Data: No previous si=ilar events have occurred.

4 LER #78-062

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