ML19326A341

LER 78-048/03L-0:on 780508,fire Started When Operator Started Fire Pump.Caused by Starter Contact Component Failure.Defective Contacts Replaced.Electric Fire Pump Tested & Returned to Svc 780510

ML19326A341
Person / Time
Site:	Davis Besse
Issue date:	06/01/1978
From:	Chesko R TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19326A300	List: ML19326A298 ML19326A341
References
LER-78-048-03L, LER-78-48-3L, NUDOCS 8002030158
Download: ML19326A341 (2)

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lo12l l On .May 8, 1978 while perfor=ing the Fire Protection Svsten Electric Puro Weekly Sur- 1 g o g 3,  ; veillance Test, when an operator attenpted to start the fire pu=o, the starter con- 1

-joga; ; tacts arced causing a fire inside the starter cabinet. The electric fire oumo was  !

IoIsl l declared inoperable placing the unit in the Action State =ent of T.S. 3.7.9.la. There i .

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CAUSE DESCRIPTION AND CORRECT:VE ACTIONS h ji;o;lCo=cenent failure of the starter contacts was the cause of this occurrence. The Fire I g,;3j ] Brigade was su==oned and they out out the s=all fire in the breaker. The defective I

,,,; contacts uere replaced and the starter cabinet cleaned us. The electric fire ouro wasl

,,,3i  ; tested and returned to service at 1630 hours0.0189 days <br />0.453 hours <br />0.0027 weeks <br />6.20215e-4 months <br /> on 5/10/78, re=oving'the unit from the_ l i,,,,; Action State =ent of Technical Scecification 3.7.9.la. I 7 8 9

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TOLEDO EDISON COMPANY (N DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION I )

\' s/ SUPPLEMENTAL INFORMATION FOR LER NP-33-78-57 i

DATE OF EVENT: May 8, 1978 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: 3reaker contact failure en electric fire pump motor breaker. ,

Conditions Prior to Occurrence: The unit was in Mode 6, with Power (MWT) = 0, and Load (MWE) = 0.

Description of Occurrence: At 1000 hours0.0116 days <br />0.278 hours <br />0.00165 weeks <br />3.805e-4 months <br /> on May 8, 1978, while performing Surveil-lance Test ST 5016.02, " Fire Protection System Electric Pump Weekly Surveillance Test", an operator attempted to start the fire pu=p. When the operator pressed the start pushbutten, the starter contacts arced causing a fire inside the starter cabinet. The Fire Brigade was summoned and they put out the s=all fire in the starter. The electric fire pump was declared, inoperable placing the unit in the Action Statement of Technical Specification 3.7.9.la which requires both the diesel s and electric -fire pump at all times. The diesel fire pump was operable and availa-

)ble. A Maintenance Work Request was prepared to fix the breaker.

Designation of Accarent Caus'e of Occurrence: Component failure of the starter contacts was the cause of this occurrence.

Analysis of Occurrence: There was no danger to the health and safety of the public or to unit personnel. The loss of the electric fire pump did not affect the opera-tion or availability of the Fire Protection System as the diesel fire pump was available and operable.

Corrective Action: The defective contacts were replaced and the starter cabinet cleaned up. The electric fire pump was tested and returned to service at-1630 hours on May 10, 1978, removing the unit from the Action Statement of. Technical Specification 3.7.9.1.a .

• Failure Data: There have been no previous si=ilar occurrences.

i LER #78-048 i .

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