ML20039C551

LER 81-077/03L-0:on 811204,B Emergency Diesel Generator Control Circuit Discovered Grounded During Surveillance Procedure SP-354,rendering Generator Inoperable.Caused by Electrical Conduit Separation,Rubbing Insulation Off Wiring

ML20039C551
Person / Time
Site:	Crystal River
Issue date:	12/23/1981
From:	Charles Brown FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20039C542	List: ML20039C541 ML20039C551
References
LER-81-077-03L, LER-81-77-3L, NUDOCS 8112290452
Download: ML20039C551 (2)

Text

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- Es E .T DESCRIPTION AND FROS ABLE CONSEQUENCES h p q l At 0000, during performance of SP-35u, Monthly Surveillance. it was discovered I io ;3 ; l that EDG"B" control circuit was grounded. Tais is contrary t.; havine two (2) l l l o 14 l l separate independenC diesel generators operable. T. S. 3.8.1.1. EDG"A" was fast l g , ; started and maintenance was initiated on EDG"B".

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SUTPLEMENTARY INFORMATION

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,e Report No.

50-302/81-077/03L-0

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,, Facility: Crystal River Unit 3

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Report Date: December 23, 1901 Occurrence Date: December 4, 1981 Identificillon of Occurrence:

Emergency Diesel Generator "B" was declared inoperable due to a grounded coatrol circuit w:iile performing Surveillance Procedure SP-354. This event is contrary to having two (2) separate and independent diesel generators operable, Tech-nical Specification 3.8.1.1.

Conditi6ns Prsor to Occurrence:

Mode 4 hot shutdown (0%).

Description of.0ccurrence:

At 0000, during performance of Surveillance Procedure SP-354,

.- it was discovered that Emergency Diesel Generator "B" had a

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grounded control circuit. Emergency Diesel Generator "A" was fast started and maintenance was initiated on Emergency Diesel Generator "B". The grounded circuit was located and repaired. Operability was restored at 0700 on December 4, 1981.

Designatiun of Apparent Cause:

The cause of this event is attributed to electrical conduit separation which rubbed the insulation off of the control circuit wiring.

Analysis of Occurrence:

There was no effect upon the health or safety of the general public.

Corrective Action:

The rubbed area was insulated, and Emergency Diesel Generator "B" was tested satisfactorily. Work Request #29652 was written to replace affected control circuit wiring and electrical con-duit by January 30, 1982. EDG"A" was inspected and no prob-lems were found.

Failure Data-This was the first occurrence of this type, and this is the twenty-fifth event reported under this Specification.

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