ML19257A885

LER 79-043/03L-0:on 791212 Channel,A Wide Range Nuclear Instrument Discovered to Be Malfunctioning.Caused by Ctr Pin in Connector Parting from Fission Chamber Extender Cable Conductor.Conductor Repaired

ML19257A885
Person / Time
Site:	Calvert Cliffs
Issue date:	01/03/1980
From:	Davis S, Rizzo P BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19257A882	List: ML19257A881 ML19257A885
References
LER-79-043-03L, LER-79-43-3L, NUDOCS 8001090346
Download: ML19257A885 (2)

Text

. NRC FORM 366 U. b. NUCLtAH HtGUL AIUHY CUMM15SIUN (7 77)

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LICENSEE EVENT REPORT ,

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DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h O 2 l At 0705 Channel A wide range nuclear Instrument (WRNI).was discovered to l 0 a i be malfunctionino. The instrument was olaced out of service in accordance O A t wi th T.S . 3.3.1.1. The three redundant WRNI channels remained operable l 0 s I during the event. Channel A WRNI was returned to service at 1630. This l g l is not a repetitive occurrence.

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CAUSE OESCRIPTION AND CCARECTIVE ACTIONS h i o l The problem was found to be a lack of fission chamber current from the Ch.

LLLLJ l A Wide Rance detector. This was caused by the center ein in a connector' I

, , having parted from the fission chamber extender cable conductor. Lack of i i a l fission chamber current caused erratic indication. I i 4 l l

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NAME OF PREPARER PHONE:

LER NO. 79-43/3L DOCKET NO. 50-318 EVENT DATE 12/4/79 REPORT DATE 1/2/80 ATTACHMENT CAUSE DESCRIPTION AND CORRECTIVE ACTION: (CONTIN.UED)

The connector was repaired, and satisfactory indication was restored.

- Detector and extension cable connectors are routinely disconnected and tested or cleaned. It is believed that this type of failure is an effect of the wear and deterioration-normally expected to occur through handling. This type of failure has not been repetitive, th6refore, no preventive action is presently -

being taken to prevent recurrence.

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