ML17266A245

Revised LER 80-003/03L-1:on 800106,during Normal Operations, Control Element Assembly 30 Reed Switch Position Indication Channel Failed.Cause Is Unknown.Channel Repaired & Returned to Svc

ML17266A245
Person / Time
Site:	Saint Lucie
Issue date:	07/24/1980
From:	Pace P FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML17208A912	List: ML17208A911 ML17266A245
References
LER-80-003-03L, LER-80-3-3L, NUDOCS 8008210482
Download: ML17266A245 (2)

Text

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REPORTABLE OCCURRENCE 335-80-3 LICEllSEE EVENT PEPORT PAGE Tl/0 ADDITIONAL EVENT DESCRIPTION AND PROBhBLE CONSE UENCES During normal 100% power operation, CEA !-'30 reed switch posit:ion indication channel failed. The channel vas declared inoperable. Xn accordance vit:h Technical Specification 3.1.3.3, CEA /!30 vas vit:hdrawn to t: he upper electrical limit position ("full out"), and was verified at t:his position at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> as power operation continued. Eleven days later, following an unrelated plant trip, investigation of the cause for the channel failure seemed to indicate a shorted power cable in the vicinity of the react:or vessel head. This cable vas replaced with a spare cable, but the failed channel remained inoperable. A second sphere cable was installed and the channel became operable. - The channel vas successfully t:est:ed for satisfactory operation and declard operable. The plant was started up and returned to 100% power operation.

Eight'days after ret:urning this channel to operable status, it failed again.

Action per Tech. Spec. 3..1.3.3 was reinstated until plant shutdown for the Harch 15, 1980 refueling. During the refueling, all CEA 830 cables and connectors vere visually inspected, continuity'hecked, and meggered. In addition the channel reed switch probe was replaced. No specific problem was ever found, hovever the channel was successfully test;ed for satisfact:ory" operation and no further problems have been noted since the plant returned to pover operation.

All CEA's were fully trippable during the above events.