ML20002A737

LER 80-080/03L-0:on 801017,20,21 & 23,CEAC 2 Failed.Caused by Failure of Optical Isolator on First Three Days & Failure of Oxygen Pressure Module Card on Last Day.Optical Isolator & Oxygen Pressure Card Were Replaced

ML20002A737
Person / Time
Site:	Arkansas Nuclear
Issue date:	11/14/1980
From:	Pendergraft R ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20002A736	List: ML20002A735 ML20002A737
References
LER-80-080-03L, LER-80-80-3L, NUDOCS 8011210454
Download: ML20002A737 (1)

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T D AT E to 7 8 er 63 DoctETNuutEn EVENT DESCRIPTION AND PROSADLE CONSEQUENCES h io s a t I During Mode 1 operation while performina testina/ maintenance. CEAC #2 1 toi3i l failed on the following dates; 10-17-80, 10-20-80, 10-21-80, and i o . I 10-23-80. In all cases the alternate CEAC #1 was verified operable. I lo isi i The CEA positions were manually monitored at_4 hour intervals. Similar I o o I to LER's 50-368/78-020.79-004. 79-073.80-053. and 80-058. Reoortable i o > i per Tech. Spec. 6.9.1.9.b. I l olu l 1 I

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JJ 34 35 36 33 49 el 41 43 op CAUSE DESCRmTION AND CORREC flVE ACTIONS h liio i 1 Investigation revealed the optical Isolator for Bit 12 on the data iink i i i I input card had failed in the first 3 cases. The optical isolator was i i,12i i replaced. On 10-23-80 the CEAC #2 failure was due to a failed OP module i i 3 I card for the test circuit. The OP module card was replaced. In all cases i . I CEAC #2 was returned to coerable status .per T.S. Table 3.3.1-1 Action Sa.

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