ML17266A027

LER 78-045/03L-0 on 781204:digital Data Processing Sys Malfunctioned,Resulting in Loss of Control Element Assembly Backup Position Indication & Incore Flux Detector Sys.Caused by Programming Error

ML17266A027
Person / Time
Site:	Saint Lucie
Issue date:	01/03/1979
From:	Schoppman M FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML17206A625	List: ML17206A624 ML17266A027
References
LER-78-045-03L, LER-78-45-3L, NUDOCS 7901190139
Download: ML17266A027 (1)

Text

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RVRN-.OacAIPTICN .NO PRO'Saal R CCNSaeUSNCSS QO i Durin power o eration the Dioital Data Processin Svstem DOPS ma functioned. This resulted in loss of CEA backu position indication and

" ~QA the incore flux detector s stem u ed't o dis tribution.

ACTION re uired b S ecifications 3.1.3.3 and 4.2.1.3 was initiated. e.

DDPS was re aired and returned to serv'ice in 20 n te

~o y first occurrence involvin~ loss of the DDPS due to the cause described z'elow.

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CAUS 9" S RIPTION ANC RRxs IV= ACTIONS The cause of he DDPS malfunction was due to a ro rammin~ error. The program in error was corrected and placed back into the DDPS. The DDPS was placec oack int'o service in 20 minutes. Tt is believed that the program in e ror could have been the cause of recent DDPS failures.

(See L~R 335-78-25 and 78-39.)

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