ML20079P585

Ro:On 910904,09 & 16,seismic Monitoring Instrumentation (Tape Decks 1 & 2 & Sensor 5) Inoperable for More than 30 Days.Playback Tape Deck & Sensor Repaired & Restored to Operable Status

ML20079P585
Person / Time
Site:	Byron
Issue date:	10/09/1991
From:	Pleniewicz R COMMONWEALTH EDISON CO.
To:	Davis A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
BYRON-91-0804, BYRON-91-804, NUDOCS 9111130068
Download: ML20079P585 (1)

Text

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Mr. A. Dert Davis Regional Administratos Region Ill U.S. Nuclear Reguintory Commission 799 Poosievelt Road Glen Ellyn, IL 60137 baar Sir This toport is submitted in accordance will. Dyron Stat.lon Unit One Operat.ing L1,:ense HPF-37 and Byron Station Unit Two Oper ativT Licence HPF-66 for Technical Specification 3.3.3.3, Action Statement a (Selsmic Monitoring instrumentation inoperable for more than 30 days).

On September 4, 1991, during the execution of the Selsmic Instrumentation 184 Dny Operability Verificat ton Surveillance, tape deck #1 (free fleid sennor) failed to record / play and the system was declared '.noperable. Technlcal Specification Limiting condition for Operation Action Requirement OliUS 3.3.3-1s was entered. Tape deck 01 was repaired. On September 9, 1991 topo dock 92 (conta.ument 8 foundation elevation 377' nonsor) failed to second/ play. Tape deck 12 was subsequently repaired. On September 16, 1991 sensor 5 (aux 111ary building elevation 426') talled and the playback tape dock faljed to playback. The playback tape deck and sensor 5 were subsequently repaired. On October 9, 1991 the operability surveillance was successfully P" formed and the system was rest ored to operable status.

Please contac Ronald Mancini of the Technical Staff if you have any questions regarding thia information. Mr. Mancini can be reached at (815) 234-5441 extension 2478.

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l kXbbhp R. Plenlewics j St ation Manager i

Hys on Nuclear Power Statlou ,

RP/ RAM /ph I ect W. Kropp, NRC Senior Resident inspector l U.S. NRC.Docement Control Desk, Washington D.C.

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