ML19210C424

LER 79-037/03L-0:on 791005,analog Meter in Channel Zf Containment Pressure Bistable for SIAS Found Nonlinear in Response to Surveillance Test Input Signals.Caused by Aging of Meter Movement.Meter Replaced

ML19210C424
Person / Time
Site:	Calvert Cliffs
Issue date:	11/05/1979
From:	Lagiewski J BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19210C423	List: ML19210C422 ML19210C424
References
LER-79-037-03L, LER-79-37-3L, NUDOCS 7911140235
Download: ML19210C424 (1)

Text

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EVENT DESCRIPTICN A*JC PROBABLE CONSEQUENCES h o  : IDurino nomal oneration ESFAS sensor cabinet ZF 'ias deanornized .f_ rom I c 3 1440 until 1550 per T. S. 3.3.2.1 while reolacing the failed containment nressure i o 4 Isensor voltaCe reter. Three redundant ESFAS sensor channels rvaired I o s lacerable thrcuchout this event. This is rot a recetitive occurrence. I a s l I O 7 l 1 l3 4 l I 7 9 3 80 S v 5 T E *.9 CAUSE CALSE C C '.' P '. A t V E C00E CODE SL9C00E C;YGCNENT CCOE ^ 5CCCE

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23 26 40 42 44 47 CAUSE CESCRIPTICN AND CORRECTIVE ACTIONS i o IThe analoa meter in Channel ZF ccntain'ent nressure bistable for SI AS I i i pas found to be ncn-linear in its resoonse to surveillance test inrut I i

Isionals. This failure is considered to be a natural end of life tvne I i 3 jof failure caused by acine of the reter movement windino. The reter I i 4 iwas replaced. !!o oreventive action is aeemed necessarv. I 7 8 9 80 ST S . PC?.E R OTHER$7ATUS S OV RY DISC OVERY OESO7tPfeON i 5 lE j@ l1 l 0 l 0 l@l fl/A l B l@l'8Surveillance Test l

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