ML19338C948

LER 80-017/03L-0:on 800724,during Testing,Pressure Switch PS-2-1622B Was Found to Actuate at 20.3 Rather than 13.8 Inches of Water.Caused by Setpoint Drift.Switch Replaced

ML19338C948
Person / Time
Site:	Quad Cities
Issue date:	08/12/1980
From:	Steffes C COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19338C947	List: ML19338C946 ML19338C948
References
LER-80-017-03L-05, LER-80-17-3L-5, NUDOCS 8009080417
Download: ML19338C948 (1)

Text

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U.s. NUCLEAR REEULATO2Y COMMISSloN NRC FORf.I 366 * *

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• LICENSEE EVENT REPORT CONTROL BLOCK: l l l l l lh 6

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EVENT DESCRIPTION AND PRO 8ABLE CONSEQUENCES h lo I:I l While performing Torus to Reactor Building Vacuum Breaker Surveillance Test, qts-48, l Es i36l pressure switch PS-2-1622B was found to actuate at 20.3 inches of water. Technical l 6 3 la ; l Specification 3.7.A.3.a. requires actuation at less than 13.8 inches of water. The l 1e i3; I redundant 100 percent flow vacuum breaker A0-2-1601-20A was operable and would have l

!: sI1 actuated had the need arisen. Subsequently, safe operation was not affected.  ;

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, i: ll The cause of this occurrence was setpoint drif t. The switch could not be reset I t'l'1I properly due to wide fluctuations in the setpoint. The switch was reolaced and I

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