ML19347B635

Updated LER 80-010/03L-1:on 800311,containment Vacuum Breaker Isolation Valve 11 Opened at 0.57 Psi Rather than 0.5 Psi.Caused by Drift in Differential Pressure Switch. Setpoint Adjusted & Satisfactorily Tested

ML19347B635
Person / Time
Site:	Prairie Island
Issue date:	10/08/1980
From:	Hunstad A NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19347B626	List: ML19347B625 ML19347B635 ML19347B642 ML19347B646
References
LER-80-010-03L-01, LER-80-10-3L-1, NUDOCS 8010150471
Download: ML19347B635 (1)

Text

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14 is REPORr oATE e0 EVENT DESCRIPTION AND PROSASLE CONSEQUENCES h o 2 lDuring surveillance test, No. 11 containment vacuum breaker isolation valve opened I o lat 0.57 pai, this is outside the limit of 0.5 psi set in Tech Spac 4.4.C. Nnt l l

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, ,  ; Apparent drift in a Barton Mode 88A differential pressure switch. Setpoint was ,

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