ML19305D840

LER 80-010/03L-0:on 800311,during Surveillance Test, Containment Isolation Valve 11 Opened at 0.57 Psi.Caused by Apparent Drift in Barton Model 288A Differential Pressure Switch.Setpoint Adjusted & Valve Retested Satisfactorily

ML19305D840
Person / Time
Site:	Prairie Island
Issue date:	04/10/1980
From:	Hunstad A NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19305D837	List: ML19305D836 ML19305D840
References
LER-80-010-03L, LER-80-10-3L, NUDOCS 8004150603
Download: ML19305D840 (1)

Text

NRC FOn84 385 U. E. NUCLEAR REG!LATORY COMMISSION (7 77)

LICENSEE EVENT REPORT CONTROL BLOCK: l i

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7 8 60 81 DOCKET NUM8ER 88 89 EVENT DATE 74 75 REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h O 2 lDuring surveillance test, No. 11 containment vacuum breaker isolation valve opened l O 3 lat 0.57 psi, this is outside the limit of 0.5 psi set in Tech Spec 4.4.C. Nnt l 0 4 l repetitive. No effect on public health and safety. Redundant device was operable. l l

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS

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

, ,  ; adiusted and valve retested satisfactorily.  ;

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IS$UE DESCRIPTION

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7 8 9 10 68 69 80 g A A Hunstad 612-388-4767 l NAME OF PREPARER _ PHONE: {

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