ML20008F707

LER 81-003/03L-0:on 810223,RHR-MO-26B Motor Amps Increased & Remained Excessively High When Valve Reached Closed Position.Caused by Limit Switch on Limitorque SMB-O Valve Motor Operator Not Opening & de-energizing Starter

ML20008F707
Person / Time
Site:	Cooper
Issue date:	03/25/1981
From:	Bednar L NEBRASKA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20008F704	List: ML20008F703 ML20008F707
References
LER-81-003-03L, LER-81-3-3L, NUDOCS 8104210523
Download: ML20008F707 (1)

Text

U.S. NUCLEAR REGULATORY COMMISSloN

.t***(FORM 366 ~

b LICENSEE EVENT REPORT (PLEASE PRINT OR TYPE ALL REoUIRED INFORMATION)

CONTROL 8 LOCK: l 1

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REPORT DATE 7 8 60 61 DOCK ET NUMBER 68 EVENT DATE EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h 10121 burine S.P. 6.3.5.2. RHR-MO-26B motor acos increased and remained excessive 1v high I

,Oi3, lwhen valve reached its closed position. The valve motor breaker was manually tripped l

o ,4 i land the valve de

lared inoperable. No other significant occurrence took place. Re- l 90,3, ;dundant systems were operable. This event presented no adverse effects upon public l l0isi pealth and safety. [

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JJ 34 31 40 42 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 l i j o l lA limit switch on a Limitorque SMB-0 valve motor operator did not open when valve l

,,,,ygreached its closed position and the valve starter could not deenergize. The limit  ;

,,,,, gswitch was adjusted and correct operation of the valve was verified. Subject valve ,

g lwill be internally inspected during April 1981 refueling outage. g I

til41 1 i e 9 eo STA  ; POV<E R OTHE R STATUS IS O RV OISCOVERY OESCRIPTION Ii l5 l l El@ l 0l 91 2l@l NA l J @l Operator Observation l ACTivtiv CO TENT AELE ASED OF RELE ASE AMOUNT OF ACTIVITY LOCATION CF RELEASE lilsI W @ M @l 7 N 9 10 11 NA 44 l l 45 NA 80 l

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