ML20041C388

LER 82-003/03L-0:on 820126,overload Alarm Condition Received While Closing Valve RHR-MO-26B,caused by Motor Brake Coil Failing to Release.New Motor & Brake Installed & Tested Satisfactorily

ML20041C388
Person / Time
Site:	Cooper
Issue date:	02/17/1982
From:	Schaaf F NEBRASKA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20041C386	List: ML20041C385 ML20041C388
References
LER-82-003-03L, LER-82-3-3L, NUDOCS 8203010262
Download: ML20041C388 (1)

Text

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O 2 l During S.P. 6.3.5.2, an overload alarm condition was received while closing RHR-M0- l O 3 l 26B valve. The valve did go fully closed; the overload contacts were reset and alarm l 0 4 l cleared. The subject valve is the outboard isolation valve for the "B" loop contain- l 10151 l ment spray. Failure of this valve is any position other than full open would reduce l 0 6 l' the flow for "B" loop containment spray in which case the "A" loon could supply 100% l I O l 71 l required flow. There were no adverse consequences to the nublic health and safety I l O l a I I (RTS 3. 5.B) . l 7 8 9 80 SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUtsCODE COMPONENT CODE SUBCODE SUBCODE j l_Oj 9J

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CAUSE DESCRil8 TION AND CORRECTIVE ACTIONS I1lOi l Operator for subiect valve is Limitorque SMB 6. The motor brake coil failed to re- 1 i i l 1 ease. This in turn caused the motor to overload and nive overload alarm condition. I i 2 1 New motor and brake were installed and tested satisfactorily. I {

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