ML19344A448

LER 80-024/03L-0:on 800718,during Normal Operation,Control Room Personnel Reported UPS-1B Trouble & Loss of Voltage to MC-89B.Caused by Failed Logic Power Supply Board. Component Replaced & Unit Operationally Tested

ML19344A448
Person / Time
Site:	Vermont Yankee
Issue date:	08/15/1980
From:	Murphy W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19344A447	List: ML19344A446 ML19344A448
References
LER-80-024-03L, LER-80-24-3L, NUDOCS 8008200334
Download: ML19344A448 (1)

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PORT oATE 7 4 60 6' ooCKET NUMS ER 68 69 EV ENT o ATE EVENT DESCRIPTtCN AND PRC8ABLE CONSECUENCES h Iol2; I During normal operatioun Control Room persennel reported UPS-13 trouble and loss of I l o l a l l voltage to MCC-89B. MCC was energized by Maint. tie. Alternate testing began in l lo (4i laccordance with T. S. Sec. 3.10.3.4 and 3.5.A.4. Trouble shooting revealed a failed 1 I o i s i lf ogic power supply ocard. The compo'nent was replaced, the unit operationally tested l l o is i land returned to service within approx. 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> af ter failure. The redundant UPS-1A l lol7l l was available and operable. There were no adverse affects ':o the public health and ,

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a , a j l saf ety. There were no similar occurrences reported. l 7 e, n

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44 47 33 34 JS 36 37 40 el 42 43 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h li j ol l An Exide Power System. 250 KVA uninterruptible power supply had tripped because of a l 4

gi bicwn logic power supply fuse. This failure was caused by a failed diode which I m,,g blew the board fuse. The corrective action was to replace the circuit board and I i, i3i l operationally test the unit. l 1

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