ML20050A980

Updated LER 81-188/01X-1:on 811216,during Performance of ESF Actuation Periodic Test,Reset Switches a & B Failed to Operate.Caused by Silver Sulfide Coating Buildup on Switch Contacts.Switches to Be Replaced W/Gold Plated Contacts

ML20050A980
Person / Time
Site:	McGuire
Issue date:	03/15/1982
From:	Nardoci P DUKE POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20050A970	List: ML20050A969 ML20050A980
References
LER-81-188-01X, LER-81-188-1X, NUDOCS 8204020468
Download: ML20050A980 (1)

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car oare u EVENT OESCRIPTION ANO PRosAsLE CONSEQUENCES h o phile in Mode 5, during performance of the Engineered Safety Features (ESP) Actug-ma ition Perlodic Test. various initiate and reset switches on "A" and "B" trains t

. l' ailed to acutate their designed devices, and were declared inoperable. This is l M treportable pursuant to T.S.6.9.1.12(e). No incidents have occurred since fuel I g floadine which required manual actuation of th< ESF loads. If the switches had g a r lieen needed", all of the required devices could have been actuated by repeatedly I a pycling the defective switches. Therefore, the health and safety of the public g I e SJere ito t ci t i e e t eti . -

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es CAusE OEsCRiPT10N ANO CORRECnVE ACTIONS h g I'.xamination and analysis by Cutler Hammer found that a silver sulfide coating wag g l>uilding up on the switches silver plated switch contacts, and the low voltages ,

E finvolved were unable to establish a current path through the coatina. All appro-g g lpriate ESF manual switches will be replaced with new switch blocks having gold  ; ,

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