ML19261B206

LER 79-003/03L-0 on 790109:2A Offgas Radiation Monitor Failed Downscale.Dirt on Contacts of Trip Test/Zero Calibr Switch Caused Input Key to Remain Deenergized Upon Release of Switch.Contacts Were Cleaned & Monitor Returned to Svc

ML19261B206
Person / Time
Site:	Peach Bottom
Issue date:	02/06/1979
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
LER-79-003-03L, LER-79-3-3L, NUDOCS 7902140167
Download: ML19261B206 (1)

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Mr. Boyce H. Grier, Director No. 2 3/03-L-0 Office of Inspection & Enforcement, Region 1 U.S. Nuclear Regulatory Comission 631 Park Avenue King of Prussia, PA 19406

Dear Mr. Grier:

This L.E.R. refers to the failure of the 2A off-gas radiation monitor (RIS-2-17-150A). This failure constitutes creratien in a degraded mode allowable in the limitir4 conditions of operations. The governing Technical Specification is 3.2.D.l(b).

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o l Investirstion revealed that dirt on the centacts of the trip t Ef test /zero cal switch caused the input relay K3 to remain deenergized I i ; i upon release of the switch, thus openir4 the input to the moniter. i ml The centacts of the switch were cleaned and the ronitor was returned to service within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> following satisfactorv surveillance testir4 mI i e e no t

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