ML20064B752

/03L-0 on 780904:during Surveillance Test Unit 3 Dmain Steam Radiat Monitor Failed to Cause a Half Scram Due to Defective Transistor.Transitor Was Replaced & Monitor Returned to Svc in 6 Hours

ML20064B752
Person / Time
Site:	Peach Bottom
Issue date:	09/26/1978
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Grier B
References
LER-78-016-03L, LER-78-16-3L, NUDOCS 7810100096
Download: ML20064B752 (1)

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Mr. Soyce M. Grier, O f ractor No. ]=78-16/31.

Office of Insoection & Enforcement, Region i U.S. Nuclear Regulatory Cannission 63I Part. Aven A Aing of Pr.assi a, PA , , f 9406 ,

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Dear Mr. Griers This 1.E.3. ' refers to the fai; re of the 'D' sain stea'. line C radiation moottor during a surveillance test. The ;overning Techsical Specification is 3.1 (Table 3.1.1).

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Wi gne a surveillance test t'r.i t 3 'D' 'nain steam ifne radiation monieor I-g, failed to gause a half scram whcn the test potentionater was run upscale g I) 6. I l past the H hi Trip point. To minimize safety implications the other l I"Ti'l i monitor on the '3' channel ves failed up. scale in the safe direction l l34l i tringing un the "'3' Channel Half Scram" until the 'D' monitor was re- l I

AI paired. All other units te sted satisfactorily. 1 i>>4i I

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i,i>i[ the cause of the inocersble monitor ves a defective transistor in a G.I. ,

i..'#I Tris w.te vedel No. 194moco7. N emstseer was -esime d wo e'. t yl monitor returned to service in six hours. ,

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