ML19225B264

LER 79-017/03L-0 on 790615:while Reactor Subcritical,D Main Steam Line Radiation Monitor Hi-Hi Trip Failed.Caused by Dirty Trip Relay or Dirty Test Switch Contacts. Condition Corrected by Repeated Testing

ML19225B264
Person / Time
Site:	Peach Bottom
Issue date:	07/09/1979
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
LER-79-017-031, LER-79-17-31, NUDOCS 7907240386
Download: ML19225B264 (2)

Text

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@l 0171 Ol 9l 7 l 980 lh 74 75 REPORT DATE 60 EVENT DESCRIPTION AND PRO 8 ABLE CONSEQUENCES h IO I2I l uirh rhn reactor suberitical and less than 212 F, the "D" main steam l 10131 liinn radiation monitor hi-hi trip failed to function during performance O 4 lof a routine surveillance test. The inoperable channel aas immediately l I O l 5 l lplaced_in a tripped condition. The sa fety sinnificance was minimal since 1 6 lredundant_ channels unre_ operable. 1 10171 1 i O 8 l l

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS I

i O The radiation monitor was retested and the hi-hL: rip functioned proper l ,

11 11 I l Iv. The orobable cause of the failure was either di rty trip relay or  !

E B l dirty test switch contracts since several operatiens of the relay and l I i I 3 I I switch ;orrected this condition. The surveillance test wa s performed l Il l' I Ldaily for six days to assure proner oneration of the trip circuit. 80 7 8 9 STA S  % POWE R OTHER STATUS ISCOV RY DISCOVERY DESCRIPTION fI- [Hjh lO l 0 l 0 l@! N/A l [B_jh[ Surveillance Test l ACTIVITY CONTENT RE L E asE D oF PE LE ASE AMOUNT OF ACTIVITY LOC ATION OF RE LEASE l i l 6 l {_7J @ [yjgl N/A l [_F/A 45 80 l }

7 8 9 10 11 44 PE RSONNE L E XPOSUR E S NUMBER TYPE D E SCRIPTION l

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• NRC USE ONLY

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NAME OF PREPARER

• W PHONE-C ,

7 907240 8b

Mr. Boyce H. Grier, Director No. 3 17/03L-0

%4fgce of Inspection & Enforcement, Region 1 3.S. Nuclear Regulatory Conrnission i 631 Park Avenue '

King of Prussia, PA 19406

Dear Mr. Grier:

This LER refers to failure of a main steam line radiation monitor. The governing Technical Specification is Table 3.1.1.

U. S. NUCLE AR REGULATORY COMMISSION i

LICENSEE EVENT REPORT j 368 21 %

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