05000278/LER-1982-005

LER 82-005/03L-0:on 820514,during Normal Operation,Reactor Operator Heard Relay in Primary Containment Isolation Sys Energize.Caused by Defective Component in Rosemount Model 510DU Slave Trip Unit.Instrument Replaced

ML20054J374
Person / Time
Site:	Peach Bottom
Issue date:	06/14/1982
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
LER-82-005-03L-01, LER-82-5-3L-1, NUDOCS 8206280551
Download: ML20054J374 (1)

LER-2082-005,

Event date:
Report date:
2782082005R00 - NRC Website

text

Mr. E. C. Haynes No. 3-82-05/03L-0 l Ad mit. i s t r a t o r U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406

Dear Mr. Haynes:

This*LER' deals with the failure of the Rosemount Slave Trip Unit which activates the 600 psig trip in the Primary Containment Isolation System (PCIS) govemed by Tech. Spec. Table No. 3 7.1 U. a. NUCLE AR REGULATORv COededissioN LICENSEE EVENT REPORT coNTmotstocnfl . l l l l l .l@ (PosAss eniNT on Tves ALL atousato sNeonenAfiom

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EVENT DESCRIPTION AND PMotASLE coNstoutNets h o l During normal operation, reactor operator heard a relay in the l gl PCIS energize. Later, during investination a similar event occurred I o . l confirming suspicions of a faulty trin unit. The instrument is I o s l part of the 1 out of 2 twice permissive loeic to operat e the I

@l feedwater flush valves'. All redundant instrument chnnnels remained I o

• I tripped and operator action is reautred to encrate the valves- 1 Mt

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4J 43 e4 41 CAust DESCRIPTION AND CoRRICTIVE actions 27 8l Investination revealed the Rosemount *4o d e l ! 51o00 Slave Trin Unit I i i i to have a defective component. The instrument was rentne A I gl recalibrated and tested for operability. l 1

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