ML19254F930

LER 78-014/03L-0:on 780626,at Power Operation,Shutoff Valve on Pressure Switch Found Closed.Caused by Closure During 780621 Testing.Valve Reopened & Valving for Safety Instrumentation Checked

ML19254F930
Person / Time
Site:	Peach Bottom
Issue date:	07/18/1978
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
LER-78-014-03L, LER-78-14-3L, NUDOCS 7911190470
Download: ML19254F930 (1)

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. Mr. Soyce A. Grier, Director No. 3*78 ol4/3L i' Office of Inspection & Enforcement, Region I U.S. Nuclear Regulatory Comission 631 Park Avenue King of Prussia, PA 19406

Dear Mr. Grier:

This LER refers to the discovery that a pressure switch, which is part of the reactor protection system, was vlaved out of service. Technical Specification Tables,1.1.1 and 3 2.A require 2 operable channels per trip system.

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EVENT ossemirtiom ano encsasta coNsEQl.,ENCEs h o a l While at oo er operation, during testing of an adjacent instrument, the o l shutoff valve on pressure switch PS 3-5-120 was found closed. This l o . l switch provides one of the inputs into a one out of two twice logic for f o s I high drywell oressure scram and Primary Containnent Isolation system l o e 1 initiation. Redundant pressure switches were ooerable therefore safety I

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