ML19254E541

LER 79-045/03L-0:on 790924,E-2 Diesel Tripped,Causing Half Scram & Half Isolation.Caused by Erroneous Shutdown of Emergency Svc Water Sys & Subsequent Rise in Lube Oil Temp in Generator.Control Switch Tagged

ML19254E541
Person / Time
Site:	Peach Bottom
Issue date:	10/24/1979
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19254E537	List: 05000277/LER-1979-045, Forwards LER 79-045/03L-0 05000277/LER-1979-045-03, /03L-0:on 790924,E-2 Diesel Tripped,Causing Half Scram & Half Isolation.Caused by Erroneous Shutdown of Emergency Svc Water Sys & Subsequent Rise in Lube Oil Temp in Generator.Control Switch Tagged
References
LER-79-045-03L, LER-79-45-3L, NUDOCS 7911010449
Download: ML19254E541 (1)

Text

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G1 NUMUEit EVENT DESCRIPTION AND PROOABLE CONSEQUENCLS o 2 { With one of f-site power source out of service for maintenance and the I

,, 3 l E-2 diesel supplyinr; loads on the E-22 emergency bus, the E-2 diesel I o 4 l tripped causing a half scram and half isolation of Unit 2. The E-22 bus I

. s was immediately re-energized from the remaining off-site power source. 1 i Til I within 30 minutes the E-p'ienel was back on supplying _E-22 bus loads. 1 o i [ Because continued operation was pe_rmissible in accordance with limitinr I o H t conditions for operation TS 3,9.B.4, the sa fety sinnificance is minimal. I uo 80 SYSTE M CAUSE CAust CCMP. VALVE CODE C C,DE SUdCOOL COWONL NT CODE SU0 CODE SUSCODE o o I ElE ]@ A j @ l A l @ l Z l Z l Z l Z l Z l Z l8 LZJ @ I z l @

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CAUSE DE5cR1PTION AND CORRECTIVE ACTIOT.S i o l While removing the E-3 diesel from service, an operator erroneous 1v 1 i 1 I shutdown the emergency service water svstem. The subsecuent -iso in Me I i ,

[ oil temperature on the operating E-2 diesel caused it to trie. Systems I ig l were promptly restored to service. Control switch tanninc and orerator l 40l instruction were completed to prevent recurrence. I

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