ML19261F331

RO 77-15/3L:on 770529,one of Two Units of 230/4.16 Kv Auxiliary Transformer de-energized,leading to Operation in Degraded Mode Permitted by Tech Spec 3.7.2.b.Caused by Wiring Error on Current Transformers.Sys Repaired.Ler Encl

Date released: 10/02/2019	Download: ML19261F331

LER 77-015/03L:on 770529,during Normal operation,230 Kv Substation Bus 4 Was de-energized by Differential Relay 87BB-1.Caused by Wiring Error on Auxiliary Transformer Due to Drawing Error.Bus & Transformer Returned to Svc

ML19261F332
Person / Time
Site:	Three Mile Island
Issue date:	06/28/1977
From:	Potts W METROPOLITAN EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
Download: ML19261F332 (1)

RO 77-15/3L:on 770529,one of Two Units of 230/4.16 Kv Auxiliary Transformer de-energized,leading to Operation in Degraded Mode Permitted by Tech Spec 3.7.2.b.Caused by Wiring Error on Current Transformers.Sys Repaired.Ler Encl

ML19261F330
Person / Time
Site:	Three Mile Island
Issue date:	06/28/1977
From:	Herbein J METROPOLITAN EDISON CO.
To:
References
Download: ML19261F330 (4)