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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.

Accession Number: ML19261F331

Date Released: Wednesday, October 2, 2019

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• ML19261F330 - 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. (4 page(s), 6/28/1977)
• ML19261F332 - 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. (1 page(s), 6/28/1977)