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Forwards LER 91-017-01.Suppl issued to provide root causes for two missed TS requirements & results of root cause investigation for phase B main transformer failure on 910813.

Accession Number: ML17056B949

Date Released: Thursday, June 29, 2017

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• ML17056B948 - Forwards LER 91-017-01.Suppl issued to provide root causes for two missed TS requirements & results of root cause investigation for phase B main transformer failure on 910813. (4 page(s), 8/13/1992)
• ML17056B950 - LER 91-017-01:on 910813,turbine trip & reactor trip experienced when Phase B main transformer developed internal fault,resulting in loss of uninterruptible power supplies. Caused by failure of coil insulation.Transformer removed. (46 page(s), 8/13/1992)