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Forwards LERs 86-071-00,86-072-00 & 86-073-00.

Accession Number: ML20214J302

Date Released: Saturday, August 15, 2020

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• ML20214J298 - Forwards LERs 86-071-00,86-072-00 & 86-073-00. (1 page(s), 11/21/1986)
• ML20214J329 - LER 86-071-00:on 861024,transfer of reactor protection sys bus A from normal power supply to alternate supply resulted in unexpected balance-of-plant isolation.Caused by inadequate procedure.Sys operating instruction revised. (3 page(s), 11/21/1986)
• ML20214J443 - LER 86-072-00:on 861025,28 & 29,reactor protection sys alternate power supply tripped,causing nuclear steam supply shutoff sys outboard isolation.Caused by design deficiency. Regulating transformers will be installed. (3 page(s), 11/21/1986)
• ML20214J454 - LER 86-073-00:on 861025,both trains of control room ventilation (HVAC) sys shifted into emergency recirculation mode & standby train of annulus exhaust gas treatment sys started.Caused by inadequate procedure.Instructions revised. (3 page(s), 11/21/1986)