Talked to the senior: They basically had resistors needing adjustment for the particular duty...they shot themselves in the foot by not doing the pre use adjustment. They are other troubles with component. GE procures the motor from another vendor...
Dresden Nuclear Power Station, Unit 3 Renewed Facility Operating License Nos. DPR-25 NRG Docket No. 50-249
Subject: Licensee Event Report 249/2016-001-00, Alert Declared from Unit 3 HPCI Auxiliary Oil Pump Motor Fire
See, poor maintenance leads to a failure, then the new motor fails almost emediately. This is a repeated pattern throughout the industry…
Think about all the intermediaries the motor components are made from.
Why wasn’t there a LER written out for the 2015 event?
2016-001-00 -The Root Cause of the HPCI AOP motor failure is inadequate control of critical parameters when installing a DC shunt wound motor. The Failure Mechanism was high armature current with a stalled rotor. The Contributing Cause of the HPCI AOP motor failure is historical motor procurement evaluation standards were not rigorous enough.
Previous Occurrences:
In 2015, the U3 HPCI AOP motor failed during planned maintenance due to carbon dust buildup inside the motor as a result of inadequate cleaning and inspection of the motor and commutator.
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