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Depending on the particular combination of damage to the bleed-off resistors, transient suppression resistors, contacts and capacitor bank in each unit, electrical transients of various amplitudes can be generated and transmitted directly to the generator. If the transient is sufficiently high and is sent enough times, a pinhole can be created in the winding dielectric, causing a short circuit. Once a short circuit forms, the generator’s performance degrades until general failure occurs. In shorting to the grounded casing, the generator rotor develops a thrust that damages the bearings as observed. Unfortunately, because damage to their circuit components didn't prevent the turbines from running, no operating effect was noticeable until failure occurred. Follow-up Based on these findings, a maintenance intervention program to regularly inspect and replace transient suppression components was initiated. Unexpected failures stopped, and the cross-disciplinary investigation team was disbanded. What started with questions about the generators' lubricants and bearings ended with sound conclusions regarding the actual problem: the units' circuit components. MT Randy Noon is a Root Cause Team Leader at Nebraska’s Cooper Nuclear Station. A noted author and frequent contributor to MT, he’s been investigating failures for more three decades. Email: rknoon@nppd.com.
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MAINTENANCE TECHNOLOGY
C: 60 M: 0
SEPTEMBER 2013