Semantic search
Jump to navigation
Jump to search
| Entered date | Event description | |
|---|---|---|
| ENS 54664 | 14 April 2020 07:55:00 | The following is a summary of information obtained from Schulz Electric via email report: During the time period of January 2014 through November 2015, Schulz Electric performed recoating on several vertical motor endbell bearing oil reservoirs. In November 2015, one of Schulz Electric's nuclear customers identified an issue with the adherence of the coatings. In January 2016, the same customer reported another motor which had indicated coating adherence issues. The lack of adequate adherence root cause was determined to be a contamination that was introduced to the oil reservoir surface through the use of a chemical chelating agent to remove rust from the endbells after cleaning. On March 12, 2020 the same customer contacted Schulz Electric again to identify that two more motors had been pulled from service for standard overhaul and the bearing oil reservoirs for both motors had degraded coatings as well. As such, Schulz Electric performed an extent of condition investigation and determined that there were additional customers for which Schulz Electric provided the bearing oil reservoir recoating. The loss of adhesion and flaking exposes the bearing oil reservoir to oil and allows oil migration into the base metal. Over time the safety related motors could degrade from the foreign material (flaking) concerns. The licensees affected are Hope Creek, North Anna, Hatch, Farley, Vogtle, Grand Gulf, and Columbia. Point of Contact: Charles Eldredge, Quality Assurance Manager at Schulz Electric, 30 Gando Drive, New Haven, CT 06513, Office Number (203) 859-7413 |