ENS 54206

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v t e ENS Event
22:19 Aug 5, 2019
Title	Part 21 Notification - Spectrum Technologies Control Power Transformer
Event Description	Pursuant to 10 CFR 21.21(d)(3)(i), this is a non-emergency notification by Energy Northwest concerning a defect on a control power transformer (CPT) resulting in a failed starter coil while in service at Columbia Generating Station. The defect was associated with a CPT provided by Spectrum Technologies (model Micron B150-2957-1). On June 14, 2019, a failure analysis was completed that determined that the failure of the coil occurred because the starter coil was exposed to chronic elevated temperatures. These elevated temperatures were caused by the associated control power transformer (CPT) secondary voltage being maintained outside the coil's rated voltage range. Previously on June 10, 2019, it was determined that the CPT installed in the Spectrum Technologies motor starter assembly did not meet procurement specifications resulting in a turns ratio that produced higher voltages on the motor starter coil than its rated voltage. This led to overheating and breakdown of the coil insulation that created a short between two windings. On August 5, 2019, Energy Northwest completed a Part 21 evaluation in accordance with 10 CFR 21.21(a)(1) and determined that this deviation could create a substantial safety hazard as defined in 10 CFR 21.3. The NRC Resident Inspector has been notified. The licensee has 14 Spectrum transformers that are continuously energized that could be affected. The one transformer that experienced the failure was out of service for maintenance at the time of discovery. Four other coils were inspected for extent of condition and no more failures were found.

ENS 54206 +/-
Where
Spectrum Technologies Richland, Washington (NRC Region 4)
Organization:	Columbia Generating Station
Reporting

10 CFR 21.21(d)(3)(i), Failure to Comply or Defect
Time - Person (Reporting Time:+66.73 h2.78 days <br />0.397 weeks <br />0.0914 months <br />)
Opened:	Don Gregoire 17:03 Aug 8, 2019
NRC Officer:	Caty Nolan
Last Updated:	Aug 8, 2019
54206 - NRC Website
v • d • e

v t e Emergency Notification System
Spectrum Technologies with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect
WEEKMONTHYEAR2019-08-05T22:19:00 [Table view]
[ENS list for Spectrum Technologies]

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ENS Notification