ENS 55950

v t e ENS Event
05:00 Jun 16, 2022
Title	Part 21 Report - Failure of an Arnold Magnetics Power Supply
Event Description	The following is a synopsis of information received via facsimile: On June 16, 2022, vendor Nutherm International, Inc. was informed that a defect caused the failure of Arnold Magnetics power supply PBM-24-106. The unit had been supplied by Nutherm to a nuclear power plant. The unit failed on or before March 15, 2022 during a 24-hour burn in period and was returned to Nutherm which did an inspection and analysis. Nutherm then returned the unit to Arnold Magnetics, the manufacturer, which completed further analysis. The manufacturer determined the unit failed due to the EMI filter assembly not functioning as designed as a result of the manufacturer's assembler not installing no-mex paper and thus not in accordance with manufacturer's procedure. Both the manufacturer and Nutherm have initiated corrective actions to prevent recurrence. One facility is listed as being affected: TVA - Browns Ferry. Nutherm notified the affected facility on June 17, 2022. If you have any questions or wish to discuss this matter or this report, please contact: Adrienne Smith at adrienne.smith@nutherm.com or at (618) 244-6000 x3034.

ENS 55950 +/-
Where
Nutherm International, Inc Mount Vernon, Illinois (NRC Region 3)
Organization:	Nutherm International, Inc
Reporting

10 CFR 21.21(d)(3)(i), Failure to Comply or Defect
Time - Person (Reporting Time:+31.65 h1.319 days <br />0.188 weeks <br />0.0434 months <br />)
Opened:	Thomas A. Sterbis 12:39 Jun 17, 2022
NRC Officer:	Karl Diederich
Last Updated:	Jun 17, 2022
55950 - NRC Website
v • d • e

v t e Emergency Notification System
Nutherm International, Inc with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect
WEEKMONTHYEAR		Part 21 Report - Continuously Energized Eaton D26 Relays 2022-06-16T05:00:00 [Table view]
[ENS list for Nutherm International, Inc]

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