ENS 51938

v t e ENS Event
05:00 May 17, 2016
Title	Part 21 Report - Defect in a Signal Converter Transformer
Event Description	The following report was received from the manufacturer via fax: Nutherm International, Inc. reported on a defect found in "Moore Industries SCT Signal Converter (Part Number SCT/4-20MA/10-50MA/117VAC/UB) based upon the failure analysis of a failed component. The conclusion was that the wire insulation in T2 transformer was damaged by the transformer manufacturing facility during assembly. This damage reduced the insulation resistance and dielectric breakdown between the windings of the transformer. These damaged transformers were subsequently installed by Moore Industries into the signal converters. The failure of the transformer resulted in early, catastrophic failure of the signal converter. Moore Industries tested the transformers remaining in stock and found one (1) of the remaining two-hundred nineteen (219) transformers exhibited this condition. In all documented cases involving failure of this transformer, the impacted units had passed pre-installation functional testing but failed within four months after installation. Affected nuclear power stations include: Peach Bottom Atomic Power Station and the Sequoyah Nuclear Station.

ENS 51938 +/-
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:+10.85 h0.452 days <br />0.0646 weeks <br />0.0149 months <br />)
Opened:	Thomas Sterbis 15:51 May 17, 2016
NRC Officer:	Karl Diederich
Last Updated:	May 17, 2016
51938 - 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
WEEKMONTHYEAR2022-10-31T05:00:00 [Table view]
[ENS list for Nutherm International, Inc.]

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