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| Start date | Reporting criterion | Title | Event description | System | LER | |
|---|---|---|---|---|---|---|
| ENS 56196 | 31 October 2022 05:00:00 | 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | Part 21 Report - Sola / HEVI-DUTY Uninterruptible Power Supply OUT-OF-SPECIFICATION | The following is a synopsis of information provided by Nutherm International via fax: Nutherm was notified by the customer that a Sola / Hevi-Duty uninterruptible power supply provided under an Exelon purchase order did not power up properly. The unit was returned to Nutherm for failure analysis. Inspection of the internals showed damage to transistors. When energized, the output was out of specification. This UPS had been supplied for use at Clinton Power Station. No other units are impacted by this defect or failure to comply. This issue has been identified as a single failure on this component only. This issue will not impact any future procurements. | ||
| ENS 51938 | 17 May 2016 05:00:00 | 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | Part 21 Report - Defect in a Signal Converter Transformer | 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. |