ENS 52938
ENS Event | |
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05:00 Aug 29, 2017 | |
Title | Part 21 Report - Relay Failure Nutherm Model 700Dc |
Event Description | The following excerpted report was received via fax:
On the basis of our evaluation, it is determined that Nutherm lnternational, Inc. does not have sufficient information to determine if the subject condition would, or has, created a Substantial Safety Hazard or would have created a Technical Specification Safety Limit violation as it relates to the subject plant applications. On 8/28/2017 Cooper notified the NRC of a reportable condition under 10CFR Part 21. An Allen Bradley relay base model 700DC exhibited early failure after 133 hours0.00154 days <br />0.0369 hours <br />2.199074e-4 weeks <br />5.06065e-5 months <br /> of service. This relay, model 700DC, has been dedicated/qualified for multiple applications for various plants. The Allen Bradley 700DC series relay coil failed after 133 hours0.00154 days <br />0.0369 hours <br />2.199074e-4 weeks <br />5.06065e-5 months <br /> of service. This failure was determined by Cooper Nuclear Station to have been a component infant mortality likely caused by a manufacturing flaw that likely occurred due to a tensioning issue at the start of the coil wire winding process. Failure of the coil will result in failure of the relay, which could result in a safety hazard. Nutherm International, Inc. has concluded its review of all procurements of the 700DC series relays that use the coil in question and have found forty-nine (49) units shipped to customers which could potentially have this defect: Nebraska Public Power Cooper Nuclear Station and Indiana Michigan Power Company Donald C. Cook Nuclear Plant. Initial actions of determining the units affected were completed 8/30/2017. The impacted customers were notified of this condition 8/30/2017. Nutherm International, Inc. does not have sufficient information to determine this condition would, or has, created a Substantial Safety Hazard or would have created a Technical Specification Safety Limit violation as it relates to the subject plant applications. Nutherm has no current orders for these units and has no units in stock. No further actions will be taken at this time. This issue has been identified as a 'component infant mortality' failure caused by a manufacturing flaw. The manufacturing flaw appears to be a random failure and was identified by Cooper Nuclear Station as likely to have occurred due to a tensioning issue at the start of the coil wire winding process. Failure of the coil would be expected to occur within a few days of operation. The units that have been installed and in operation for more than two months could be considered to not contain this random manufacturing flaw. Point of Contact: Thomas Sterbis - 618-244-6000 See also NRC event: 52934 |
Where | |
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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:+30.55 h1.273 days <br />0.182 weeks <br />0.0418 months <br />) | |
Opened: | Thomas Sterbis 11:33 Aug 30, 2017 |
NRC Officer: | Mark Abramovitz |
Last Updated: | Aug 30, 2017 |
52938 - NRC Website | |
Nutherm International, Inc with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | ||
WEEKMONTHYEARENS 559502022-06-16T05:00:00016 June 2022 05:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 Report - Failure of an Arnold Magnetics Power Supply ENS 549142020-09-25T05:00:00025 September 2020 05:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | Part 21 Report - Continuously Energized Eaton D26 Relays ENS 529382017-08-29T05:00:00029 August 2017 05:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 Report - Relay Failure Nutherm Model 700Dc ENS 516122015-12-18T06:00:00018 December 2015 06:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Potential Part 21 Involving Rtd Transmitter ENS 511232015-06-04T05:00:0004 June 2015 05:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Potential Failure of a Time Relay 2022-06-16T05:00:00 [Table view] | |