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The following was received via FAX:
On May … The following was received via FAX:</br>On May 18, 2016, Nuclear Logistics INC. (NLI) determined that a contactor failure that occurred at the Shearon Harris plant had failed due to an auxiliary contact chatter present on the seal-in circuit for the coil voltage. The auxiliary contact chatter was caused by the loss of the shading </br>coils. NLI will be submitting a full report on the issue to the NRC within 60 days.</br>The contactor that failed was a Size 4 Eaton Freedom Series with a special coil for degraded voltage condition.</br>Reference Number: P21-05192016</br>NLI reported that the following plants have these types of contactor's:</br>Region 2: Oconee, Turkey Point, Shearon Harris and North Anna</br>Region 4: Columbia and Waterford</br>* * * UPDATE AT 1832 EDT ON 06/20/16 FROM TRACY BOLT TO DANIEL MILLS * * * </br>The following is excerpted from the licensee submission:</br>The specific part which fails to comply or contains a defect: The Contactor that failed in service is a Size 4 Eaton Freedom Series with an AZZ/NLI special coil for meeting specific degraded voltage conditions.</br>Extent of condition: Size 3, 4 and size 5 Eaton Freedom Series contactors or starters with an NLI special degraded voltage coil that have been supplied by AZZ/NLI since December 2010.</br>NLI procured the commercial grade contactors and installed the special coil that was required to achieve the specific degraded voltage condition. The units were qualified, dedicated and supplied for safety related applications. The contactors were commercially procured from Eaton, the Original Equipment Manufacturer (OEM).</br>For contactors/starters utilized in continuous duty applications. the OEM shading coils on the contactor core ... have the potential to become loose and fall off. If the shading coils are not in the intended location on the core, there is the potential for excessive chatter to occur on the normally open auxiliary contacts that are closed when the contactor is energized.</br>The safety function of the contactor is to reliably supply uninterrupted power (no contact chatter) to a load on demand. For special degraded voltage applications, the NLI supplied contactor is equipped with an NLI special coil that replaces the OEM coil.</br>When the contactor/starters that have the special coil installed are utilized in a continuous duty operation (continuously energized greater than 60 minutes) the special coil reaches a higher temperature than the original manufacturer's coil. The increased heat is potentially causing degradation of the acrylic resin that is utilized by the manufacturer to hold the OEM shading coils onto the OEM core. After the acrylic resin is no longer providing a secure hold on the shading coils, the shading coils can then become loose from the iron core. </br>Name and address of the individual or individuals informing the Commission.</br>Tracy Bolt, Director of Quality Assurance</br>Nuclear Logistics, Inc.</br>7410 Pebble Drive</br>Ft. Worth, TX 76118</br>AZZ/NLI Part 21 Report No: P21-05192016, Rev. 0 </br>Plants potentially impacted include Oconee, Shearon Harris, Columbia, Turkey Point, North Anna, and Waterford.</br>Notified R4DO (Rollins), R2DO (Musser) and Part 21/50.55 Reactors group (via email). Part 21/50.55 Reactors group (via email).
05:00:00, 18 May 2016 +
19:17:00, 19 May 2016 +
05:00:00, 18 May 2016 +
The following was received via FAX:
On May … The following was received via FAX:</br>On May 18, 2016, Nuclear Logistics INC. (NLI) determined that a contactor failure that occurred at the Shearon Harris plant had failed due to an auxiliary contact chatter present on the seal-in circuit for the coil voltage. The auxiliary contact chatter was caused by the loss of the shading </br>coils. NLI will be submitting a full report on the issue to the NRC within 60 days.</br>The contactor that failed was a Size 4 Eaton Freedom Series with a special coil for degraded voltage condition.</br>Reference Number: P21-05192016</br>NLI reported that the following plants have these types of contactor's:</br>Region 2: Oconee, Turkey Point, Shearon Harris and North Anna</br>Region 4: Columbia and Waterford</br>* * * UPDATE AT 1832 EDT ON 06/20/16 FROM TRACY BOLT TO DANIEL MILLS * * * </br>The following is excerpted from the licensee submission:</br>The specific part which fails to comply or contains a defect: The Contactor that failed in service is a Size 4 Eaton Freedom Series with an AZZ/NLI special coil for meeting specific degraded voltage conditions.</br>Extent of condition: Size 3, 4 and size 5 Eaton Freedom Series contactors or starters with an NLI special degraded voltage coil that have been supplied by AZZ/NLI since December 2010.</br>NLI procured the commercial grade contactors and installed the special coil that was required to achieve the specific degraded voltage condition. The units were qualified, dedicated and supplied for safety related applications. The contactors were commercially procured from Eaton, the Original Equipment Manufacturer (OEM).</br>For contactors/starters utilized in continuous duty applications. the OEM shading coils on the contactor core ... have the potential to become loose and fall off. If the shading coils are not in the intended location on the core, there is the potential for excessive chatter to occur on the normally open auxiliary contacts that are closed when the contactor is energized.</br>The safety function of the contactor is to reliably supply uninterrupted power (no contact chatter) to a load on demand. For special degraded voltage applications, the NLI supplied contactor is equipped with an NLI special coil that replaces the OEM coil.</br>When the contactor/starters that have the special coil installed are utilized in a continuous duty operation (continuously energized greater than 60 minutes) the special coil reaches a higher temperature than the original manufacturer's coil. The increased heat is potentially causing degradation of the acrylic resin that is utilized by the manufacturer to hold the OEM shading coils onto the OEM core. After the acrylic resin is no longer providing a secure hold on the shading coils, the shading coils can then become loose from the iron core. </br>Name and address of the individual or individuals informing the Commission.</br>Tracy Bolt, Director of Quality Assurance</br>Nuclear Logistics, Inc.</br>7410 Pebble Drive</br>Ft. Worth, TX 76118</br>AZZ/NLI Part 21 Report No: P21-05192016, Rev. 0 </br>Plants potentially impacted include Oconee, Shearon Harris, Columbia, Turkey Point, North Anna, and Waterford.</br>Notified R4DO (Rollins), R2DO (Musser) and Part 21/50.55 Reactors group (via email). Part 21/50.55 Reactors group (via email).
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