ENS 41888: Difference between revisions
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| event date = 08/02/2005 18:00 EDT | | event date = 08/02/2005 18:00 EDT | ||
| last update date = 08/02/2005 | | last update date = 08/02/2005 | ||
| title = Potential Part 21 Issue | | title = Potential Part 21 Issue with Struthers-Dunn Relays | ||
| event text = On 8/21/2005 Duke Energy Corporation was informed by the manufacturer of Struthers-Dunn relay, part number 219BBXP, of a manufacturing defect with the subject relay. Duke contacted the manufacturer as follow up to recent relay failures of this type. There has not been a Part 21 notification to date. The defect is in the relay coil. Some coils that were made in China over an approximate 18-month period did not have their coil core annealed. The annealing step in the manufacturing process was apparently skipped. The missed annealing step results in the relay coil potentially drawing almost twice its rated current. As a result, the coil can fail after an extended period of time in the energized state. Potentially affected relays of this type were purchased commercial grade and dedicated by Duke Energy Corporation for use in safety related applications. This relay type is utilized in valves in the Catawba Nuclear Service Water System. An investigation is in progress as to whether the relays in service at Catawba have the date code to indicate they have the manufacturing defect. Duke is also investigating if this relay type is in service at the other Duke nuclear units. This manufacturing defect may be reportable under 10 CFR 21 if other utilities purchased identical relays and dedicated them for use in safety related applications. | | event text = On 8/21/2005 Duke Energy Corporation was informed by the manufacturer of Struthers-Dunn relay, part number 219BBXP, of a manufacturing defect with the subject relay. Duke contacted the manufacturer as follow up to recent relay failures of this type. There has not been a Part 21 notification to date. The defect is in the relay coil. Some coils that were made in China over an approximate 18-month period did not have their coil core annealed. The annealing step in the manufacturing process was apparently skipped. The missed annealing step results in the relay coil potentially drawing almost twice its rated current. As a result, the coil can fail after an extended period of time in the energized state. Potentially affected relays of this type were purchased commercial grade and dedicated by Duke Energy Corporation for use in safety related applications. This relay type is utilized in valves in the Catawba Nuclear Service Water System. An investigation is in progress as to whether the relays in service at Catawba have the date code to indicate they have the manufacturing defect. Duke is also investigating if this relay type is in service at the other Duke nuclear units. This manufacturing defect may be reportable under 10 CFR 21 if other utilities purchased identical relays and dedicated them for use in safety related applications. | ||
The following is a summary of information obtained from Struthers-Dunn concerning the affected relays: | The following is a summary of information obtained from Struthers-Dunn concerning the affected relays: | ||
Latest revision as of 22:20, 1 March 2018
| Where | |
|---|---|
Catawba  South Carolina (NRC Region 2) | |
| Reporting | |
| Other Unspec Reqmnt | |
| Time - Person (Reporting Time:+-0.28 h-0.0117 days <br />-0.00167 weeks <br />-3.83544e-4 months <br />) | |
| Opened: | David Johnson 21:43 Aug 2, 2005 |
| NRC Officer: | Jeff Rotton |
| Last Updated: | Aug 2, 2005 |
| 41888 - NRC Website
| |