ENS 54760: Difference between revisions
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| NRC officer = Brian Lin | | NRC officer = Brian Lin | ||
| event date = 06/01/2020 00:00 CDT | | event date = 06/01/2020 00:00 CDT | ||
| last update date = | | last update date = 07/21/2020 | ||
| title = | | title = En Revision Imported Date 7/22/2020 | ||
| event text = EN Revision Text: PART 21 - FAILURE OF SIZE 1 AND 2 FREEDOM SERIES AUXILIARY CONTACTS | |||
The following is a summary of information received from Paragon Energy Solutions: | |||
DUKE Harris Nuclear Plant (HNP) has identified instances where Size 1 and 2 Eaton Freedom Series starters have failed to function as expected in assemblies that were originally supplied by NLI. The auxiliary contacts have degraded prematurely and have failed to change state when the starter was energized which has affected indication and other controlling actions within the circuit. | DUKE Harris Nuclear Plant (HNP) has identified instances where Size 1 and 2 Eaton Freedom Series starters have failed to function as expected in assemblies that were originally supplied by NLI. The auxiliary contacts have degraded prematurely and have failed to change state when the starter was energized which has affected indication and other controlling actions within the circuit. | ||
The premature degradation of the auxiliary contacts with the old model NLI special coil, part number: 057018-COIL-1/2, has occurred on size 1 and 2 contactors that were continuously energized with significant run time after approximately 3 to 5 years of service time. HNP has provided information to manage the known degradation. The auxiliary contacts should be replaced at an increased frequency until new auxiliary contacts are installed along with the new design NLI special coil, part number: 057018-COIL-1/2-M. | The premature degradation of the auxiliary contacts with the old model NLI special coil, part number: 057018-COIL-1/2, has occurred on size 1 and 2 contactors that were continuously energized with significant run time after approximately 3 to 5 years of service time. HNP has provided information to manage the known degradation. The auxiliary contacts should be replaced at an increased frequency until new auxiliary contacts are installed along with the new design NLI special coil, part number: 057018-COIL-1/2-M. | ||
| Line 38: | Line 39: | ||
817-284-0077 | 817-284-0077 | ||
tbolt@paragones.com | tbolt@paragones.com | ||
| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2020/ | * * * UPDATE ON 7/21/20 AT 1241 EDT FROM TRACY BOLT TO ANDREW WAUGH * * * | ||
The following is the summary of an email received from Paragon Energy Solutions: | |||
The root cause of the degraded component is due to the increased voltage and the overall temperature of the starter coil at the elevated voltage. This elevated voltage and temperature has degraded the mechanism of the auxiliary contact operator to a point to which it has become separated from the parent component. | |||
Paragon/NLI has developed a new version of the special coil (part number: 057018-COIL-1/2-M) that operates at a lower temperature than the original special coil that is currently in use at HNP. When the new version of the special coil is subjected to the same voltages, the temperature is lower. | |||
The affected plants have been revised to: | |||
Sharon Harris | |||
Oconee | |||
Turkey Point | |||
Columbia | |||
North Anna | |||
Notified R1DO (Carfang), R2DO (Miller), R4DO (Drake), and Part 21 Reactors Group (email). | |||
| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2020/20200722en.html#en54760 | |||
}} | }} | ||
{{ENS-Nav}} | {{ENS-Nav}} | ||
Revision as of 07:30, 23 July 2020
| Where | |
|---|---|
| Paragon Energy Solutions Fort Worth, Texas (NRC Region 4) | |
| Organization: | Paragon Energy Solutions |
| Reporting | |
| 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
| Time - Person (Reporting Time:+708.68 h29.528 days <br />4.218 weeks <br />0.971 months <br />) | |
| Opened: | Tracy Bolt 17:41 Jun 30, 2020 |
| NRC Officer: | Brian Lin |
| Last Updated: | Jul 21, 2020 |
| 54760 - NRC Website | |