ENS 53002
ENS Event | |
|---|---|
04:00 Oct 6, 2017 | |
| Title | Part 21 Interim Report - Switch with Unacceptable Chatter |
| Event Description | The following information is excerpted from a report received via email:
Seismic qualification testing revealed contact block (CB) chatter greater than 2 milliseconds (msec) contrary to the acceptance requirements of the seismic test procedure developed for the activity. This switch has not been provided to the customer, however, a second suspect switch with a similar configuration and parts is installed in the customer's facility. The condition is isolated to when OT2A CBs are configured in an alternating Normally Open (NO) / Normally Closed or Normally Closed (NC) / Normally Open (NO) arrangement. The CBs do not exhibit chatter when 3 or less CBs are configured this way. The chatter is not exhibited when configured in a NO/NC, NO/NC, configuration. When the fourth CB is added to the switch assembly in an alternating configuration is when the contact chatter exceeds greater than 2 msec. Paragon Engineering has requested TVA Engineering to provide a reduced spectra specific to the installed location for further evaluation. Paragon Engineering has not been able to complete this activity within the 60-day period allowed under 10 CFR 21. One suspect switch has been provided to and installed at the customer's facility. The customer's facility is TVA - Watts Bar Unit 2.
The following is an excerpt from the final Part 21 report received via email: Paragon ES [Energy Solutions] successfully completed qualification of a seismic specimen to the originally provided spectra using older vintage contact blocks. A reduced response spectra was requested from the licensee to verify that this condition did not present a substantial safety hazard for the existing installed switch. The licensee alternatively completed an evaluation of the condition and determined a substantial safety hazard did not exist. Notified R2DO (Blamey) and Part 21 Reactors Group via email. |
| Where | |
|---|---|
| Paragon Energy Solutions Oak Ridge, Tennessee (NRC Region 1) | |
| Organization: | Paragon Energy Solutions |
| Reporting | |
| 10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component | |
| Time - Person (Reporting Time:+11.48 h0.478 days <br />0.0683 weeks <br />0.0157 months <br />) | |
| Opened: | Ray Chalifoux 15:29 Oct 6, 2017 |
| NRC Officer: | Donald Norwood |
| Last Updated: | Nov 29, 2017 |
| 53002 - NRC Website | |
Paragon Energy Solutions with 10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component | |
WEEKMONTHYEARENS 570792024-02-15T05:00:00015 February 2024 05:00:00
[Table view]10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component Initial Part 21 Report - Potential Defect with Circuit Breaker ENS 566532023-08-03T00:00:0003 August 2023 00:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect, 10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component Initial Part 21 Report - Defect with Eaton/Cutler Hammer Size 4 and 5 Freedom Series Contactors ENS 565572023-04-05T04:00:0005 April 2023 04:00:00 10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component Part 21 - Relay Card Potential Defect ENS 551622021-03-30T21:50:00030 March 2021 21:50:00 10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component Part 21 - Failure of Size 1 and 2 Freedom Series Fvr Starters ENS 530022017-10-06T04:00:0006 October 2017 04:00:00 10 CFR 21.21(a)(2), Interim Report for Comply or Defect in Component Part 21 Interim Report - Switch with Unacceptable Chatter 2024-02-15T05:00:00 | |