ENS 55808
ENS Event | |
|---|---|
05:00 Jun 22, 2021 | |
| Title | Part 21 - Poppet Seal Failure |
| Event Description | The following information was provided by the licensee via fax or email:
This is a non-emergency notification required by 10 CFR 21.21(d)(3)(i). A written notification in accordance with 10 CFR 21.21(d)(3)(ii) will be provided within 30 days. On June 22, 2021, VC Summer Nuclear Station (VCSNS) received information indicating that a poppet seal failure in the Feedwater Isolation Valve (FWIV) 'B' control block was due to laminations in the Viton material. The failure occurred on May 12, 2021 and was captured in the corrective action program as CR-21-01263. VCSNS completed a Substantial Safety Hazard Evaluation and determined that the laminations in VCSNS poppet seal lots 7064051 and 7081558 constituted a substantial safety hazard. The FWIV poppet seals are responsible for retaining and directing pressurized air to each side of the FWIV actuator for repositioning and maintaining FWIV position in both the open and closed positions. The NRC Senior Resident Inspector has been notified. |
| Where | |
|---|---|
| Summer South Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
| Time - Person (Reporting Time:+6748.72 h281.197 days <br />40.171 weeks <br />9.244 months <br />) | |
| Opened: | Justin Bouknight 09:43 Mar 30, 2022 |
| NRC Officer: | Brian Lin |
| Last Updated: | Mar 30, 2022 |
| 55808 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 566122023-05-11T16:50:00011 May 2023 16:50:00
[Table view]10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - CAP Screw Improper Length ENS 569192021-11-12T05:00:00012 November 2021 05:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - EATON-CUTLER Hammer Relay on Emergency Diesel Failed ENS 558082021-06-22T05:00:00022 June 2021 05:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Poppet Seal Failure ENS 569202021-05-05T05:00:0005 May 2021 05:00:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Gould Field Flash Relay on Emergency Diesel Failed 2023-05-11T16:50:00 | |