ENS Event | |
|---|---|
01:23 Apr 2, 2021 | |
| Title | 60-Day Telephonic Notification of Invalid Plant Protection System Actuation Signal |
| Event Description | This 60-day telephone notification is being made in accordance with 10 CFR 50.73(a)(1) and 10 CFR 50.73(a)(2)(iv)(A) to provide information pertaining to an invalid Engineered Safety Feature actuation signal.
On April 1, 2021, at Waterford 3, while performing a replacement of power supplies on the Plant Protection System, a spurious signal caused a partial actuation of the Emergency Feedwater Actuation Signal. A partial Emergency Feedwater (EFW) logic trip path was met causing the opening of valves EFW-228A (EFW to SG 1 Primary Isolation), EFW-229A (EFW to SG 1 backup isolation), EFW-228B (EFW to SG 2 Primary Isolation), and EFW-229B (EFW to SG2 Backup Isolation). This inadvertent actuation was spurious and was not a valid signal resulting from parameter inputs. The 1992 Statements of Consideration (57 FR 41378) define an invalid signal to include spurious signals. Therefore, this actuation is considered invalid. This event was entered into the Waterford 3 corrective action program for resolution. This event did not result in any adverse impact to the health and safety of the public. The plant responded as expected. In accordance with 10 CFR 50.73(a)(1) a telephone notification is being made in lieu of submitting a written Licensee Event Report. The NRC Senior Resident Inspector has been notified. |
| Where | |
|---|---|
Waterford  Louisiana (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1351.68 h56.32 days <br />8.046 weeks <br />1.852 months <br />) | |
| Opened: | Jeffery Bradley 09:04 May 28, 2021 |
| NRC Officer: | Thomas Herrity |
| Last Updated: | May 28, 2021 |
| 55281 - NRC Website
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Unit 3 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Hot Standby (0 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 562022022-09-06T14:21:0006 September 2022 14:21:00
[Table view]10 CFR 50.73(a)(1), Submit an LER 60-DAY Optional Telephonic Notification of Invalid Engineered Safety Feature Actuation Signal ENS 552812021-04-02T01:23:0002 April 2021 01:23:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Telephonic Notification of Invalid Plant Protection System Actuation Signal ENS 542052019-06-25T22:13:00025 June 2019 22:13:00 10 CFR 50.73(a)(1), Submit an LER Invalid Engineered Safety Feature Actuation Signal Due to Human Error ENS 428602006-09-07T12:50:0007 September 2006 12:50:00 10 CFR 50.73(a)(1), Submit an LER Invalid System Actuation 2022-09-06T14:21:00 | |