ENS Event | |
|---|---|
22:13 Jun 25, 2019 | |
| Title | Invalid Engineered Safety Feature Actuation Signal Due to Human Error |
| 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 June 25, 2019, at Waterford 3, while performing an emergent replacement of relays on the Engineered Safety Features Actuation System Train A that affected Shield Building Ventilation Train A and HVAC Equipment Room Supply Fan AH-1 3A, unintentional contact was made between two contacts on the relay, resulting in an inadvertent initiation of other relays in the sequencer circuit. This caused the starting of Low Pressure Safety Injection Pump A, Switchgear Ventilation Fan A, and Boric Acid Makeup pumps. This was a partial actuation of Engineered Safety Features Actuation System Train A. Affected plant systems started and functioned successfully. This inadvertent actuation was caused by human error and was not a valid signal resulting from parameter inputs. The 1992 Statements of Consideration define an invalid signal to include human error. 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. 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:+1047.22 h43.634 days <br />6.233 weeks <br />1.434 months <br />) | |
| Opened: | Remy Devoe 13:26 Aug 8, 2019 |
| NRC Officer: | Caty Nolan |
| Last Updated: | Aug 8, 2019 |
| 54205 - NRC Website | |
Unit 3 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| 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 | |