ENS 55079
ENS Event | |
|---|---|
14:46 Dec 1, 2020 | |
| Title | 60-DAY Optional Telephonic Notification of an Invalid Specified System Actuation |
| Event Description | This 60-day optional telephone notification is being made in lieu of an LER submittal, as allowed by 10 CFR 50.73(a)(1). This notification is made pursuant to the reporting requirements specified in 10 CFR 50.73(a)(2)(iv)(A) for an invalid actuation of one of the systems listed in 10 CFR 50.73(a)(2)(iv)(B).
At 0946 hrs on December 1, 2020, with unit 2 in Mode 5 at 0% power, an invalid actuation of the Emergency Diesel Generators (EDG) 'A' and 'B', 'A' Residual Heat Removal (RHR) Pump, 'A' Service Water Booster Pump (SWBP), and Auxiliary Feed Water (AFW) Pumps 'A' and 'B' occurred. The actuation was caused by a Safety Injection (SI) signal while installing simulations to support Reactor Safeguards testing. The SI signal occurred when two out of three logic was met for Low Pressurizer Pressure, which was caused by a high resistance connection to a test point from a loose test lead. All aligned equipment, 'A' and 'B' EDGs, 'A' RHR Pump, 'A' SWBP and 'A' and 'B' AFW Pumps, responded properly to the auto-start signal and the actuation was complete. The actuation was not initiated in response to actual plant conditions, it was not an intentional manual initiation, and there were no parameters satisfying the requirements for initiation of the system. Therefore, this event has been determined to be an invalid actuation. There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector was notified. |
| Where | |
|---|---|
Robinson  South Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1226.4 h51.1 days <br />7.3 weeks <br />1.68 months <br />) | |
| Opened: | Arence Gower 17:10 Jan 21, 2021 |
| NRC Officer: | Donald Norwood |
| Last Updated: | Jan 21, 2021 |
| 55079 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Power Operation (0 %) |
| After | Power Operation (0 %) |
WEEKMONTHYEARENS 550792020-12-01T14:46:0001 December 2020 14:46:00
[Table view]10 CFR 50.73(a)(1), Submit an LER 60-DAY Optional Telephonic Notification of an Invalid Specified System Actuation ENS 461272010-05-25T17:14:00025 May 2010 17:14:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Report for Inadvertent Safety Injection System Actuation ENS 434502007-05-02T03:39:0002 May 2007 03:39:00 10 CFR 50.73(a)(1), Submit an LER Invalid System Actuation ENS 420842005-08-31T22:05:00031 August 2005 22:05:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of an Emergency Diesel Generator 2020-12-01T14:46:00 | |