ENS Event | |
|---|---|
20:04 Oct 28, 2010 | |
| Title | Invalid Actuation of the "B" Emergency Service Water (Esw) Pump |
| Event Description | Text provided by the licensee. Quotations omitted for readability.
Report Type: This 60-day telephone notification is being made under 10 CFR 50.73(a)(2)(iv)(A) and 10 CFR 50.73(a)(1). Description: On October 28, 2010, during the performance of MST I0073, "Train 'B' 18 Month Manual Reactor Trip, Solid State Protection System Actuation Logic & Master Relay Test", two sequential errors resulted in the inappropriate activation of the 'B' ESW pump. During night shift on October 27/28th, the Master Relay Selector Switch was not returned to the required OFF position. This caused day shift to find one of the two general warning lights to be lit. During the troubleshooting for the light, a technician discovered the Master Relay Selector Switch out of the expected OFF position as required by the procedure. A technician moved the switch to the OFF position outside of procedural guidance, resulting in the partial activation of the Reactor Protection System, including the 'B' ESW pump. The plant was in Mode 6 due to refueling outage 16 during the event. Actual plant conditions and parameters did not exist that required an automatic start of the 'B' ESW Pump. Therefore, this actuation is classified as invalid. The system started and functioned successfully. This invalid actuation was entered into the corrective action program as NCR 430289. Cause: Poor performance of task by the individual. The licensee informed the NRC Resident Inspector. |
| Where | |
|---|---|
Harris  North Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+979.78 h40.824 days <br />5.832 weeks <br />1.342 months <br />) | |
| Opened: | Kimberly Bass 16:51 Dec 8, 2010 |
| NRC Officer: | Steve Sandin |
| Last Updated: | Dec 8, 2010 |
| 46467 - NRC Website
Loading map... | |
WEEKMONTHYEARENS 580872025-10-21T15:01:00021 October 2025 15:01:00
[Table view]10 CFR 50.73(a)(1), Submit an LER Invalid Specified System Actuation ENS 471712011-06-21T17:08:00021 June 2011 17:08:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification of Invalid Specified System Actuation ENS 464352010-11-10T05:24:00010 November 2010 05:24:00 10 CFR 50.73(a)(1), Submit an LER Telephone Notification in Lieu of Written Ler - Invalid Actuation of Motor Driven Auxiliary Feedwater Pump ENS 464672010-10-28T20:04:00028 October 2010 20:04:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of the "B" Emergency Service Water (Esw) Pump ENS 458382010-02-16T15:22:00016 February 2010 15:22:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of a Motor Driven Auxiliary Feedwater Pump 2025-10-21T15:01:00 | |