ENS Event | |
|---|---|
08:40 Oct 26, 2014 | |
| Title | 60-Day Optional Telephone Notification of Invalid Actuation of Residual Heat Removal Pump |
| Event Description | This 60-day telephone notification is being made under reporting requirements specified by 10 CFR 50.73(a)(2)(iv)(A) and 10 CFR 50.73(a)(1) to describe an invalid actuation of the Unit 1 11 RHR Pump while Unit 1 was at NO MODE. It was a complete actuation. This was not the result of a preplanned sequence during testing and the system was not removed from service.
At 0340 CDT on October 26, 2014, the Unit 1 11 RHR Pump was noted to have started while investigating an NSSS [nuclear steam supply system] annunciator system ground. The operator verified that the pump had adequate suction path via the RCS Cold Leg and stable pump discharge pressure. The 11 RHR Pump was stopped per the plant's abnormal operating procedure. Evaluation of this event has shown that the auto-start of 11 RHR pump was due to a human performance error while performing relay replacements. Following troubleshooting of the auto-start and completion of the relay maintenance, the 11 RHR pump was run; the pump and system operated properly. The health and safety of the public was not affected by this issue. The licensee has notified the NRC Resident Inspector. |
| Where | |
|---|---|
Prairie Island  Minnesota (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation Other Unspec Reqmnt | |
| Time - Person (Reporting Time:+1395.33 h58.139 days <br />8.306 weeks <br />1.911 months <br />) | |
| Opened: | Mark Loosbrock 13:00 Dec 23, 2014 |
| NRC Officer: | Howie Crouch |
| Last Updated: | Dec 23, 2014 |
| 50702 - NRC Website
Loading map... | |
WEEKMONTHYEARENS 582102026-01-26T19:43:00026 January 2026 19:43:00
[Table view]10 CFR 50.73(a)(1), Submit an LER Invalid System Actuation ENS 531352017-10-26T01:50:00026 October 2017 01:50:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Cooling Water System ENS 531342017-10-23T13:56:00023 October 2017 13:56:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Emergency Diesel Generator ENS 507022014-10-26T08:40:00026 October 2014 08:40:00 Other Unspec Reqmnt, 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephone Notification of Invalid Actuation of Residual Heat Removal Pump ENS 438342007-10-15T20:02:00015 October 2007 20:02:00 10 CFR 50.73(a)(1), Submit an LER Inadvertent Start of Emergency Diesel Generator D2 2026-01-26T19:43:00 | |