ENS Event | |
|---|---|
10:49 Feb 12, 2026 | |
| Title | Manual Reactor Trip Due to a Loss of Both Reactor Recirculation Pumps |
| Event Description | The following information was provided by the licensee via phone and email:
At 0249 PST, on February 12, 2026, with the unit in Mode 1 at 100 percent power, the reactor was manually tripped due to a loss of both reactor recirculation pumps because of abnormal pump drive parameters. Following reset of the reactor trip signal, operators observed erratic automatic operation of the reactor feed pumps with an associated reactor water level transient to less than plus 13 inches resulting in an additional reactor trip signal. Operators took manual control of the reactor feed pumps and recovered reactor water level, stabilizing water level at above plus 13 inches. The reactor trip signal was reset, and reactor water level was raised to support natural circulation flow of the reactor. Decay heat is being removed via natural circulation in the reactor with steam to the main condenser. Due to the valid reactor protection system actuations, this event is being reported as a four-hour, non-emergency notification per 10 CFR 50.72(b)(2)(i), four-hour, non-emergency notification per 10 CFR 50.72(b)(2)(iv)(B), and eight-hour, non-emergency notification, per 10 CFR 50.72(b)(3)(iv)(A). There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified. |
| Where | |
|---|---|
Columbia  Washington (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
| Time - Person (Reporting Time:+-1.4 h-0.0583 days <br />-0.00833 weeks <br />-0.00192 months <br />) | |
| Opened: | Zachary Dunham 09:25 Feb 12, 2026 |
| NRC Officer: | Jon Lilliendahl |
| Last Updated: | Feb 12, 2026 |
| 58163 - NRC Website
Loading map... | |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | Yes, Manual Scram |
| Before | Power Operation (100 %) |
| After | Hot Shutdown (0 %) |
WEEKMONTHYEARENS 581632026-02-12T10:49:00012 February 2026 10:49:00
[Table view]10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Manual Reactor Trip Due to a Loss of Both Reactor Recirculation Pumps ENS 576632025-04-12T09:23:00012 April 2025 09:23:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Shutdown Required by Technical Specifications ENS 432912007-04-09T05:32:0009 April 2007 05:32:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown 2026-02-12T10:49:00 | |