ENS 58163: Difference between revisions

ENS 58163 +/-
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...
	v • d • e

Latest revision as of 20:24, 20 February 2026

@@ Line 23: / Line 23: @@
 There was no impact on the health and safety of the public or plant personnel.
 The NRC Resident Inspector has been notified.
-| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260213en.html#en58163
+| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260217en.html#en58163
 }}{{unit info
 | Unit = 2

v t e 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.

v t e Emergency Notification System
Columbia with 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown
WEEKMONTHYEAR2026-02-12T10:49:00 [Table view]
[ENS list for Columbia]

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...
v • d • e