ENS 52276: Difference between revisions

v t e ENS Event
17:08 Oct 3, 2016
Title	Loss of Secondary Containment Vacuum for Four Minutes
Event Description	On October 3, 2016, at 1008 PDT a Reactor Building Exhaust Valve (REA-V-1) unexpectedly closed, which caused the Technical Specification (TS) for secondary containment pressure boundary to not be met. The duration of time that the secondary containment TS was not met was approximately 4 minutes. Secondary containment differential pressure was restored within TS requirement of greater than or equal to 0.25 inches of vacuum water gauge at approximately 1012 PDT by manually starting Standby Gas Treatment (SGT) system (SYS) A. The cause of the REA-V-1 closure is currently under investigation. This condition is being reported under 10CFR50.72(b)(3)(v)(C) for an event or condition that could have prevented fulfillment of a safety function needed to control the release of radioactive material. The licensee has notified the NRC Resident Inspector.

ENS 52276 +/-
Where
Columbia Washington (NRC Region 4)
Reporting

10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material
Time - Person (Reporting Time:+-0.32 h-0.0133 days <br />-0.0019 weeks <br />-4.38336e-4 months <br />)
Opened:	Dan Sharpe 16:49 Oct 3, 2016
NRC Officer:	Mark Abramovitz
Last Updated:	Oct 3, 2016
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v • d • e

v t e Emergency Notification System
Columbia with 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material
WEEKMONTHYEAR2021-07-29T23:51:00 [Table view]
[ENS list for Columbia]

@@ Line 16: / Line 16: @@
 | event date = 10/03/2016 10:08 PDT
 | last update date = 10/03/2016
-| title = Loss Of Secondary Containment Vacuum For Four Minutes
+| title = Loss of Secondary Containment Vacuum for Four Minutes
 | event text = On October 3, 2016, at 1008 PDT a Reactor Building Exhaust Valve (REA-V-1) unexpectedly closed, which caused the Technical Specification (TS) for secondary containment pressure boundary to not be met. The duration of time that the secondary containment TS was not met was approximately 4 minutes.
 Secondary containment differential pressure was restored within TS requirement of greater than or equal to 0.25 inches of vacuum water gauge at approximately 1012 PDT by manually starting Standby Gas Treatment (SGT) system (SYS) A.  The cause of the REA-V-1 closure is currently under investigation.

Latest revision as of 20:44, 1 March 2018