ENS 49921
ENS Event | |
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11:50 Mar 17, 2014 | |
Title | Secondary Containment Airlock Door Interlock Malfunction |
Event Description | At 0750 EDT on March 17, 2014, Operations determined that both the inner and outer secondary containment airlock doors, on the 20 foot elevation of the Unit 1 reactor building, had been simultaneously opened for approximately 10 seconds. This event occurred while an employee was exiting secondary containment immediately after another employee had previously entered. Upon recognition of the condition, the employees took action to secure both doors. The cause of this event was malfunction of the secondary containment airlock door interlock.
This condition is being reported in accordance with 10CFR50.72(b)(3)(v)(C), event or condition that could have prevented fulfillment of a safety function needed to control the release of radioactive material. With both doors open, Surveillance Requirement 3.6.4.1.3 of Technical Specification 3.6.4.1, Secondary Containment, was not met, rendering secondary containment inoperable. At the time at the time of the condition, Unit 1 was engaged in Operations with the Potential to Drain the Reactor Vessel (OPDRV) and was crediting Secondary Containment as Operable. This event did not result in any adverse impact to the health and safety of the public. The safety significance of this is minimal. Secondary containment was only inoperable for approximately 10 seconds. This event did not result in any adverse impact to the health and safety of the public. The door interlock investigation [is] in progress. Doorwatches with communications have been stationed on either side of the Unit 1 and Unit 2 20 foot reactor building air lock doors. All other secondary containment access doors on both Reactor Building have been controlled as emergency exit only. Installation of temporary video surveillance system [is] being pursued until long term corrective action can be established per the corrective action program. The NRC Senior Resident has been notified. |
Where | |
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Brunswick North Carolina (NRC Region 2) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |
Time - Person (Reporting Time:+-0.4 h-0.0167 days <br />-0.00238 weeks <br />-5.4792e-4 months <br />) | |
Opened: | Mark R. Dewire 11:26 Mar 17, 2014 |
NRC Officer: | Steve Sandin |
Last Updated: | Mar 17, 2014 |
49921 - NRC Website | |
WEEKMONTHYEARENS 528882017-08-04T19:11:0004 August 2017 19:11:00
[Table view]10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Inoperable Due to Opening in Service Water Piping ENS 500462014-04-20T06:15:00020 April 2014 06:15:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Loss of Secondary Containment Due to Opening in Reactor Building Roof Drain Piping ENS 499212014-03-17T11:50:00017 March 2014 11:50:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Airlock Door Interlock Malfunction ENS 499102014-03-13T13:37:00013 March 2014 13:37:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Apparent Secondary Containment Airlock Door Interlock Malfunction ENS 498802014-03-06T21:05:0006 March 2014 21:05:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Airlock Door Interlock Malfunction 2017-08-04T19:11:00 | |