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| Entered date | Event description | |
|---|---|---|
| ENS 49910 | 13 March 2014 14:12:00 | At 0937 EDT on March 13, 2014, Operations determined that both the inner and outer secondary containment airlock doors, on the 50 foot elevation of the reactor building, had been simultaneously opened for approximately one minute. This event occurred while an employee was exiting secondary containment at the same time when an employee was attempting to enter secondary containment. Upon recognition of the condition, the employees took action to secure both doors. The apparent cause of this event was malfunction of the secondary containment airlock door interlock. However, upon investigation no failures of the interlock could be identified. The interlock was satisfactorily tested multiple times following the event. 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 one minute. This event did not result in any adverse impact to the health and safety of the public. The door interlock was investigated and tested multiple times with no abnormalities noted. The NRC Senior Resident has been notified. The licensee is establishing a door watch as a compensatory measure. |