At 1605 EST on March 6, 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 on March 5, 2013. This event occurred while an employee was exiting
secondary containment. The inner door failed to latch and opened as the employee was opening the outer door. Upon recognition of the condition the employee 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 10 CFR 50.72(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.
Repairs to the secondary containment airlock door interlock have been completed.
This event did not result in any adverse impact to the health and safety of the public.
The NRC Senior Resident Inspector has been notified.
