This is a non-emergency report. No actual event has occurred.
At 2006 EDT, on 9/5/2012, Oconee Nuclear Station Operations declared the radiation monitors out of service for Low Gas Unit Vent monitoring (3RIA-45) and High Gas Unit monitoring (3RIA-46) when the Unit 3 Vent Skid lost its internal memory during a monthly PM to replace the filter cartridge. These monitors are used for determination of Emergency Action Levels (EALs) in ALL modes.
Oconee Nuclear Station did not initially recognize that criteria for reporting in accordance with 10 CFR 50.72 (b)(3)(xiii) (Major Loss of Emergency Preparedness Capabilities) was met and acknowledge this notification is outside of the eight (8) hour notification window.
There is no adverse impact on nuclear safety. Redundant methods for sampling and determination of activity levels were implemented per SLC 16.11.3.
This report is submitted based upon a loss of emergency assessment capability in accordance with 50.72(b)(3)(xiii).
Redundant methodology was employed [when the inoperable status was recognized].
Repair and restoration of the effected radiation monitors was completed at 2145 on 9/6/2012.
The NRC Resident Inspector has been informed.
