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This is a report of a loss of emergency assessment capability as required by 10CFR50.72(b)(3)(xiii). On October 7, 2013 at 1804 CDT, with Unit 1 in Mode 6 during a refueling outage, power was interrupted to all Unit 1 vent stack radiation monitors and area radiation monitors as part of a pre-planned activity to connect the radiation monitors to an alternate temporary power supply to support deenergizing the normal power source for preventative maintenance. The connection to the alternate supply was completed and power was restored to the vent stack radiation monitors and area radiation monitors at 1833 CDT. While the radiation monitors were without power, pre-planned compensatory measures were implemented where possible to monitor vent stack discharge and to minimize activities that posed a potential for release. At the completion of the preventive maintenance on the normal power supply, power to the vent stack radiation monitors and area radiation monitor will again be briefly interrupted to reconnect the normal power source to the monitors. The pre-planned compensatory measures will again be utilized during this power interruption. An update to this report will be provided following the restoration of normal power to the radiation monitors. The NRC Resident Inspector has been informed.

• * * UPDATE FROM DARRIN GARD TO JOHN SHOEMAKER AT 0419 EDT ON 10/13/13 * * *

On October 13, 2013 at 0217 CDT, with Unit 1 in defueled mode during a refueling outage, power was interrupted to all Unit 1 vent stack radiation monitors and area radiation monitors as part of a pre-planned activity to transfer the radiation monitors back to their normal power supply. The connection to the normal supply was completed and power was restored to the vent stack radiation monitors and area radiation monitors at 0245 CDT. Pre-planned compensatory measures were implemented where possible to monitor vent stack discharge and to minimize activities that posed a potential for release. Notified R2DO (Widmann) and the licensee will notify the NRC Resident Inspector.