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Entered an Unusual Event (under Emergency Action Level) MU1, toxic gas, carbon monoxide (CO), detected in the Radwaste Control Room. Levels rose to 34 ppm and the Radwaste Control Room was evacuated prior to reaching the First Energy exposure limit of 35 ppm. The source of the CO has not been determined. There is no radiation release from this event. There were no personnel injuries and offsite assistance was not requested. There was no effect on plant operations. The licensee has notified state and local authorities and the NRC Resident Inspector. Notified DHS SWO, FEMA, DHS NICC and NuclearSSA via email.

• * * UPDATE AT 1504 EST ON 11/28/12 FROM MARIKIO BLOUNT TO HUFFMAN * * *

(At 1452 EST, the licensee) terminated the Unusual Event for MU1, due to toxic gas - carbon monoxide, detected in the Radwaste Control Room.  The source of the carbon monoxide readings was determined to be from a leaking acetylene bottle.  The acetylene bottle has been removed from the building.  Carbon monoxide readings have returned to normal.

The licensee noted that the acetylene is detected as carbon monoxide by the toxic gas monitoring devices. The licensee has notified State and local authorities and the NRC Resident Inspector. Notified R3DO (Stone), NRR (EO) Lubinski) , IRD (Marshall), DHS SWO, FEMA, DHS NICC and NuclearSSA via email.