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At 1410 CDT, Grand Gulf declared an Unusual Event for EAL H.U.5, release of toxic and flammable gases adverse to normal operation of the plant. CO2 was discharged in the electrical switchgear room in the auxiliary building. No injuries or fatalities were found after an initial search of the area. The cause of the CO2 discharge is under investigation. The NRC Resident Inspector was notified. Notified DHS SWO, FEMA, DHS NICC, and Nuclear SSA via email.

• * * UPDATE ON 1748 EDT AT 6/19/2013 FROM RUSSELL BURDITT TO DONG PARK * * *

All areas of the auxiliary building have been verified to have no oxygen deficiency." The Unusual Event was terminated at 1628 CDT. The NRC Resident Inspector was notified. Notified R4DO (Walker), NRR EO (Giitter), and IRD (Marshall). Notified DHS SWO, FEMA, DHS NICC, and Nuclear SSA via email.