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An alert was declared due to a leak of sodium hypochlorite at the unit 2/3 cribhouse. Access to the unit 2/3 cribhouse, which is a vital area, was restricted. The leak has been isolated. The licensee has notified State authorities and the NRC Resident Inspector. The licensee stated that the sodium hypochlorite leak was actually outside the cribhouse and went into a sump. The fumes from the sodium hypochlorite restricted access to the cribhouse which contains safety related ultimate heat sink equipment (containment cooling service water pumps, emergency diesel generator cooling water pumps). Other than restricting access to the cribhouse, the leak has had no other impact on plant operation. The alert was declared under EAL H.A.7 - release of toxic gas within or restricting access to a vital area.

• * * UPDATE AT 1626 EDT ON 7/15/11 FROM MIROCHNA TO HUFFMAN * * *

The alert has been terminated on 7/15/11 at 1520 CDT. The conditions which caused the alert no longer exist. A press release was made for the event. Two employees were sent for offsite medical attention as a precautionary measure; neither employee was contaminated. The licensee stated that the sodium hypochlorite had leaked from a pipe into a sump under the storage trailer near the cribhouse. The sodium hypochlorite that leaked into the sump has been pumped out. Access to the cribhouse has been restored and there are no other access restrictions at the site. Both units continue to operate at full power. The licensee will notify appropriate state and local authorities. The NRC Resident Inspector has been notified. The licensee has also issued press releases concerning this event. R3DO (Bloomer), NRR EO (Giitter), IRD (Morris), DHS(Knox), and FEMA (Burckhart) have been notified.