TMI new river analysis indicates level above existing
UFSAR [Updated Final Safety Analysis Report] flood analysis. At about 15:00 [EDT] on September 26, 2011, a revised River Stage Discharge Analysis was completed and concluded that the Probable Maximum Flood (
PMF) water level is higher than previously described in the safety analysis report. This
unanalyzed condition is reportable in accordance with
10 CFR 50.72(b)(3)(ii)(B).
Actions to protect the plant for the higher PMF river level have been implemented. The flood barrier gates that protect safety related equipment have been modified to accommodate the revised river levels. No onsite flood water levels have occurred that could potentially challenge the existing flood barrier system.
The licensee notified the NRC Resident Inspector.
The licensee will be making a courtesy media notification.
