On June 4, 2013, the NRC issued a Notice of Violation (NOV) associated with a Yellow Significance Determination Process (SDP) finding, a White SDP finding, and a Severity Level III violation to Tennessee Valley Authority (TVA). The Yellow finding, a violation of Technical Specification (TS) 5.7.1, Procedures, was issued for the failure of Watts Bar personnel to maintain an adequate procedure to implement its flood mitigation strategy within 27 hours as described in Watts Bar's Updated Final Safety Analysis Report (UFSAR) from initial licensing to July 2012. The White finding, a violation of TS 5.7.1, Procedures, was issued for the failure of Watts Bar personnel to establish and maintain an adequate procedure to implement its flood mitigation strategy prior to September 30, 2009, such that earthen dams located upstream of the facility could potentially overtop, causing a subsequent breach and resulting in onsite flooding and the submergence of critical equipment. The Severity Level III violation involved the failure of Watts Bar personnel to implement 10 CFR 50.72(b)(3)(ii)(B) on December 30, 2009, when Watts Bar personnel failed to notify the NRC within eight hours upon confirmation that a postulated Probable Maximum Flood (PMF) level would exceed the current licensing basis and the design basis PMF flooding event would result in overtopping of critical earthen dam structures upstream of the Watts Bar facility.