On May 1, 2008, a Notice of Violation was issued for a Severity Level III violation. The violation involved the failure to assure safe and compliant activities involving nuclear material. Specifically, on November 17, 2006, a safety significant control interlock was willfully bypassed by an operator who disabled an alarm acknowledgement pushbutton associated with Conversion Line 5 while hydrogen gas was flowing to the calciner in the licensee's wet conversion process. This activity is prohibited by licensee procedures and NRC license conditions.