DTE GAS COMPANY

Incident Narrative

AT 2:41 AM 1/02/2022 THE STATION SUPERVISOR RECEIVED A CALL FROM THE OPERATOR ON SHIFT LETTING ME KNOW WHAT HE WAS SMELLING AND IDENTIFIED A GAS LEAK IN THE BUILDING AND WAS GOING TO INITIATE AN ESD. GAS CONTROL WAS CALLED BY THE OPERATOR AND NOTIFIED THE CONTROLLER ON SHIFT OF THE CURRENT STATE OF THE PLANT. AT 2:45 AM THE ESD WAS INITIATED. THEN, AT 2:49 AM THE SUPERVISOR CALLED THE STATION MANAGER TO LET HIM KNOW THE SITUATION OF THE PLANT. AT 3:21 AM THE SUPERVISOR CALLED THE MANAGER OF CODES ABOUT THE UNPLANNED ESD EVENT. CODES & STANDARD MANAGER CONTACTED THE MPSC AT 3:25 AM. AT 4:27 AM THE SUPERVISOR CALLED GAS CONTROL AGAIN TO MAKE SURE THEY ARE AWARE OF THE STATE OF THE PLANT. THE OPERATOR ON SHIFT CALLED THE SUPERVISOR AT 4:30 AM AND NOTIFIED ME THAT GAS WAS STILL VENTING AT PLANT 2 AND HE CALLED IN TECHNICIANS IN TO HELP. AT 5:05 AM THE FIRST TECHNICIAN ARRIVED ONSITE TO HELP WITH THE SITUATION. THE STATION MANAGER AND SUPERVISOR ARRIVED ONSITE AT 5:20 AM. WHILE ONSITE IT WAS IDENTIFIED THAT SUCTION 1 PLANT 2 ESD VALVE AND DISCHARGE 2 PLANT 2 ESD VALVE FAILED TO CLOSE, WHICH RESULTED IN OPERATIONS RECONFIGURING THE PLANT TO ISOLATE THE CONTINUED VENTING ASSOCIATED WITH THE SUCTION 1 ESD ISOLATION VALVE NOT CLOSING. AFTER THE PLANT WAS RECONFIGURED, GAS STOPPED VENTING AT 5:35 AM. THE STATION MANAGEMENT CONTACTED CODES TO LET THEM KNOW THAT WE VENTED APPROXIMATELY 35.5 MMCF OF GAS DUE TO THE UNANTICIPATED VALVE OPERATION. THE CODES & STANDARDS SUPERVISOR CONTACTED THE NRC AT 6:10 AM.