WBI ENERGY TRANSMISSION, INC.

Incident Narrative

WBI ENERGY RECEIVED A CALL FROM A CONCERNED CITIZEN AT 4:41 PM ON 1/7/24 THAT THERE WAS A LOUD GAS BLOWING SOUND AT THE GOLVA COMPRESSOR STATION. A WBI OPERATOR ARRIVED ON SITE AT 5:14 PM AND ASSESSED THE SITUATION. THEY FOUND THE SUPPLY LINE TUBING FROM THE PILOT THAT HOLDS THE RELIEF VALVE CLOSED HAD FAILED WHICH CAUSED THE RELIEF VALVE TO OPEN AND VENT GAS TO THE ATMOSPHERE. THE OPERATOR WAS ABLE TO PARTIALLY ISOLATE THE STATION AND REPLACE THE BROKEN SUPPLY LINE TUBING. THE STATION WAS RETURNED TO NORMAL SERVICE AT 6:34 PM. THE VOLUME OF GAS RELEASED TO ATMOSPHERE WAS NOT CALCULATED ON THE DAY OF THE INCIDENT. A SIMILAR INCIDENT HAPPENED AT THE GOLVA COMPRESSOR STATION ON 1/23/24 AND WHEN SCADA DATA WAS BEING REVIEWED, THE VOLUME RELEASED ON 1/7/24 WAS IDENTIFIED AND CALCULATED. AFTER THE VOLUME WAS CALCULATED AND IDENTIFIED AS BEING OVER THE 3,000 MCF THRESHOLD, THE INCIDENT WAS TELEPHONED TO THE NRC. WBI PERFORMED AN INVESTIGATION OF THE SUPPLY LINE TUBING FAILURE THAT OCCURRED ON 1/7/24 AND 1/23/24. WBI'S VIBRATION TECHNICIAN TOOK VIBRATION INTENSITY READINGS ON THE RELIEF VALVE AND ASSOCIATED TUBING AND FOUND AMPLITUDES EXCEEDING ALLOWABLE LIMITS. WBI REPLACED THE SUPPLY LINE TUBING WITH HEAVIER WALL TUBING AND HAS DEVELOPED A PLAN FOR INSTALLING DIAGONAL SUPPORTS TO THE RELIEF VALVE AND ASSOCIATED PIPING. THE INSTALLATION OF THE ADDITIONAL SUPPORTS IS CURRENTLY BEING PLANNED AND TENTATIVELY SCHEDULED FOR THE FIRST WEEK IN MARCH. AFTER THE INSTALLATION OF THE SUPPORTS, ADDITIONAL VIBRATION ANALYSIS WILL BE PERFORMED TO CONFIRM THE VIBRATION HAS BEEN DAMPENED TO AN ALLOWABLE MAGNITUDE. UPDATE - INSTALLATION OF ADDITIONAL SUPPORTS WERE ADDED TO UNIT #1 ON 2/28 AND TO UNIT #2 ON 2/29.