TENNESSEE GAS PIPELINE COMPANY

Incident Narrative

AT 10:56 AM ON JANUARY 1, 2022, KM GAS CONTROL RECEIVED A STATION ALARM FROM STATION 325. TGP GAS CONTROL NOTIFIED DISTRICT PERSONNEL IMMEDIATELY AND THEY WERE DISPATCHED TO STATION 325. IMMEDIATELY AFTER RECEIVING THE ALARM, TGP GAS CONTROL RECEIVED CALLS FROM THREE NEIGHBORS LOCATED NEAR STATION 325 REPORTING LOUD SOUNDS COMING FROM THE STATION. UPON ARRIVAL AT STATION 325, DISTRICT PERSONNEL ENCOUNTERED THE LOCAL FIRE COMPANY AT THE MAIN GATE AND THE NJ STATE POLICE AT THE STATION YARD GATE. COMPANY PERSONNEL REQUESTED THAT THE FIRE COMPANY STAND-BY UNTIL GAS VENTING SUBSIDED AT WHICH POINT THE AREA WOULD BE SECURED. PERSONNEL COMPLETED A SITE EVALUATION AND DETERMINED UNIT 4A HAD GONE OFFLINE. WHEN UNIT 4A WENT OFFLINE THE COMPRESSOR CASE VENT OPENED AS DESIGNED BUT THE UNIT SUCTION AND DISCHARGE VALVES WERE UNABLE TO CLOSE DUE TO THE CPU FAILURE WHICH ALLOWED FOR THE UNINTENTIONAL RELEASE OF NATURAL GAS. THE INTERNAL EMERGENCY RESPONSE LINE (ERL) CALL NOTIFICATION WAS INITIATED PER COMPANY PROCEDURES TO DISCUSS THE INCIDENT. IT WAS DETERMINED ON THE CALL THAT THE QUANTITY OF GAS RELEASED WOULD MEET THE PHMSA-REPORTABLE THRESHOLD AND THE NRC WAS NOTIFIED. PERSONNEL MANUALLY CLOSED BOTH SUCTION AND DISCHARGE VALVES AT 12:10 PM AND VENTING CEASED. SOLAR WAS CONTACTED AND A SOLAR FIELD SERVICE REPRESENTATIVE (FSR) ARRIVED ON SITE AT APPROXIMATELY 5 PM TO BEGIN TROUBLESHOOTING UNIT 4A. THE SOLAR FSR WAS ABLE TO DETERMINE UNIT 4A SHUTDOWN WAS A RESULT OF A MAJOR PROCESSOR (CPU) FAILURE CAUSING A UNIT 'FAST STOP'. A NEW PROCESSOR WAS INSTALLED AND UNIT 4A STARTED NORMALLY AFTER GOING THROUGH ITS AUTOMATIC PRESTART CHECKS. UNIT 4A WAS RETURNED TO SERVICE ON SUNDAY EVENING, JANUARY 2, 2022, AFTER ADDITIONAL TESTING ENSURED NO OTHER ABNORMAL ISSUES WERE PRESENT.