TRANSCONTINENTAL GAS PIPE LINE COMPANY

Incident Narrative

PLEASE REFERENCE THE ORIGINAL REPORT NO. 20180084-30821 FOR THE INITIAL INCIDENT REPORT INFORMATION. A BRIEF SUMMARY IS NOTED BELOW. ON JULY 2, 2018 AT APPROXIMATELY 10:00 PM (22:00), OPERATION TECHNICIAN WAS CALLED OUT TO STATION 140 ON REPORT OF MAIN UNITS (MUS) 14 AND 15 FALLING OFFLINE. UPON ARRIVAL AT APPROXIMATELY 10:30 PM (22:30), TECHNICIAN REVIEWED ALARM LOGS IN CONTROL ROOM, AND INSPECTED MUS 14 AND 15, AND IDENTIFIED A CRACK ON THE MU 14 DISCHARGE HEADER AT THE 4' BLOWDOWN PIPING CONNECTION. IDENTIFIED AT APPROXIMATELY 11:43 PM (23:43). OPERATION TECHNICIAN CONTACTED OPERATIONS MANAGER TO NOTIFY OF LEAK, CONTACTED PIPELINE CONTROL, AND CONTACTED ADDITIONAL TECHNICIANS TO COME HELP ISOLATE AND BLOWDOWN MU 14 PIPING. UPON ARRIVAL OF BACKUP SUPPORT, PROCEEDED TO ISOLATE MU 14 AND PERFORM REMOTE ESD OF MU 14 PIPING. (APPROXIMATELY 1:45AM (01:45) ON JULY 3) REPAIR OPTIONS WERE DETERMINED TO EXCEED $50,000 ON JULY 19, 2018 AND SECURITY OPERATIONS CENTER (SOC) WAS INSTRUCTED TO CONTACT THE NRC FOR A DOT REPORTABLE INCIDENT. THE FIRST INITIAL NRC REPORT# 1218827 ON JULY 19 WAS IN ERROR (REPORTED INCIDENT AS 'FIXED'). PHMSA REQUESTED TO CORRECT THE REPORT TO INCIDENT AS 'PIPELINE' UNDER NRC REPORT# 1218832. A 48-HOUR UPDATE WAS SUBMITTED UNDER NRC REPORT# 1219242 ON JULY 23, 2018. ON AUGUST 21, 2018, PHMSA REQUESTED CORRECTIONS TO THE INITIAL INCIDENT REPORT AND ARE REFLECTED ON THIS FINAL INCIDENT REPORT. A STATION OUTAGE WAS REQUIRED TO REPAIR THE DISCHARGE HEADER AND SAFELY INSTALL THE NEW REPLACEMENT TEE. THE REPAIR WAS COMPLETED, AND MU 14 WAS RETURNED TO SERVICE ON SEPTEMBER 6, 2018 AT APPROXIMATELY 9:00 PM EST (21:00). THE FINAL INFORMATION WAS GATHERED AND VERIFIED, AND THIS FINAL INCIDENT REPORT WAS SUBMITTED ON DECEMBER 13, 2018